Darren Tucker | 1338b9e | 2011-10-02 18:57:35 +1100 | [diff] [blame^] | 1 | /* $OpenBSD: channels.c,v 1.314 2011/09/23 00:22:04 dtucker Exp $ */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 5 | * All rights reserved |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 6 | * This file contains functions for generic socket connection forwarding. |
| 7 | * There is also code for initiating connection forwarding for X11 connections, |
| 8 | * arbitrary tcp/ip connections, and the authentication agent connection. |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 9 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 10 | * As far as I am concerned, the code I have written for this software |
| 11 | * can be used freely for any purpose. Any derived versions of this |
| 12 | * software must be clearly marked as such, and if the derived work is |
| 13 | * incompatible with the protocol description in the RFC file, it must be |
| 14 | * called by a name other than "ssh" or "Secure Shell". |
| 15 | * |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 16 | * SSH2 support added by Markus Friedl. |
Damien Miller | a90fc08 | 2002-01-22 23:19:38 +1100 | [diff] [blame] | 17 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 18 | * Copyright (c) 1999 Dug Song. All rights reserved. |
| 19 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. |
| 20 | * |
| 21 | * Redistribution and use in source and binary forms, with or without |
| 22 | * modification, are permitted provided that the following conditions |
| 23 | * are met: |
| 24 | * 1. Redistributions of source code must retain the above copyright |
| 25 | * notice, this list of conditions and the following disclaimer. |
| 26 | * 2. Redistributions in binary form must reproduce the above copyright |
| 27 | * notice, this list of conditions and the following disclaimer in the |
| 28 | * documentation and/or other materials provided with the distribution. |
| 29 | * |
| 30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 40 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 41 | |
| 42 | #include "includes.h" |
Damien Miller | 17e91c0 | 2006-03-15 11:28:34 +1100 | [diff] [blame] | 43 | |
Damien Miller | 574c41f | 2006-03-15 11:40:10 +1100 | [diff] [blame] | 44 | #include <sys/types.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 45 | #include <sys/ioctl.h> |
Damien Miller | 574c41f | 2006-03-15 11:40:10 +1100 | [diff] [blame] | 46 | #include <sys/un.h> |
Damien Miller | efc04e7 | 2006-07-10 20:26:27 +1000 | [diff] [blame] | 47 | #include <sys/socket.h> |
Damien Miller | 9aec919 | 2006-08-05 10:57:45 +1000 | [diff] [blame] | 48 | #ifdef HAVE_SYS_TIME_H |
| 49 | # include <sys/time.h> |
| 50 | #endif |
Damien Miller | efc04e7 | 2006-07-10 20:26:27 +1000 | [diff] [blame] | 51 | |
| 52 | #include <netinet/in.h> |
| 53 | #include <arpa/inet.h> |
Damien Miller | 99bd21e | 2006-03-15 11:11:28 +1100 | [diff] [blame] | 54 | |
Darren Tucker | 3997249 | 2006-07-12 22:22:46 +1000 | [diff] [blame] | 55 | #include <errno.h> |
Darren Tucker | 6e7fe1c | 2010-01-08 17:07:22 +1100 | [diff] [blame] | 56 | #include <fcntl.h> |
Damien Miller | b8fe89c | 2006-07-24 14:51:00 +1000 | [diff] [blame] | 57 | #include <netdb.h> |
Damien Miller | a7a73ee | 2006-08-05 11:37:59 +1000 | [diff] [blame] | 58 | #include <stdio.h> |
Damien Miller | e7a1e5c | 2006-08-05 11:34:19 +1000 | [diff] [blame] | 59 | #include <stdlib.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 60 | #include <string.h> |
Damien Miller | 99bd21e | 2006-03-15 11:11:28 +1100 | [diff] [blame] | 61 | #include <termios.h> |
Damien Miller | e6b3b61 | 2006-07-24 14:01:23 +1000 | [diff] [blame] | 62 | #include <unistd.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 63 | #include <stdarg.h> |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 64 | |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 65 | #include "openbsd-compat/sys-queue.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 66 | #include "xmalloc.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 67 | #include "ssh.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 68 | #include "ssh1.h" |
| 69 | #include "ssh2.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 70 | #include "packet.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 71 | #include "log.h" |
| 72 | #include "misc.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 73 | #include "buffer.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 74 | #include "channels.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 75 | #include "compat.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 76 | #include "canohost.h" |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 77 | #include "key.h" |
| 78 | #include "authfd.h" |
Damien Miller | 3afe375 | 2001-12-21 12:39:51 +1100 | [diff] [blame] | 79 | #include "pathnames.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 80 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 81 | /* -- channel core */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 82 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 83 | /* |
| 84 | * Pointer to an array containing all allocated channels. The array is |
| 85 | * dynamically extended as needed. |
| 86 | */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 87 | static Channel **channels = NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 88 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 89 | /* |
| 90 | * Size of the channel array. All slots of the array must always be |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 91 | * initialized (at least the type field); unused slots set to NULL |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 92 | */ |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 93 | static u_int channels_alloc = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 94 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 95 | /* |
| 96 | * Maximum file descriptor value used in any of the channels. This is |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 97 | * updated in channel_new. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 98 | */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 99 | static int channel_max_fd = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 100 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 101 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 102 | /* -- tcp forwarding */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 103 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 104 | /* |
| 105 | * Data structure for storing which hosts are permitted for forward requests. |
| 106 | * The local sides of any remote forwards are stored in this array to prevent |
| 107 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local |
| 108 | * network (which might be behind a firewall). |
| 109 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 110 | typedef struct { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 111 | char *host_to_connect; /* Connect to 'host'. */ |
| 112 | u_short port_to_connect; /* Connect to 'port'. */ |
| 113 | u_short listen_port; /* Remote side should listen port number. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 114 | } ForwardPermission; |
| 115 | |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 116 | /* List of all permitted host/port pairs to connect by the user. */ |
Damien Miller | 232cfb1 | 2010-06-26 09:50:30 +1000 | [diff] [blame] | 117 | static ForwardPermission *permitted_opens = NULL; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 118 | |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 119 | /* List of all permitted host/port pairs to connect by the admin. */ |
Damien Miller | 232cfb1 | 2010-06-26 09:50:30 +1000 | [diff] [blame] | 120 | static ForwardPermission *permitted_adm_opens = NULL; |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 121 | |
| 122 | /* Number of permitted host/port pairs in the array permitted by the user. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 123 | static int num_permitted_opens = 0; |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 124 | |
| 125 | /* Number of permitted host/port pair in the array permitted by the admin. */ |
| 126 | static int num_adm_permitted_opens = 0; |
| 127 | |
Darren Tucker | 1338b9e | 2011-10-02 18:57:35 +1100 | [diff] [blame^] | 128 | /* special-case port number meaning allow any port */ |
| 129 | #define FWD_PERMIT_ANY_PORT 0 |
| 130 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 131 | /* |
| 132 | * If this is true, all opens are permitted. This is the case on the server |
| 133 | * on which we have to trust the client anyway, and the user could do |
| 134 | * anything after logging in anyway. |
| 135 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 136 | static int all_opens_permitted = 0; |
| 137 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 138 | |
| 139 | /* -- X11 forwarding */ |
| 140 | |
| 141 | /* Maximum number of fake X11 displays to try. */ |
| 142 | #define MAX_DISPLAYS 1000 |
| 143 | |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 144 | /* Saved X11 local (client) display. */ |
| 145 | static char *x11_saved_display = NULL; |
| 146 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 147 | /* Saved X11 authentication protocol name. */ |
| 148 | static char *x11_saved_proto = NULL; |
| 149 | |
| 150 | /* Saved X11 authentication data. This is the real data. */ |
| 151 | static char *x11_saved_data = NULL; |
| 152 | static u_int x11_saved_data_len = 0; |
| 153 | |
| 154 | /* |
| 155 | * Fake X11 authentication data. This is what the server will be sending us; |
| 156 | * we should replace any occurrences of this by the real data. |
| 157 | */ |
Damien Miller | 4ae97f1 | 2006-03-26 14:08:10 +1100 | [diff] [blame] | 158 | static u_char *x11_fake_data = NULL; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 159 | static u_int x11_fake_data_len; |
| 160 | |
| 161 | |
| 162 | /* -- agent forwarding */ |
| 163 | |
| 164 | #define NUM_SOCKS 10 |
| 165 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 166 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
Ben Lindstrom | 908afed | 2001-10-03 17:34:59 +0000 | [diff] [blame] | 167 | static int IPv4or6 = AF_UNSPEC; |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 168 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 169 | /* helper */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 170 | static void port_open_helper(Channel *c, char *rtype); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 171 | |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 172 | /* non-blocking connect helpers */ |
| 173 | static int connect_next(struct channel_connect *); |
| 174 | static void channel_connect_ctx_free(struct channel_connect *); |
| 175 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 176 | /* -- channel core */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 177 | |
| 178 | Channel * |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 179 | channel_by_id(int id) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 180 | { |
| 181 | Channel *c; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 182 | |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 183 | if (id < 0 || (u_int)id >= channels_alloc) { |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 184 | logit("channel_by_id: %d: bad id", id); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 185 | return NULL; |
| 186 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 187 | c = channels[id]; |
| 188 | if (c == NULL) { |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 189 | logit("channel_by_id: %d: bad id: channel free", id); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 190 | return NULL; |
| 191 | } |
| 192 | return c; |
| 193 | } |
| 194 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 195 | /* |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 196 | * Returns the channel if it is allowed to receive protocol messages. |
| 197 | * Private channels, like listening sockets, may not receive messages. |
| 198 | */ |
| 199 | Channel * |
| 200 | channel_lookup(int id) |
| 201 | { |
| 202 | Channel *c; |
| 203 | |
| 204 | if ((c = channel_by_id(id)) == NULL) |
| 205 | return (NULL); |
| 206 | |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 207 | switch (c->type) { |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 208 | case SSH_CHANNEL_X11_OPEN: |
| 209 | case SSH_CHANNEL_LARVAL: |
| 210 | case SSH_CHANNEL_CONNECTING: |
| 211 | case SSH_CHANNEL_DYNAMIC: |
| 212 | case SSH_CHANNEL_OPENING: |
| 213 | case SSH_CHANNEL_OPEN: |
| 214 | case SSH_CHANNEL_INPUT_DRAINING: |
| 215 | case SSH_CHANNEL_OUTPUT_DRAINING: |
| 216 | return (c); |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 217 | } |
| 218 | logit("Non-public channel %d, type %d.", id, c->type); |
| 219 | return (NULL); |
| 220 | } |
| 221 | |
| 222 | /* |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 223 | * Register filedescriptors for a channel, used when allocating a channel or |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 224 | * when the channel consumer/producer is ready, e.g. shell exec'd |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 225 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 226 | static void |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 227 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
Darren Tucker | ed3cdc0 | 2008-06-16 23:29:18 +1000 | [diff] [blame] | 228 | int extusage, int nonblock, int is_tty) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 229 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 230 | /* Update the maximum file descriptor value. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 231 | channel_max_fd = MAX(channel_max_fd, rfd); |
| 232 | channel_max_fd = MAX(channel_max_fd, wfd); |
| 233 | channel_max_fd = MAX(channel_max_fd, efd); |
| 234 | |
Darren Tucker | 6e7fe1c | 2010-01-08 17:07:22 +1100 | [diff] [blame] | 235 | if (rfd != -1) |
| 236 | fcntl(rfd, F_SETFD, FD_CLOEXEC); |
| 237 | if (wfd != -1 && wfd != rfd) |
| 238 | fcntl(wfd, F_SETFD, FD_CLOEXEC); |
| 239 | if (efd != -1 && efd != rfd && efd != wfd) |
| 240 | fcntl(efd, F_SETFD, FD_CLOEXEC); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 241 | |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 242 | c->rfd = rfd; |
| 243 | c->wfd = wfd; |
| 244 | c->sock = (rfd == wfd) ? rfd : -1; |
| 245 | c->efd = efd; |
| 246 | c->extended_usage = extusage; |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 247 | |
Darren Tucker | ed3cdc0 | 2008-06-16 23:29:18 +1000 | [diff] [blame] | 248 | if ((c->isatty = is_tty) != 0) |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 249 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
Darren Tucker | 1a48aec | 2008-06-16 23:35:56 +1000 | [diff] [blame] | 250 | c->wfd_isatty = is_tty || isatty(c->wfd); |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 251 | |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 252 | /* enable nonblocking mode */ |
| 253 | if (nonblock) { |
| 254 | if (rfd != -1) |
| 255 | set_nonblock(rfd); |
| 256 | if (wfd != -1) |
| 257 | set_nonblock(wfd); |
| 258 | if (efd != -1) |
| 259 | set_nonblock(efd); |
| 260 | } |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 261 | } |
| 262 | |
| 263 | /* |
| 264 | * Allocate a new channel object and set its type and socket. This will cause |
| 265 | * remote_name to be freed. |
| 266 | */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 267 | Channel * |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 268 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
Ben Lindstrom | 4fed2be | 2002-06-25 23:17:36 +0000 | [diff] [blame] | 269 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 270 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 271 | int found; |
| 272 | u_int i; |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 273 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 274 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 275 | /* Do initial allocation if this is the first call. */ |
| 276 | if (channels_alloc == 0) { |
| 277 | channels_alloc = 10; |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 278 | channels = xcalloc(channels_alloc, sizeof(Channel *)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 279 | for (i = 0; i < channels_alloc; i++) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 280 | channels[i] = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 281 | } |
| 282 | /* Try to find a free slot where to put the new channel. */ |
| 283 | for (found = -1, i = 0; i < channels_alloc; i++) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 284 | if (channels[i] == NULL) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 285 | /* Found a free slot. */ |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 286 | found = (int)i; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 287 | break; |
| 288 | } |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 289 | if (found < 0) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 290 | /* 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] | 291 | found = channels_alloc; |
Damien Miller | 9403aa2 | 2002-06-26 19:14:43 +1000 | [diff] [blame] | 292 | if (channels_alloc > 10000) |
| 293 | fatal("channel_new: internal error: channels_alloc %d " |
| 294 | "too big.", channels_alloc); |
Damien Miller | 3681209 | 2006-03-26 14:22:47 +1100 | [diff] [blame] | 295 | channels = xrealloc(channels, channels_alloc + 10, |
| 296 | sizeof(Channel *)); |
Damien Miller | 5efcecc | 2003-09-17 07:31:14 +1000 | [diff] [blame] | 297 | channels_alloc += 10; |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 298 | debug2("channel: expanding %d", channels_alloc); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 299 | for (i = found; i < channels_alloc; i++) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 300 | channels[i] = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 301 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 302 | /* Initialize and return new channel. */ |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 303 | c = channels[found] = xcalloc(1, sizeof(Channel)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 304 | buffer_init(&c->input); |
| 305 | buffer_init(&c->output); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 306 | buffer_init(&c->extended); |
Damien Miller | a1c1b6c | 2009-01-28 16:29:49 +1100 | [diff] [blame] | 307 | c->path = NULL; |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 308 | c->listening_addr = NULL; |
| 309 | c->listening_port = 0; |
Damien Miller | 5144df9 | 2002-01-22 23:28:45 +1100 | [diff] [blame] | 310 | c->ostate = CHAN_OUTPUT_OPEN; |
| 311 | c->istate = CHAN_INPUT_OPEN; |
| 312 | c->flags = 0; |
Damien Miller | d310d51 | 2008-06-16 07:59:23 +1000 | [diff] [blame] | 313 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, 0); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 314 | c->self = found; |
| 315 | c->type = type; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 316 | c->ctype = ctype; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 317 | c->local_window = window; |
| 318 | c->local_window_max = window; |
| 319 | c->local_consumed = 0; |
| 320 | c->local_maxpacket = maxpack; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 321 | c->remote_id = -1; |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 322 | c->remote_name = xstrdup(remote_name); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 323 | c->remote_window = 0; |
| 324 | c->remote_maxpacket = 0; |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 325 | c->force_drain = 0; |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 326 | c->single_connection = 0; |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 327 | c->detach_user = NULL; |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 328 | c->detach_close = 0; |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 329 | c->open_confirm = NULL; |
| 330 | c->open_confirm_ctx = NULL; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 331 | c->input_filter = NULL; |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 332 | c->output_filter = NULL; |
Darren Tucker | 84c56f5 | 2008-06-13 04:55:46 +1000 | [diff] [blame] | 333 | c->filter_ctx = NULL; |
| 334 | c->filter_cleanup = NULL; |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 335 | c->ctl_chan = -1; |
| 336 | c->mux_rcb = NULL; |
| 337 | c->mux_ctx = NULL; |
Damien Miller | d530f5f | 2010-05-21 14:57:10 +1000 | [diff] [blame] | 338 | c->mux_pause = 0; |
Darren Tucker | 876045b | 2010-01-08 17:08:00 +1100 | [diff] [blame] | 339 | c->delayed = 1; /* prevent call to channel_post handler */ |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 340 | TAILQ_INIT(&c->status_confirms); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 341 | debug("channel %d: new [%s]", found, remote_name); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 342 | return c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 343 | } |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 344 | |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 345 | static int |
| 346 | channel_find_maxfd(void) |
| 347 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 348 | u_int i; |
| 349 | int max = 0; |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 350 | Channel *c; |
| 351 | |
| 352 | for (i = 0; i < channels_alloc; i++) { |
| 353 | c = channels[i]; |
| 354 | if (c != NULL) { |
| 355 | max = MAX(max, c->rfd); |
| 356 | max = MAX(max, c->wfd); |
| 357 | max = MAX(max, c->efd); |
| 358 | } |
| 359 | } |
| 360 | return max; |
| 361 | } |
| 362 | |
| 363 | int |
| 364 | channel_close_fd(int *fdp) |
| 365 | { |
| 366 | int ret = 0, fd = *fdp; |
| 367 | |
| 368 | if (fd != -1) { |
| 369 | ret = close(fd); |
| 370 | *fdp = -1; |
| 371 | if (fd == channel_max_fd) |
| 372 | channel_max_fd = channel_find_maxfd(); |
| 373 | } |
| 374 | return ret; |
| 375 | } |
| 376 | |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 377 | /* Close all channel fd/socket. */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 378 | static void |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 379 | channel_close_fds(Channel *c) |
| 380 | { |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 381 | channel_close_fd(&c->sock); |
| 382 | channel_close_fd(&c->rfd); |
| 383 | channel_close_fd(&c->wfd); |
| 384 | channel_close_fd(&c->efd); |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 385 | } |
| 386 | |
| 387 | /* Free the channel and close its fd/socket. */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 388 | void |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 389 | channel_free(Channel *c) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 390 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 391 | char *s; |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 392 | u_int i, n; |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 393 | struct channel_confirm *cc; |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 394 | |
| 395 | for (n = 0, i = 0; i < channels_alloc; i++) |
| 396 | if (channels[i]) |
| 397 | n++; |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 398 | debug("channel %d: free: %s, nchannels %u", c->self, |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 399 | c->remote_name ? c->remote_name : "???", n); |
Ben Lindstrom | 6c3ae2b | 2000-12-30 03:25:14 +0000 | [diff] [blame] | 400 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 401 | s = channel_open_message(); |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 402 | debug3("channel %d: status: %s", c->self, s); |
Ben Lindstrom | 6c3ae2b | 2000-12-30 03:25:14 +0000 | [diff] [blame] | 403 | xfree(s); |
| 404 | |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 405 | if (c->sock != -1) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 406 | shutdown(c->sock, SHUT_RDWR); |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 407 | channel_close_fds(c); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 408 | buffer_free(&c->input); |
| 409 | buffer_free(&c->output); |
| 410 | buffer_free(&c->extended); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 411 | if (c->remote_name) { |
| 412 | xfree(c->remote_name); |
| 413 | c->remote_name = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 414 | } |
Damien Miller | a1c1b6c | 2009-01-28 16:29:49 +1100 | [diff] [blame] | 415 | if (c->path) { |
| 416 | xfree(c->path); |
| 417 | c->path = NULL; |
| 418 | } |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 419 | if (c->listening_addr) { |
| 420 | xfree(c->listening_addr); |
| 421 | c->listening_addr = NULL; |
| 422 | } |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 423 | while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) { |
| 424 | if (cc->abandon_cb != NULL) |
| 425 | cc->abandon_cb(c, cc->ctx); |
| 426 | TAILQ_REMOVE(&c->status_confirms, cc, entry); |
| 427 | bzero(cc, sizeof(*cc)); |
| 428 | xfree(cc); |
| 429 | } |
Darren Tucker | 84c56f5 | 2008-06-13 04:55:46 +1000 | [diff] [blame] | 430 | if (c->filter_cleanup != NULL && c->filter_ctx != NULL) |
| 431 | c->filter_cleanup(c->self, c->filter_ctx); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 432 | channels[c->self] = NULL; |
| 433 | xfree(c); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 434 | } |
| 435 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 436 | void |
Ben Lindstrom | 601e436 | 2001-06-21 03:19:23 +0000 | [diff] [blame] | 437 | channel_free_all(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 438 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 439 | u_int i; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 440 | |
Ben Lindstrom | 601e436 | 2001-06-21 03:19:23 +0000 | [diff] [blame] | 441 | for (i = 0; i < channels_alloc; i++) |
| 442 | if (channels[i] != NULL) |
| 443 | channel_free(channels[i]); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 444 | } |
| 445 | |
| 446 | /* |
| 447 | * Closes the sockets/fds of all channels. This is used to close extra file |
| 448 | * descriptors after a fork. |
| 449 | */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 450 | void |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 451 | channel_close_all(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 452 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 453 | u_int i; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 454 | |
| 455 | for (i = 0; i < channels_alloc; i++) |
| 456 | if (channels[i] != NULL) |
| 457 | channel_close_fds(channels[i]); |
| 458 | } |
| 459 | |
| 460 | /* |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 461 | * Stop listening to channels. |
| 462 | */ |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 463 | void |
| 464 | channel_stop_listening(void) |
| 465 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 466 | u_int i; |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 467 | Channel *c; |
| 468 | |
| 469 | for (i = 0; i < channels_alloc; i++) { |
| 470 | c = channels[i]; |
| 471 | if (c != NULL) { |
| 472 | switch (c->type) { |
| 473 | case SSH_CHANNEL_AUTH_SOCKET: |
| 474 | case SSH_CHANNEL_PORT_LISTENER: |
| 475 | case SSH_CHANNEL_RPORT_LISTENER: |
| 476 | case SSH_CHANNEL_X11_LISTENER: |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 477 | channel_close_fd(&c->sock); |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 478 | channel_free(c); |
| 479 | break; |
| 480 | } |
| 481 | } |
| 482 | } |
| 483 | } |
| 484 | |
| 485 | /* |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 486 | * Returns true if no channel has too much buffered data, and false if one or |
| 487 | * more channel is overfull. |
| 488 | */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 489 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 490 | channel_not_very_much_buffered_data(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 491 | { |
| 492 | u_int i; |
| 493 | Channel *c; |
| 494 | |
| 495 | for (i = 0; i < channels_alloc; i++) { |
| 496 | c = channels[i]; |
| 497 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 498 | #if 0 |
| 499 | if (!compat20 && |
| 500 | buffer_len(&c->input) > packet_get_maxsize()) { |
Damien Miller | 275295e | 2003-01-08 14:04:09 +1100 | [diff] [blame] | 501 | debug2("channel %d: big input buffer %d", |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 502 | c->self, buffer_len(&c->input)); |
| 503 | return 0; |
| 504 | } |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 505 | #endif |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 506 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
Darren Tucker | 502d384 | 2003-06-28 12:38:01 +1000 | [diff] [blame] | 507 | debug2("channel %d: big output buffer %u > %u", |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 508 | c->self, buffer_len(&c->output), |
| 509 | packet_get_maxsize()); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 510 | return 0; |
| 511 | } |
| 512 | } |
| 513 | } |
| 514 | return 1; |
| 515 | } |
| 516 | |
| 517 | /* Returns true if any channel is still open. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 518 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 519 | channel_still_open(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 520 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 521 | u_int i; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 522 | Channel *c; |
| 523 | |
| 524 | for (i = 0; i < channels_alloc; i++) { |
| 525 | c = channels[i]; |
| 526 | if (c == NULL) |
| 527 | continue; |
| 528 | switch (c->type) { |
| 529 | case SSH_CHANNEL_X11_LISTENER: |
| 530 | case SSH_CHANNEL_PORT_LISTENER: |
| 531 | case SSH_CHANNEL_RPORT_LISTENER: |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 532 | case SSH_CHANNEL_MUX_LISTENER: |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 533 | case SSH_CHANNEL_CLOSED: |
| 534 | case SSH_CHANNEL_AUTH_SOCKET: |
| 535 | case SSH_CHANNEL_DYNAMIC: |
| 536 | case SSH_CHANNEL_CONNECTING: |
| 537 | case SSH_CHANNEL_ZOMBIE: |
| 538 | continue; |
| 539 | case SSH_CHANNEL_LARVAL: |
| 540 | if (!compat20) |
| 541 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); |
| 542 | continue; |
| 543 | case SSH_CHANNEL_OPENING: |
| 544 | case SSH_CHANNEL_OPEN: |
| 545 | case SSH_CHANNEL_X11_OPEN: |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 546 | case SSH_CHANNEL_MUX_CLIENT: |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 547 | return 1; |
| 548 | case SSH_CHANNEL_INPUT_DRAINING: |
| 549 | case SSH_CHANNEL_OUTPUT_DRAINING: |
| 550 | if (!compat13) |
| 551 | fatal("cannot happen: OUT_DRAIN"); |
| 552 | return 1; |
| 553 | default: |
| 554 | fatal("channel_still_open: bad channel type %d", c->type); |
| 555 | /* NOTREACHED */ |
| 556 | } |
| 557 | } |
| 558 | return 0; |
| 559 | } |
| 560 | |
| 561 | /* Returns the id of an open channel suitable for keepaliving */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 562 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 563 | channel_find_open(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 564 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 565 | u_int i; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 566 | Channel *c; |
| 567 | |
| 568 | for (i = 0; i < channels_alloc; i++) { |
| 569 | c = channels[i]; |
Damien Miller | 3bbd878 | 2004-06-18 22:23:22 +1000 | [diff] [blame] | 570 | if (c == NULL || c->remote_id < 0) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 571 | continue; |
| 572 | switch (c->type) { |
| 573 | case SSH_CHANNEL_CLOSED: |
| 574 | case SSH_CHANNEL_DYNAMIC: |
| 575 | case SSH_CHANNEL_X11_LISTENER: |
| 576 | case SSH_CHANNEL_PORT_LISTENER: |
| 577 | case SSH_CHANNEL_RPORT_LISTENER: |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 578 | case SSH_CHANNEL_MUX_LISTENER: |
| 579 | case SSH_CHANNEL_MUX_CLIENT: |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 580 | case SSH_CHANNEL_OPENING: |
| 581 | case SSH_CHANNEL_CONNECTING: |
| 582 | case SSH_CHANNEL_ZOMBIE: |
| 583 | continue; |
| 584 | case SSH_CHANNEL_LARVAL: |
| 585 | case SSH_CHANNEL_AUTH_SOCKET: |
| 586 | case SSH_CHANNEL_OPEN: |
| 587 | case SSH_CHANNEL_X11_OPEN: |
| 588 | return i; |
| 589 | case SSH_CHANNEL_INPUT_DRAINING: |
| 590 | case SSH_CHANNEL_OUTPUT_DRAINING: |
| 591 | if (!compat13) |
| 592 | fatal("cannot happen: OUT_DRAIN"); |
| 593 | return i; |
| 594 | default: |
| 595 | fatal("channel_find_open: bad channel type %d", c->type); |
| 596 | /* NOTREACHED */ |
| 597 | } |
| 598 | } |
| 599 | return -1; |
| 600 | } |
| 601 | |
| 602 | |
| 603 | /* |
| 604 | * Returns a message describing the currently open forwarded connections, |
| 605 | * suitable for sending to the client. The message contains crlf pairs for |
| 606 | * newlines. |
| 607 | */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 608 | char * |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 609 | channel_open_message(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 610 | { |
| 611 | Buffer buffer; |
| 612 | Channel *c; |
| 613 | char buf[1024], *cp; |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 614 | u_int i; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 615 | |
| 616 | buffer_init(&buffer); |
| 617 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); |
| 618 | buffer_append(&buffer, buf, strlen(buf)); |
| 619 | for (i = 0; i < channels_alloc; i++) { |
| 620 | c = channels[i]; |
| 621 | if (c == NULL) |
| 622 | continue; |
| 623 | switch (c->type) { |
| 624 | case SSH_CHANNEL_X11_LISTENER: |
| 625 | case SSH_CHANNEL_PORT_LISTENER: |
| 626 | case SSH_CHANNEL_RPORT_LISTENER: |
| 627 | case SSH_CHANNEL_CLOSED: |
| 628 | case SSH_CHANNEL_AUTH_SOCKET: |
| 629 | case SSH_CHANNEL_ZOMBIE: |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 630 | case SSH_CHANNEL_MUX_CLIENT: |
| 631 | case SSH_CHANNEL_MUX_LISTENER: |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 632 | continue; |
| 633 | case SSH_CHANNEL_LARVAL: |
| 634 | case SSH_CHANNEL_OPENING: |
| 635 | case SSH_CHANNEL_CONNECTING: |
| 636 | case SSH_CHANNEL_DYNAMIC: |
| 637 | case SSH_CHANNEL_OPEN: |
| 638 | case SSH_CHANNEL_X11_OPEN: |
| 639 | case SSH_CHANNEL_INPUT_DRAINING: |
| 640 | case SSH_CHANNEL_OUTPUT_DRAINING: |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 641 | snprintf(buf, sizeof buf, |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 642 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cc %d)\r\n", |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 643 | c->self, c->remote_name, |
| 644 | c->type, c->remote_id, |
| 645 | c->istate, buffer_len(&c->input), |
| 646 | c->ostate, buffer_len(&c->output), |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 647 | c->rfd, c->wfd, c->ctl_chan); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 648 | buffer_append(&buffer, buf, strlen(buf)); |
| 649 | continue; |
| 650 | default: |
| 651 | fatal("channel_open_message: bad channel type %d", c->type); |
| 652 | /* NOTREACHED */ |
| 653 | } |
| 654 | } |
| 655 | buffer_append(&buffer, "\0", 1); |
| 656 | cp = xstrdup(buffer_ptr(&buffer)); |
| 657 | buffer_free(&buffer); |
| 658 | return cp; |
| 659 | } |
| 660 | |
| 661 | void |
| 662 | channel_send_open(int id) |
| 663 | { |
| 664 | Channel *c = channel_lookup(id); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 665 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 666 | if (c == NULL) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 667 | logit("channel_send_open: %d: bad id", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 668 | return; |
| 669 | } |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 670 | debug2("channel %d: send open", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 671 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 672 | packet_put_cstring(c->ctype); |
| 673 | packet_put_int(c->self); |
| 674 | packet_put_int(c->local_window); |
| 675 | packet_put_int(c->local_maxpacket); |
| 676 | packet_send(); |
| 677 | } |
| 678 | |
| 679 | void |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 680 | channel_request_start(int id, char *service, int wantconfirm) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 681 | { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 682 | Channel *c = channel_lookup(id); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 683 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 684 | if (c == NULL) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 685 | logit("channel_request_start: %d: unknown channel id", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 686 | return; |
| 687 | } |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 688 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 689 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
| 690 | packet_put_int(c->remote_id); |
| 691 | packet_put_cstring(service); |
| 692 | packet_put_char(wantconfirm); |
| 693 | } |
Damien Miller | 4f7becb | 2006-03-26 14:10:14 +1100 | [diff] [blame] | 694 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 695 | void |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 696 | channel_register_status_confirm(int id, channel_confirm_cb *cb, |
| 697 | channel_confirm_abandon_cb *abandon_cb, void *ctx) |
| 698 | { |
| 699 | struct channel_confirm *cc; |
| 700 | Channel *c; |
| 701 | |
| 702 | if ((c = channel_lookup(id)) == NULL) |
| 703 | fatal("channel_register_expect: %d: bad id", id); |
| 704 | |
| 705 | cc = xmalloc(sizeof(*cc)); |
| 706 | cc->cb = cb; |
| 707 | cc->abandon_cb = abandon_cb; |
| 708 | cc->ctx = ctx; |
| 709 | TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry); |
| 710 | } |
| 711 | |
| 712 | void |
Damien Miller | d530f5f | 2010-05-21 14:57:10 +1000 | [diff] [blame] | 713 | channel_register_open_confirm(int id, channel_open_fn *fn, void *ctx) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 714 | { |
| 715 | Channel *c = channel_lookup(id); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 716 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 717 | if (c == NULL) { |
Damien Miller | a009433 | 2008-11-03 19:26:35 +1100 | [diff] [blame] | 718 | logit("channel_register_open_confirm: %d: bad id", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 719 | return; |
| 720 | } |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 721 | c->open_confirm = fn; |
| 722 | c->open_confirm_ctx = ctx; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 723 | } |
Damien Miller | 4f7becb | 2006-03-26 14:10:14 +1100 | [diff] [blame] | 724 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 725 | void |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 726 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 727 | { |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 728 | Channel *c = channel_by_id(id); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 729 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 730 | if (c == NULL) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 731 | logit("channel_register_cleanup: %d: bad id", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 732 | return; |
| 733 | } |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 734 | c->detach_user = fn; |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 735 | c->detach_close = do_close; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 736 | } |
Damien Miller | 4f7becb | 2006-03-26 14:10:14 +1100 | [diff] [blame] | 737 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 738 | void |
| 739 | channel_cancel_cleanup(int id) |
| 740 | { |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 741 | Channel *c = channel_by_id(id); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 742 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 743 | if (c == NULL) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 744 | logit("channel_cancel_cleanup: %d: bad id", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 745 | return; |
| 746 | } |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 747 | c->detach_user = NULL; |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 748 | c->detach_close = 0; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 749 | } |
Damien Miller | 4f7becb | 2006-03-26 14:10:14 +1100 | [diff] [blame] | 750 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 751 | void |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 752 | channel_register_filter(int id, channel_infilter_fn *ifn, |
Darren Tucker | 84c56f5 | 2008-06-13 04:55:46 +1000 | [diff] [blame] | 753 | channel_outfilter_fn *ofn, channel_filter_cleanup_fn *cfn, void *ctx) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 754 | { |
| 755 | Channel *c = channel_lookup(id); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 756 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 757 | if (c == NULL) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 758 | logit("channel_register_filter: %d: bad id", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 759 | return; |
| 760 | } |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 761 | c->input_filter = ifn; |
| 762 | c->output_filter = ofn; |
Darren Tucker | 2fb66ca | 2008-06-13 04:49:33 +1000 | [diff] [blame] | 763 | c->filter_ctx = ctx; |
Darren Tucker | 84c56f5 | 2008-06-13 04:55:46 +1000 | [diff] [blame] | 764 | c->filter_cleanup = cfn; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 765 | } |
| 766 | |
| 767 | void |
| 768 | channel_set_fds(int id, int rfd, int wfd, int efd, |
Darren Tucker | ed3cdc0 | 2008-06-16 23:29:18 +1000 | [diff] [blame] | 769 | int extusage, int nonblock, int is_tty, u_int window_max) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 770 | { |
| 771 | Channel *c = channel_lookup(id); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 772 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 773 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
| 774 | fatal("channel_activate for non-larval channel %d.", id); |
Darren Tucker | ed3cdc0 | 2008-06-16 23:29:18 +1000 | [diff] [blame] | 775 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, is_tty); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 776 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | 2aa0c19 | 2002-02-19 15:20:08 +1100 | [diff] [blame] | 777 | c->local_window = c->local_window_max = window_max; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 778 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
| 779 | packet_put_int(c->remote_id); |
| 780 | packet_put_int(c->local_window); |
| 781 | packet_send(); |
| 782 | } |
| 783 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 784 | /* |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 785 | * 'channel_pre*' are called just before select() to add any bits relevant to |
| 786 | * channels in the select bitmasks. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 787 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 788 | /* |
| 789 | * 'channel_post*': perform any appropriate operations for channels which |
| 790 | * have events pending. |
| 791 | */ |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 792 | typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 793 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
| 794 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; |
| 795 | |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 796 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 797 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 798 | channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 799 | { |
| 800 | FD_SET(c->sock, readset); |
| 801 | } |
| 802 | |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 803 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 804 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 805 | channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 806 | { |
| 807 | debug3("channel %d: waiting for connection", c->self); |
| 808 | FD_SET(c->sock, writeset); |
| 809 | } |
| 810 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 811 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 812 | channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 813 | { |
| 814 | if (buffer_len(&c->input) < packet_get_maxsize()) |
| 815 | FD_SET(c->sock, readset); |
| 816 | if (buffer_len(&c->output) > 0) |
| 817 | FD_SET(c->sock, writeset); |
| 818 | } |
| 819 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 820 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 821 | channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 822 | { |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 823 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 824 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 825 | if (c->istate == CHAN_INPUT_OPEN && |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 826 | limit > 0 && |
Damien Miller | 499a0d5 | 2006-04-23 12:06:03 +1000 | [diff] [blame] | 827 | buffer_len(&c->input) < limit && |
| 828 | buffer_check_alloc(&c->input, CHAN_RBUF)) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 829 | FD_SET(c->rfd, readset); |
| 830 | if (c->ostate == CHAN_OUTPUT_OPEN || |
| 831 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
| 832 | if (buffer_len(&c->output) > 0) { |
| 833 | FD_SET(c->wfd, writeset); |
| 834 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 835 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
Damien Miller | 0dc1bef | 2005-07-17 17:22:45 +1000 | [diff] [blame] | 836 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
| 837 | c->self, c->efd, buffer_len(&c->extended)); |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 838 | else |
| 839 | chan_obuf_empty(c); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 840 | } |
| 841 | } |
| 842 | /** XXX check close conditions, too */ |
Damien Miller | d654dd2 | 2008-05-19 16:05:41 +1000 | [diff] [blame] | 843 | if (compat20 && c->efd != -1 && |
| 844 | !(c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED)) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 845 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
| 846 | buffer_len(&c->extended) > 0) |
| 847 | FD_SET(c->efd, writeset); |
Damien Miller | 8853ca5 | 2010-06-26 10:00:14 +1000 | [diff] [blame] | 848 | else if (c->efd != -1 && !(c->flags & CHAN_EOF_SENT) && |
| 849 | (c->extended_usage == CHAN_EXTENDED_READ || |
| 850 | c->extended_usage == CHAN_EXTENDED_IGNORE) && |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 851 | buffer_len(&c->extended) < c->remote_window) |
| 852 | FD_SET(c->efd, readset); |
| 853 | } |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 854 | /* XXX: What about efd? races? */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 855 | } |
| 856 | |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 857 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 858 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 859 | channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 860 | { |
| 861 | if (buffer_len(&c->input) == 0) { |
| 862 | packet_start(SSH_MSG_CHANNEL_CLOSE); |
| 863 | packet_put_int(c->remote_id); |
| 864 | packet_send(); |
| 865 | c->type = SSH_CHANNEL_CLOSED; |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 866 | debug2("channel %d: closing after input drain.", c->self); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 867 | } |
| 868 | } |
| 869 | |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 870 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 871 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 872 | channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 873 | { |
| 874 | if (buffer_len(&c->output) == 0) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 875 | chan_mark_dead(c); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 876 | else |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 877 | FD_SET(c->sock, writeset); |
| 878 | } |
| 879 | |
| 880 | /* |
| 881 | * This is a special state for X11 authentication spoofing. An opened X11 |
| 882 | * connection (when authentication spoofing is being done) remains in this |
| 883 | * state until the first packet has been completely read. The authentication |
| 884 | * data in that packet is then substituted by the real data if it matches the |
| 885 | * fake data, and the channel is put into normal mode. |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 886 | * XXX All this happens at the client side. |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 887 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 888 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 889 | static int |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 890 | x11_open_helper(Buffer *b) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 891 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 892 | u_char *ucp; |
| 893 | u_int proto_len, data_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 894 | |
| 895 | /* Check if the fixed size part of the packet is in buffer. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 896 | if (buffer_len(b) < 12) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 897 | return 0; |
| 898 | |
| 899 | /* Parse the lengths of variable-length fields. */ |
Damien Miller | 708d21c | 2002-01-22 23:18:15 +1100 | [diff] [blame] | 900 | ucp = buffer_ptr(b); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 901 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
| 902 | proto_len = 256 * ucp[6] + ucp[7]; |
| 903 | data_len = 256 * ucp[8] + ucp[9]; |
| 904 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ |
| 905 | proto_len = ucp[6] + 256 * ucp[7]; |
| 906 | data_len = ucp[8] + 256 * ucp[9]; |
| 907 | } else { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 908 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 909 | ucp[0]); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 910 | return -1; |
| 911 | } |
| 912 | |
| 913 | /* Check if the whole packet is in buffer. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 914 | if (buffer_len(b) < |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 915 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
| 916 | return 0; |
| 917 | |
| 918 | /* Check if authentication protocol matches. */ |
| 919 | if (proto_len != strlen(x11_saved_proto) || |
| 920 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 921 | debug2("X11 connection uses different authentication protocol."); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 922 | return -1; |
| 923 | } |
| 924 | /* Check if authentication data matches our fake data. */ |
| 925 | if (data_len != x11_fake_data_len || |
Damien Miller | ea1651c | 2010-07-16 13:58:37 +1000 | [diff] [blame] | 926 | timingsafe_bcmp(ucp + 12 + ((proto_len + 3) & ~3), |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 927 | x11_fake_data, x11_fake_data_len) != 0) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 928 | debug2("X11 auth data does not match fake data."); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 929 | return -1; |
| 930 | } |
| 931 | /* Check fake data length */ |
| 932 | if (x11_fake_data_len != x11_saved_data_len) { |
| 933 | error("X11 fake_data_len %d != saved_data_len %d", |
| 934 | x11_fake_data_len, x11_saved_data_len); |
| 935 | return -1; |
| 936 | } |
| 937 | /* |
| 938 | * Received authentication protocol and data match |
| 939 | * our fake data. Substitute the fake data with real |
| 940 | * data. |
| 941 | */ |
| 942 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), |
| 943 | x11_saved_data, x11_saved_data_len); |
| 944 | return 1; |
| 945 | } |
| 946 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 947 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 948 | channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 949 | { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 950 | int ret = x11_open_helper(&c->output); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 951 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 952 | if (ret == 1) { |
| 953 | /* Start normal processing for the channel. */ |
| 954 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 955 | channel_pre_open_13(c, readset, writeset); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 956 | } else if (ret == -1) { |
| 957 | /* |
| 958 | * We have received an X11 connection that has bad |
| 959 | * authentication information. |
| 960 | */ |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 961 | logit("X11 connection rejected because of wrong authentication."); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 962 | buffer_clear(&c->input); |
| 963 | buffer_clear(&c->output); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 964 | channel_close_fd(&c->sock); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 965 | c->sock = -1; |
| 966 | c->type = SSH_CHANNEL_CLOSED; |
| 967 | packet_start(SSH_MSG_CHANNEL_CLOSE); |
| 968 | packet_put_int(c->remote_id); |
| 969 | packet_send(); |
| 970 | } |
| 971 | } |
| 972 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 973 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 974 | channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 975 | { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 976 | int ret = x11_open_helper(&c->output); |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 977 | |
| 978 | /* c->force_drain = 1; */ |
| 979 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 980 | if (ret == 1) { |
| 981 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 982 | channel_pre_open(c, readset, writeset); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 983 | } else if (ret == -1) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 984 | logit("X11 connection rejected because of wrong authentication."); |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 985 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
Damien Miller | a90fc08 | 2002-01-22 23:19:38 +1100 | [diff] [blame] | 986 | chan_read_failed(c); |
| 987 | buffer_clear(&c->input); |
| 988 | chan_ibuf_empty(c); |
| 989 | buffer_clear(&c->output); |
| 990 | /* for proto v1, the peer will send an IEOF */ |
| 991 | if (compat20) |
| 992 | chan_write_failed(c); |
| 993 | else |
| 994 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 995 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 996 | } |
| 997 | } |
| 998 | |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 999 | static void |
| 1000 | channel_pre_mux_client(Channel *c, fd_set *readset, fd_set *writeset) |
| 1001 | { |
Damien Miller | d530f5f | 2010-05-21 14:57:10 +1000 | [diff] [blame] | 1002 | if (c->istate == CHAN_INPUT_OPEN && !c->mux_pause && |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1003 | buffer_check_alloc(&c->input, CHAN_RBUF)) |
| 1004 | FD_SET(c->rfd, readset); |
| 1005 | if (c->istate == CHAN_INPUT_WAIT_DRAIN) { |
| 1006 | /* clear buffer immediately (discard any partial packet) */ |
| 1007 | buffer_clear(&c->input); |
| 1008 | chan_ibuf_empty(c); |
| 1009 | /* Start output drain. XXX just kill chan? */ |
| 1010 | chan_rcvd_oclose(c); |
| 1011 | } |
| 1012 | if (c->ostate == CHAN_OUTPUT_OPEN || |
| 1013 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
| 1014 | if (buffer_len(&c->output) > 0) |
| 1015 | FD_SET(c->wfd, writeset); |
| 1016 | else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) |
| 1017 | chan_obuf_empty(c); |
| 1018 | } |
| 1019 | } |
| 1020 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1021 | /* try to decode a socks4 header */ |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 1022 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1023 | static int |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1024 | channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1025 | { |
Damien Miller | a10f561 | 2002-09-12 09:49:15 +1000 | [diff] [blame] | 1026 | char *p, *host; |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1027 | u_int len, have, i, found, need; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1028 | char username[256]; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1029 | struct { |
| 1030 | u_int8_t version; |
| 1031 | u_int8_t command; |
| 1032 | u_int16_t dest_port; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1033 | struct in_addr dest_addr; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1034 | } s4_req, s4_rsp; |
| 1035 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1036 | debug2("channel %d: decode socks4", c->self); |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 1037 | |
| 1038 | have = buffer_len(&c->input); |
| 1039 | len = sizeof(s4_req); |
| 1040 | if (have < len) |
| 1041 | return 0; |
| 1042 | p = buffer_ptr(&c->input); |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1043 | |
| 1044 | need = 1; |
| 1045 | /* SOCKS4A uses an invalid IP address 0.0.0.x */ |
| 1046 | if (p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] != 0) { |
| 1047 | debug2("channel %d: socks4a request", c->self); |
| 1048 | /* ... and needs an extra string (the hostname) */ |
| 1049 | need = 2; |
| 1050 | } |
| 1051 | /* Check for terminating NUL on the string(s) */ |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 1052 | for (found = 0, i = len; i < have; i++) { |
| 1053 | if (p[i] == '\0') { |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1054 | found++; |
| 1055 | if (found == need) |
| 1056 | break; |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 1057 | } |
| 1058 | if (i > 1024) { |
| 1059 | /* the peer is probably sending garbage */ |
| 1060 | debug("channel %d: decode socks4: too long", |
| 1061 | c->self); |
| 1062 | return -1; |
| 1063 | } |
| 1064 | } |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1065 | if (found < need) |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 1066 | return 0; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1067 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
| 1068 | buffer_get(&c->input, (char *)&s4_req.command, 1); |
| 1069 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1070 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 1071 | have = buffer_len(&c->input); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1072 | p = buffer_ptr(&c->input); |
| 1073 | len = strlen(p); |
Ben Lindstrom | 6fa9d10 | 2001-04-11 23:08:17 +0000 | [diff] [blame] | 1074 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1075 | len++; /* trailing '\0' */ |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1076 | if (len > have) |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1077 | fatal("channel %d: decode socks4: len %d > have %d", |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1078 | c->self, len, have); |
| 1079 | strlcpy(username, p, sizeof(username)); |
| 1080 | buffer_consume(&c->input, len); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1081 | |
Damien Miller | a1c1b6c | 2009-01-28 16:29:49 +1100 | [diff] [blame] | 1082 | if (c->path != NULL) { |
| 1083 | xfree(c->path); |
| 1084 | c->path = NULL; |
| 1085 | } |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1086 | if (need == 1) { /* SOCKS4: one string */ |
| 1087 | host = inet_ntoa(s4_req.dest_addr); |
Damien Miller | a1c1b6c | 2009-01-28 16:29:49 +1100 | [diff] [blame] | 1088 | c->path = xstrdup(host); |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1089 | } else { /* SOCKS4A: two strings */ |
| 1090 | have = buffer_len(&c->input); |
| 1091 | p = buffer_ptr(&c->input); |
| 1092 | len = strlen(p); |
| 1093 | debug2("channel %d: decode socks4a: host %s/%d", |
| 1094 | c->self, p, len); |
| 1095 | len++; /* trailing '\0' */ |
| 1096 | if (len > have) |
| 1097 | fatal("channel %d: decode socks4a: len %d > have %d", |
| 1098 | c->self, len, have); |
Damien Miller | a1c1b6c | 2009-01-28 16:29:49 +1100 | [diff] [blame] | 1099 | if (len > NI_MAXHOST) { |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1100 | error("channel %d: hostname \"%.100s\" too long", |
| 1101 | c->self, p); |
| 1102 | return -1; |
| 1103 | } |
Damien Miller | a1c1b6c | 2009-01-28 16:29:49 +1100 | [diff] [blame] | 1104 | c->path = xstrdup(p); |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1105 | buffer_consume(&c->input, len); |
| 1106 | } |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1107 | c->host_port = ntohs(s4_req.dest_port); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1108 | |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1109 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1110 | c->self, c->path, c->host_port, s4_req.command); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1111 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1112 | if (s4_req.command != 1) { |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1113 | debug("channel %d: cannot handle: %s cn %d", |
| 1114 | c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1115 | return -1; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1116 | } |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1117 | s4_rsp.version = 0; /* vn: 0 for reply */ |
| 1118 | s4_rsp.command = 90; /* cd: req granted */ |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1119 | s4_rsp.dest_port = 0; /* ignored */ |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1120 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
Damien Miller | a0fdce9 | 2006-03-26 14:28:50 +1100 | [diff] [blame] | 1121 | buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1122 | return 1; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1123 | } |
| 1124 | |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1125 | /* try to decode a socks5 header */ |
| 1126 | #define SSH_SOCKS5_AUTHDONE 0x1000 |
| 1127 | #define SSH_SOCKS5_NOAUTH 0x00 |
| 1128 | #define SSH_SOCKS5_IPV4 0x01 |
| 1129 | #define SSH_SOCKS5_DOMAIN 0x03 |
| 1130 | #define SSH_SOCKS5_IPV6 0x04 |
| 1131 | #define SSH_SOCKS5_CONNECT 0x01 |
| 1132 | #define SSH_SOCKS5_SUCCESS 0x00 |
| 1133 | |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 1134 | /* ARGSUSED */ |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1135 | static int |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1136 | channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1137 | { |
| 1138 | struct { |
| 1139 | u_int8_t version; |
| 1140 | u_int8_t command; |
| 1141 | u_int8_t reserved; |
| 1142 | u_int8_t atyp; |
| 1143 | } s5_req, s5_rsp; |
| 1144 | u_int16_t dest_port; |
Damien Miller | a1c1b6c | 2009-01-28 16:29:49 +1100 | [diff] [blame] | 1145 | u_char *p, dest_addr[255+1], ntop[INET6_ADDRSTRLEN]; |
Damien Miller | 0f07707 | 2006-07-10 22:21:02 +1000 | [diff] [blame] | 1146 | u_int have, need, i, found, nmethods, addrlen, af; |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1147 | |
| 1148 | debug2("channel %d: decode socks5", c->self); |
| 1149 | p = buffer_ptr(&c->input); |
| 1150 | if (p[0] != 0x05) |
| 1151 | return -1; |
| 1152 | have = buffer_len(&c->input); |
| 1153 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { |
| 1154 | /* format: ver | nmethods | methods */ |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 1155 | if (have < 2) |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1156 | return 0; |
| 1157 | nmethods = p[1]; |
| 1158 | if (have < nmethods + 2) |
| 1159 | return 0; |
| 1160 | /* look for method: "NO AUTHENTICATION REQUIRED" */ |
Damien Miller | 8016390 | 2007-01-05 16:30:16 +1100 | [diff] [blame] | 1161 | for (found = 0, i = 2; i < nmethods + 2; i++) { |
Damien Miller | 4dec5d7 | 2006-08-05 11:38:40 +1000 | [diff] [blame] | 1162 | if (p[i] == SSH_SOCKS5_NOAUTH) { |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1163 | found = 1; |
| 1164 | break; |
| 1165 | } |
| 1166 | } |
| 1167 | if (!found) { |
| 1168 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", |
| 1169 | c->self); |
| 1170 | return -1; |
| 1171 | } |
| 1172 | buffer_consume(&c->input, nmethods + 2); |
| 1173 | buffer_put_char(&c->output, 0x05); /* version */ |
| 1174 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ |
| 1175 | FD_SET(c->sock, writeset); |
| 1176 | c->flags |= SSH_SOCKS5_AUTHDONE; |
| 1177 | debug2("channel %d: socks5 auth done", c->self); |
| 1178 | return 0; /* need more */ |
| 1179 | } |
| 1180 | debug2("channel %d: socks5 post auth", c->self); |
| 1181 | if (have < sizeof(s5_req)+1) |
| 1182 | return 0; /* need more */ |
Damien Miller | e3b21a5 | 2006-03-26 14:29:06 +1100 | [diff] [blame] | 1183 | memcpy(&s5_req, p, sizeof(s5_req)); |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1184 | if (s5_req.version != 0x05 || |
| 1185 | s5_req.command != SSH_SOCKS5_CONNECT || |
| 1186 | s5_req.reserved != 0x00) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1187 | debug2("channel %d: only socks5 connect supported", c->self); |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1188 | return -1; |
| 1189 | } |
Darren Tucker | 47eede7 | 2005-03-14 23:08:12 +1100 | [diff] [blame] | 1190 | switch (s5_req.atyp){ |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1191 | case SSH_SOCKS5_IPV4: |
| 1192 | addrlen = 4; |
| 1193 | af = AF_INET; |
| 1194 | break; |
| 1195 | case SSH_SOCKS5_DOMAIN: |
| 1196 | addrlen = p[sizeof(s5_req)]; |
| 1197 | af = -1; |
| 1198 | break; |
| 1199 | case SSH_SOCKS5_IPV6: |
| 1200 | addrlen = 16; |
| 1201 | af = AF_INET6; |
| 1202 | break; |
| 1203 | default: |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1204 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1205 | return -1; |
| 1206 | } |
Damien Miller | 0f07707 | 2006-07-10 22:21:02 +1000 | [diff] [blame] | 1207 | need = sizeof(s5_req) + addrlen + 2; |
| 1208 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) |
| 1209 | need++; |
| 1210 | if (have < need) |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1211 | return 0; |
| 1212 | buffer_consume(&c->input, sizeof(s5_req)); |
| 1213 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) |
| 1214 | buffer_consume(&c->input, 1); /* host string length */ |
| 1215 | buffer_get(&c->input, (char *)&dest_addr, addrlen); |
| 1216 | buffer_get(&c->input, (char *)&dest_port, 2); |
| 1217 | dest_addr[addrlen] = '\0'; |
Damien Miller | a1c1b6c | 2009-01-28 16:29:49 +1100 | [diff] [blame] | 1218 | if (c->path != NULL) { |
| 1219 | xfree(c->path); |
| 1220 | c->path = NULL; |
| 1221 | } |
| 1222 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) { |
Damien Miller | 9576ac4 | 2009-01-28 16:30:33 +1100 | [diff] [blame] | 1223 | if (addrlen >= NI_MAXHOST) { |
Damien Miller | a1c1b6c | 2009-01-28 16:29:49 +1100 | [diff] [blame] | 1224 | error("channel %d: dynamic request: socks5 hostname " |
| 1225 | "\"%.100s\" too long", c->self, dest_addr); |
| 1226 | return -1; |
| 1227 | } |
| 1228 | c->path = xstrdup(dest_addr); |
| 1229 | } else { |
| 1230 | if (inet_ntop(af, dest_addr, ntop, sizeof(ntop)) == NULL) |
| 1231 | return -1; |
| 1232 | c->path = xstrdup(ntop); |
| 1233 | } |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1234 | c->host_port = ntohs(dest_port); |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 1235 | |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1236 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1237 | c->self, c->path, c->host_port, s5_req.command); |
| 1238 | |
| 1239 | s5_rsp.version = 0x05; |
| 1240 | s5_rsp.command = SSH_SOCKS5_SUCCESS; |
| 1241 | s5_rsp.reserved = 0; /* ignored */ |
| 1242 | s5_rsp.atyp = SSH_SOCKS5_IPV4; |
| 1243 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; |
| 1244 | dest_port = 0; /* ignored */ |
| 1245 | |
Damien Miller | a0fdce9 | 2006-03-26 14:28:50 +1100 | [diff] [blame] | 1246 | buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); |
| 1247 | buffer_append(&c->output, &dest_addr, sizeof(struct in_addr)); |
| 1248 | buffer_append(&c->output, &dest_port, sizeof(dest_port)); |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1249 | return 1; |
| 1250 | } |
| 1251 | |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1252 | Channel * |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1253 | channel_connect_stdio_fwd(const char *host_to_connect, u_short port_to_connect, |
| 1254 | int in, int out) |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1255 | { |
| 1256 | Channel *c; |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1257 | |
| 1258 | debug("channel_connect_stdio_fwd %s:%d", host_to_connect, |
| 1259 | port_to_connect); |
| 1260 | |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1261 | c = channel_new("stdio-forward", SSH_CHANNEL_OPENING, in, out, |
| 1262 | -1, CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
| 1263 | 0, "stdio-forward", /*nonblock*/0); |
| 1264 | |
| 1265 | c->path = xstrdup(host_to_connect); |
| 1266 | c->host_port = port_to_connect; |
| 1267 | c->listening_port = 0; |
| 1268 | c->force_drain = 1; |
| 1269 | |
| 1270 | channel_register_fds(c, in, out, -1, 0, 1, 0); |
| 1271 | port_open_helper(c, "direct-tcpip"); |
| 1272 | |
| 1273 | return c; |
| 1274 | } |
| 1275 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1276 | /* dynamic port forwarding */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1277 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1278 | channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1279 | { |
| 1280 | u_char *p; |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 1281 | u_int have; |
| 1282 | int ret; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1283 | |
| 1284 | have = buffer_len(&c->input); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1285 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
Ben Lindstrom | c486d88 | 2001-04-11 16:08:34 +0000 | [diff] [blame] | 1286 | /* buffer_dump(&c->input); */ |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1287 | /* check if the fixed size part of the packet is in buffer. */ |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1288 | if (have < 3) { |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1289 | /* need more */ |
| 1290 | FD_SET(c->sock, readset); |
| 1291 | return; |
| 1292 | } |
| 1293 | /* try to guess the protocol */ |
| 1294 | p = buffer_ptr(&c->input); |
| 1295 | switch (p[0]) { |
Ben Lindstrom | 6fa9d10 | 2001-04-11 23:08:17 +0000 | [diff] [blame] | 1296 | case 0x04: |
| 1297 | ret = channel_decode_socks4(c, readset, writeset); |
| 1298 | break; |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1299 | case 0x05: |
| 1300 | ret = channel_decode_socks5(c, readset, writeset); |
| 1301 | break; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1302 | default: |
| 1303 | ret = -1; |
| 1304 | break; |
| 1305 | } |
| 1306 | if (ret < 0) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1307 | chan_mark_dead(c); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1308 | } else if (ret == 0) { |
| 1309 | debug2("channel %d: pre_dynamic: need more", c->self); |
| 1310 | /* need more */ |
| 1311 | FD_SET(c->sock, readset); |
| 1312 | } else { |
| 1313 | /* switch to the next state */ |
| 1314 | c->type = SSH_CHANNEL_OPENING; |
| 1315 | port_open_helper(c, "direct-tcpip"); |
| 1316 | } |
| 1317 | } |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1318 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1319 | /* This is our fake X11 server socket. */ |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 1320 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1321 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1322 | channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1323 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1324 | Channel *nc; |
Damien Miller | 163886f | 2008-07-14 11:28:58 +1000 | [diff] [blame] | 1325 | struct sockaddr_storage addr; |
Damien Miller | 398e1cf | 2002-02-05 11:52:13 +1100 | [diff] [blame] | 1326 | int newsock; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1327 | socklen_t addrlen; |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1328 | char buf[16384], *remote_ipaddr; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1329 | int remote_port; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1330 | |
| 1331 | if (FD_ISSET(c->sock, readset)) { |
| 1332 | debug("X11 connection requested."); |
| 1333 | addrlen = sizeof(addr); |
Damien Miller | 163886f | 2008-07-14 11:28:58 +1000 | [diff] [blame] | 1334 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 1335 | if (c->single_connection) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1336 | debug2("single_connection: closing X11 listener."); |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 1337 | channel_close_fd(&c->sock); |
| 1338 | chan_mark_dead(c); |
| 1339 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1340 | if (newsock < 0) { |
| 1341 | error("accept: %.100s", strerror(errno)); |
| 1342 | return; |
| 1343 | } |
Damien Miller | 398e1cf | 2002-02-05 11:52:13 +1100 | [diff] [blame] | 1344 | set_nodelay(newsock); |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1345 | remote_ipaddr = get_peer_ipaddr(newsock); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1346 | remote_port = get_peer_port(newsock); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1347 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1348 | remote_ipaddr, remote_port); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1349 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1350 | nc = channel_new("accepted x11 socket", |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1351 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 1352 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1353 | if (compat20) { |
| 1354 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 1355 | packet_put_cstring("x11"); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1356 | packet_put_int(nc->self); |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 1357 | packet_put_int(nc->local_window_max); |
| 1358 | packet_put_int(nc->local_maxpacket); |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1359 | /* originator ipaddr and port */ |
| 1360 | packet_put_cstring(remote_ipaddr); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 1361 | if (datafellows & SSH_BUG_X11FWD) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1362 | debug2("ssh2 x11 bug compat mode"); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 1363 | } else { |
| 1364 | packet_put_int(remote_port); |
| 1365 | } |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1366 | packet_send(); |
| 1367 | } else { |
| 1368 | packet_start(SSH_SMSG_X11_OPEN); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1369 | packet_put_int(nc->self); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1370 | if (packet_get_protocol_flags() & |
| 1371 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) |
Ben Lindstrom | 664408d | 2001-06-09 01:42:01 +0000 | [diff] [blame] | 1372 | packet_put_cstring(buf); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1373 | packet_send(); |
| 1374 | } |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1375 | xfree(remote_ipaddr); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1376 | } |
| 1377 | } |
| 1378 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1379 | static void |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1380 | port_open_helper(Channel *c, char *rtype) |
| 1381 | { |
| 1382 | int direct; |
| 1383 | char buf[1024]; |
| 1384 | char *remote_ipaddr = get_peer_ipaddr(c->sock); |
Damien Miller | 677257f | 2005-06-17 12:55:03 +1000 | [diff] [blame] | 1385 | int remote_port = get_peer_port(c->sock); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1386 | |
Damien Miller | d636943 | 2010-02-02 17:02:07 +1100 | [diff] [blame] | 1387 | if (remote_port == -1) { |
| 1388 | /* Fake addr/port to appease peers that validate it (Tectia) */ |
| 1389 | xfree(remote_ipaddr); |
| 1390 | remote_ipaddr = xstrdup("127.0.0.1"); |
| 1391 | remote_port = 65535; |
| 1392 | } |
| 1393 | |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1394 | direct = (strcmp(rtype, "direct-tcpip") == 0); |
| 1395 | |
| 1396 | snprintf(buf, sizeof buf, |
| 1397 | "%s: listening port %d for %.100s port %d, " |
| 1398 | "connect from %.200s port %d", |
| 1399 | rtype, c->listening_port, c->path, c->host_port, |
| 1400 | remote_ipaddr, remote_port); |
| 1401 | |
| 1402 | xfree(c->remote_name); |
| 1403 | c->remote_name = xstrdup(buf); |
| 1404 | |
| 1405 | if (compat20) { |
| 1406 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 1407 | packet_put_cstring(rtype); |
| 1408 | packet_put_int(c->self); |
| 1409 | packet_put_int(c->local_window_max); |
| 1410 | packet_put_int(c->local_maxpacket); |
| 1411 | if (direct) { |
| 1412 | /* target host, port */ |
| 1413 | packet_put_cstring(c->path); |
| 1414 | packet_put_int(c->host_port); |
| 1415 | } else { |
| 1416 | /* listen address, port */ |
| 1417 | packet_put_cstring(c->path); |
| 1418 | packet_put_int(c->listening_port); |
| 1419 | } |
| 1420 | /* originator host and port */ |
| 1421 | packet_put_cstring(remote_ipaddr); |
Damien Miller | 677257f | 2005-06-17 12:55:03 +1000 | [diff] [blame] | 1422 | packet_put_int((u_int)remote_port); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1423 | packet_send(); |
| 1424 | } else { |
| 1425 | packet_start(SSH_MSG_PORT_OPEN); |
| 1426 | packet_put_int(c->self); |
| 1427 | packet_put_cstring(c->path); |
| 1428 | packet_put_int(c->host_port); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1429 | if (packet_get_protocol_flags() & |
| 1430 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1431 | packet_put_cstring(c->remote_name); |
| 1432 | packet_send(); |
| 1433 | } |
| 1434 | xfree(remote_ipaddr); |
| 1435 | } |
| 1436 | |
Damien Miller | 5e7fd07 | 2005-11-05 14:53:39 +1100 | [diff] [blame] | 1437 | static void |
| 1438 | channel_set_reuseaddr(int fd) |
| 1439 | { |
| 1440 | int on = 1; |
| 1441 | |
| 1442 | /* |
| 1443 | * Set socket options. |
| 1444 | * Allow local port reuse in TIME_WAIT. |
| 1445 | */ |
| 1446 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) |
| 1447 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); |
| 1448 | } |
| 1449 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1450 | /* |
| 1451 | * This socket is listening for connections to a forwarded TCP/IP port. |
| 1452 | */ |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 1453 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1454 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1455 | channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1456 | { |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1457 | Channel *nc; |
Damien Miller | 163886f | 2008-07-14 11:28:58 +1000 | [diff] [blame] | 1458 | struct sockaddr_storage addr; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1459 | int newsock, nextstate; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1460 | socklen_t addrlen; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1461 | char *rtype; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1462 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1463 | if (FD_ISSET(c->sock, readset)) { |
| 1464 | debug("Connection to port %d forwarding " |
| 1465 | "to %.100s port %d requested.", |
| 1466 | c->listening_port, c->path, c->host_port); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1467 | |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1468 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
| 1469 | nextstate = SSH_CHANNEL_OPENING; |
| 1470 | rtype = "forwarded-tcpip"; |
| 1471 | } else { |
| 1472 | if (c->host_port == 0) { |
| 1473 | nextstate = SSH_CHANNEL_DYNAMIC; |
Damien Miller | d3c04b9 | 2001-10-10 15:04:20 +1000 | [diff] [blame] | 1474 | rtype = "dynamic-tcpip"; |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1475 | } else { |
| 1476 | nextstate = SSH_CHANNEL_OPENING; |
| 1477 | rtype = "direct-tcpip"; |
| 1478 | } |
| 1479 | } |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1480 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1481 | addrlen = sizeof(addr); |
Damien Miller | 163886f | 2008-07-14 11:28:58 +1000 | [diff] [blame] | 1482 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1483 | if (newsock < 0) { |
| 1484 | error("accept: %.100s", strerror(errno)); |
| 1485 | return; |
| 1486 | } |
Ben Lindstrom | 1ebd7a5 | 2002-02-26 18:12:51 +0000 | [diff] [blame] | 1487 | set_nodelay(newsock); |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 1488 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
| 1489 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1490 | nc->listening_port = c->listening_port; |
| 1491 | nc->host_port = c->host_port; |
Damien Miller | a1c1b6c | 2009-01-28 16:29:49 +1100 | [diff] [blame] | 1492 | if (c->path != NULL) |
| 1493 | nc->path = xstrdup(c->path); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1494 | |
Darren Tucker | 876045b | 2010-01-08 17:08:00 +1100 | [diff] [blame] | 1495 | if (nextstate != SSH_CHANNEL_DYNAMIC) |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1496 | port_open_helper(nc, rtype); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1497 | } |
| 1498 | } |
| 1499 | |
| 1500 | /* |
| 1501 | * This is the authentication agent socket listening for connections from |
| 1502 | * clients. |
| 1503 | */ |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 1504 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1505 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1506 | channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1507 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1508 | Channel *nc; |
| 1509 | int newsock; |
Damien Miller | 163886f | 2008-07-14 11:28:58 +1000 | [diff] [blame] | 1510 | struct sockaddr_storage addr; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1511 | socklen_t addrlen; |
| 1512 | |
| 1513 | if (FD_ISSET(c->sock, readset)) { |
| 1514 | addrlen = sizeof(addr); |
Damien Miller | 163886f | 2008-07-14 11:28:58 +1000 | [diff] [blame] | 1515 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1516 | if (newsock < 0) { |
| 1517 | error("accept from auth socket: %.100s", strerror(errno)); |
| 1518 | return; |
| 1519 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1520 | nc = channel_new("accepted auth socket", |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1521 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
| 1522 | c->local_window_max, c->local_maxpacket, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 1523 | 0, "accepted auth socket", 1); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1524 | if (compat20) { |
| 1525 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 1526 | packet_put_cstring("auth-agent@openssh.com"); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1527 | packet_put_int(nc->self); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1528 | packet_put_int(c->local_window_max); |
| 1529 | packet_put_int(c->local_maxpacket); |
| 1530 | } else { |
| 1531 | packet_start(SSH_SMSG_AGENT_OPEN); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1532 | packet_put_int(nc->self); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1533 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1534 | packet_send(); |
| 1535 | } |
| 1536 | } |
| 1537 | |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 1538 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1539 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1540 | channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1541 | { |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 1542 | int err = 0, sock; |
Ben Lindstrom | 1118095 | 2001-07-04 05:13:35 +0000 | [diff] [blame] | 1543 | socklen_t sz = sizeof(err); |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1544 | |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1545 | if (FD_ISSET(c->sock, writeset)) { |
Ben Lindstrom | 733a235 | 2002-03-05 01:31:28 +0000 | [diff] [blame] | 1546 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1547 | err = errno; |
| 1548 | error("getsockopt SO_ERROR failed"); |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1549 | } |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1550 | if (err == 0) { |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 1551 | debug("channel %d: connected to %s port %d", |
| 1552 | c->self, c->connect_ctx.host, c->connect_ctx.port); |
| 1553 | channel_connect_ctx_free(&c->connect_ctx); |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1554 | c->type = SSH_CHANNEL_OPEN; |
| 1555 | if (compat20) { |
| 1556 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1557 | packet_put_int(c->remote_id); |
| 1558 | packet_put_int(c->self); |
| 1559 | packet_put_int(c->local_window); |
| 1560 | packet_put_int(c->local_maxpacket); |
| 1561 | } else { |
| 1562 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1563 | packet_put_int(c->remote_id); |
| 1564 | packet_put_int(c->self); |
| 1565 | } |
| 1566 | } else { |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 1567 | debug("channel %d: connection failed: %s", |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1568 | c->self, strerror(err)); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 1569 | /* Try next address, if any */ |
| 1570 | if ((sock = connect_next(&c->connect_ctx)) > 0) { |
| 1571 | close(c->sock); |
| 1572 | c->sock = c->rfd = c->wfd = sock; |
| 1573 | channel_max_fd = channel_find_maxfd(); |
| 1574 | return; |
| 1575 | } |
| 1576 | /* Exhausted all addresses */ |
| 1577 | error("connect_to %.100s port %d: failed.", |
| 1578 | c->connect_ctx.host, c->connect_ctx.port); |
| 1579 | channel_connect_ctx_free(&c->connect_ctx); |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1580 | if (compat20) { |
| 1581 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
| 1582 | packet_put_int(c->remote_id); |
| 1583 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); |
| 1584 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
| 1585 | packet_put_cstring(strerror(err)); |
| 1586 | packet_put_cstring(""); |
| 1587 | } |
| 1588 | } else { |
| 1589 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 1590 | packet_put_int(c->remote_id); |
| 1591 | } |
| 1592 | chan_mark_dead(c); |
| 1593 | } |
| 1594 | packet_send(); |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1595 | } |
| 1596 | } |
| 1597 | |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 1598 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1599 | static int |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1600 | channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1601 | { |
Darren Tucker | 11327cc | 2005-03-14 23:22:25 +1100 | [diff] [blame] | 1602 | char buf[CHAN_RBUF]; |
Damien Miller | 835284b | 2007-06-11 13:03:16 +1000 | [diff] [blame] | 1603 | int len, force; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1604 | |
Damien Miller | 835284b | 2007-06-11 13:03:16 +1000 | [diff] [blame] | 1605 | force = c->isatty && c->detach_close && c->istate != CHAN_INPUT_CLOSED; |
| 1606 | if (c->rfd != -1 && (force || FD_ISSET(c->rfd, readset))) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 1607 | errno = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1608 | len = read(c->rfd, buf, sizeof(buf)); |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 1609 | if (len < 0 && (errno == EINTR || |
| 1610 | ((errno == EAGAIN || errno == EWOULDBLOCK) && !force))) |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 1611 | return 1; |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 1612 | #ifndef PTY_ZEROREAD |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1613 | if (len <= 0) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 1614 | #else |
Darren Tucker | 144e8d6 | 2006-06-25 08:25:25 +1000 | [diff] [blame] | 1615 | if ((!c->isatty && len <= 0) || |
| 1616 | (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 1617 | #endif |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1618 | debug2("channel %d: read<=0 rfd %d len %d", |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1619 | c->self, c->rfd, len); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1620 | if (c->type != SSH_CHANNEL_OPEN) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1621 | debug2("channel %d: not open", c->self); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1622 | chan_mark_dead(c); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1623 | return -1; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1624 | } else if (compat13) { |
Damien Miller | 76765c0 | 2002-01-22 23:21:15 +1100 | [diff] [blame] | 1625 | buffer_clear(&c->output); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1626 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1627 | debug2("channel %d: input draining.", c->self); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1628 | } else { |
| 1629 | chan_read_failed(c); |
| 1630 | } |
| 1631 | return -1; |
| 1632 | } |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1633 | if (c->input_filter != NULL) { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1634 | if (c->input_filter(c, buf, len) == -1) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1635 | debug2("channel %d: filter stops", c->self); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1636 | chan_read_failed(c); |
| 1637 | } |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1638 | } else if (c->datagram) { |
| 1639 | buffer_put_string(&c->input, buf, len); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1640 | } else { |
| 1641 | buffer_append(&c->input, buf, len); |
| 1642 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1643 | } |
| 1644 | return 1; |
| 1645 | } |
Damien Miller | 4f7becb | 2006-03-26 14:10:14 +1100 | [diff] [blame] | 1646 | |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 1647 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1648 | static int |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1649 | channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1650 | { |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 1651 | struct termios tio; |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 1652 | u_char *data = NULL, *buf; |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 1653 | u_int dlen, olen = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1654 | int len; |
| 1655 | |
| 1656 | /* Send buffered output data to the socket. */ |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 1657 | if (c->wfd != -1 && |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1658 | FD_ISSET(c->wfd, writeset) && |
| 1659 | buffer_len(&c->output) > 0) { |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 1660 | olen = buffer_len(&c->output); |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 1661 | if (c->output_filter != NULL) { |
| 1662 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { |
| 1663 | debug2("channel %d: filter stops", c->self); |
Damien Miller | e204f6a | 2006-01-31 21:47:15 +1100 | [diff] [blame] | 1664 | if (c->type != SSH_CHANNEL_OPEN) |
| 1665 | chan_mark_dead(c); |
| 1666 | else |
| 1667 | chan_write_failed(c); |
| 1668 | return -1; |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 1669 | } |
| 1670 | } else if (c->datagram) { |
| 1671 | buf = data = buffer_get_string(&c->output, &dlen); |
| 1672 | } else { |
| 1673 | buf = data = buffer_ptr(&c->output); |
| 1674 | dlen = buffer_len(&c->output); |
| 1675 | } |
| 1676 | |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1677 | if (c->datagram) { |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1678 | /* ignore truncated writes, datagrams might get lost */ |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 1679 | len = write(c->wfd, buf, dlen); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1680 | xfree(data); |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 1681 | if (len < 0 && (errno == EINTR || errno == EAGAIN || |
| 1682 | errno == EWOULDBLOCK)) |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1683 | return 1; |
| 1684 | if (len <= 0) { |
| 1685 | if (c->type != SSH_CHANNEL_OPEN) |
| 1686 | chan_mark_dead(c); |
| 1687 | else |
| 1688 | chan_write_failed(c); |
| 1689 | return -1; |
| 1690 | } |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 1691 | goto out; |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1692 | } |
Ben Lindstrom | 92ea0ea | 2002-07-04 18:11:09 +0000 | [diff] [blame] | 1693 | #ifdef _AIX |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 1694 | /* XXX: Later AIX versions can't push as much data to tty */ |
Darren Tucker | 240fdfa | 2003-11-22 14:10:02 +1100 | [diff] [blame] | 1695 | if (compat20 && c->wfd_isatty) |
| 1696 | dlen = MIN(dlen, 8*1024); |
Ben Lindstrom | 92ea0ea | 2002-07-04 18:11:09 +0000 | [diff] [blame] | 1697 | #endif |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 1698 | |
| 1699 | len = write(c->wfd, buf, dlen); |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 1700 | if (len < 0 && |
| 1701 | (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 1702 | return 1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1703 | if (len <= 0) { |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1704 | if (c->type != SSH_CHANNEL_OPEN) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1705 | debug2("channel %d: not open", c->self); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1706 | chan_mark_dead(c); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1707 | return -1; |
| 1708 | } else if (compat13) { |
Damien Miller | 76765c0 | 2002-01-22 23:21:15 +1100 | [diff] [blame] | 1709 | buffer_clear(&c->output); |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1710 | debug2("channel %d: input draining.", c->self); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1711 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
| 1712 | } else { |
| 1713 | chan_write_failed(c); |
| 1714 | } |
| 1715 | return -1; |
| 1716 | } |
Darren Tucker | 3980b63 | 2009-08-28 11:02:37 +1000 | [diff] [blame] | 1717 | #ifndef BROKEN_TCGETATTR_ICANON |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 1718 | if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1719 | if (tcgetattr(c->wfd, &tio) == 0 && |
| 1720 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { |
| 1721 | /* |
| 1722 | * Simulate echo to reduce the impact of |
Ben Lindstrom | b40204b | 2001-03-05 06:29:44 +0000 | [diff] [blame] | 1723 | * traffic analysis. We need to match the |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 1724 | * size of a SSH2_MSG_CHANNEL_DATA message |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 1725 | * (4 byte channel id + buf) |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1726 | */ |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 1727 | packet_send_ignore(4 + len); |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1728 | packet_send(); |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1729 | } |
| 1730 | } |
Darren Tucker | 3980b63 | 2009-08-28 11:02:37 +1000 | [diff] [blame] | 1731 | #endif |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1732 | buffer_consume(&c->output, len); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1733 | } |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 1734 | out: |
| 1735 | if (compat20 && olen > 0) |
| 1736 | c->local_consumed += olen - buffer_len(&c->output); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1737 | return 1; |
| 1738 | } |
Damien Miller | 4f7becb | 2006-03-26 14:10:14 +1100 | [diff] [blame] | 1739 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1740 | static int |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1741 | channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1742 | { |
Darren Tucker | 11327cc | 2005-03-14 23:22:25 +1100 | [diff] [blame] | 1743 | char buf[CHAN_RBUF]; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1744 | int len; |
| 1745 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1746 | /** XXX handle drain efd, too */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1747 | if (c->efd != -1) { |
| 1748 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
| 1749 | FD_ISSET(c->efd, writeset) && |
| 1750 | buffer_len(&c->extended) > 0) { |
| 1751 | len = write(c->efd, buffer_ptr(&c->extended), |
| 1752 | buffer_len(&c->extended)); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1753 | debug2("channel %d: written %d to efd %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1754 | c->self, len, c->efd); |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 1755 | if (len < 0 && (errno == EINTR || errno == EAGAIN || |
| 1756 | errno == EWOULDBLOCK)) |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1757 | return 1; |
| 1758 | if (len <= 0) { |
| 1759 | debug2("channel %d: closing write-efd %d", |
| 1760 | c->self, c->efd); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1761 | channel_close_fd(&c->efd); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1762 | } else { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1763 | buffer_consume(&c->extended, len); |
| 1764 | c->local_consumed += len; |
| 1765 | } |
Damien Miller | 8853ca5 | 2010-06-26 10:00:14 +1000 | [diff] [blame] | 1766 | } else if (c->efd != -1 && |
| 1767 | (c->extended_usage == CHAN_EXTENDED_READ || |
| 1768 | c->extended_usage == CHAN_EXTENDED_IGNORE) && |
Damien Miller | e42bd24 | 2007-01-29 10:16:28 +1100 | [diff] [blame] | 1769 | (c->detach_close || FD_ISSET(c->efd, readset))) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1770 | len = read(c->efd, buf, sizeof(buf)); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1771 | debug2("channel %d: read %d from efd %d", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1772 | c->self, len, c->efd); |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 1773 | if (len < 0 && (errno == EINTR || ((errno == EAGAIN || |
| 1774 | errno == EWOULDBLOCK) && !c->detach_close))) |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1775 | return 1; |
| 1776 | if (len <= 0) { |
| 1777 | debug2("channel %d: closing read-efd %d", |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1778 | c->self, c->efd); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1779 | channel_close_fd(&c->efd); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1780 | } else { |
Damien Miller | 8853ca5 | 2010-06-26 10:00:14 +1000 | [diff] [blame] | 1781 | if (c->extended_usage == CHAN_EXTENDED_IGNORE) { |
| 1782 | debug3("channel %d: discard efd", |
| 1783 | c->self); |
| 1784 | } else |
| 1785 | buffer_append(&c->extended, buf, len); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1786 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1787 | } |
| 1788 | } |
| 1789 | return 1; |
| 1790 | } |
Damien Miller | 4f7becb | 2006-03-26 14:10:14 +1100 | [diff] [blame] | 1791 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1792 | static int |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1793 | channel_check_window(Channel *c) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1794 | { |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1795 | if (c->type == SSH_CHANNEL_OPEN && |
| 1796 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && |
Darren Tucker | ae09cb8 | 2007-06-25 19:04:46 +1000 | [diff] [blame] | 1797 | ((c->local_window_max - c->local_window > |
Damien Miller | 3191a8e | 2007-06-11 18:33:15 +1000 | [diff] [blame] | 1798 | c->local_maxpacket*3) || |
| 1799 | c->local_window < c->local_window_max/2) && |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1800 | c->local_consumed > 0) { |
| 1801 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
| 1802 | packet_put_int(c->remote_id); |
| 1803 | packet_put_int(c->local_consumed); |
| 1804 | packet_send(); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1805 | debug2("channel %d: window %d sent adjust %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1806 | c->self, c->local_window, |
| 1807 | c->local_consumed); |
| 1808 | c->local_window += c->local_consumed; |
| 1809 | c->local_consumed = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1810 | } |
| 1811 | return 1; |
| 1812 | } |
| 1813 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1814 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1815 | channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1816 | { |
| 1817 | channel_handle_rfd(c, readset, writeset); |
| 1818 | channel_handle_wfd(c, readset, writeset); |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1819 | if (!compat20) |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1820 | return; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1821 | channel_handle_efd(c, readset, writeset); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1822 | channel_check_window(c); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1823 | } |
| 1824 | |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1825 | static u_int |
| 1826 | read_mux(Channel *c, u_int need) |
| 1827 | { |
| 1828 | char buf[CHAN_RBUF]; |
| 1829 | int len; |
| 1830 | u_int rlen; |
| 1831 | |
| 1832 | if (buffer_len(&c->input) < need) { |
| 1833 | rlen = need - buffer_len(&c->input); |
| 1834 | len = read(c->rfd, buf, MIN(rlen, CHAN_RBUF)); |
| 1835 | if (len <= 0) { |
| 1836 | if (errno != EINTR && errno != EAGAIN) { |
| 1837 | debug2("channel %d: ctl read<=0 rfd %d len %d", |
| 1838 | c->self, c->rfd, len); |
| 1839 | chan_read_failed(c); |
| 1840 | return 0; |
| 1841 | } |
| 1842 | } else |
| 1843 | buffer_append(&c->input, buf, len); |
| 1844 | } |
| 1845 | return buffer_len(&c->input); |
| 1846 | } |
| 1847 | |
| 1848 | static void |
| 1849 | channel_post_mux_client(Channel *c, fd_set *readset, fd_set *writeset) |
| 1850 | { |
| 1851 | u_int need; |
| 1852 | ssize_t len; |
| 1853 | |
| 1854 | if (!compat20) |
| 1855 | fatal("%s: entered with !compat20", __func__); |
| 1856 | |
Damien Miller | d530f5f | 2010-05-21 14:57:10 +1000 | [diff] [blame] | 1857 | if (c->rfd != -1 && !c->mux_pause && FD_ISSET(c->rfd, readset) && |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1858 | (c->istate == CHAN_INPUT_OPEN || |
| 1859 | c->istate == CHAN_INPUT_WAIT_DRAIN)) { |
| 1860 | /* |
| 1861 | * Don't not read past the precise end of packets to |
| 1862 | * avoid disrupting fd passing. |
| 1863 | */ |
| 1864 | if (read_mux(c, 4) < 4) /* read header */ |
| 1865 | return; |
| 1866 | need = get_u32(buffer_ptr(&c->input)); |
| 1867 | #define CHANNEL_MUX_MAX_PACKET (256 * 1024) |
| 1868 | if (need > CHANNEL_MUX_MAX_PACKET) { |
| 1869 | debug2("channel %d: packet too big %u > %u", |
| 1870 | c->self, CHANNEL_MUX_MAX_PACKET, need); |
| 1871 | chan_rcvd_oclose(c); |
| 1872 | return; |
| 1873 | } |
| 1874 | if (read_mux(c, need + 4) < need + 4) /* read body */ |
| 1875 | return; |
| 1876 | if (c->mux_rcb(c) != 0) { |
| 1877 | debug("channel %d: mux_rcb failed", c->self); |
| 1878 | chan_mark_dead(c); |
| 1879 | return; |
| 1880 | } |
| 1881 | } |
| 1882 | |
| 1883 | if (c->wfd != -1 && FD_ISSET(c->wfd, writeset) && |
| 1884 | buffer_len(&c->output) > 0) { |
| 1885 | len = write(c->wfd, buffer_ptr(&c->output), |
| 1886 | buffer_len(&c->output)); |
| 1887 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
| 1888 | return; |
| 1889 | if (len <= 0) { |
| 1890 | chan_mark_dead(c); |
| 1891 | return; |
| 1892 | } |
| 1893 | buffer_consume(&c->output, len); |
| 1894 | } |
| 1895 | } |
| 1896 | |
| 1897 | static void |
| 1898 | channel_post_mux_listener(Channel *c, fd_set *readset, fd_set *writeset) |
| 1899 | { |
| 1900 | Channel *nc; |
| 1901 | struct sockaddr_storage addr; |
| 1902 | socklen_t addrlen; |
| 1903 | int newsock; |
| 1904 | uid_t euid; |
| 1905 | gid_t egid; |
| 1906 | |
| 1907 | if (!FD_ISSET(c->sock, readset)) |
| 1908 | return; |
| 1909 | |
| 1910 | debug("multiplexing control connection"); |
| 1911 | |
| 1912 | /* |
| 1913 | * Accept connection on control socket |
| 1914 | */ |
| 1915 | memset(&addr, 0, sizeof(addr)); |
| 1916 | addrlen = sizeof(addr); |
| 1917 | if ((newsock = accept(c->sock, (struct sockaddr*)&addr, |
| 1918 | &addrlen)) == -1) { |
| 1919 | error("%s accept: %s", __func__, strerror(errno)); |
| 1920 | return; |
| 1921 | } |
| 1922 | |
| 1923 | if (getpeereid(newsock, &euid, &egid) < 0) { |
| 1924 | error("%s getpeereid failed: %s", __func__, |
| 1925 | strerror(errno)); |
| 1926 | close(newsock); |
| 1927 | return; |
| 1928 | } |
| 1929 | if ((euid != 0) && (getuid() != euid)) { |
| 1930 | error("multiplex uid mismatch: peer euid %u != uid %u", |
| 1931 | (u_int)euid, (u_int)getuid()); |
| 1932 | close(newsock); |
| 1933 | return; |
| 1934 | } |
| 1935 | nc = channel_new("multiplex client", SSH_CHANNEL_MUX_CLIENT, |
| 1936 | newsock, newsock, -1, c->local_window_max, |
| 1937 | c->local_maxpacket, 0, "mux-control", 1); |
| 1938 | nc->mux_rcb = c->mux_rcb; |
| 1939 | debug3("%s: new mux channel %d fd %d", __func__, |
| 1940 | nc->self, nc->sock); |
| 1941 | /* establish state */ |
| 1942 | nc->mux_rcb(nc); |
| 1943 | /* mux state transitions must not elicit protocol messages */ |
| 1944 | nc->flags |= CHAN_LOCAL; |
| 1945 | } |
| 1946 | |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 1947 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1948 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1949 | channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1950 | { |
| 1951 | int len; |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 1952 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1953 | /* Send buffered output data to the socket. */ |
| 1954 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { |
| 1955 | len = write(c->sock, buffer_ptr(&c->output), |
| 1956 | buffer_len(&c->output)); |
| 1957 | if (len <= 0) |
Damien Miller | 76765c0 | 2002-01-22 23:21:15 +1100 | [diff] [blame] | 1958 | buffer_clear(&c->output); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1959 | else |
| 1960 | buffer_consume(&c->output, len); |
| 1961 | } |
| 1962 | } |
| 1963 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1964 | static void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1965 | channel_handler_init_20(void) |
| 1966 | { |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1967 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1968 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1969 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1970 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1971 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1972 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1973 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1974 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1975 | channel_pre[SSH_CHANNEL_MUX_LISTENER] = &channel_pre_listener; |
| 1976 | channel_pre[SSH_CHANNEL_MUX_CLIENT] = &channel_pre_mux_client; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1977 | |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1978 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1979 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1980 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1981 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1982 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1983 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1984 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1985 | channel_post[SSH_CHANNEL_MUX_LISTENER] = &channel_post_mux_listener; |
| 1986 | channel_post[SSH_CHANNEL_MUX_CLIENT] = &channel_post_mux_client; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1987 | } |
| 1988 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1989 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1990 | channel_handler_init_13(void) |
| 1991 | { |
| 1992 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; |
| 1993 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; |
| 1994 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
| 1995 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
| 1996 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
| 1997 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; |
| 1998 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1999 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 2000 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2001 | |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 2002 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2003 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
| 2004 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
| 2005 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
| 2006 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 2007 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 2008 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2009 | } |
| 2010 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2011 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2012 | channel_handler_init_15(void) |
| 2013 | { |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 2014 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2015 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2016 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
| 2017 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
| 2018 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 2019 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 2020 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2021 | |
| 2022 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
| 2023 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
| 2024 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 2025 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 2026 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 2027 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2028 | } |
| 2029 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2030 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2031 | channel_handler_init(void) |
| 2032 | { |
| 2033 | int i; |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 2034 | |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 2035 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2036 | channel_pre[i] = NULL; |
| 2037 | channel_post[i] = NULL; |
| 2038 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2039 | if (compat20) |
| 2040 | channel_handler_init_20(); |
| 2041 | else if (compat13) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2042 | channel_handler_init_13(); |
| 2043 | else |
| 2044 | channel_handler_init_15(); |
| 2045 | } |
| 2046 | |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2047 | /* gc dead channels */ |
| 2048 | static void |
| 2049 | channel_garbage_collect(Channel *c) |
| 2050 | { |
| 2051 | if (c == NULL) |
| 2052 | return; |
| 2053 | if (c->detach_user != NULL) { |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 2054 | if (!chan_is_dead(c, c->detach_close)) |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2055 | return; |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 2056 | debug2("channel %d: gc: notify user", c->self); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2057 | c->detach_user(c->self, NULL); |
| 2058 | /* if we still have a callback */ |
| 2059 | if (c->detach_user != NULL) |
| 2060 | return; |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 2061 | debug2("channel %d: gc: user detached", c->self); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2062 | } |
| 2063 | if (!chan_is_dead(c, 1)) |
| 2064 | return; |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 2065 | debug2("channel %d: garbage collecting", c->self); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2066 | channel_free(c); |
| 2067 | } |
| 2068 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2069 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 2070 | channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2071 | { |
| 2072 | static int did_init = 0; |
Darren Tucker | 876045b | 2010-01-08 17:08:00 +1100 | [diff] [blame] | 2073 | u_int i, oalloc; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2074 | Channel *c; |
| 2075 | |
| 2076 | if (!did_init) { |
| 2077 | channel_handler_init(); |
| 2078 | did_init = 1; |
| 2079 | } |
Darren Tucker | 876045b | 2010-01-08 17:08:00 +1100 | [diff] [blame] | 2080 | for (i = 0, oalloc = channels_alloc; i < oalloc; i++) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2081 | c = channels[i]; |
| 2082 | if (c == NULL) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2083 | continue; |
Darren Tucker | 876045b | 2010-01-08 17:08:00 +1100 | [diff] [blame] | 2084 | if (c->delayed) { |
| 2085 | if (ftab == channel_pre) |
| 2086 | c->delayed = 0; |
| 2087 | else |
| 2088 | continue; |
| 2089 | } |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 2090 | if (ftab[c->type] != NULL) |
| 2091 | (*ftab[c->type])(c, readset, writeset); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2092 | channel_garbage_collect(c); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2093 | } |
| 2094 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2095 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2096 | /* |
| 2097 | * Allocate/update select bitmasks and add any bits relevant to channels in |
| 2098 | * select bitmasks. |
| 2099 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2100 | void |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 2101 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 2102 | u_int *nallocp, int rekeying) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2103 | { |
Damien Miller | 3681209 | 2006-03-26 14:22:47 +1100 | [diff] [blame] | 2104 | u_int n, sz, nfdset; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 2105 | |
| 2106 | n = MAX(*maxfdp, channel_max_fd); |
| 2107 | |
Damien Miller | 3681209 | 2006-03-26 14:22:47 +1100 | [diff] [blame] | 2108 | nfdset = howmany(n+1, NFDBITS); |
| 2109 | /* Explicitly test here, because xrealloc isn't always called */ |
| 2110 | if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask)) |
| 2111 | fatal("channel_prepare_select: max_fd (%d) is too large", n); |
| 2112 | sz = nfdset * sizeof(fd_mask); |
| 2113 | |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 2114 | /* perhaps check sz < nalloc/2 and shrink? */ |
| 2115 | if (*readsetp == NULL || sz > *nallocp) { |
Damien Miller | 3681209 | 2006-03-26 14:22:47 +1100 | [diff] [blame] | 2116 | *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask)); |
| 2117 | *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask)); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 2118 | *nallocp = sz; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 2119 | } |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 2120 | *maxfdp = n; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 2121 | memset(*readsetp, 0, sz); |
| 2122 | memset(*writesetp, 0, sz); |
| 2123 | |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 2124 | if (!rekeying) |
| 2125 | channel_handler(channel_pre, *readsetp, *writesetp); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2126 | } |
| 2127 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2128 | /* |
| 2129 | * After select, perform any appropriate operations for channels which have |
| 2130 | * events pending. |
| 2131 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2132 | void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 2133 | channel_after_select(fd_set *readset, fd_set *writeset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2134 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2135 | channel_handler(channel_post, readset, writeset); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2136 | } |
| 2137 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2138 | |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 2139 | /* If there is data to send to the connection, enqueue some of it now. */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2140 | void |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 2141 | channel_output_poll(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2142 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2143 | Channel *c; |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 2144 | u_int i, len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2145 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2146 | for (i = 0; i < channels_alloc; i++) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2147 | c = channels[i]; |
| 2148 | if (c == NULL) |
| 2149 | continue; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2150 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2151 | /* |
| 2152 | * We are only interested in channels that can have buffered |
| 2153 | * incoming data. |
| 2154 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2155 | if (compat13) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2156 | if (c->type != SSH_CHANNEL_OPEN && |
| 2157 | c->type != SSH_CHANNEL_INPUT_DRAINING) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2158 | continue; |
| 2159 | } else { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2160 | if (c->type != SSH_CHANNEL_OPEN) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2161 | continue; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2162 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2163 | if (compat20 && |
| 2164 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 2165 | /* XXX is this true? */ |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2166 | debug3("channel %d: will not send data after close", c->self); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2167 | continue; |
| 2168 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2169 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2170 | /* Get the amount of buffered data for this channel. */ |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 2171 | if ((c->istate == CHAN_INPUT_OPEN || |
| 2172 | c->istate == CHAN_INPUT_WAIT_DRAIN) && |
| 2173 | (len = buffer_len(&c->input)) > 0) { |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 2174 | if (c->datagram) { |
| 2175 | if (len > 0) { |
| 2176 | u_char *data; |
| 2177 | u_int dlen; |
| 2178 | |
| 2179 | data = buffer_get_string(&c->input, |
| 2180 | &dlen); |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 2181 | if (dlen > c->remote_window || |
| 2182 | dlen > c->remote_maxpacket) { |
| 2183 | debug("channel %d: datagram " |
| 2184 | "too big for channel", |
| 2185 | c->self); |
| 2186 | xfree(data); |
| 2187 | continue; |
| 2188 | } |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 2189 | packet_start(SSH2_MSG_CHANNEL_DATA); |
| 2190 | packet_put_int(c->remote_id); |
| 2191 | packet_put_string(data, dlen); |
| 2192 | packet_send(); |
| 2193 | c->remote_window -= dlen + 4; |
| 2194 | xfree(data); |
| 2195 | } |
| 2196 | continue; |
| 2197 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2198 | /* |
| 2199 | * Send some data for the other side over the secure |
| 2200 | * connection. |
| 2201 | */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2202 | if (compat20) { |
| 2203 | if (len > c->remote_window) |
| 2204 | len = c->remote_window; |
| 2205 | if (len > c->remote_maxpacket) |
| 2206 | len = c->remote_maxpacket; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2207 | } else { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2208 | if (packet_is_interactive()) { |
| 2209 | if (len > 1024) |
| 2210 | len = 512; |
| 2211 | } else { |
| 2212 | /* Keep the packets at reasonable size. */ |
| 2213 | if (len > packet_get_maxsize()/2) |
| 2214 | len = packet_get_maxsize()/2; |
| 2215 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2216 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2217 | if (len > 0) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2218 | packet_start(compat20 ? |
| 2219 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2220 | packet_put_int(c->remote_id); |
| 2221 | packet_put_string(buffer_ptr(&c->input), len); |
| 2222 | packet_send(); |
| 2223 | buffer_consume(&c->input, len); |
| 2224 | c->remote_window -= len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2225 | } |
| 2226 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2227 | if (compat13) |
| 2228 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2229 | /* |
| 2230 | * input-buffer is empty and read-socket shutdown: |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 2231 | * tell peer, that we will not send more data: send IEOF. |
| 2232 | * hack for extended data: delay EOF if EFD still in use. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2233 | */ |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 2234 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
Damien Miller | 0dc1bef | 2005-07-17 17:22:45 +1000 | [diff] [blame] | 2235 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
| 2236 | c->self, c->efd, buffer_len(&c->extended)); |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 2237 | else |
| 2238 | chan_ibuf_empty(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2239 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2240 | /* Send extended data, i.e. stderr */ |
| 2241 | if (compat20 && |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 2242 | !(c->flags & CHAN_EOF_SENT) && |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2243 | c->remote_window > 0 && |
| 2244 | (len = buffer_len(&c->extended)) > 0 && |
| 2245 | c->extended_usage == CHAN_EXTENDED_READ) { |
Ben Lindstrom | 4fed2be | 2002-06-25 23:17:36 +0000 | [diff] [blame] | 2246 | debug2("channel %d: rwin %u elen %u euse %d", |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 2247 | c->self, c->remote_window, buffer_len(&c->extended), |
| 2248 | c->extended_usage); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2249 | if (len > c->remote_window) |
| 2250 | len = c->remote_window; |
| 2251 | if (len > c->remote_maxpacket) |
| 2252 | len = c->remote_maxpacket; |
| 2253 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); |
| 2254 | packet_put_int(c->remote_id); |
| 2255 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); |
| 2256 | packet_put_string(buffer_ptr(&c->extended), len); |
| 2257 | packet_send(); |
| 2258 | buffer_consume(&c->extended, len); |
| 2259 | c->remote_window -= len; |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 2260 | debug2("channel %d: sent ext data %d", c->self, len); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2261 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2262 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2263 | } |
| 2264 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2265 | |
| 2266 | /* -- protocol input */ |
Damien Miller | d79b424 | 2006-03-31 23:11:44 +1100 | [diff] [blame] | 2267 | |
| 2268 | /* ARGSUSED */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2269 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2270 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2271 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2272 | int id; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2273 | char *data; |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 2274 | u_int data_len, win_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2275 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2276 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2277 | /* Get the channel number and verify it. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2278 | id = packet_get_int(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2279 | c = channel_lookup(id); |
| 2280 | if (c == NULL) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2281 | packet_disconnect("Received data for nonexistent channel %d.", id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2282 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2283 | /* Ignore any data for non-open channels (might happen on close) */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2284 | if (c->type != SSH_CHANNEL_OPEN && |
| 2285 | c->type != SSH_CHANNEL_X11_OPEN) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2286 | return; |
| 2287 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2288 | /* Get the data. */ |
Damien Miller | db255ca | 2008-05-19 14:59:37 +1000 | [diff] [blame] | 2289 | data = packet_get_string_ptr(&data_len); |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 2290 | win_len = data_len; |
| 2291 | if (c->datagram) |
| 2292 | win_len += 4; /* string length header */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2293 | |
Damien Miller | a04ad49 | 2004-01-21 11:02:09 +1100 | [diff] [blame] | 2294 | /* |
| 2295 | * Ignore data for protocol > 1.3 if output end is no longer open. |
| 2296 | * For protocol 2 the sending side is reducing its window as it sends |
| 2297 | * data, so we must 'fake' consumption of the data in order to ensure |
| 2298 | * that window updates are sent back. Otherwise the connection might |
| 2299 | * deadlock. |
| 2300 | */ |
| 2301 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { |
| 2302 | if (compat20) { |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 2303 | c->local_window -= win_len; |
| 2304 | c->local_consumed += win_len; |
Damien Miller | a04ad49 | 2004-01-21 11:02:09 +1100 | [diff] [blame] | 2305 | } |
Damien Miller | a04ad49 | 2004-01-21 11:02:09 +1100 | [diff] [blame] | 2306 | return; |
| 2307 | } |
| 2308 | |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 2309 | if (compat20) { |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 2310 | if (win_len > c->local_maxpacket) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 2311 | logit("channel %d: rcvd big packet %d, maxpack %d", |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 2312 | c->self, win_len, c->local_maxpacket); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2313 | } |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 2314 | if (win_len > c->local_window) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 2315 | logit("channel %d: rcvd too much data %d, win %d", |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 2316 | c->self, win_len, c->local_window); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2317 | return; |
| 2318 | } |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 2319 | c->local_window -= win_len; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2320 | } |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 2321 | if (c->datagram) |
| 2322 | buffer_put_string(&c->output, data, data_len); |
| 2323 | else |
| 2324 | buffer_append(&c->output, data, data_len); |
Damien Miller | db255ca | 2008-05-19 14:59:37 +1000 | [diff] [blame] | 2325 | packet_check_eom(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2326 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2327 | |
Damien Miller | d79b424 | 2006-03-31 23:11:44 +1100 | [diff] [blame] | 2328 | /* ARGSUSED */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2329 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2330 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2331 | { |
| 2332 | int id; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2333 | char *data; |
Ben Lindstrom | daa2179 | 2002-06-25 23:15:30 +0000 | [diff] [blame] | 2334 | u_int data_len, tcode; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2335 | Channel *c; |
| 2336 | |
| 2337 | /* Get the channel number and verify it. */ |
| 2338 | id = packet_get_int(); |
| 2339 | c = channel_lookup(id); |
| 2340 | |
| 2341 | if (c == NULL) |
| 2342 | packet_disconnect("Received extended_data for bad channel %d.", id); |
| 2343 | if (c->type != SSH_CHANNEL_OPEN) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 2344 | logit("channel %d: ext data for non open", id); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2345 | return; |
| 2346 | } |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 2347 | if (c->flags & CHAN_EOF_RCVD) { |
| 2348 | if (datafellows & SSH_BUG_EXTEOF) |
| 2349 | debug("channel %d: accepting ext data after eof", id); |
| 2350 | else |
| 2351 | packet_disconnect("Received extended_data after EOF " |
| 2352 | "on channel %d.", id); |
| 2353 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2354 | tcode = packet_get_int(); |
| 2355 | if (c->efd == -1 || |
| 2356 | c->extended_usage != CHAN_EXTENDED_WRITE || |
| 2357 | tcode != SSH2_EXTENDED_DATA_STDERR) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 2358 | logit("channel %d: bad ext data", c->self); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2359 | return; |
| 2360 | } |
| 2361 | data = packet_get_string(&data_len); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2362 | packet_check_eom(); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2363 | if (data_len > c->local_window) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 2364 | logit("channel %d: rcvd too much extended_data %d, win %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2365 | c->self, data_len, c->local_window); |
| 2366 | xfree(data); |
| 2367 | return; |
| 2368 | } |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 2369 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2370 | c->local_window -= data_len; |
| 2371 | buffer_append(&c->extended, data, data_len); |
| 2372 | xfree(data); |
| 2373 | } |
| 2374 | |
Damien Miller | d79b424 | 2006-03-31 23:11:44 +1100 | [diff] [blame] | 2375 | /* ARGSUSED */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2376 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2377 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2378 | { |
| 2379 | int id; |
| 2380 | Channel *c; |
| 2381 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2382 | id = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2383 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2384 | c = channel_lookup(id); |
| 2385 | if (c == NULL) |
| 2386 | packet_disconnect("Received ieof for nonexistent channel %d.", id); |
| 2387 | chan_rcvd_ieof(c); |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 2388 | |
| 2389 | /* XXX force input close */ |
Damien Miller | a90fc08 | 2002-01-22 23:19:38 +1100 | [diff] [blame] | 2390 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 2391 | debug("channel %d: FORCE input drain", c->self); |
| 2392 | c->istate = CHAN_INPUT_WAIT_DRAIN; |
Damien Miller | 73f1074 | 2002-01-22 23:34:52 +1100 | [diff] [blame] | 2393 | if (buffer_len(&c->input) == 0) |
| 2394 | chan_ibuf_empty(c); |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 2395 | } |
| 2396 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2397 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2398 | |
Damien Miller | d79b424 | 2006-03-31 23:11:44 +1100 | [diff] [blame] | 2399 | /* ARGSUSED */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2400 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2401 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2402 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2403 | int id; |
| 2404 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2405 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2406 | id = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2407 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2408 | c = channel_lookup(id); |
| 2409 | if (c == NULL) |
| 2410 | packet_disconnect("Received close for nonexistent channel %d.", id); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2411 | |
| 2412 | /* |
| 2413 | * Send a confirmation that we have closed the channel and no more |
| 2414 | * data is coming for it. |
| 2415 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2416 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2417 | packet_put_int(c->remote_id); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2418 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2419 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2420 | /* |
| 2421 | * If the channel is in closed state, we have sent a close request, |
| 2422 | * and the other side will eventually respond with a confirmation. |
| 2423 | * Thus, we cannot free the channel here, because then there would be |
| 2424 | * no-one to receive the confirmation. The channel gets freed when |
| 2425 | * the confirmation arrives. |
| 2426 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2427 | if (c->type != SSH_CHANNEL_CLOSED) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2428 | /* |
| 2429 | * Not a closed channel - mark it as draining, which will |
| 2430 | * cause it to be freed later. |
| 2431 | */ |
Damien Miller | 76765c0 | 2002-01-22 23:21:15 +1100 | [diff] [blame] | 2432 | buffer_clear(&c->input); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2433 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2434 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2435 | } |
| 2436 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2437 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
Damien Miller | d79b424 | 2006-03-31 23:11:44 +1100 | [diff] [blame] | 2438 | /* ARGSUSED */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2439 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2440 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2441 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2442 | int id = packet_get_int(); |
| 2443 | Channel *c = channel_lookup(id); |
Damien Miller | 66823cd | 2002-01-22 23:11:38 +1100 | [diff] [blame] | 2444 | |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2445 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2446 | if (c == NULL) |
| 2447 | packet_disconnect("Received oclose for nonexistent channel %d.", id); |
| 2448 | chan_rcvd_oclose(c); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2449 | } |
| 2450 | |
Damien Miller | d79b424 | 2006-03-31 23:11:44 +1100 | [diff] [blame] | 2451 | /* ARGSUSED */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2452 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2453 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2454 | { |
| 2455 | int id = packet_get_int(); |
| 2456 | Channel *c = channel_lookup(id); |
| 2457 | |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2458 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2459 | if (c == NULL) |
| 2460 | packet_disconnect("Received close confirmation for " |
| 2461 | "out-of-range channel %d.", id); |
| 2462 | if (c->type != SSH_CHANNEL_CLOSED) |
| 2463 | packet_disconnect("Received close confirmation for " |
| 2464 | "non-closed channel %d (type %d).", id, c->type); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2465 | channel_free(c); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2466 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2467 | |
Damien Miller | d79b424 | 2006-03-31 23:11:44 +1100 | [diff] [blame] | 2468 | /* ARGSUSED */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2469 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2470 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2471 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2472 | int id, remote_id; |
| 2473 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2474 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2475 | id = packet_get_int(); |
| 2476 | c = channel_lookup(id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2477 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2478 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
| 2479 | packet_disconnect("Received open confirmation for " |
| 2480 | "non-opening channel %d.", id); |
| 2481 | remote_id = packet_get_int(); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2482 | /* 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] | 2483 | c->remote_id = remote_id; |
| 2484 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2485 | |
| 2486 | if (compat20) { |
| 2487 | c->remote_window = packet_get_int(); |
| 2488 | c->remote_maxpacket = packet_get_int(); |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 2489 | if (c->open_confirm) { |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 2490 | debug2("callback start"); |
Damien Miller | d530f5f | 2010-05-21 14:57:10 +1000 | [diff] [blame] | 2491 | c->open_confirm(c->self, 1, c->open_confirm_ctx); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 2492 | debug2("callback done"); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2493 | } |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 2494 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2495 | c->remote_window, c->remote_maxpacket); |
| 2496 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2497 | packet_check_eom(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2498 | } |
| 2499 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2500 | static char * |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 2501 | reason2txt(int reason) |
| 2502 | { |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 2503 | switch (reason) { |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 2504 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
| 2505 | return "administratively prohibited"; |
| 2506 | case SSH2_OPEN_CONNECT_FAILED: |
| 2507 | return "connect failed"; |
| 2508 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: |
| 2509 | return "unknown channel type"; |
| 2510 | case SSH2_OPEN_RESOURCE_SHORTAGE: |
| 2511 | return "resource shortage"; |
| 2512 | } |
Ben Lindstrom | e259544 | 2001-06-05 20:01:39 +0000 | [diff] [blame] | 2513 | return "unknown reason"; |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 2514 | } |
| 2515 | |
Damien Miller | d79b424 | 2006-03-31 23:11:44 +1100 | [diff] [blame] | 2516 | /* ARGSUSED */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2517 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2518 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2519 | { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2520 | int id, reason; |
| 2521 | char *msg = NULL, *lang = NULL; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2522 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2523 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2524 | id = packet_get_int(); |
| 2525 | c = channel_lookup(id); |
| 2526 | |
| 2527 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
| 2528 | packet_disconnect("Received open failure for " |
| 2529 | "non-opening channel %d.", id); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2530 | if (compat20) { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2531 | reason = packet_get_int(); |
Ben Lindstrom | f343674 | 2001-04-29 19:52:00 +0000 | [diff] [blame] | 2532 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2533 | msg = packet_get_string(NULL); |
| 2534 | lang = packet_get_string(NULL); |
| 2535 | } |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 2536 | logit("channel %d: open failed: %s%s%s", id, |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 2537 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2538 | if (msg != NULL) |
| 2539 | xfree(msg); |
| 2540 | if (lang != NULL) |
| 2541 | xfree(lang); |
Damien Miller | d530f5f | 2010-05-21 14:57:10 +1000 | [diff] [blame] | 2542 | if (c->open_confirm) { |
| 2543 | debug2("callback start"); |
| 2544 | c->open_confirm(c->self, 0, c->open_confirm_ctx); |
| 2545 | debug2("callback done"); |
| 2546 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2547 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2548 | packet_check_eom(); |
Damien Miller | 7a60621 | 2009-01-28 16:22:34 +1100 | [diff] [blame] | 2549 | /* Schedule the channel for cleanup/deletion. */ |
| 2550 | chan_mark_dead(c); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2551 | } |
| 2552 | |
Damien Miller | d79b424 | 2006-03-31 23:11:44 +1100 | [diff] [blame] | 2553 | /* ARGSUSED */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2554 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2555 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2556 | { |
| 2557 | Channel *c; |
Ben Lindstrom | 4fed2be | 2002-06-25 23:17:36 +0000 | [diff] [blame] | 2558 | int id; |
| 2559 | u_int adjust; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2560 | |
| 2561 | if (!compat20) |
| 2562 | return; |
| 2563 | |
| 2564 | /* Get the channel number and verify it. */ |
| 2565 | id = packet_get_int(); |
| 2566 | c = channel_lookup(id); |
| 2567 | |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 2568 | if (c == NULL) { |
| 2569 | logit("Received window adjust for non-open channel %d.", id); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2570 | return; |
| 2571 | } |
| 2572 | adjust = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2573 | packet_check_eom(); |
Ben Lindstrom | 4fed2be | 2002-06-25 23:17:36 +0000 | [diff] [blame] | 2574 | debug2("channel %d: rcvd adjust %u", id, adjust); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2575 | c->remote_window += adjust; |
| 2576 | } |
| 2577 | |
Damien Miller | d79b424 | 2006-03-31 23:11:44 +1100 | [diff] [blame] | 2578 | /* ARGSUSED */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2579 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2580 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2581 | { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2582 | Channel *c = NULL; |
| 2583 | u_short host_port; |
| 2584 | char *host, *originator_string; |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 2585 | int remote_id; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2586 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2587 | remote_id = packet_get_int(); |
| 2588 | host = packet_get_string(NULL); |
| 2589 | host_port = packet_get_int(); |
| 2590 | |
| 2591 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { |
| 2592 | originator_string = packet_get_string(NULL); |
| 2593 | } else { |
| 2594 | originator_string = xstrdup("unknown (remote did not supply name)"); |
| 2595 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2596 | packet_check_eom(); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 2597 | c = channel_connect_to(host, host_port, |
| 2598 | "connected socket", originator_string); |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 2599 | xfree(originator_string); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 2600 | xfree(host); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2601 | if (c == NULL) { |
| 2602 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 2603 | packet_put_int(remote_id); |
| 2604 | packet_send(); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 2605 | } else |
| 2606 | c->remote_id = remote_id; |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 2607 | } |
| 2608 | |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 2609 | /* ARGSUSED */ |
| 2610 | void |
| 2611 | channel_input_status_confirm(int type, u_int32_t seq, void *ctxt) |
| 2612 | { |
| 2613 | Channel *c; |
| 2614 | struct channel_confirm *cc; |
Damien Miller | 16a7307 | 2008-12-08 09:55:25 +1100 | [diff] [blame] | 2615 | int id; |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 2616 | |
| 2617 | /* Reset keepalive timeout */ |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2618 | packet_set_alive_timeouts(0); |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 2619 | |
Damien Miller | 16a7307 | 2008-12-08 09:55:25 +1100 | [diff] [blame] | 2620 | id = packet_get_int(); |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 2621 | packet_check_eom(); |
| 2622 | |
Damien Miller | 16a7307 | 2008-12-08 09:55:25 +1100 | [diff] [blame] | 2623 | debug2("channel_input_status_confirm: type %d id %d", type, id); |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 2624 | |
Damien Miller | 16a7307 | 2008-12-08 09:55:25 +1100 | [diff] [blame] | 2625 | if ((c = channel_lookup(id)) == NULL) { |
| 2626 | logit("channel_input_status_confirm: %d: unknown", id); |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 2627 | return; |
| 2628 | } |
| 2629 | ; |
| 2630 | if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL) |
| 2631 | return; |
| 2632 | cc->cb(type, c, cc->ctx); |
| 2633 | TAILQ_REMOVE(&c->status_confirms, cc, entry); |
| 2634 | bzero(cc, sizeof(*cc)); |
| 2635 | xfree(cc); |
| 2636 | } |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 2637 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2638 | /* -- tcp forwarding */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2639 | |
Ben Lindstrom | 908afed | 2001-10-03 17:34:59 +0000 | [diff] [blame] | 2640 | void |
| 2641 | channel_set_af(int af) |
| 2642 | { |
| 2643 | IPv4or6 = af; |
| 2644 | } |
| 2645 | |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2646 | |
| 2647 | /* |
| 2648 | * Determine whether or not a port forward listens to loopback, the |
| 2649 | * specified address or wildcard. On the client, a specified bind |
| 2650 | * address will always override gateway_ports. On the server, a |
| 2651 | * gateway_ports of 1 (``yes'') will override the client's specification |
| 2652 | * and force a wildcard bind, whereas a value of 2 (``clientspecified'') |
| 2653 | * will bind to whatever address the client asked for. |
| 2654 | * |
| 2655 | * Special-case listen_addrs are: |
| 2656 | * |
| 2657 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR |
| 2658 | * "" (empty string), "*" -> wildcard v4/v6 |
| 2659 | * "localhost" -> loopback v4/v6 |
| 2660 | */ |
| 2661 | static const char * |
| 2662 | channel_fwd_bind_addr(const char *listen_addr, int *wildcardp, |
| 2663 | int is_client, int gateway_ports) |
| 2664 | { |
| 2665 | const char *addr = NULL; |
| 2666 | int wildcard = 0; |
| 2667 | |
| 2668 | if (listen_addr == NULL) { |
| 2669 | /* No address specified: default to gateway_ports setting */ |
| 2670 | if (gateway_ports) |
| 2671 | wildcard = 1; |
| 2672 | } else if (gateway_ports || is_client) { |
| 2673 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && |
| 2674 | strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) || |
| 2675 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || |
| 2676 | (!is_client && gateway_ports == 1)) |
| 2677 | wildcard = 1; |
| 2678 | else if (strcmp(listen_addr, "localhost") != 0) |
| 2679 | addr = listen_addr; |
| 2680 | } |
| 2681 | if (wildcardp != NULL) |
| 2682 | *wildcardp = wildcard; |
| 2683 | return addr; |
| 2684 | } |
| 2685 | |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2686 | static int |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 2687 | channel_setup_fwd_listener(int type, const char *listen_addr, |
| 2688 | u_short listen_port, int *allocated_listen_port, |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2689 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2690 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2691 | Channel *c; |
Damien Miller | 5e7fd07 | 2005-11-05 14:53:39 +1100 | [diff] [blame] | 2692 | int sock, r, success = 0, wildcard = 0, is_client; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2693 | struct addrinfo hints, *ai, *aitop; |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2694 | const char *host, *addr; |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2695 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 2696 | in_port_t *lport_p; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2697 | |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2698 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
| 2699 | listen_addr : host_to_connect; |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2700 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2701 | |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2702 | if (host == NULL) { |
| 2703 | error("No forward host name."); |
Damien Miller | a727030 | 2005-07-06 09:36:05 +1000 | [diff] [blame] | 2704 | return 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2705 | } |
Damien Miller | 9576ac4 | 2009-01-28 16:30:33 +1100 | [diff] [blame] | 2706 | if (strlen(host) >= NI_MAXHOST) { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2707 | error("Forward host name too long."); |
Damien Miller | a727030 | 2005-07-06 09:36:05 +1000 | [diff] [blame] | 2708 | return 0; |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2709 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2710 | |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2711 | /* Determine the bind address, cf. channel_fwd_bind_addr() comment */ |
| 2712 | addr = channel_fwd_bind_addr(listen_addr, &wildcard, |
| 2713 | is_client, gateway_ports); |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2714 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", |
| 2715 | type, wildcard, (addr == NULL) ? "NULL" : addr); |
| 2716 | |
| 2717 | /* |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2718 | * getaddrinfo returns a loopback address if the hostname is |
| 2719 | * set to NULL and hints.ai_flags is not AI_PASSIVE |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2720 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2721 | memset(&hints, 0, sizeof(hints)); |
| 2722 | hints.ai_family = IPv4or6; |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2723 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2724 | hints.ai_socktype = SOCK_STREAM; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2725 | snprintf(strport, sizeof strport, "%d", listen_port); |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2726 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
| 2727 | if (addr == NULL) { |
| 2728 | /* This really shouldn't happen */ |
| 2729 | packet_disconnect("getaddrinfo: fatal error: %s", |
Darren Tucker | 4abde77 | 2007-12-29 02:43:51 +1100 | [diff] [blame] | 2730 | ssh_gai_strerror(r)); |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2731 | } else { |
Damien Miller | a727030 | 2005-07-06 09:36:05 +1000 | [diff] [blame] | 2732 | error("channel_setup_fwd_listener: " |
Darren Tucker | 4abde77 | 2007-12-29 02:43:51 +1100 | [diff] [blame] | 2733 | "getaddrinfo(%.64s): %s", addr, |
| 2734 | ssh_gai_strerror(r)); |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2735 | } |
Damien Miller | a727030 | 2005-07-06 09:36:05 +1000 | [diff] [blame] | 2736 | return 0; |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2737 | } |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 2738 | if (allocated_listen_port != NULL) |
| 2739 | *allocated_listen_port = 0; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2740 | for (ai = aitop; ai; ai = ai->ai_next) { |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 2741 | switch (ai->ai_family) { |
| 2742 | case AF_INET: |
| 2743 | lport_p = &((struct sockaddr_in *)ai->ai_addr)-> |
| 2744 | sin_port; |
| 2745 | break; |
| 2746 | case AF_INET6: |
| 2747 | lport_p = &((struct sockaddr_in6 *)ai->ai_addr)-> |
| 2748 | sin6_port; |
| 2749 | break; |
| 2750 | default: |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2751 | continue; |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 2752 | } |
| 2753 | /* |
| 2754 | * If allocating a port for -R forwards, then use the |
| 2755 | * same port for all address families. |
| 2756 | */ |
| 2757 | if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 && |
| 2758 | allocated_listen_port != NULL && *allocated_listen_port > 0) |
| 2759 | *lport_p = htons(*allocated_listen_port); |
| 2760 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2761 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
| 2762 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2763 | error("channel_setup_fwd_listener: getnameinfo failed"); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2764 | continue; |
| 2765 | } |
| 2766 | /* Create a port to listen for the host. */ |
Darren Tucker | 7bd98e7 | 2010-01-10 10:31:12 +1100 | [diff] [blame] | 2767 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2768 | if (sock < 0) { |
| 2769 | /* this is no error since kernel may not support ipv6 */ |
| 2770 | verbose("socket: %.100s", strerror(errno)); |
| 2771 | continue; |
| 2772 | } |
Damien Miller | 5e7fd07 | 2005-11-05 14:53:39 +1100 | [diff] [blame] | 2773 | |
| 2774 | channel_set_reuseaddr(sock); |
Damien Miller | 04ee0f8 | 2009-11-18 17:48:30 +1100 | [diff] [blame] | 2775 | if (ai->ai_family == AF_INET6) |
| 2776 | sock_set_v6only(sock); |
Damien Miller | e1383ce | 2002-09-19 11:49:37 +1000 | [diff] [blame] | 2777 | |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 2778 | debug("Local forwarding listening on %s port %s.", |
| 2779 | ntop, strport); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2780 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2781 | /* Bind the socket to the address. */ |
| 2782 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 2783 | /* address can be in use ipv6 address is already bound */ |
Damien Miller | 3c7eeb2 | 2000-03-03 22:35:33 +1100 | [diff] [blame] | 2784 | if (!ai->ai_next) |
| 2785 | error("bind: %.100s", strerror(errno)); |
| 2786 | else |
| 2787 | verbose("bind: %.100s", strerror(errno)); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 2788 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2789 | close(sock); |
| 2790 | continue; |
| 2791 | } |
| 2792 | /* Start listening for connections on the socket. */ |
Darren Tucker | 3175eb9 | 2003-12-09 19:15:11 +1100 | [diff] [blame] | 2793 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2794 | error("listen: %.100s", strerror(errno)); |
| 2795 | close(sock); |
| 2796 | continue; |
| 2797 | } |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 2798 | |
| 2799 | /* |
| 2800 | * listen_port == 0 requests a dynamically allocated port - |
| 2801 | * record what we got. |
| 2802 | */ |
| 2803 | if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 && |
| 2804 | allocated_listen_port != NULL && |
| 2805 | *allocated_listen_port == 0) { |
| 2806 | *allocated_listen_port = get_sock_port(sock, 1); |
| 2807 | debug("Allocated listen port %d", |
| 2808 | *allocated_listen_port); |
| 2809 | } |
| 2810 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2811 | /* Allocate a channel number for the socket. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2812 | c = channel_new("port listener", type, sock, sock, -1, |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2813 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 2814 | 0, "port listener", 1); |
Damien Miller | a1c1b6c | 2009-01-28 16:29:49 +1100 | [diff] [blame] | 2815 | c->path = xstrdup(host); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2816 | c->host_port = port_to_connect; |
| 2817 | c->listening_port = listen_port; |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2818 | c->listening_addr = addr == NULL ? NULL : xstrdup(addr); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2819 | success = 1; |
| 2820 | } |
| 2821 | if (success == 0) |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2822 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2823 | listen_port); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2824 | freeaddrinfo(aitop); |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2825 | return success; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2826 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2827 | |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2828 | int |
| 2829 | channel_cancel_rport_listener(const char *host, u_short port) |
| 2830 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 2831 | u_int i; |
| 2832 | int found = 0; |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2833 | |
Darren Tucker | 47eede7 | 2005-03-14 23:08:12 +1100 | [diff] [blame] | 2834 | for (i = 0; i < channels_alloc; i++) { |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2835 | Channel *c = channels[i]; |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2836 | if (c == NULL || c->type != SSH_CHANNEL_RPORT_LISTENER) |
| 2837 | continue; |
| 2838 | if (strcmp(c->path, host) == 0 && c->listening_port == port) { |
| 2839 | debug2("%s: close channel %d", __func__, i); |
| 2840 | channel_free(c); |
| 2841 | found = 1; |
| 2842 | } |
| 2843 | } |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2844 | |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2845 | return (found); |
| 2846 | } |
| 2847 | |
| 2848 | int |
| 2849 | channel_cancel_lport_listener(const char *lhost, u_short lport, |
Damien Miller | ff77364 | 2011-09-22 21:39:48 +1000 | [diff] [blame] | 2850 | int cport, int gateway_ports) |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2851 | { |
| 2852 | u_int i; |
| 2853 | int found = 0; |
| 2854 | const char *addr = channel_fwd_bind_addr(lhost, NULL, 1, gateway_ports); |
| 2855 | |
| 2856 | for (i = 0; i < channels_alloc; i++) { |
| 2857 | Channel *c = channels[i]; |
| 2858 | if (c == NULL || c->type != SSH_CHANNEL_PORT_LISTENER) |
| 2859 | continue; |
Damien Miller | ff77364 | 2011-09-22 21:39:48 +1000 | [diff] [blame] | 2860 | if (c->listening_port != lport) |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2861 | continue; |
Damien Miller | ff77364 | 2011-09-22 21:39:48 +1000 | [diff] [blame] | 2862 | if (cport == CHANNEL_CANCEL_PORT_STATIC) { |
| 2863 | /* skip dynamic forwardings */ |
| 2864 | if (c->host_port == 0) |
| 2865 | continue; |
| 2866 | } else { |
| 2867 | if (c->host_port != cport) |
| 2868 | continue; |
| 2869 | } |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2870 | if ((c->listening_addr == NULL && addr != NULL) || |
| 2871 | (c->listening_addr != NULL && addr == NULL)) |
| 2872 | continue; |
| 2873 | if (addr == NULL || strcmp(c->listening_addr, addr) == 0) { |
Darren Tucker | e6ed839 | 2004-08-29 16:29:44 +1000 | [diff] [blame] | 2874 | debug2("%s: close channel %d", __func__, i); |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2875 | channel_free(c); |
| 2876 | found = 1; |
| 2877 | } |
| 2878 | } |
| 2879 | |
| 2880 | return (found); |
| 2881 | } |
| 2882 | |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2883 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
| 2884 | int |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2885 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2886 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
| 2887 | { |
| 2888 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 2889 | listen_host, listen_port, NULL, host_to_connect, port_to_connect, |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2890 | gateway_ports); |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2891 | } |
| 2892 | |
| 2893 | /* protocol v2 remote port fwd, used by sshd */ |
| 2894 | int |
| 2895 | channel_setup_remote_fwd_listener(const char *listen_address, |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 2896 | u_short listen_port, int *allocated_listen_port, int gateway_ports) |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2897 | { |
| 2898 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 2899 | listen_address, listen_port, allocated_listen_port, |
| 2900 | NULL, 0, gateway_ports); |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2901 | } |
| 2902 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2903 | /* |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2904 | * Translate the requested rfwd listen host to something usable for |
| 2905 | * this server. |
| 2906 | */ |
| 2907 | static const char * |
| 2908 | channel_rfwd_bind_host(const char *listen_host) |
| 2909 | { |
| 2910 | if (listen_host == NULL) { |
| 2911 | if (datafellows & SSH_BUG_RFWD_ADDR) |
| 2912 | return "127.0.0.1"; |
| 2913 | else |
| 2914 | return "localhost"; |
| 2915 | } else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) { |
| 2916 | if (datafellows & SSH_BUG_RFWD_ADDR) |
| 2917 | return "0.0.0.0"; |
| 2918 | else |
| 2919 | return ""; |
| 2920 | } else |
| 2921 | return listen_host; |
| 2922 | } |
| 2923 | |
| 2924 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2925 | * Initiate forwarding of connections to port "port" on remote host through |
| 2926 | * the secure channel to host:port from local side. |
| 2927 | */ |
Darren Tucker | e7d4b19 | 2006-07-12 22:17:10 +1000 | [diff] [blame] | 2928 | int |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2929 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2930 | const char *host_to_connect, u_short port_to_connect) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2931 | { |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 2932 | int type, success = 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2933 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2934 | /* Send the forward request to the remote side. */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2935 | if (compat20) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2936 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
| 2937 | packet_put_cstring("tcpip-forward"); |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2938 | packet_put_char(1); /* boolean: want reply */ |
| 2939 | packet_put_cstring(channel_rfwd_bind_host(listen_host)); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2940 | packet_put_int(listen_port); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2941 | packet_send(); |
| 2942 | packet_write_wait(); |
| 2943 | /* Assume that server accepts the request */ |
| 2944 | success = 1; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2945 | } else { |
| 2946 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2947 | packet_put_int(listen_port); |
Damien Miller | 8bb73be | 2000-04-19 16:26:12 +1000 | [diff] [blame] | 2948 | packet_put_cstring(host_to_connect); |
| 2949 | packet_put_int(port_to_connect); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2950 | packet_send(); |
| 2951 | packet_write_wait(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2952 | |
| 2953 | /* Wait for response from the remote side. */ |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 2954 | type = packet_read(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2955 | switch (type) { |
| 2956 | case SSH_SMSG_SUCCESS: |
| 2957 | success = 1; |
| 2958 | break; |
| 2959 | case SSH_SMSG_FAILURE: |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2960 | break; |
| 2961 | default: |
| 2962 | /* Unknown packet */ |
| 2963 | packet_disconnect("Protocol error for port forward request:" |
| 2964 | "received packet type %d.", type); |
| 2965 | } |
| 2966 | } |
| 2967 | if (success) { |
Damien Miller | 232cfb1 | 2010-06-26 09:50:30 +1000 | [diff] [blame] | 2968 | /* Record that connection to this host/port is permitted. */ |
| 2969 | permitted_opens = xrealloc(permitted_opens, |
| 2970 | num_permitted_opens + 1, sizeof(*permitted_opens)); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2971 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); |
| 2972 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; |
| 2973 | permitted_opens[num_permitted_opens].listen_port = listen_port; |
| 2974 | num_permitted_opens++; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2975 | } |
Darren Tucker | e7d4b19 | 2006-07-12 22:17:10 +1000 | [diff] [blame] | 2976 | return (success ? 0 : -1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2977 | } |
| 2978 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2979 | /* |
Darren Tucker | fc95970 | 2004-07-17 16:12:08 +1000 | [diff] [blame] | 2980 | * Request cancellation of remote forwarding of connection host:port from |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2981 | * local side. |
| 2982 | */ |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2983 | int |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2984 | channel_request_rforward_cancel(const char *host, u_short port) |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2985 | { |
| 2986 | int i; |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2987 | |
| 2988 | if (!compat20) |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2989 | return -1; |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2990 | |
| 2991 | for (i = 0; i < num_permitted_opens; i++) { |
Darren Tucker | fc95970 | 2004-07-17 16:12:08 +1000 | [diff] [blame] | 2992 | if (permitted_opens[i].host_to_connect != NULL && |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2993 | permitted_opens[i].listen_port == port) |
| 2994 | break; |
| 2995 | } |
| 2996 | if (i >= num_permitted_opens) { |
| 2997 | debug("%s: requested forward not found", __func__); |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2998 | return -1; |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2999 | } |
| 3000 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
| 3001 | packet_put_cstring("cancel-tcpip-forward"); |
| 3002 | packet_put_char(0); |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 3003 | packet_put_cstring(channel_rfwd_bind_host(host)); |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 3004 | packet_put_int(port); |
| 3005 | packet_send(); |
| 3006 | |
| 3007 | permitted_opens[i].listen_port = 0; |
| 3008 | permitted_opens[i].port_to_connect = 0; |
Damien Miller | 0a0176e | 2005-11-05 15:07:59 +1100 | [diff] [blame] | 3009 | xfree(permitted_opens[i].host_to_connect); |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 3010 | permitted_opens[i].host_to_connect = NULL; |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 3011 | |
| 3012 | return 0; |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 3013 | } |
| 3014 | |
| 3015 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3016 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates |
| 3017 | * listening for the port, and sends back a success reply (or disconnect |
Darren Tucker | e7d4b19 | 2006-07-12 22:17:10 +1000 | [diff] [blame] | 3018 | * message if there was an error). |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3019 | */ |
Darren Tucker | e7d4b19 | 2006-07-12 22:17:10 +1000 | [diff] [blame] | 3020 | int |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 3021 | channel_input_port_forward_request(int is_root, int gateway_ports) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3022 | { |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 3023 | u_short port, host_port; |
Darren Tucker | e7d4b19 | 2006-07-12 22:17:10 +1000 | [diff] [blame] | 3024 | int success = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3025 | char *hostname; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3026 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3027 | /* Get arguments from the packet. */ |
| 3028 | port = packet_get_int(); |
| 3029 | hostname = packet_get_string(NULL); |
| 3030 | host_port = packet_get_int(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3031 | |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 3032 | #ifndef HAVE_CYGWIN |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3033 | /* |
| 3034 | * Check that an unprivileged user is not trying to forward a |
| 3035 | * privileged port. |
| 3036 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3037 | if (port < IPPORT_RESERVED && !is_root) |
Darren Tucker | 9189ff8 | 2003-07-03 13:52:04 +1000 | [diff] [blame] | 3038 | packet_disconnect( |
| 3039 | "Requested forwarding of port %d but user is not root.", |
| 3040 | port); |
| 3041 | if (host_port == 0) |
| 3042 | packet_disconnect("Dynamic forwarding denied."); |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 3043 | #endif |
Darren Tucker | 9189ff8 | 2003-07-03 13:52:04 +1000 | [diff] [blame] | 3044 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 3045 | /* Initiate forwarding */ |
Darren Tucker | e7d4b19 | 2006-07-12 22:17:10 +1000 | [diff] [blame] | 3046 | success = channel_setup_local_fwd_listener(NULL, port, hostname, |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 3047 | host_port, gateway_ports); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3048 | |
| 3049 | /* Free the argument string. */ |
| 3050 | xfree(hostname); |
Darren Tucker | e7d4b19 | 2006-07-12 22:17:10 +1000 | [diff] [blame] | 3051 | |
| 3052 | return (success ? 0 : -1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3053 | } |
| 3054 | |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3055 | /* |
| 3056 | * Permits opening to any host/port if permitted_opens[] is empty. This is |
| 3057 | * usually called by the server, because the user could connect to any port |
| 3058 | * anyway, and the server has no way to know but to trust the client anyway. |
| 3059 | */ |
| 3060 | void |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 3061 | channel_permit_all_opens(void) |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3062 | { |
| 3063 | if (num_permitted_opens == 0) |
| 3064 | all_opens_permitted = 1; |
| 3065 | } |
| 3066 | |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 3067 | void |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3068 | channel_add_permitted_opens(char *host, int port) |
| 3069 | { |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3070 | debug("allow port forwarding to host %s port %d", host, port); |
| 3071 | |
Damien Miller | 232cfb1 | 2010-06-26 09:50:30 +1000 | [diff] [blame] | 3072 | permitted_opens = xrealloc(permitted_opens, |
| 3073 | num_permitted_opens + 1, sizeof(*permitted_opens)); |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3074 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); |
| 3075 | permitted_opens[num_permitted_opens].port_to_connect = port; |
| 3076 | num_permitted_opens++; |
| 3077 | |
| 3078 | all_opens_permitted = 0; |
| 3079 | } |
| 3080 | |
Damien Miller | a765cf4 | 2006-07-24 14:08:13 +1000 | [diff] [blame] | 3081 | int |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3082 | channel_add_adm_permitted_opens(char *host, int port) |
| 3083 | { |
Damien Miller | a765cf4 | 2006-07-24 14:08:13 +1000 | [diff] [blame] | 3084 | debug("config allows port forwarding to host %s port %d", host, port); |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3085 | |
Damien Miller | 232cfb1 | 2010-06-26 09:50:30 +1000 | [diff] [blame] | 3086 | permitted_adm_opens = xrealloc(permitted_adm_opens, |
| 3087 | num_adm_permitted_opens + 1, sizeof(*permitted_adm_opens)); |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3088 | permitted_adm_opens[num_adm_permitted_opens].host_to_connect |
| 3089 | = xstrdup(host); |
| 3090 | permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port; |
Damien Miller | a765cf4 | 2006-07-24 14:08:13 +1000 | [diff] [blame] | 3091 | return ++num_adm_permitted_opens; |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3092 | } |
| 3093 | |
| 3094 | void |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3095 | channel_clear_permitted_opens(void) |
| 3096 | { |
| 3097 | int i; |
| 3098 | |
| 3099 | for (i = 0; i < num_permitted_opens; i++) |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 3100 | if (permitted_opens[i].host_to_connect != NULL) |
| 3101 | xfree(permitted_opens[i].host_to_connect); |
Damien Miller | 232cfb1 | 2010-06-26 09:50:30 +1000 | [diff] [blame] | 3102 | if (num_permitted_opens > 0) { |
| 3103 | xfree(permitted_opens); |
| 3104 | permitted_opens = NULL; |
| 3105 | } |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3106 | num_permitted_opens = 0; |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3107 | } |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3108 | |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3109 | void |
| 3110 | channel_clear_adm_permitted_opens(void) |
| 3111 | { |
| 3112 | int i; |
| 3113 | |
| 3114 | for (i = 0; i < num_adm_permitted_opens; i++) |
| 3115 | if (permitted_adm_opens[i].host_to_connect != NULL) |
| 3116 | xfree(permitted_adm_opens[i].host_to_connect); |
Damien Miller | 232cfb1 | 2010-06-26 09:50:30 +1000 | [diff] [blame] | 3117 | if (num_adm_permitted_opens > 0) { |
| 3118 | xfree(permitted_adm_opens); |
| 3119 | permitted_adm_opens = NULL; |
| 3120 | } |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3121 | num_adm_permitted_opens = 0; |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3122 | } |
| 3123 | |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 3124 | void |
| 3125 | channel_print_adm_permitted_opens(void) |
| 3126 | { |
Damien Miller | 6ef1749 | 2008-07-16 22:42:06 +1000 | [diff] [blame] | 3127 | int i; |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 3128 | |
Damien Miller | b53d8a1 | 2009-01-28 16:13:04 +1100 | [diff] [blame] | 3129 | printf("permitopen"); |
Darren Tucker | 22662e8 | 2008-11-11 16:40:22 +1100 | [diff] [blame] | 3130 | if (num_adm_permitted_opens == 0) { |
Damien Miller | b53d8a1 | 2009-01-28 16:13:04 +1100 | [diff] [blame] | 3131 | printf(" any\n"); |
Darren Tucker | 22662e8 | 2008-11-11 16:40:22 +1100 | [diff] [blame] | 3132 | return; |
| 3133 | } |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 3134 | for (i = 0; i < num_adm_permitted_opens; i++) |
| 3135 | if (permitted_adm_opens[i].host_to_connect != NULL) |
| 3136 | printf(" %s:%d", permitted_adm_opens[i].host_to_connect, |
| 3137 | permitted_adm_opens[i].port_to_connect); |
Damien Miller | b53d8a1 | 2009-01-28 16:13:04 +1100 | [diff] [blame] | 3138 | printf("\n"); |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 3139 | } |
| 3140 | |
Darren Tucker | 1338b9e | 2011-10-02 18:57:35 +1100 | [diff] [blame^] | 3141 | /* returns port number, FWD_PERMIT_ANY_PORT or -1 on error */ |
| 3142 | int |
| 3143 | permitopen_port(const char *p) |
| 3144 | { |
| 3145 | int port; |
| 3146 | |
| 3147 | if (strcmp(p, "*") == 0) |
| 3148 | return FWD_PERMIT_ANY_PORT; |
| 3149 | if ((port = a2port(p)) > 0) |
| 3150 | return port; |
| 3151 | return -1; |
| 3152 | } |
| 3153 | |
| 3154 | static int |
| 3155 | port_match(u_short allowedport, u_short requestedport) |
| 3156 | { |
| 3157 | if (allowedport == FWD_PERMIT_ANY_PORT || |
| 3158 | allowedport == requestedport) |
| 3159 | return 1; |
| 3160 | return 0; |
| 3161 | } |
| 3162 | |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3163 | /* Try to start non-blocking connect to next host in cctx list */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 3164 | static int |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3165 | connect_next(struct channel_connect *cctx) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3166 | { |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3167 | int sock, saved_errno; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3168 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3169 | |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3170 | for (; cctx->ai; cctx->ai = cctx->ai->ai_next) { |
| 3171 | if (cctx->ai->ai_family != AF_INET && |
| 3172 | cctx->ai->ai_family != AF_INET6) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3173 | continue; |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3174 | if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen, |
| 3175 | ntop, sizeof(ntop), strport, sizeof(strport), |
| 3176 | NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
| 3177 | error("connect_next: getnameinfo failed"); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3178 | continue; |
| 3179 | } |
Darren Tucker | 7bd98e7 | 2010-01-10 10:31:12 +1100 | [diff] [blame] | 3180 | if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype, |
| 3181 | cctx->ai->ai_protocol)) == -1) { |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3182 | if (cctx->ai->ai_next == NULL) |
Damien Miller | b46b9f3 | 2003-01-10 21:45:12 +1100 | [diff] [blame] | 3183 | error("socket: %.100s", strerror(errno)); |
| 3184 | else |
| 3185 | verbose("socket: %.100s", strerror(errno)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3186 | continue; |
| 3187 | } |
Damien Miller | 232711f | 2004-06-15 10:35:30 +1000 | [diff] [blame] | 3188 | if (set_nonblock(sock) == -1) |
| 3189 | fatal("%s: set_nonblock(%d)", __func__, sock); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3190 | if (connect(sock, cctx->ai->ai_addr, |
| 3191 | cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) { |
| 3192 | debug("connect_next: host %.100s ([%.100s]:%s): " |
| 3193 | "%.100s", cctx->host, ntop, strport, |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3194 | strerror(errno)); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3195 | saved_errno = errno; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3196 | close(sock); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3197 | errno = saved_errno; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 3198 | continue; /* fail -- try next */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3199 | } |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3200 | debug("connect_next: host %.100s ([%.100s]:%s) " |
| 3201 | "in progress, fd=%d", cctx->host, ntop, strport, sock); |
| 3202 | cctx->ai = cctx->ai->ai_next; |
| 3203 | set_nodelay(sock); |
| 3204 | return sock; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3205 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 3206 | return -1; |
| 3207 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 3208 | |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3209 | static void |
| 3210 | channel_connect_ctx_free(struct channel_connect *cctx) |
| 3211 | { |
| 3212 | xfree(cctx->host); |
| 3213 | if (cctx->aitop) |
| 3214 | freeaddrinfo(cctx->aitop); |
| 3215 | bzero(cctx, sizeof(*cctx)); |
| 3216 | cctx->host = NULL; |
| 3217 | cctx->ai = cctx->aitop = NULL; |
| 3218 | } |
| 3219 | |
| 3220 | /* Return CONNECTING channel to remote host, port */ |
| 3221 | static Channel * |
| 3222 | connect_to(const char *host, u_short port, char *ctype, char *rname) |
| 3223 | { |
| 3224 | struct addrinfo hints; |
| 3225 | int gaierr; |
| 3226 | int sock = -1; |
| 3227 | char strport[NI_MAXSERV]; |
| 3228 | struct channel_connect cctx; |
| 3229 | Channel *c; |
| 3230 | |
Damien Miller | 2bcb866 | 2008-07-12 17:12:29 +1000 | [diff] [blame] | 3231 | memset(&cctx, 0, sizeof(cctx)); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3232 | memset(&hints, 0, sizeof(hints)); |
| 3233 | hints.ai_family = IPv4or6; |
| 3234 | hints.ai_socktype = SOCK_STREAM; |
| 3235 | snprintf(strport, sizeof strport, "%d", port); |
| 3236 | if ((gaierr = getaddrinfo(host, strport, &hints, &cctx.aitop)) != 0) { |
| 3237 | error("connect_to %.100s: unknown host (%s)", host, |
| 3238 | ssh_gai_strerror(gaierr)); |
| 3239 | return NULL; |
| 3240 | } |
| 3241 | |
| 3242 | cctx.host = xstrdup(host); |
| 3243 | cctx.port = port; |
| 3244 | cctx.ai = cctx.aitop; |
| 3245 | |
| 3246 | if ((sock = connect_next(&cctx)) == -1) { |
| 3247 | error("connect to %.100s port %d failed: %s", |
| 3248 | host, port, strerror(errno)); |
| 3249 | channel_connect_ctx_free(&cctx); |
| 3250 | return NULL; |
| 3251 | } |
| 3252 | c = channel_new(ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1, |
| 3253 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1); |
| 3254 | c->connect_ctx = cctx; |
| 3255 | return c; |
| 3256 | } |
| 3257 | |
| 3258 | Channel * |
| 3259 | channel_connect_by_listen_address(u_short listen_port, char *ctype, char *rname) |
| 3260 | { |
| 3261 | int i; |
| 3262 | |
| 3263 | for (i = 0; i < num_permitted_opens; i++) { |
| 3264 | if (permitted_opens[i].host_to_connect != NULL && |
Darren Tucker | 1338b9e | 2011-10-02 18:57:35 +1100 | [diff] [blame^] | 3265 | port_match(permitted_opens[i].listen_port, listen_port)) { |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3266 | return connect_to( |
| 3267 | permitted_opens[i].host_to_connect, |
| 3268 | permitted_opens[i].port_to_connect, ctype, rname); |
| 3269 | } |
| 3270 | } |
| 3271 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
| 3272 | listen_port); |
| 3273 | return NULL; |
| 3274 | } |
| 3275 | |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3276 | /* Check if connecting to that port is permitted and connect. */ |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3277 | Channel * |
| 3278 | channel_connect_to(const char *host, u_short port, char *ctype, char *rname) |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3279 | { |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3280 | int i, permit, permit_adm = 1; |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3281 | |
| 3282 | permit = all_opens_permitted; |
| 3283 | if (!permit) { |
| 3284 | for (i = 0; i < num_permitted_opens; i++) |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 3285 | if (permitted_opens[i].host_to_connect != NULL && |
Darren Tucker | 1338b9e | 2011-10-02 18:57:35 +1100 | [diff] [blame^] | 3286 | port_match(permitted_opens[i].port_to_connect, port) && |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3287 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
| 3288 | permit = 1; |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3289 | } |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3290 | |
| 3291 | if (num_adm_permitted_opens > 0) { |
| 3292 | permit_adm = 0; |
| 3293 | for (i = 0; i < num_adm_permitted_opens; i++) |
| 3294 | if (permitted_adm_opens[i].host_to_connect != NULL && |
Darren Tucker | 1338b9e | 2011-10-02 18:57:35 +1100 | [diff] [blame^] | 3295 | port_match(permitted_adm_opens[i].port_to_connect, port) && |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3296 | strcmp(permitted_adm_opens[i].host_to_connect, host) |
| 3297 | == 0) |
| 3298 | permit_adm = 1; |
| 3299 | } |
| 3300 | |
| 3301 | if (!permit || !permit_adm) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 3302 | logit("Received request to connect to host %.100s port %d, " |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3303 | "but the request was denied.", host, port); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3304 | return NULL; |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3305 | } |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3306 | return connect_to(host, port, ctype, rname); |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3307 | } |
| 3308 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 3309 | void |
| 3310 | channel_send_window_changes(void) |
| 3311 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 3312 | u_int i; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 3313 | struct winsize ws; |
| 3314 | |
| 3315 | for (i = 0; i < channels_alloc; i++) { |
Darren Tucker | 47eede7 | 2005-03-14 23:08:12 +1100 | [diff] [blame] | 3316 | if (channels[i] == NULL || !channels[i]->client_tty || |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 3317 | channels[i]->type != SSH_CHANNEL_OPEN) |
| 3318 | continue; |
| 3319 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) |
| 3320 | continue; |
| 3321 | channel_request_start(i, "window-change", 0); |
Damien Miller | 71a7367 | 2006-03-26 14:04:36 +1100 | [diff] [blame] | 3322 | packet_put_int((u_int)ws.ws_col); |
| 3323 | packet_put_int((u_int)ws.ws_row); |
| 3324 | packet_put_int((u_int)ws.ws_xpixel); |
| 3325 | packet_put_int((u_int)ws.ws_ypixel); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 3326 | packet_send(); |
| 3327 | } |
| 3328 | } |
| 3329 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 3330 | /* -- X11 forwarding */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3331 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3332 | /* |
| 3333 | * Creates an internet domain socket for listening for X11 connections. |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 3334 | * Returns 0 and a suitable display number for the DISPLAY variable |
| 3335 | * stored in display_numberp , or -1 if an error occurs. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3336 | */ |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 3337 | int |
Damien Miller | 95c249f | 2002-02-05 12:11:34 +1100 | [diff] [blame] | 3338 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 3339 | int single_connection, u_int *display_numberp, int **chanids) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3340 | { |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 3341 | Channel *nc = NULL; |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 3342 | int display_number, sock; |
| 3343 | u_short port; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3344 | struct addrinfo hints, *ai, *aitop; |
| 3345 | char strport[NI_MAXSERV]; |
| 3346 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3347 | |
Darren Tucker | d3d0fa1 | 2005-10-03 18:03:05 +1000 | [diff] [blame] | 3348 | if (chanids == NULL) |
| 3349 | return -1; |
| 3350 | |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 3351 | for (display_number = x11_display_offset; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 3352 | display_number < MAX_DISPLAYS; |
| 3353 | display_number++) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3354 | port = 6000 + display_number; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3355 | memset(&hints, 0, sizeof(hints)); |
| 3356 | hints.ai_family = IPv4or6; |
Damien Miller | 95c249f | 2002-02-05 12:11:34 +1100 | [diff] [blame] | 3357 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3358 | hints.ai_socktype = SOCK_STREAM; |
| 3359 | snprintf(strport, sizeof strport, "%d", port); |
| 3360 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { |
Darren Tucker | 4abde77 | 2007-12-29 02:43:51 +1100 | [diff] [blame] | 3361 | error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr)); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 3362 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3363 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3364 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 3365 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 3366 | continue; |
Darren Tucker | 7bd98e7 | 2010-01-10 10:31:12 +1100 | [diff] [blame] | 3367 | sock = socket(ai->ai_family, ai->ai_socktype, |
| 3368 | ai->ai_protocol); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3369 | if (sock < 0) { |
Damien Miller | 6480c63 | 2010-03-26 11:09:44 +1100 | [diff] [blame] | 3370 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT) |
| 3371 | #ifdef EPFNOSUPPORT |
| 3372 | && (errno != EPFNOSUPPORT) |
| 3373 | #endif |
| 3374 | ) { |
Damien Miller | e219273 | 2000-01-17 13:22:55 +1100 | [diff] [blame] | 3375 | error("socket: %.100s", strerror(errno)); |
Damien Miller | 3e4dffb | 2004-06-15 10:27:15 +1000 | [diff] [blame] | 3376 | freeaddrinfo(aitop); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 3377 | return -1; |
Damien Miller | e219273 | 2000-01-17 13:22:55 +1100 | [diff] [blame] | 3378 | } else { |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 3379 | debug("x11_create_display_inet: Socket family %d not supported", |
| 3380 | ai->ai_family); |
Damien Miller | e219273 | 2000-01-17 13:22:55 +1100 | [diff] [blame] | 3381 | continue; |
| 3382 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3383 | } |
Damien Miller | 04ee0f8 | 2009-11-18 17:48:30 +1100 | [diff] [blame] | 3384 | if (ai->ai_family == AF_INET6) |
| 3385 | sock_set_v6only(sock); |
Damien Miller | 4401e45 | 2008-06-12 06:05:12 +1000 | [diff] [blame] | 3386 | if (x11_use_localhost) |
| 3387 | channel_set_reuseaddr(sock); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3388 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 3389 | debug2("bind port %d: %.100s", port, strerror(errno)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3390 | close(sock); |
Damien Miller | 3c7eeb2 | 2000-03-03 22:35:33 +1100 | [diff] [blame] | 3391 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3392 | for (n = 0; n < num_socks; n++) { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3393 | close(socks[n]); |
| 3394 | } |
| 3395 | num_socks = 0; |
| 3396 | break; |
| 3397 | } |
| 3398 | socks[num_socks++] = sock; |
| 3399 | if (num_socks == NUM_SOCKS) |
| 3400 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3401 | } |
Ben Lindstrom | 87b147f | 2001-01-25 00:41:12 +0000 | [diff] [blame] | 3402 | freeaddrinfo(aitop); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3403 | if (num_socks > 0) |
| 3404 | break; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3405 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3406 | if (display_number >= MAX_DISPLAYS) { |
| 3407 | error("Failed to allocate internet-domain X11 display socket."); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 3408 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3409 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3410 | /* Start listening for connections on the socket. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3411 | for (n = 0; n < num_socks; n++) { |
| 3412 | sock = socks[n]; |
Darren Tucker | 3175eb9 | 2003-12-09 19:15:11 +1100 | [diff] [blame] | 3413 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3414 | error("listen: %.100s", strerror(errno)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3415 | close(sock); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 3416 | return -1; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3417 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3418 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3419 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3420 | /* Allocate a channel for each socket. */ |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 3421 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3422 | for (n = 0; n < num_socks; n++) { |
| 3423 | sock = socks[n]; |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 3424 | nc = channel_new("x11 listener", |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3425 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
| 3426 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 3427 | 0, "X11 inet listener", 1); |
Damien Miller | 699d003 | 2002-02-08 22:07:16 +1100 | [diff] [blame] | 3428 | nc->single_connection = single_connection; |
Darren Tucker | d3d0fa1 | 2005-10-03 18:03:05 +1000 | [diff] [blame] | 3429 | (*chanids)[n] = nc->self; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3430 | } |
Darren Tucker | d3d0fa1 | 2005-10-03 18:03:05 +1000 | [diff] [blame] | 3431 | (*chanids)[n] = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3432 | |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 3433 | /* Return the display number for the DISPLAY environment variable. */ |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 3434 | *display_numberp = display_number; |
| 3435 | return (0); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3436 | } |
| 3437 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 3438 | static int |
Damien Miller | 819dbb6 | 2009-01-21 16:46:26 +1100 | [diff] [blame] | 3439 | connect_local_xsocket_path(const char *pathname) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3440 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3441 | int sock; |
| 3442 | struct sockaddr_un addr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3443 | |
Damien Miller | 3afe375 | 2001-12-21 12:39:51 +1100 | [diff] [blame] | 3444 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 3445 | if (sock < 0) |
| 3446 | error("socket: %.100s", strerror(errno)); |
| 3447 | memset(&addr, 0, sizeof(addr)); |
| 3448 | addr.sun_family = AF_UNIX; |
Damien Miller | 819dbb6 | 2009-01-21 16:46:26 +1100 | [diff] [blame] | 3449 | strlcpy(addr.sun_path, pathname, sizeof addr.sun_path); |
Damien Miller | 9096740 | 2006-03-26 14:07:26 +1100 | [diff] [blame] | 3450 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
Damien Miller | 3afe375 | 2001-12-21 12:39:51 +1100 | [diff] [blame] | 3451 | return sock; |
| 3452 | close(sock); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3453 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
| 3454 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3455 | } |
| 3456 | |
Damien Miller | 819dbb6 | 2009-01-21 16:46:26 +1100 | [diff] [blame] | 3457 | static int |
| 3458 | connect_local_xsocket(u_int dnr) |
| 3459 | { |
| 3460 | char buf[1024]; |
| 3461 | snprintf(buf, sizeof buf, _PATH_UNIX_X, dnr); |
| 3462 | return connect_local_xsocket_path(buf); |
| 3463 | } |
| 3464 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3465 | int |
| 3466 | x11_connect_display(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3467 | { |
Damien Miller | 57c4e87 | 2006-03-31 23:11:07 +1100 | [diff] [blame] | 3468 | u_int display_number; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3469 | const char *display; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3470 | char buf[1024], *cp; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3471 | struct addrinfo hints, *ai, *aitop; |
| 3472 | char strport[NI_MAXSERV]; |
Damien Miller | 57c4e87 | 2006-03-31 23:11:07 +1100 | [diff] [blame] | 3473 | int gaierr, sock = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3474 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3475 | /* Try to open a socket for the local X server. */ |
| 3476 | display = getenv("DISPLAY"); |
| 3477 | if (!display) { |
| 3478 | error("DISPLAY not set."); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3479 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3480 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3481 | /* |
| 3482 | * Now we decode the value of the DISPLAY variable and make a |
| 3483 | * connection to the real X server. |
| 3484 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3485 | |
Damien Miller | 819dbb6 | 2009-01-21 16:46:26 +1100 | [diff] [blame] | 3486 | /* Check if the display is from launchd. */ |
| 3487 | #ifdef __APPLE__ |
| 3488 | if (strncmp(display, "/tmp/launch", 11) == 0) { |
| 3489 | sock = connect_local_xsocket_path(display); |
| 3490 | if (sock < 0) |
| 3491 | return -1; |
| 3492 | |
| 3493 | /* OK, we now have a connection to the display. */ |
| 3494 | return sock; |
| 3495 | } |
| 3496 | #endif |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3497 | /* |
| 3498 | * Check if it is a unix domain socket. Unix domain displays are in |
| 3499 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] |
| 3500 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3501 | if (strncmp(display, "unix:", 5) == 0 || |
| 3502 | display[0] == ':') { |
| 3503 | /* Connect to the unix domain socket. */ |
Damien Miller | 57c4e87 | 2006-03-31 23:11:07 +1100 | [diff] [blame] | 3504 | if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3505 | error("Could not parse display number from DISPLAY: %.100s", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 3506 | display); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3507 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3508 | } |
| 3509 | /* Create a socket. */ |
| 3510 | sock = connect_local_xsocket(display_number); |
| 3511 | if (sock < 0) |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3512 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3513 | |
| 3514 | /* OK, we now have a connection to the display. */ |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3515 | return sock; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3516 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3517 | /* |
| 3518 | * Connect to an inet socket. The DISPLAY value is supposedly |
| 3519 | * hostname:d[.s], where hostname may also be numeric IP address. |
| 3520 | */ |
Ben Lindstrom | ccd8d07 | 2001-12-07 17:26:48 +0000 | [diff] [blame] | 3521 | strlcpy(buf, display, sizeof(buf)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3522 | cp = strchr(buf, ':'); |
| 3523 | if (!cp) { |
| 3524 | error("Could not find ':' in DISPLAY: %.100s", display); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3525 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3526 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3527 | *cp = 0; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3528 | /* buf now contains the host name. But first we parse the display number. */ |
Damien Miller | 57c4e87 | 2006-03-31 23:11:07 +1100 | [diff] [blame] | 3529 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3530 | error("Could not parse display number from DISPLAY: %.100s", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 3531 | display); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3532 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3533 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3534 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3535 | /* Look up the host address */ |
| 3536 | memset(&hints, 0, sizeof(hints)); |
| 3537 | hints.ai_family = IPv4or6; |
| 3538 | hints.ai_socktype = SOCK_STREAM; |
Damien Miller | 57c4e87 | 2006-03-31 23:11:07 +1100 | [diff] [blame] | 3539 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3540 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
Darren Tucker | 4abde77 | 2007-12-29 02:43:51 +1100 | [diff] [blame] | 3541 | error("%.100s: unknown host. (%s)", buf, |
| 3542 | ssh_gai_strerror(gaierr)); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3543 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3544 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3545 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 3546 | /* Create a socket. */ |
Darren Tucker | 7bd98e7 | 2010-01-10 10:31:12 +1100 | [diff] [blame] | 3547 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3548 | if (sock < 0) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 3549 | debug2("socket: %.100s", strerror(errno)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 3550 | continue; |
| 3551 | } |
| 3552 | /* Connect it to the display. */ |
| 3553 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
Damien Miller | 57c4e87 | 2006-03-31 23:11:07 +1100 | [diff] [blame] | 3554 | debug2("connect %.100s port %u: %.100s", buf, |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 3555 | 6000 + display_number, strerror(errno)); |
| 3556 | close(sock); |
| 3557 | continue; |
| 3558 | } |
| 3559 | /* Success */ |
| 3560 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3561 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3562 | freeaddrinfo(aitop); |
| 3563 | if (!ai) { |
Damien Miller | 57c4e87 | 2006-03-31 23:11:07 +1100 | [diff] [blame] | 3564 | error("connect %.100s port %u: %.100s", buf, 6000 + display_number, |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3565 | strerror(errno)); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3566 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3567 | } |
Damien Miller | 398e1cf | 2002-02-05 11:52:13 +1100 | [diff] [blame] | 3568 | set_nodelay(sock); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3569 | return sock; |
| 3570 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3571 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3572 | /* |
| 3573 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains |
| 3574 | * the remote channel number. We should do whatever we want, and respond |
| 3575 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. |
| 3576 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3577 | |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 3578 | /* ARGSUSED */ |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3579 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 3580 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3581 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 3582 | Channel *c = NULL; |
| 3583 | int remote_id, sock = 0; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3584 | char *remote_host; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3585 | |
| 3586 | debug("Received X11 open request."); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 3587 | |
| 3588 | remote_id = packet_get_int(); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 3589 | |
| 3590 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 3591 | remote_host = packet_get_string(NULL); |
| 3592 | } else { |
| 3593 | remote_host = xstrdup("unknown (remote did not supply name)"); |
| 3594 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 3595 | packet_check_eom(); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3596 | |
| 3597 | /* Obtain a connection to the real X display. */ |
| 3598 | sock = x11_connect_display(); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 3599 | if (sock != -1) { |
| 3600 | /* Allocate a channel for this connection. */ |
| 3601 | c = channel_new("connected x11 socket", |
| 3602 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, |
| 3603 | remote_host, 1); |
Damien Miller | 699d003 | 2002-02-08 22:07:16 +1100 | [diff] [blame] | 3604 | c->remote_id = remote_id; |
| 3605 | c->force_drain = 1; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 3606 | } |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 3607 | xfree(remote_host); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 3608 | if (c == NULL) { |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3609 | /* Send refusal to the remote host. */ |
| 3610 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 3611 | packet_put_int(remote_id); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3612 | } else { |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3613 | /* Send a confirmation to the remote host. */ |
| 3614 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 3615 | packet_put_int(remote_id); |
| 3616 | packet_put_int(c->self); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3617 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 3618 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3619 | } |
| 3620 | |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 3621 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 3622 | /* ARGSUSED */ |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 3623 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 3624 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 3625 | { |
| 3626 | int rchan = packet_get_int(); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 3627 | |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 3628 | switch (type) { |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 3629 | case SSH_SMSG_AGENT_OPEN: |
| 3630 | error("Warning: ssh server tried agent forwarding."); |
| 3631 | break; |
| 3632 | case SSH_SMSG_X11_OPEN: |
| 3633 | error("Warning: ssh server tried X11 forwarding."); |
| 3634 | break; |
| 3635 | default: |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 3636 | error("deny_input_open: type %d", type); |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 3637 | break; |
| 3638 | } |
Damien Miller | 5eb137c | 2005-12-31 16:19:53 +1100 | [diff] [blame] | 3639 | error("Warning: this is probably a break-in attempt by a malicious server."); |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 3640 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 3641 | packet_put_int(rchan); |
| 3642 | packet_send(); |
| 3643 | } |
| 3644 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3645 | /* |
| 3646 | * Requests forwarding of X11 connections, generates fake authentication |
| 3647 | * data, and enables authentication spoofing. |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 3648 | * This should be called in the client only. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3649 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 3650 | void |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 3651 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
Damien Miller | 6d7b437 | 2011-06-23 08:31:57 +1000 | [diff] [blame] | 3652 | const char *proto, const char *data, int want_reply) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3653 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 3654 | u_int data_len = (u_int) strlen(data) / 2; |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 3655 | u_int i, value; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3656 | char *new_data; |
| 3657 | int screen_number; |
| 3658 | const char *cp; |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 3659 | u_int32_t rnd = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3660 | |
Damien Miller | f92c079 | 2005-07-06 09:45:26 +1000 | [diff] [blame] | 3661 | if (x11_saved_display == NULL) |
| 3662 | x11_saved_display = xstrdup(disp); |
| 3663 | else if (strcmp(disp, x11_saved_display) != 0) { |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 3664 | error("x11_request_forwarding_with_spoofing: different " |
| 3665 | "$DISPLAY already forwarded"); |
| 3666 | return; |
| 3667 | } |
| 3668 | |
Damien Miller | d5fe0ba | 2006-08-30 11:07:39 +1000 | [diff] [blame] | 3669 | cp = strchr(disp, ':'); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3670 | if (cp) |
| 3671 | cp = strchr(cp, '.'); |
| 3672 | if (cp) |
Damien Miller | 08d6150 | 2006-03-26 14:28:32 +1100 | [diff] [blame] | 3673 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3674 | else |
| 3675 | screen_number = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3676 | |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 3677 | if (x11_saved_proto == NULL) { |
| 3678 | /* Save protocol name. */ |
| 3679 | x11_saved_proto = xstrdup(proto); |
| 3680 | /* |
Damien Miller | 46d38de | 2005-07-17 17:02:09 +1000 | [diff] [blame] | 3681 | * Extract real authentication data and generate fake data |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 3682 | * of the same length. |
| 3683 | */ |
| 3684 | x11_saved_data = xmalloc(data_len); |
| 3685 | x11_fake_data = xmalloc(data_len); |
| 3686 | for (i = 0; i < data_len; i++) { |
| 3687 | if (sscanf(data + 2 * i, "%2x", &value) != 1) |
| 3688 | fatal("x11_request_forwarding: bad " |
| 3689 | "authentication data: %.100s", data); |
| 3690 | if (i % 4 == 0) |
| 3691 | rnd = arc4random(); |
| 3692 | x11_saved_data[i] = value; |
| 3693 | x11_fake_data[i] = rnd & 0xff; |
| 3694 | rnd >>= 8; |
| 3695 | } |
| 3696 | x11_saved_data_len = data_len; |
| 3697 | x11_fake_data_len = data_len; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3698 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3699 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3700 | /* Convert the fake data into hex. */ |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 3701 | new_data = tohex(x11_fake_data, data_len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3702 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3703 | /* Send the request packet. */ |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3704 | if (compat20) { |
Damien Miller | 6d7b437 | 2011-06-23 08:31:57 +1000 | [diff] [blame] | 3705 | channel_request_start(client_session_id, "x11-req", want_reply); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3706 | packet_put_char(0); /* XXX bool single connection */ |
| 3707 | } else { |
| 3708 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); |
| 3709 | } |
| 3710 | packet_put_cstring(proto); |
| 3711 | packet_put_cstring(new_data); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3712 | packet_put_int(screen_number); |
| 3713 | packet_send(); |
| 3714 | packet_write_wait(); |
| 3715 | xfree(new_data); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3716 | } |
| 3717 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 3718 | |
| 3719 | /* -- agent forwarding */ |
| 3720 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3721 | /* Sends a message to the server to request authentication fd forwarding. */ |
| 3722 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 3723 | void |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 3724 | auth_request_forwarding(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3725 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3726 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
| 3727 | packet_send(); |
| 3728 | packet_write_wait(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3729 | } |