djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 1 | /* $OpenBSD: channels.c,v 1.358 2017/04/30 23:13:25 djm 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 | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 45 | #include <sys/stat.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 46 | #include <sys/ioctl.h> |
Damien Miller | 574c41f | 2006-03-15 11:40:10 +1100 | [diff] [blame] | 47 | #include <sys/un.h> |
Damien Miller | efc04e7 | 2006-07-10 20:26:27 +1000 | [diff] [blame] | 48 | #include <sys/socket.h> |
Damien Miller | 9aec919 | 2006-08-05 10:57:45 +1000 | [diff] [blame] | 49 | #ifdef HAVE_SYS_TIME_H |
| 50 | # include <sys/time.h> |
| 51 | #endif |
Damien Miller | efc04e7 | 2006-07-10 20:26:27 +1000 | [diff] [blame] | 52 | |
| 53 | #include <netinet/in.h> |
| 54 | #include <arpa/inet.h> |
Damien Miller | 99bd21e | 2006-03-15 11:11:28 +1100 | [diff] [blame] | 55 | |
Darren Tucker | 3997249 | 2006-07-12 22:22:46 +1000 | [diff] [blame] | 56 | #include <errno.h> |
Darren Tucker | 6e7fe1c | 2010-01-08 17:07:22 +1100 | [diff] [blame] | 57 | #include <fcntl.h> |
Damien Miller | b8fe89c | 2006-07-24 14:51:00 +1000 | [diff] [blame] | 58 | #include <netdb.h> |
Darren Tucker | 37f9220 | 2015-02-23 03:07:24 +1100 | [diff] [blame] | 59 | #ifdef HAVE_STDINT_H |
millert@openbsd.org | fd36834 | 2015-02-06 23:21:59 +0000 | [diff] [blame] | 60 | #include <stdint.h> |
Darren Tucker | 37f9220 | 2015-02-23 03:07:24 +1100 | [diff] [blame] | 61 | #endif |
Damien Miller | a7a73ee | 2006-08-05 11:37:59 +1000 | [diff] [blame] | 62 | #include <stdio.h> |
Damien Miller | e7a1e5c | 2006-08-05 11:34:19 +1000 | [diff] [blame] | 63 | #include <stdlib.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 64 | #include <string.h> |
Damien Miller | 99bd21e | 2006-03-15 11:11:28 +1100 | [diff] [blame] | 65 | #include <termios.h> |
Damien Miller | e6b3b61 | 2006-07-24 14:01:23 +1000 | [diff] [blame] | 66 | #include <unistd.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 67 | #include <stdarg.h> |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 68 | |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 69 | #include "openbsd-compat/sys-queue.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 70 | #include "xmalloc.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 71 | #include "ssh.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 72 | #include "ssh1.h" |
| 73 | #include "ssh2.h" |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 74 | #include "ssherr.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 75 | #include "packet.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 76 | #include "log.h" |
| 77 | #include "misc.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 78 | #include "buffer.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 79 | #include "channels.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 80 | #include "compat.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 81 | #include "canohost.h" |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 82 | #include "key.h" |
| 83 | #include "authfd.h" |
Damien Miller | 3afe375 | 2001-12-21 12:39:51 +1100 | [diff] [blame] | 84 | #include "pathnames.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 85 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 86 | /* -- channel core */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 87 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 88 | /* |
| 89 | * Pointer to an array containing all allocated channels. The array is |
| 90 | * dynamically extended as needed. |
| 91 | */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 92 | static Channel **channels = NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 93 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 94 | /* |
| 95 | * 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] | 96 | * initialized (at least the type field); unused slots set to NULL |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 97 | */ |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 98 | static u_int channels_alloc = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 99 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 100 | /* |
| 101 | * Maximum file descriptor value used in any of the channels. This is |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 102 | * updated in channel_new. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 103 | */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 104 | static int channel_max_fd = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 105 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 106 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 107 | /* -- tcp forwarding */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 108 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 109 | /* |
| 110 | * Data structure for storing which hosts are permitted for forward requests. |
| 111 | * The local sides of any remote forwards are stored in this array to prevent |
| 112 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local |
| 113 | * network (which might be behind a firewall). |
| 114 | */ |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 115 | /* XXX: streamlocal wants a path instead of host:port */ |
| 116 | /* Overload host_to_connect; we could just make this match Forward */ |
| 117 | /* XXX - can we use listen_host instead of listen_path? */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 118 | typedef struct { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 119 | char *host_to_connect; /* Connect to 'host'. */ |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 120 | int port_to_connect; /* Connect to 'port'. */ |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 121 | char *listen_host; /* Remote side should listen address. */ |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 122 | char *listen_path; /* Remote side should listen path. */ |
| 123 | int listen_port; /* Remote side should listen port. */ |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 124 | Channel *downstream; /* Downstream mux*/ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 125 | } ForwardPermission; |
| 126 | |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 127 | /* List of all permitted host/port pairs to connect by the user. */ |
Damien Miller | 232cfb1 | 2010-06-26 09:50:30 +1000 | [diff] [blame] | 128 | static ForwardPermission *permitted_opens = NULL; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 129 | |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 130 | /* List of all permitted host/port pairs to connect by the admin. */ |
Damien Miller | 232cfb1 | 2010-06-26 09:50:30 +1000 | [diff] [blame] | 131 | static ForwardPermission *permitted_adm_opens = NULL; |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 132 | |
| 133 | /* 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] | 134 | static int num_permitted_opens = 0; |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 135 | |
| 136 | /* Number of permitted host/port pair in the array permitted by the admin. */ |
| 137 | static int num_adm_permitted_opens = 0; |
| 138 | |
Darren Tucker | 1338b9e | 2011-10-02 18:57:35 +1100 | [diff] [blame] | 139 | /* special-case port number meaning allow any port */ |
| 140 | #define FWD_PERMIT_ANY_PORT 0 |
| 141 | |
dtucker@openbsd.org | d7eabc8 | 2016-07-19 11:38:53 +0000 | [diff] [blame] | 142 | /* special-case wildcard meaning allow any host */ |
| 143 | #define FWD_PERMIT_ANY_HOST "*" |
| 144 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 145 | /* |
| 146 | * If this is true, all opens are permitted. This is the case on the server |
| 147 | * on which we have to trust the client anyway, and the user could do |
| 148 | * anything after logging in anyway. |
| 149 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 150 | static int all_opens_permitted = 0; |
| 151 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 152 | |
| 153 | /* -- X11 forwarding */ |
| 154 | |
| 155 | /* Maximum number of fake X11 displays to try. */ |
| 156 | #define MAX_DISPLAYS 1000 |
| 157 | |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 158 | /* Saved X11 local (client) display. */ |
| 159 | static char *x11_saved_display = NULL; |
| 160 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 161 | /* Saved X11 authentication protocol name. */ |
| 162 | static char *x11_saved_proto = NULL; |
| 163 | |
| 164 | /* Saved X11 authentication data. This is the real data. */ |
| 165 | static char *x11_saved_data = NULL; |
| 166 | static u_int x11_saved_data_len = 0; |
| 167 | |
djm@openbsd.org | 1bf477d | 2015-07-01 02:26:31 +0000 | [diff] [blame] | 168 | /* Deadline after which all X11 connections are refused */ |
| 169 | static u_int x11_refuse_time; |
| 170 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 171 | /* |
| 172 | * Fake X11 authentication data. This is what the server will be sending us; |
| 173 | * we should replace any occurrences of this by the real data. |
| 174 | */ |
Damien Miller | 4ae97f1 | 2006-03-26 14:08:10 +1100 | [diff] [blame] | 175 | static u_char *x11_fake_data = NULL; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 176 | static u_int x11_fake_data_len; |
| 177 | |
| 178 | |
| 179 | /* -- agent forwarding */ |
| 180 | |
| 181 | #define NUM_SOCKS 10 |
| 182 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 183 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
Ben Lindstrom | 908afed | 2001-10-03 17:34:59 +0000 | [diff] [blame] | 184 | static int IPv4or6 = AF_UNSPEC; |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 185 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 186 | /* helper */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 187 | static void port_open_helper(Channel *c, char *rtype); |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 188 | static const char *channel_rfwd_bind_host(const char *listen_host); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 189 | |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 190 | /* non-blocking connect helpers */ |
| 191 | static int connect_next(struct channel_connect *); |
| 192 | static void channel_connect_ctx_free(struct channel_connect *); |
| 193 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 194 | /* -- channel core */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 195 | |
| 196 | Channel * |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 197 | channel_by_id(int id) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 198 | { |
| 199 | Channel *c; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 200 | |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 201 | if (id < 0 || (u_int)id >= channels_alloc) { |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 202 | logit("channel_by_id: %d: bad id", id); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 203 | return NULL; |
| 204 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 205 | c = channels[id]; |
| 206 | if (c == NULL) { |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 207 | logit("channel_by_id: %d: bad id: channel free", id); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 208 | return NULL; |
| 209 | } |
| 210 | return c; |
| 211 | } |
| 212 | |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 213 | Channel * |
| 214 | channel_by_remote_id(int remote_id) |
| 215 | { |
| 216 | Channel *c; |
| 217 | u_int i; |
| 218 | |
| 219 | for (i = 0; i < channels_alloc; i++) { |
| 220 | c = channels[i]; |
| 221 | if (c != NULL && c->remote_id == remote_id) |
| 222 | return c; |
| 223 | } |
| 224 | return NULL; |
| 225 | } |
| 226 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 227 | /* |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 228 | * Returns the channel if it is allowed to receive protocol messages. |
| 229 | * Private channels, like listening sockets, may not receive messages. |
| 230 | */ |
| 231 | Channel * |
| 232 | channel_lookup(int id) |
| 233 | { |
| 234 | Channel *c; |
| 235 | |
| 236 | if ((c = channel_by_id(id)) == NULL) |
| 237 | return (NULL); |
| 238 | |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 239 | switch (c->type) { |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 240 | case SSH_CHANNEL_X11_OPEN: |
| 241 | case SSH_CHANNEL_LARVAL: |
| 242 | case SSH_CHANNEL_CONNECTING: |
| 243 | case SSH_CHANNEL_DYNAMIC: |
| 244 | case SSH_CHANNEL_OPENING: |
| 245 | case SSH_CHANNEL_OPEN: |
| 246 | case SSH_CHANNEL_INPUT_DRAINING: |
| 247 | case SSH_CHANNEL_OUTPUT_DRAINING: |
Damien Miller | 3618709 | 2013-06-10 13:07:11 +1000 | [diff] [blame] | 248 | case SSH_CHANNEL_ABANDONED: |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 249 | case SSH_CHANNEL_MUX_PROXY: |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 250 | return (c); |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 251 | } |
| 252 | logit("Non-public channel %d, type %d.", id, c->type); |
| 253 | return (NULL); |
| 254 | } |
| 255 | |
| 256 | /* |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 257 | * Register filedescriptors for a channel, used when allocating a channel or |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 258 | * when the channel consumer/producer is ready, e.g. shell exec'd |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 259 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 260 | static void |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 261 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
Darren Tucker | ed3cdc0 | 2008-06-16 23:29:18 +1000 | [diff] [blame] | 262 | int extusage, int nonblock, int is_tty) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 263 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 264 | /* Update the maximum file descriptor value. */ |
deraadt@openbsd.org | 9136ec1 | 2016-09-12 01:22:38 +0000 | [diff] [blame] | 265 | channel_max_fd = MAXIMUM(channel_max_fd, rfd); |
| 266 | channel_max_fd = MAXIMUM(channel_max_fd, wfd); |
| 267 | channel_max_fd = MAXIMUM(channel_max_fd, efd); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 268 | |
Darren Tucker | 6e7fe1c | 2010-01-08 17:07:22 +1100 | [diff] [blame] | 269 | if (rfd != -1) |
| 270 | fcntl(rfd, F_SETFD, FD_CLOEXEC); |
| 271 | if (wfd != -1 && wfd != rfd) |
| 272 | fcntl(wfd, F_SETFD, FD_CLOEXEC); |
| 273 | if (efd != -1 && efd != rfd && efd != wfd) |
| 274 | fcntl(efd, F_SETFD, FD_CLOEXEC); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 275 | |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 276 | c->rfd = rfd; |
| 277 | c->wfd = wfd; |
| 278 | c->sock = (rfd == wfd) ? rfd : -1; |
| 279 | c->efd = efd; |
| 280 | c->extended_usage = extusage; |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 281 | |
Darren Tucker | ed3cdc0 | 2008-06-16 23:29:18 +1000 | [diff] [blame] | 282 | if ((c->isatty = is_tty) != 0) |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 283 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
Damien Miller | c192a4c | 2013-08-01 14:29:20 +1000 | [diff] [blame] | 284 | #ifdef _AIX |
| 285 | /* XXX: Later AIX versions can't push as much data to tty */ |
Darren Tucker | 1a48aec | 2008-06-16 23:35:56 +1000 | [diff] [blame] | 286 | c->wfd_isatty = is_tty || isatty(c->wfd); |
Damien Miller | c192a4c | 2013-08-01 14:29:20 +1000 | [diff] [blame] | 287 | #endif |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 288 | |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 289 | /* enable nonblocking mode */ |
| 290 | if (nonblock) { |
| 291 | if (rfd != -1) |
| 292 | set_nonblock(rfd); |
| 293 | if (wfd != -1) |
| 294 | set_nonblock(wfd); |
| 295 | if (efd != -1) |
| 296 | set_nonblock(efd); |
| 297 | } |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 298 | } |
| 299 | |
| 300 | /* |
| 301 | * Allocate a new channel object and set its type and socket. This will cause |
| 302 | * remote_name to be freed. |
| 303 | */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 304 | Channel * |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 305 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
Ben Lindstrom | 4fed2be | 2002-06-25 23:17:36 +0000 | [diff] [blame] | 306 | 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] | 307 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 308 | int found; |
| 309 | u_int i; |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 310 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 311 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 312 | /* Do initial allocation if this is the first call. */ |
| 313 | if (channels_alloc == 0) { |
| 314 | channels_alloc = 10; |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 315 | channels = xcalloc(channels_alloc, sizeof(Channel *)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 316 | for (i = 0; i < channels_alloc; i++) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 317 | channels[i] = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 318 | } |
| 319 | /* Try to find a free slot where to put the new channel. */ |
| 320 | for (found = -1, i = 0; i < channels_alloc; i++) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 321 | if (channels[i] == NULL) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 322 | /* Found a free slot. */ |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 323 | found = (int)i; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 324 | break; |
| 325 | } |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 326 | if (found < 0) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 327 | /* 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] | 328 | found = channels_alloc; |
Damien Miller | 9403aa2 | 2002-06-26 19:14:43 +1000 | [diff] [blame] | 329 | if (channels_alloc > 10000) |
| 330 | fatal("channel_new: internal error: channels_alloc %d " |
| 331 | "too big.", channels_alloc); |
deraadt@openbsd.org | 657a5fb | 2015-04-24 01:36:00 +0000 | [diff] [blame] | 332 | channels = xreallocarray(channels, channels_alloc + 10, |
Damien Miller | 3681209 | 2006-03-26 14:22:47 +1100 | [diff] [blame] | 333 | sizeof(Channel *)); |
Damien Miller | 5efcecc | 2003-09-17 07:31:14 +1000 | [diff] [blame] | 334 | channels_alloc += 10; |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 335 | debug2("channel: expanding %d", channels_alloc); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 336 | for (i = found; i < channels_alloc; i++) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 337 | channels[i] = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 338 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 339 | /* Initialize and return new channel. */ |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 340 | c = channels[found] = xcalloc(1, sizeof(Channel)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 341 | buffer_init(&c->input); |
| 342 | buffer_init(&c->output); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 343 | buffer_init(&c->extended); |
Damien Miller | a1c1b6c | 2009-01-28 16:29:49 +1100 | [diff] [blame] | 344 | c->path = NULL; |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 345 | c->listening_addr = NULL; |
| 346 | c->listening_port = 0; |
Damien Miller | 5144df9 | 2002-01-22 23:28:45 +1100 | [diff] [blame] | 347 | c->ostate = CHAN_OUTPUT_OPEN; |
| 348 | c->istate = CHAN_INPUT_OPEN; |
| 349 | c->flags = 0; |
Damien Miller | d310d51 | 2008-06-16 07:59:23 +1000 | [diff] [blame] | 350 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, 0); |
Damien Miller | a650875 | 2012-04-22 11:21:10 +1000 | [diff] [blame] | 351 | c->notbefore = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 352 | c->self = found; |
| 353 | c->type = type; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 354 | c->ctype = ctype; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 355 | c->local_window = window; |
| 356 | c->local_window_max = window; |
| 357 | c->local_consumed = 0; |
| 358 | c->local_maxpacket = maxpack; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 359 | c->remote_id = -1; |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 360 | c->remote_name = xstrdup(remote_name); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 361 | c->remote_window = 0; |
| 362 | c->remote_maxpacket = 0; |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 363 | c->force_drain = 0; |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 364 | c->single_connection = 0; |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 365 | c->detach_user = NULL; |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 366 | c->detach_close = 0; |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 367 | c->open_confirm = NULL; |
| 368 | c->open_confirm_ctx = NULL; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 369 | c->input_filter = NULL; |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 370 | c->output_filter = NULL; |
Darren Tucker | 84c56f5 | 2008-06-13 04:55:46 +1000 | [diff] [blame] | 371 | c->filter_ctx = NULL; |
| 372 | c->filter_cleanup = NULL; |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 373 | c->ctl_chan = -1; |
| 374 | c->mux_rcb = NULL; |
| 375 | c->mux_ctx = NULL; |
Damien Miller | d530f5f | 2010-05-21 14:57:10 +1000 | [diff] [blame] | 376 | c->mux_pause = 0; |
Darren Tucker | 876045b | 2010-01-08 17:08:00 +1100 | [diff] [blame] | 377 | c->delayed = 1; /* prevent call to channel_post handler */ |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 378 | TAILQ_INIT(&c->status_confirms); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 379 | debug("channel %d: new [%s]", found, remote_name); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 380 | return c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 381 | } |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 382 | |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 383 | static int |
| 384 | channel_find_maxfd(void) |
| 385 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 386 | u_int i; |
| 387 | int max = 0; |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 388 | Channel *c; |
| 389 | |
| 390 | for (i = 0; i < channels_alloc; i++) { |
| 391 | c = channels[i]; |
| 392 | if (c != NULL) { |
deraadt@openbsd.org | 9136ec1 | 2016-09-12 01:22:38 +0000 | [diff] [blame] | 393 | max = MAXIMUM(max, c->rfd); |
| 394 | max = MAXIMUM(max, c->wfd); |
| 395 | max = MAXIMUM(max, c->efd); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 396 | } |
| 397 | } |
| 398 | return max; |
| 399 | } |
| 400 | |
| 401 | int |
| 402 | channel_close_fd(int *fdp) |
| 403 | { |
| 404 | int ret = 0, fd = *fdp; |
| 405 | |
| 406 | if (fd != -1) { |
| 407 | ret = close(fd); |
| 408 | *fdp = -1; |
| 409 | if (fd == channel_max_fd) |
| 410 | channel_max_fd = channel_find_maxfd(); |
| 411 | } |
| 412 | return ret; |
| 413 | } |
| 414 | |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 415 | /* Close all channel fd/socket. */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 416 | static void |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 417 | channel_close_fds(Channel *c) |
| 418 | { |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 419 | channel_close_fd(&c->sock); |
| 420 | channel_close_fd(&c->rfd); |
| 421 | channel_close_fd(&c->wfd); |
| 422 | channel_close_fd(&c->efd); |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 423 | } |
| 424 | |
| 425 | /* Free the channel and close its fd/socket. */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 426 | void |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 427 | channel_free(Channel *c) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 428 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 429 | char *s; |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 430 | u_int i, n; |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 431 | Channel *other; |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 432 | struct channel_confirm *cc; |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 433 | |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 434 | for (n = 0, i = 0; i < channels_alloc; i++) { |
| 435 | if ((other = channels[i]) != NULL) { |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 436 | n++; |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 437 | |
| 438 | /* detach from mux client and prepare for closing */ |
| 439 | if (c->type == SSH_CHANNEL_MUX_CLIENT && |
| 440 | other->type == SSH_CHANNEL_MUX_PROXY && |
| 441 | other->mux_ctx == c) { |
| 442 | other->mux_ctx = NULL; |
| 443 | other->type = SSH_CHANNEL_OPEN; |
| 444 | other->istate = CHAN_INPUT_CLOSED; |
| 445 | other->ostate = CHAN_OUTPUT_CLOSED; |
| 446 | } |
| 447 | } |
| 448 | } |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 449 | debug("channel %d: free: %s, nchannels %u", c->self, |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 450 | c->remote_name ? c->remote_name : "???", n); |
Ben Lindstrom | 6c3ae2b | 2000-12-30 03:25:14 +0000 | [diff] [blame] | 451 | |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 452 | /* XXX more MUX cleanup: remove remote forwardings */ |
| 453 | if (c->type == SSH_CHANNEL_MUX_CLIENT) { |
| 454 | for (i = 0; i < (u_int)num_permitted_opens; i++) { |
| 455 | if (permitted_opens[i].downstream != c) |
| 456 | continue; |
| 457 | /* cancel on the server, since mux client is gone */ |
| 458 | debug("channel %d: cleanup remote forward for %s:%u", |
| 459 | c->self, |
| 460 | permitted_opens[i].listen_host, |
| 461 | permitted_opens[i].listen_port); |
| 462 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
| 463 | packet_put_cstring("cancel-tcpip-forward"); |
| 464 | packet_put_char(0); |
| 465 | packet_put_cstring(channel_rfwd_bind_host( |
| 466 | permitted_opens[i].listen_host)); |
| 467 | packet_put_int(permitted_opens[i].listen_port); |
| 468 | packet_send(); |
| 469 | /* unregister */ |
| 470 | permitted_opens[i].listen_port = 0; |
| 471 | permitted_opens[i].port_to_connect = 0; |
| 472 | free(permitted_opens[i].host_to_connect); |
| 473 | permitted_opens[i].host_to_connect = NULL; |
| 474 | free(permitted_opens[i].listen_host); |
| 475 | permitted_opens[i].listen_host = NULL; |
| 476 | permitted_opens[i].listen_path = NULL; |
| 477 | permitted_opens[i].downstream = NULL; |
| 478 | } |
| 479 | } |
| 480 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 481 | s = channel_open_message(); |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 482 | debug3("channel %d: status: %s", c->self, s); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 483 | free(s); |
Ben Lindstrom | 6c3ae2b | 2000-12-30 03:25:14 +0000 | [diff] [blame] | 484 | |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 485 | if (c->sock != -1) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 486 | shutdown(c->sock, SHUT_RDWR); |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 487 | channel_close_fds(c); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 488 | buffer_free(&c->input); |
| 489 | buffer_free(&c->output); |
| 490 | buffer_free(&c->extended); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 491 | free(c->remote_name); |
| 492 | c->remote_name = NULL; |
| 493 | free(c->path); |
| 494 | c->path = NULL; |
| 495 | free(c->listening_addr); |
| 496 | c->listening_addr = NULL; |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 497 | while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) { |
| 498 | if (cc->abandon_cb != NULL) |
| 499 | cc->abandon_cb(c, cc->ctx); |
| 500 | TAILQ_REMOVE(&c->status_confirms, cc, entry); |
Damien Miller | 1d2c456 | 2014-02-04 11:18:20 +1100 | [diff] [blame] | 501 | explicit_bzero(cc, sizeof(*cc)); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 502 | free(cc); |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 503 | } |
Darren Tucker | 84c56f5 | 2008-06-13 04:55:46 +1000 | [diff] [blame] | 504 | if (c->filter_cleanup != NULL && c->filter_ctx != NULL) |
| 505 | c->filter_cleanup(c->self, c->filter_ctx); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 506 | channels[c->self] = NULL; |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 507 | free(c); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 508 | } |
| 509 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 510 | void |
Ben Lindstrom | 601e436 | 2001-06-21 03:19:23 +0000 | [diff] [blame] | 511 | channel_free_all(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 512 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 513 | u_int i; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 514 | |
Ben Lindstrom | 601e436 | 2001-06-21 03:19:23 +0000 | [diff] [blame] | 515 | for (i = 0; i < channels_alloc; i++) |
| 516 | if (channels[i] != NULL) |
| 517 | channel_free(channels[i]); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 518 | } |
| 519 | |
| 520 | /* |
| 521 | * Closes the sockets/fds of all channels. This is used to close extra file |
| 522 | * descriptors after a fork. |
| 523 | */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 524 | void |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 525 | channel_close_all(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 526 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 527 | u_int i; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 528 | |
| 529 | for (i = 0; i < channels_alloc; i++) |
| 530 | if (channels[i] != NULL) |
| 531 | channel_close_fds(channels[i]); |
| 532 | } |
| 533 | |
| 534 | /* |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 535 | * Stop listening to channels. |
| 536 | */ |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 537 | void |
| 538 | channel_stop_listening(void) |
| 539 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 540 | u_int i; |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 541 | Channel *c; |
| 542 | |
| 543 | for (i = 0; i < channels_alloc; i++) { |
| 544 | c = channels[i]; |
| 545 | if (c != NULL) { |
| 546 | switch (c->type) { |
| 547 | case SSH_CHANNEL_AUTH_SOCKET: |
| 548 | case SSH_CHANNEL_PORT_LISTENER: |
| 549 | case SSH_CHANNEL_RPORT_LISTENER: |
| 550 | case SSH_CHANNEL_X11_LISTENER: |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 551 | case SSH_CHANNEL_UNIX_LISTENER: |
| 552 | case SSH_CHANNEL_RUNIX_LISTENER: |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 553 | channel_close_fd(&c->sock); |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 554 | channel_free(c); |
| 555 | break; |
| 556 | } |
| 557 | } |
| 558 | } |
| 559 | } |
| 560 | |
| 561 | /* |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 562 | * Returns true if no channel has too much buffered data, and false if one or |
| 563 | * more channel is overfull. |
| 564 | */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 565 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 566 | channel_not_very_much_buffered_data(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 567 | { |
| 568 | u_int i; |
| 569 | Channel *c; |
| 570 | |
| 571 | for (i = 0; i < channels_alloc; i++) { |
| 572 | c = channels[i]; |
| 573 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 574 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
Darren Tucker | 502d384 | 2003-06-28 12:38:01 +1000 | [diff] [blame] | 575 | debug2("channel %d: big output buffer %u > %u", |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 576 | c->self, buffer_len(&c->output), |
| 577 | packet_get_maxsize()); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 578 | return 0; |
| 579 | } |
| 580 | } |
| 581 | } |
| 582 | return 1; |
| 583 | } |
| 584 | |
| 585 | /* Returns true if any channel is still open. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 586 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 587 | channel_still_open(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 588 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 589 | u_int i; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 590 | Channel *c; |
| 591 | |
| 592 | for (i = 0; i < channels_alloc; i++) { |
| 593 | c = channels[i]; |
| 594 | if (c == NULL) |
| 595 | continue; |
| 596 | switch (c->type) { |
| 597 | case SSH_CHANNEL_X11_LISTENER: |
| 598 | case SSH_CHANNEL_PORT_LISTENER: |
| 599 | case SSH_CHANNEL_RPORT_LISTENER: |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 600 | case SSH_CHANNEL_MUX_LISTENER: |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 601 | case SSH_CHANNEL_CLOSED: |
| 602 | case SSH_CHANNEL_AUTH_SOCKET: |
| 603 | case SSH_CHANNEL_DYNAMIC: |
| 604 | case SSH_CHANNEL_CONNECTING: |
| 605 | case SSH_CHANNEL_ZOMBIE: |
Damien Miller | 3618709 | 2013-06-10 13:07:11 +1000 | [diff] [blame] | 606 | case SSH_CHANNEL_ABANDONED: |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 607 | case SSH_CHANNEL_UNIX_LISTENER: |
| 608 | case SSH_CHANNEL_RUNIX_LISTENER: |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 609 | continue; |
| 610 | case SSH_CHANNEL_LARVAL: |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 611 | continue; |
| 612 | case SSH_CHANNEL_OPENING: |
| 613 | case SSH_CHANNEL_OPEN: |
| 614 | case SSH_CHANNEL_X11_OPEN: |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 615 | case SSH_CHANNEL_MUX_CLIENT: |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 616 | case SSH_CHANNEL_MUX_PROXY: |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 617 | return 1; |
| 618 | case SSH_CHANNEL_INPUT_DRAINING: |
| 619 | case SSH_CHANNEL_OUTPUT_DRAINING: |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 620 | fatal("cannot happen: OUT_DRAIN"); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 621 | default: |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 622 | fatal("%s: bad channel type %d", __func__, c->type); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 623 | /* NOTREACHED */ |
| 624 | } |
| 625 | } |
| 626 | return 0; |
| 627 | } |
| 628 | |
| 629 | /* Returns the id of an open channel suitable for keepaliving */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 630 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 631 | channel_find_open(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 632 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 633 | u_int i; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 634 | Channel *c; |
| 635 | |
| 636 | for (i = 0; i < channels_alloc; i++) { |
| 637 | c = channels[i]; |
Damien Miller | 3bbd878 | 2004-06-18 22:23:22 +1000 | [diff] [blame] | 638 | if (c == NULL || c->remote_id < 0) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 639 | continue; |
| 640 | switch (c->type) { |
| 641 | case SSH_CHANNEL_CLOSED: |
| 642 | case SSH_CHANNEL_DYNAMIC: |
| 643 | case SSH_CHANNEL_X11_LISTENER: |
| 644 | case SSH_CHANNEL_PORT_LISTENER: |
| 645 | case SSH_CHANNEL_RPORT_LISTENER: |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 646 | case SSH_CHANNEL_MUX_LISTENER: |
| 647 | case SSH_CHANNEL_MUX_CLIENT: |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 648 | case SSH_CHANNEL_MUX_PROXY: |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 649 | case SSH_CHANNEL_OPENING: |
| 650 | case SSH_CHANNEL_CONNECTING: |
| 651 | case SSH_CHANNEL_ZOMBIE: |
Damien Miller | 3618709 | 2013-06-10 13:07:11 +1000 | [diff] [blame] | 652 | case SSH_CHANNEL_ABANDONED: |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 653 | case SSH_CHANNEL_UNIX_LISTENER: |
| 654 | case SSH_CHANNEL_RUNIX_LISTENER: |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 655 | continue; |
| 656 | case SSH_CHANNEL_LARVAL: |
| 657 | case SSH_CHANNEL_AUTH_SOCKET: |
| 658 | case SSH_CHANNEL_OPEN: |
| 659 | case SSH_CHANNEL_X11_OPEN: |
| 660 | return i; |
| 661 | case SSH_CHANNEL_INPUT_DRAINING: |
| 662 | case SSH_CHANNEL_OUTPUT_DRAINING: |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 663 | fatal("cannot happen: OUT_DRAIN"); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 664 | default: |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 665 | fatal("%s: bad channel type %d", __func__, c->type); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 666 | /* NOTREACHED */ |
| 667 | } |
| 668 | } |
| 669 | return -1; |
| 670 | } |
| 671 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 672 | /* |
| 673 | * Returns a message describing the currently open forwarded connections, |
| 674 | * suitable for sending to the client. The message contains crlf pairs for |
| 675 | * newlines. |
| 676 | */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 677 | char * |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 678 | channel_open_message(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 679 | { |
| 680 | Buffer buffer; |
| 681 | Channel *c; |
| 682 | char buf[1024], *cp; |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 683 | u_int i; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 684 | |
| 685 | buffer_init(&buffer); |
| 686 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); |
| 687 | buffer_append(&buffer, buf, strlen(buf)); |
| 688 | for (i = 0; i < channels_alloc; i++) { |
| 689 | c = channels[i]; |
| 690 | if (c == NULL) |
| 691 | continue; |
| 692 | switch (c->type) { |
| 693 | case SSH_CHANNEL_X11_LISTENER: |
| 694 | case SSH_CHANNEL_PORT_LISTENER: |
| 695 | case SSH_CHANNEL_RPORT_LISTENER: |
| 696 | case SSH_CHANNEL_CLOSED: |
| 697 | case SSH_CHANNEL_AUTH_SOCKET: |
| 698 | case SSH_CHANNEL_ZOMBIE: |
Damien Miller | 3618709 | 2013-06-10 13:07:11 +1000 | [diff] [blame] | 699 | case SSH_CHANNEL_ABANDONED: |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 700 | case SSH_CHANNEL_MUX_LISTENER: |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 701 | case SSH_CHANNEL_UNIX_LISTENER: |
| 702 | case SSH_CHANNEL_RUNIX_LISTENER: |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 703 | continue; |
| 704 | case SSH_CHANNEL_LARVAL: |
| 705 | case SSH_CHANNEL_OPENING: |
| 706 | case SSH_CHANNEL_CONNECTING: |
| 707 | case SSH_CHANNEL_DYNAMIC: |
| 708 | case SSH_CHANNEL_OPEN: |
| 709 | case SSH_CHANNEL_X11_OPEN: |
| 710 | case SSH_CHANNEL_INPUT_DRAINING: |
| 711 | case SSH_CHANNEL_OUTPUT_DRAINING: |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 712 | case SSH_CHANNEL_MUX_PROXY: |
| 713 | case SSH_CHANNEL_MUX_CLIENT: |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 714 | snprintf(buf, sizeof buf, |
djm@openbsd.org | b1d38a3 | 2015-10-15 23:51:40 +0000 | [diff] [blame] | 715 | " #%d %.300s (t%d r%d i%u/%d o%u/%d fd %d/%d cc %d)\r\n", |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 716 | c->self, c->remote_name, |
| 717 | c->type, c->remote_id, |
| 718 | c->istate, buffer_len(&c->input), |
| 719 | c->ostate, buffer_len(&c->output), |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 720 | c->rfd, c->wfd, c->ctl_chan); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 721 | buffer_append(&buffer, buf, strlen(buf)); |
| 722 | continue; |
| 723 | default: |
| 724 | fatal("channel_open_message: bad channel type %d", c->type); |
| 725 | /* NOTREACHED */ |
| 726 | } |
| 727 | } |
| 728 | buffer_append(&buffer, "\0", 1); |
djm@openbsd.org | bb005dc | 2014-10-08 22:15:06 +0000 | [diff] [blame] | 729 | cp = xstrdup((char *)buffer_ptr(&buffer)); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 730 | buffer_free(&buffer); |
| 731 | return cp; |
| 732 | } |
| 733 | |
| 734 | void |
| 735 | channel_send_open(int id) |
| 736 | { |
| 737 | Channel *c = channel_lookup(id); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 738 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 739 | if (c == NULL) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 740 | logit("channel_send_open: %d: bad id", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 741 | return; |
| 742 | } |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 743 | debug2("channel %d: send open", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 744 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 745 | packet_put_cstring(c->ctype); |
| 746 | packet_put_int(c->self); |
| 747 | packet_put_int(c->local_window); |
| 748 | packet_put_int(c->local_maxpacket); |
| 749 | packet_send(); |
| 750 | } |
| 751 | |
| 752 | void |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 753 | channel_request_start(int id, char *service, int wantconfirm) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 754 | { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 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_request_start: %d: unknown channel id", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 759 | return; |
| 760 | } |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 761 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 762 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
| 763 | packet_put_int(c->remote_id); |
| 764 | packet_put_cstring(service); |
| 765 | packet_put_char(wantconfirm); |
| 766 | } |
Damien Miller | 4f7becb | 2006-03-26 14:10:14 +1100 | [diff] [blame] | 767 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 768 | void |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 769 | channel_register_status_confirm(int id, channel_confirm_cb *cb, |
| 770 | channel_confirm_abandon_cb *abandon_cb, void *ctx) |
| 771 | { |
| 772 | struct channel_confirm *cc; |
| 773 | Channel *c; |
| 774 | |
| 775 | if ((c = channel_lookup(id)) == NULL) |
| 776 | fatal("channel_register_expect: %d: bad id", id); |
| 777 | |
Damien Miller | 6c81fee | 2013-11-08 12:19:55 +1100 | [diff] [blame] | 778 | cc = xcalloc(1, sizeof(*cc)); |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 779 | cc->cb = cb; |
| 780 | cc->abandon_cb = abandon_cb; |
| 781 | cc->ctx = ctx; |
| 782 | TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry); |
| 783 | } |
| 784 | |
| 785 | void |
Damien Miller | d530f5f | 2010-05-21 14:57:10 +1000 | [diff] [blame] | 786 | channel_register_open_confirm(int id, channel_open_fn *fn, void *ctx) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 787 | { |
| 788 | Channel *c = channel_lookup(id); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 789 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 790 | if (c == NULL) { |
Damien Miller | a009433 | 2008-11-03 19:26:35 +1100 | [diff] [blame] | 791 | logit("channel_register_open_confirm: %d: bad id", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 792 | return; |
| 793 | } |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 794 | c->open_confirm = fn; |
| 795 | c->open_confirm_ctx = ctx; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 796 | } |
Damien Miller | 4f7becb | 2006-03-26 14:10:14 +1100 | [diff] [blame] | 797 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 798 | void |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 799 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 800 | { |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 801 | Channel *c = channel_by_id(id); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 802 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 803 | if (c == NULL) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 804 | logit("channel_register_cleanup: %d: bad id", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 805 | return; |
| 806 | } |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 807 | c->detach_user = fn; |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 808 | c->detach_close = do_close; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 809 | } |
Damien Miller | 4f7becb | 2006-03-26 14:10:14 +1100 | [diff] [blame] | 810 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 811 | void |
| 812 | channel_cancel_cleanup(int id) |
| 813 | { |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 814 | Channel *c = channel_by_id(id); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 815 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 816 | if (c == NULL) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 817 | logit("channel_cancel_cleanup: %d: bad id", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 818 | return; |
| 819 | } |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 820 | c->detach_user = NULL; |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 821 | c->detach_close = 0; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 822 | } |
Damien Miller | 4f7becb | 2006-03-26 14:10:14 +1100 | [diff] [blame] | 823 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 824 | void |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 825 | channel_register_filter(int id, channel_infilter_fn *ifn, |
Darren Tucker | 84c56f5 | 2008-06-13 04:55:46 +1000 | [diff] [blame] | 826 | channel_outfilter_fn *ofn, channel_filter_cleanup_fn *cfn, void *ctx) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 827 | { |
| 828 | Channel *c = channel_lookup(id); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 829 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 830 | if (c == NULL) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 831 | logit("channel_register_filter: %d: bad id", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 832 | return; |
| 833 | } |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 834 | c->input_filter = ifn; |
| 835 | c->output_filter = ofn; |
Darren Tucker | 2fb66ca | 2008-06-13 04:49:33 +1000 | [diff] [blame] | 836 | c->filter_ctx = ctx; |
Darren Tucker | 84c56f5 | 2008-06-13 04:55:46 +1000 | [diff] [blame] | 837 | c->filter_cleanup = cfn; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 838 | } |
| 839 | |
| 840 | void |
| 841 | channel_set_fds(int id, int rfd, int wfd, int efd, |
Darren Tucker | ed3cdc0 | 2008-06-16 23:29:18 +1000 | [diff] [blame] | 842 | int extusage, int nonblock, int is_tty, u_int window_max) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 843 | { |
| 844 | Channel *c = channel_lookup(id); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 845 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 846 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
| 847 | fatal("channel_activate for non-larval channel %d.", id); |
Darren Tucker | ed3cdc0 | 2008-06-16 23:29:18 +1000 | [diff] [blame] | 848 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, is_tty); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 849 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | 2aa0c19 | 2002-02-19 15:20:08 +1100 | [diff] [blame] | 850 | c->local_window = c->local_window_max = window_max; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 851 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
| 852 | packet_put_int(c->remote_id); |
| 853 | packet_put_int(c->local_window); |
| 854 | packet_send(); |
| 855 | } |
| 856 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 857 | /* |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 858 | * 'channel_pre*' are called just before select() to add any bits relevant to |
| 859 | * channels in the select bitmasks. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 860 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 861 | /* |
| 862 | * 'channel_post*': perform any appropriate operations for channels which |
| 863 | * have events pending. |
| 864 | */ |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 865 | typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 866 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
| 867 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; |
| 868 | |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 869 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 870 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 871 | channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 872 | { |
| 873 | FD_SET(c->sock, readset); |
| 874 | } |
| 875 | |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 876 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 877 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 878 | channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 879 | { |
| 880 | debug3("channel %d: waiting for connection", c->self); |
| 881 | FD_SET(c->sock, writeset); |
| 882 | } |
| 883 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 884 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 885 | channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 886 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 887 | if (c->istate == CHAN_INPUT_OPEN && |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 888 | c->remote_window > 0 && |
| 889 | buffer_len(&c->input) < c->remote_window && |
Damien Miller | 499a0d5 | 2006-04-23 12:06:03 +1000 | [diff] [blame] | 890 | buffer_check_alloc(&c->input, CHAN_RBUF)) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 891 | FD_SET(c->rfd, readset); |
| 892 | if (c->ostate == CHAN_OUTPUT_OPEN || |
| 893 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
| 894 | if (buffer_len(&c->output) > 0) { |
| 895 | FD_SET(c->wfd, writeset); |
| 896 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 897 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
Damien Miller | 0dc1bef | 2005-07-17 17:22:45 +1000 | [diff] [blame] | 898 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
| 899 | c->self, c->efd, buffer_len(&c->extended)); |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 900 | else |
| 901 | chan_obuf_empty(c); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 902 | } |
| 903 | } |
| 904 | /** XXX check close conditions, too */ |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 905 | if (c->efd != -1 && !(c->istate == CHAN_INPUT_CLOSED && |
| 906 | c->ostate == CHAN_OUTPUT_CLOSED)) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 907 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
| 908 | buffer_len(&c->extended) > 0) |
| 909 | FD_SET(c->efd, writeset); |
Damien Miller | 8853ca5 | 2010-06-26 10:00:14 +1000 | [diff] [blame] | 910 | else if (c->efd != -1 && !(c->flags & CHAN_EOF_SENT) && |
| 911 | (c->extended_usage == CHAN_EXTENDED_READ || |
| 912 | c->extended_usage == CHAN_EXTENDED_IGNORE) && |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 913 | buffer_len(&c->extended) < c->remote_window) |
| 914 | FD_SET(c->efd, readset); |
| 915 | } |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 916 | /* XXX: What about efd? races? */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 917 | } |
| 918 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 919 | /* |
| 920 | * This is a special state for X11 authentication spoofing. An opened X11 |
| 921 | * connection (when authentication spoofing is being done) remains in this |
| 922 | * state until the first packet has been completely read. The authentication |
| 923 | * data in that packet is then substituted by the real data if it matches the |
| 924 | * fake data, and the channel is put into normal mode. |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 925 | * XXX All this happens at the client side. |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 926 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 927 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 928 | static int |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 929 | x11_open_helper(Buffer *b) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 930 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 931 | u_char *ucp; |
| 932 | u_int proto_len, data_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 933 | |
djm@openbsd.org | 1bf477d | 2015-07-01 02:26:31 +0000 | [diff] [blame] | 934 | /* Is this being called after the refusal deadline? */ |
| 935 | if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) { |
| 936 | verbose("Rejected X11 connection after ForwardX11Timeout " |
| 937 | "expired"); |
| 938 | return -1; |
| 939 | } |
| 940 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 941 | /* Check if the fixed size part of the packet is in buffer. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 942 | if (buffer_len(b) < 12) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 943 | return 0; |
| 944 | |
| 945 | /* Parse the lengths of variable-length fields. */ |
Damien Miller | 708d21c | 2002-01-22 23:18:15 +1100 | [diff] [blame] | 946 | ucp = buffer_ptr(b); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 947 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
| 948 | proto_len = 256 * ucp[6] + ucp[7]; |
| 949 | data_len = 256 * ucp[8] + ucp[9]; |
| 950 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ |
| 951 | proto_len = ucp[6] + 256 * ucp[7]; |
| 952 | data_len = ucp[8] + 256 * ucp[9]; |
| 953 | } else { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 954 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 955 | ucp[0]); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 956 | return -1; |
| 957 | } |
| 958 | |
| 959 | /* Check if the whole packet is in buffer. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 960 | if (buffer_len(b) < |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 961 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
| 962 | return 0; |
| 963 | |
| 964 | /* Check if authentication protocol matches. */ |
| 965 | if (proto_len != strlen(x11_saved_proto) || |
| 966 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 967 | debug2("X11 connection uses different authentication protocol."); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 968 | return -1; |
| 969 | } |
| 970 | /* Check if authentication data matches our fake data. */ |
| 971 | if (data_len != x11_fake_data_len || |
Damien Miller | ea1651c | 2010-07-16 13:58:37 +1000 | [diff] [blame] | 972 | timingsafe_bcmp(ucp + 12 + ((proto_len + 3) & ~3), |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 973 | x11_fake_data, x11_fake_data_len) != 0) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 974 | debug2("X11 auth data does not match fake data."); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 975 | return -1; |
| 976 | } |
| 977 | /* Check fake data length */ |
| 978 | if (x11_fake_data_len != x11_saved_data_len) { |
| 979 | error("X11 fake_data_len %d != saved_data_len %d", |
| 980 | x11_fake_data_len, x11_saved_data_len); |
| 981 | return -1; |
| 982 | } |
| 983 | /* |
| 984 | * Received authentication protocol and data match |
| 985 | * our fake data. Substitute the fake data with real |
| 986 | * data. |
| 987 | */ |
| 988 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), |
| 989 | x11_saved_data, x11_saved_data_len); |
| 990 | return 1; |
| 991 | } |
| 992 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 993 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 994 | channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 995 | { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 996 | int ret = x11_open_helper(&c->output); |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 997 | |
| 998 | /* c->force_drain = 1; */ |
| 999 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1000 | if (ret == 1) { |
| 1001 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1002 | channel_pre_open(c, readset, writeset); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1003 | } else if (ret == -1) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1004 | logit("X11 connection rejected because of wrong authentication."); |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1005 | 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] | 1006 | chan_read_failed(c); |
| 1007 | buffer_clear(&c->input); |
| 1008 | chan_ibuf_empty(c); |
| 1009 | buffer_clear(&c->output); |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 1010 | chan_write_failed(c); |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1011 | 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] | 1012 | } |
| 1013 | } |
| 1014 | |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1015 | static void |
| 1016 | channel_pre_mux_client(Channel *c, fd_set *readset, fd_set *writeset) |
| 1017 | { |
Damien Miller | d530f5f | 2010-05-21 14:57:10 +1000 | [diff] [blame] | 1018 | if (c->istate == CHAN_INPUT_OPEN && !c->mux_pause && |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1019 | buffer_check_alloc(&c->input, CHAN_RBUF)) |
| 1020 | FD_SET(c->rfd, readset); |
| 1021 | if (c->istate == CHAN_INPUT_WAIT_DRAIN) { |
| 1022 | /* clear buffer immediately (discard any partial packet) */ |
| 1023 | buffer_clear(&c->input); |
| 1024 | chan_ibuf_empty(c); |
| 1025 | /* Start output drain. XXX just kill chan? */ |
| 1026 | chan_rcvd_oclose(c); |
| 1027 | } |
| 1028 | if (c->ostate == CHAN_OUTPUT_OPEN || |
| 1029 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
| 1030 | if (buffer_len(&c->output) > 0) |
| 1031 | FD_SET(c->wfd, writeset); |
| 1032 | else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) |
| 1033 | chan_obuf_empty(c); |
| 1034 | } |
| 1035 | } |
| 1036 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1037 | /* try to decode a socks4 header */ |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 1038 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1039 | static int |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1040 | channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1041 | { |
Damien Miller | a10f561 | 2002-09-12 09:49:15 +1000 | [diff] [blame] | 1042 | char *p, *host; |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1043 | u_int len, have, i, found, need; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1044 | char username[256]; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1045 | struct { |
| 1046 | u_int8_t version; |
| 1047 | u_int8_t command; |
| 1048 | u_int16_t dest_port; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1049 | struct in_addr dest_addr; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1050 | } s4_req, s4_rsp; |
| 1051 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1052 | debug2("channel %d: decode socks4", c->self); |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 1053 | |
| 1054 | have = buffer_len(&c->input); |
| 1055 | len = sizeof(s4_req); |
| 1056 | if (have < len) |
| 1057 | return 0; |
djm@openbsd.org | bb005dc | 2014-10-08 22:15:06 +0000 | [diff] [blame] | 1058 | p = (char *)buffer_ptr(&c->input); |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1059 | |
| 1060 | need = 1; |
| 1061 | /* SOCKS4A uses an invalid IP address 0.0.0.x */ |
| 1062 | if (p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] != 0) { |
| 1063 | debug2("channel %d: socks4a request", c->self); |
| 1064 | /* ... and needs an extra string (the hostname) */ |
| 1065 | need = 2; |
| 1066 | } |
| 1067 | /* Check for terminating NUL on the string(s) */ |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 1068 | for (found = 0, i = len; i < have; i++) { |
| 1069 | if (p[i] == '\0') { |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1070 | found++; |
| 1071 | if (found == need) |
| 1072 | break; |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 1073 | } |
| 1074 | if (i > 1024) { |
| 1075 | /* the peer is probably sending garbage */ |
| 1076 | debug("channel %d: decode socks4: too long", |
| 1077 | c->self); |
| 1078 | return -1; |
| 1079 | } |
| 1080 | } |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1081 | if (found < need) |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 1082 | return 0; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1083 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
| 1084 | buffer_get(&c->input, (char *)&s4_req.command, 1); |
| 1085 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1086 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 1087 | have = buffer_len(&c->input); |
djm@openbsd.org | bb005dc | 2014-10-08 22:15:06 +0000 | [diff] [blame] | 1088 | p = (char *)buffer_ptr(&c->input); |
Damien Miller | 1348129 | 2014-02-27 10:18:32 +1100 | [diff] [blame] | 1089 | if (memchr(p, '\0', have) == NULL) |
| 1090 | fatal("channel %d: decode socks4: user not nul terminated", |
| 1091 | c->self); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1092 | len = strlen(p); |
Ben Lindstrom | 6fa9d10 | 2001-04-11 23:08:17 +0000 | [diff] [blame] | 1093 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1094 | len++; /* trailing '\0' */ |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1095 | if (len > have) |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1096 | fatal("channel %d: decode socks4: len %d > have %d", |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1097 | c->self, len, have); |
| 1098 | strlcpy(username, p, sizeof(username)); |
| 1099 | buffer_consume(&c->input, len); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1100 | |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1101 | free(c->path); |
| 1102 | c->path = NULL; |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1103 | if (need == 1) { /* SOCKS4: one string */ |
| 1104 | host = inet_ntoa(s4_req.dest_addr); |
Damien Miller | a1c1b6c | 2009-01-28 16:29:49 +1100 | [diff] [blame] | 1105 | c->path = xstrdup(host); |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1106 | } else { /* SOCKS4A: two strings */ |
| 1107 | have = buffer_len(&c->input); |
djm@openbsd.org | bb005dc | 2014-10-08 22:15:06 +0000 | [diff] [blame] | 1108 | p = (char *)buffer_ptr(&c->input); |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1109 | len = strlen(p); |
| 1110 | debug2("channel %d: decode socks4a: host %s/%d", |
| 1111 | c->self, p, len); |
| 1112 | len++; /* trailing '\0' */ |
| 1113 | if (len > have) |
| 1114 | fatal("channel %d: decode socks4a: len %d > have %d", |
| 1115 | c->self, len, have); |
Damien Miller | a1c1b6c | 2009-01-28 16:29:49 +1100 | [diff] [blame] | 1116 | if (len > NI_MAXHOST) { |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1117 | error("channel %d: hostname \"%.100s\" too long", |
| 1118 | c->self, p); |
| 1119 | return -1; |
| 1120 | } |
Damien Miller | a1c1b6c | 2009-01-28 16:29:49 +1100 | [diff] [blame] | 1121 | c->path = xstrdup(p); |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1122 | buffer_consume(&c->input, len); |
| 1123 | } |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1124 | c->host_port = ntohs(s4_req.dest_port); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1125 | |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1126 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1127 | c->self, c->path, c->host_port, s4_req.command); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1128 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1129 | if (s4_req.command != 1) { |
Damien Miller | 1781f53 | 2009-01-28 16:24:41 +1100 | [diff] [blame] | 1130 | debug("channel %d: cannot handle: %s cn %d", |
| 1131 | c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1132 | return -1; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1133 | } |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1134 | s4_rsp.version = 0; /* vn: 0 for reply */ |
| 1135 | s4_rsp.command = 90; /* cd: req granted */ |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1136 | s4_rsp.dest_port = 0; /* ignored */ |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1137 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
Damien Miller | a0fdce9 | 2006-03-26 14:28:50 +1100 | [diff] [blame] | 1138 | buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1139 | return 1; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1140 | } |
| 1141 | |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1142 | /* try to decode a socks5 header */ |
| 1143 | #define SSH_SOCKS5_AUTHDONE 0x1000 |
| 1144 | #define SSH_SOCKS5_NOAUTH 0x00 |
| 1145 | #define SSH_SOCKS5_IPV4 0x01 |
| 1146 | #define SSH_SOCKS5_DOMAIN 0x03 |
| 1147 | #define SSH_SOCKS5_IPV6 0x04 |
| 1148 | #define SSH_SOCKS5_CONNECT 0x01 |
| 1149 | #define SSH_SOCKS5_SUCCESS 0x00 |
| 1150 | |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 1151 | /* ARGSUSED */ |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1152 | static int |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1153 | channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1154 | { |
| 1155 | struct { |
| 1156 | u_int8_t version; |
| 1157 | u_int8_t command; |
| 1158 | u_int8_t reserved; |
| 1159 | u_int8_t atyp; |
| 1160 | } s5_req, s5_rsp; |
| 1161 | u_int16_t dest_port; |
Damien Miller | ce98654 | 2013-07-18 16:12:44 +1000 | [diff] [blame] | 1162 | char dest_addr[255+1], ntop[INET6_ADDRSTRLEN]; |
| 1163 | u_char *p; |
Damien Miller | 0f07707 | 2006-07-10 22:21:02 +1000 | [diff] [blame] | 1164 | u_int have, need, i, found, nmethods, addrlen, af; |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1165 | |
| 1166 | debug2("channel %d: decode socks5", c->self); |
| 1167 | p = buffer_ptr(&c->input); |
| 1168 | if (p[0] != 0x05) |
| 1169 | return -1; |
| 1170 | have = buffer_len(&c->input); |
| 1171 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { |
| 1172 | /* format: ver | nmethods | methods */ |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 1173 | if (have < 2) |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1174 | return 0; |
| 1175 | nmethods = p[1]; |
| 1176 | if (have < nmethods + 2) |
| 1177 | return 0; |
| 1178 | /* look for method: "NO AUTHENTICATION REQUIRED" */ |
Damien Miller | 8016390 | 2007-01-05 16:30:16 +1100 | [diff] [blame] | 1179 | for (found = 0, i = 2; i < nmethods + 2; i++) { |
Damien Miller | 4dec5d7 | 2006-08-05 11:38:40 +1000 | [diff] [blame] | 1180 | if (p[i] == SSH_SOCKS5_NOAUTH) { |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1181 | found = 1; |
| 1182 | break; |
| 1183 | } |
| 1184 | } |
| 1185 | if (!found) { |
| 1186 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", |
| 1187 | c->self); |
| 1188 | return -1; |
| 1189 | } |
| 1190 | buffer_consume(&c->input, nmethods + 2); |
| 1191 | buffer_put_char(&c->output, 0x05); /* version */ |
| 1192 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ |
| 1193 | FD_SET(c->sock, writeset); |
| 1194 | c->flags |= SSH_SOCKS5_AUTHDONE; |
| 1195 | debug2("channel %d: socks5 auth done", c->self); |
| 1196 | return 0; /* need more */ |
| 1197 | } |
| 1198 | debug2("channel %d: socks5 post auth", c->self); |
| 1199 | if (have < sizeof(s5_req)+1) |
| 1200 | return 0; /* need more */ |
Damien Miller | e3b21a5 | 2006-03-26 14:29:06 +1100 | [diff] [blame] | 1201 | memcpy(&s5_req, p, sizeof(s5_req)); |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1202 | if (s5_req.version != 0x05 || |
| 1203 | s5_req.command != SSH_SOCKS5_CONNECT || |
| 1204 | s5_req.reserved != 0x00) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1205 | debug2("channel %d: only socks5 connect supported", c->self); |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1206 | return -1; |
| 1207 | } |
Darren Tucker | 47eede7 | 2005-03-14 23:08:12 +1100 | [diff] [blame] | 1208 | switch (s5_req.atyp){ |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1209 | case SSH_SOCKS5_IPV4: |
| 1210 | addrlen = 4; |
| 1211 | af = AF_INET; |
| 1212 | break; |
| 1213 | case SSH_SOCKS5_DOMAIN: |
| 1214 | addrlen = p[sizeof(s5_req)]; |
| 1215 | af = -1; |
| 1216 | break; |
| 1217 | case SSH_SOCKS5_IPV6: |
| 1218 | addrlen = 16; |
| 1219 | af = AF_INET6; |
| 1220 | break; |
| 1221 | default: |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1222 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1223 | return -1; |
| 1224 | } |
Damien Miller | 0f07707 | 2006-07-10 22:21:02 +1000 | [diff] [blame] | 1225 | need = sizeof(s5_req) + addrlen + 2; |
| 1226 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) |
| 1227 | need++; |
| 1228 | if (have < need) |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1229 | return 0; |
| 1230 | buffer_consume(&c->input, sizeof(s5_req)); |
| 1231 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) |
| 1232 | buffer_consume(&c->input, 1); /* host string length */ |
Damien Miller | ce98654 | 2013-07-18 16:12:44 +1000 | [diff] [blame] | 1233 | buffer_get(&c->input, &dest_addr, addrlen); |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1234 | buffer_get(&c->input, (char *)&dest_port, 2); |
| 1235 | dest_addr[addrlen] = '\0'; |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1236 | free(c->path); |
| 1237 | c->path = NULL; |
Damien Miller | a1c1b6c | 2009-01-28 16:29:49 +1100 | [diff] [blame] | 1238 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) { |
Damien Miller | 9576ac4 | 2009-01-28 16:30:33 +1100 | [diff] [blame] | 1239 | if (addrlen >= NI_MAXHOST) { |
Damien Miller | a1c1b6c | 2009-01-28 16:29:49 +1100 | [diff] [blame] | 1240 | error("channel %d: dynamic request: socks5 hostname " |
| 1241 | "\"%.100s\" too long", c->self, dest_addr); |
| 1242 | return -1; |
| 1243 | } |
| 1244 | c->path = xstrdup(dest_addr); |
| 1245 | } else { |
| 1246 | if (inet_ntop(af, dest_addr, ntop, sizeof(ntop)) == NULL) |
| 1247 | return -1; |
| 1248 | c->path = xstrdup(ntop); |
| 1249 | } |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1250 | c->host_port = ntohs(dest_port); |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 1251 | |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1252 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1253 | c->self, c->path, c->host_port, s5_req.command); |
| 1254 | |
| 1255 | s5_rsp.version = 0x05; |
| 1256 | s5_rsp.command = SSH_SOCKS5_SUCCESS; |
| 1257 | s5_rsp.reserved = 0; /* ignored */ |
| 1258 | s5_rsp.atyp = SSH_SOCKS5_IPV4; |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1259 | dest_port = 0; /* ignored */ |
| 1260 | |
Damien Miller | a0fdce9 | 2006-03-26 14:28:50 +1100 | [diff] [blame] | 1261 | buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); |
Damien Miller | 13840e0 | 2013-09-14 09:49:43 +1000 | [diff] [blame] | 1262 | buffer_put_int(&c->output, ntohl(INADDR_ANY)); /* bind address */ |
Damien Miller | a0fdce9 | 2006-03-26 14:28:50 +1100 | [diff] [blame] | 1263 | buffer_append(&c->output, &dest_port, sizeof(dest_port)); |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1264 | return 1; |
| 1265 | } |
| 1266 | |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1267 | Channel * |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1268 | channel_connect_stdio_fwd(const char *host_to_connect, u_short port_to_connect, |
| 1269 | int in, int out) |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1270 | { |
| 1271 | Channel *c; |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1272 | |
| 1273 | debug("channel_connect_stdio_fwd %s:%d", host_to_connect, |
| 1274 | port_to_connect); |
| 1275 | |
Darren Tucker | 7ad8dd2 | 2010-01-12 19:40:27 +1100 | [diff] [blame] | 1276 | c = channel_new("stdio-forward", SSH_CHANNEL_OPENING, in, out, |
| 1277 | -1, CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
| 1278 | 0, "stdio-forward", /*nonblock*/0); |
| 1279 | |
| 1280 | c->path = xstrdup(host_to_connect); |
| 1281 | c->host_port = port_to_connect; |
| 1282 | c->listening_port = 0; |
| 1283 | c->force_drain = 1; |
| 1284 | |
| 1285 | channel_register_fds(c, in, out, -1, 0, 1, 0); |
| 1286 | port_open_helper(c, "direct-tcpip"); |
| 1287 | |
| 1288 | return c; |
| 1289 | } |
| 1290 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1291 | /* dynamic port forwarding */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1292 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1293 | channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1294 | { |
| 1295 | u_char *p; |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 1296 | u_int have; |
| 1297 | int ret; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1298 | |
| 1299 | have = buffer_len(&c->input); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1300 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
Ben Lindstrom | c486d88 | 2001-04-11 16:08:34 +0000 | [diff] [blame] | 1301 | /* buffer_dump(&c->input); */ |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1302 | /* check if the fixed size part of the packet is in buffer. */ |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1303 | if (have < 3) { |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1304 | /* need more */ |
| 1305 | FD_SET(c->sock, readset); |
| 1306 | return; |
| 1307 | } |
| 1308 | /* try to guess the protocol */ |
| 1309 | p = buffer_ptr(&c->input); |
| 1310 | switch (p[0]) { |
Ben Lindstrom | 6fa9d10 | 2001-04-11 23:08:17 +0000 | [diff] [blame] | 1311 | case 0x04: |
| 1312 | ret = channel_decode_socks4(c, readset, writeset); |
| 1313 | break; |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1314 | case 0x05: |
| 1315 | ret = channel_decode_socks5(c, readset, writeset); |
| 1316 | break; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1317 | default: |
| 1318 | ret = -1; |
| 1319 | break; |
| 1320 | } |
| 1321 | if (ret < 0) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1322 | chan_mark_dead(c); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1323 | } else if (ret == 0) { |
| 1324 | debug2("channel %d: pre_dynamic: need more", c->self); |
| 1325 | /* need more */ |
| 1326 | FD_SET(c->sock, readset); |
| 1327 | } else { |
| 1328 | /* switch to the next state */ |
| 1329 | c->type = SSH_CHANNEL_OPENING; |
| 1330 | port_open_helper(c, "direct-tcpip"); |
| 1331 | } |
| 1332 | } |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1333 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1334 | /* This is our fake X11 server socket. */ |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 1335 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1336 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1337 | channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1338 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1339 | Channel *nc; |
Damien Miller | 163886f | 2008-07-14 11:28:58 +1000 | [diff] [blame] | 1340 | struct sockaddr_storage addr; |
Damien Miller | 37f1c08 | 2013-04-23 15:20:43 +1000 | [diff] [blame] | 1341 | int newsock, oerrno; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1342 | socklen_t addrlen; |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1343 | char buf[16384], *remote_ipaddr; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1344 | int remote_port; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1345 | |
| 1346 | if (FD_ISSET(c->sock, readset)) { |
| 1347 | debug("X11 connection requested."); |
| 1348 | addrlen = sizeof(addr); |
Damien Miller | 163886f | 2008-07-14 11:28:58 +1000 | [diff] [blame] | 1349 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 1350 | if (c->single_connection) { |
Damien Miller | 37f1c08 | 2013-04-23 15:20:43 +1000 | [diff] [blame] | 1351 | oerrno = errno; |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1352 | debug2("single_connection: closing X11 listener."); |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 1353 | channel_close_fd(&c->sock); |
| 1354 | chan_mark_dead(c); |
Damien Miller | 37f1c08 | 2013-04-23 15:20:43 +1000 | [diff] [blame] | 1355 | errno = oerrno; |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 1356 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1357 | if (newsock < 0) { |
Damien Miller | 37f1c08 | 2013-04-23 15:20:43 +1000 | [diff] [blame] | 1358 | if (errno != EINTR && errno != EWOULDBLOCK && |
| 1359 | errno != ECONNABORTED) |
| 1360 | error("accept: %.100s", strerror(errno)); |
Damien Miller | a650875 | 2012-04-22 11:21:10 +1000 | [diff] [blame] | 1361 | if (errno == EMFILE || errno == ENFILE) |
Darren Tucker | b759c9c | 2013-06-02 07:46:16 +1000 | [diff] [blame] | 1362 | c->notbefore = monotime() + 1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1363 | return; |
| 1364 | } |
Damien Miller | 398e1cf | 2002-02-05 11:52:13 +1100 | [diff] [blame] | 1365 | set_nodelay(newsock); |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1366 | remote_ipaddr = get_peer_ipaddr(newsock); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1367 | remote_port = get_peer_port(newsock); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1368 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1369 | remote_ipaddr, remote_port); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1370 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1371 | nc = channel_new("accepted x11 socket", |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1372 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 1373 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 1374 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 1375 | packet_put_cstring("x11"); |
| 1376 | packet_put_int(nc->self); |
| 1377 | packet_put_int(nc->local_window_max); |
| 1378 | packet_put_int(nc->local_maxpacket); |
| 1379 | /* originator ipaddr and port */ |
| 1380 | packet_put_cstring(remote_ipaddr); |
| 1381 | if (datafellows & SSH_BUG_X11FWD) { |
| 1382 | debug2("ssh2 x11 bug compat mode"); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1383 | } else { |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 1384 | packet_put_int(remote_port); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1385 | } |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 1386 | packet_send(); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1387 | free(remote_ipaddr); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1388 | } |
| 1389 | } |
| 1390 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1391 | static void |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1392 | port_open_helper(Channel *c, char *rtype) |
| 1393 | { |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1394 | char buf[1024]; |
Damien Miller | 4def184 | 2013-12-29 17:45:26 +1100 | [diff] [blame] | 1395 | char *local_ipaddr = get_local_ipaddr(c->sock); |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1396 | int local_port = c->sock == -1 ? 65536 : get_local_port(c->sock); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1397 | char *remote_ipaddr = get_peer_ipaddr(c->sock); |
Damien Miller | 677257f | 2005-06-17 12:55:03 +1000 | [diff] [blame] | 1398 | int remote_port = get_peer_port(c->sock); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1399 | |
Damien Miller | d636943 | 2010-02-02 17:02:07 +1100 | [diff] [blame] | 1400 | if (remote_port == -1) { |
| 1401 | /* Fake addr/port to appease peers that validate it (Tectia) */ |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1402 | free(remote_ipaddr); |
Damien Miller | d636943 | 2010-02-02 17:02:07 +1100 | [diff] [blame] | 1403 | remote_ipaddr = xstrdup("127.0.0.1"); |
| 1404 | remote_port = 65535; |
| 1405 | } |
| 1406 | |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1407 | snprintf(buf, sizeof buf, |
| 1408 | "%s: listening port %d for %.100s port %d, " |
Damien Miller | 4def184 | 2013-12-29 17:45:26 +1100 | [diff] [blame] | 1409 | "connect from %.200s port %d to %.100s port %d", |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1410 | rtype, c->listening_port, c->path, c->host_port, |
Damien Miller | 4def184 | 2013-12-29 17:45:26 +1100 | [diff] [blame] | 1411 | remote_ipaddr, remote_port, local_ipaddr, local_port); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1412 | |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1413 | free(c->remote_name); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1414 | c->remote_name = xstrdup(buf); |
| 1415 | |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 1416 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 1417 | packet_put_cstring(rtype); |
| 1418 | packet_put_int(c->self); |
| 1419 | packet_put_int(c->local_window_max); |
| 1420 | packet_put_int(c->local_maxpacket); |
| 1421 | if (strcmp(rtype, "direct-tcpip") == 0) { |
| 1422 | /* target host, port */ |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1423 | packet_put_cstring(c->path); |
| 1424 | packet_put_int(c->host_port); |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 1425 | } else if (strcmp(rtype, "direct-streamlocal@openssh.com") == 0) { |
| 1426 | /* target path */ |
| 1427 | packet_put_cstring(c->path); |
| 1428 | } else if (strcmp(rtype, "forwarded-streamlocal@openssh.com") == 0) { |
| 1429 | /* listen path */ |
| 1430 | packet_put_cstring(c->path); |
| 1431 | } else { |
| 1432 | /* listen address, port */ |
| 1433 | packet_put_cstring(c->path); |
| 1434 | packet_put_int(local_port); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1435 | } |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 1436 | if (strcmp(rtype, "forwarded-streamlocal@openssh.com") == 0) { |
| 1437 | /* reserved for future owner/mode info */ |
| 1438 | packet_put_cstring(""); |
| 1439 | } else { |
| 1440 | /* originator host and port */ |
| 1441 | packet_put_cstring(remote_ipaddr); |
| 1442 | packet_put_int((u_int)remote_port); |
| 1443 | } |
| 1444 | packet_send(); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1445 | free(remote_ipaddr); |
Damien Miller | 4def184 | 2013-12-29 17:45:26 +1100 | [diff] [blame] | 1446 | free(local_ipaddr); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1447 | } |
| 1448 | |
Damien Miller | 5e7fd07 | 2005-11-05 14:53:39 +1100 | [diff] [blame] | 1449 | static void |
| 1450 | channel_set_reuseaddr(int fd) |
| 1451 | { |
| 1452 | int on = 1; |
| 1453 | |
| 1454 | /* |
| 1455 | * Set socket options. |
| 1456 | * Allow local port reuse in TIME_WAIT. |
| 1457 | */ |
| 1458 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) |
| 1459 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); |
| 1460 | } |
| 1461 | |
djm@openbsd.org | 1bf477d | 2015-07-01 02:26:31 +0000 | [diff] [blame] | 1462 | void |
| 1463 | channel_set_x11_refuse_time(u_int refuse_time) |
| 1464 | { |
| 1465 | x11_refuse_time = refuse_time; |
| 1466 | } |
| 1467 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1468 | /* |
| 1469 | * This socket is listening for connections to a forwarded TCP/IP port. |
| 1470 | */ |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 1471 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1472 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1473 | channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1474 | { |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1475 | Channel *nc; |
Damien Miller | 163886f | 2008-07-14 11:28:58 +1000 | [diff] [blame] | 1476 | struct sockaddr_storage addr; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1477 | int newsock, nextstate; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1478 | socklen_t addrlen; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1479 | char *rtype; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1480 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1481 | if (FD_ISSET(c->sock, readset)) { |
| 1482 | debug("Connection to port %d forwarding " |
| 1483 | "to %.100s port %d requested.", |
| 1484 | c->listening_port, c->path, c->host_port); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1485 | |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1486 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
| 1487 | nextstate = SSH_CHANNEL_OPENING; |
| 1488 | rtype = "forwarded-tcpip"; |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1489 | } else if (c->type == SSH_CHANNEL_RUNIX_LISTENER) { |
| 1490 | nextstate = SSH_CHANNEL_OPENING; |
| 1491 | rtype = "forwarded-streamlocal@openssh.com"; |
| 1492 | } else if (c->host_port == PORT_STREAMLOCAL) { |
| 1493 | nextstate = SSH_CHANNEL_OPENING; |
| 1494 | rtype = "direct-streamlocal@openssh.com"; |
| 1495 | } else if (c->host_port == 0) { |
| 1496 | nextstate = SSH_CHANNEL_DYNAMIC; |
| 1497 | rtype = "dynamic-tcpip"; |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1498 | } else { |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1499 | nextstate = SSH_CHANNEL_OPENING; |
| 1500 | rtype = "direct-tcpip"; |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1501 | } |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1502 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1503 | addrlen = sizeof(addr); |
Damien Miller | 163886f | 2008-07-14 11:28:58 +1000 | [diff] [blame] | 1504 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1505 | if (newsock < 0) { |
Damien Miller | 37f1c08 | 2013-04-23 15:20:43 +1000 | [diff] [blame] | 1506 | if (errno != EINTR && errno != EWOULDBLOCK && |
| 1507 | errno != ECONNABORTED) |
| 1508 | error("accept: %.100s", strerror(errno)); |
Damien Miller | a650875 | 2012-04-22 11:21:10 +1000 | [diff] [blame] | 1509 | if (errno == EMFILE || errno == ENFILE) |
Darren Tucker | b759c9c | 2013-06-02 07:46:16 +1000 | [diff] [blame] | 1510 | c->notbefore = monotime() + 1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1511 | return; |
| 1512 | } |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1513 | if (c->host_port != PORT_STREAMLOCAL) |
| 1514 | set_nodelay(newsock); |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 1515 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
| 1516 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1517 | nc->listening_port = c->listening_port; |
| 1518 | nc->host_port = c->host_port; |
Damien Miller | a1c1b6c | 2009-01-28 16:29:49 +1100 | [diff] [blame] | 1519 | if (c->path != NULL) |
| 1520 | nc->path = xstrdup(c->path); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1521 | |
Darren Tucker | 876045b | 2010-01-08 17:08:00 +1100 | [diff] [blame] | 1522 | if (nextstate != SSH_CHANNEL_DYNAMIC) |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1523 | port_open_helper(nc, rtype); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1524 | } |
| 1525 | } |
| 1526 | |
| 1527 | /* |
| 1528 | * This is the authentication agent socket listening for connections from |
| 1529 | * clients. |
| 1530 | */ |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 1531 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1532 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1533 | channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1534 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1535 | Channel *nc; |
| 1536 | int newsock; |
Damien Miller | 163886f | 2008-07-14 11:28:58 +1000 | [diff] [blame] | 1537 | struct sockaddr_storage addr; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1538 | socklen_t addrlen; |
| 1539 | |
| 1540 | if (FD_ISSET(c->sock, readset)) { |
| 1541 | addrlen = sizeof(addr); |
Damien Miller | 163886f | 2008-07-14 11:28:58 +1000 | [diff] [blame] | 1542 | newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1543 | if (newsock < 0) { |
Damien Miller | a650875 | 2012-04-22 11:21:10 +1000 | [diff] [blame] | 1544 | error("accept from auth socket: %.100s", |
| 1545 | strerror(errno)); |
| 1546 | if (errno == EMFILE || errno == ENFILE) |
Darren Tucker | b759c9c | 2013-06-02 07:46:16 +1000 | [diff] [blame] | 1547 | c->notbefore = monotime() + 1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1548 | return; |
| 1549 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1550 | nc = channel_new("accepted auth socket", |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1551 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
| 1552 | c->local_window_max, c->local_maxpacket, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 1553 | 0, "accepted auth socket", 1); |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 1554 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 1555 | packet_put_cstring("auth-agent@openssh.com"); |
| 1556 | packet_put_int(nc->self); |
| 1557 | packet_put_int(c->local_window_max); |
| 1558 | packet_put_int(c->local_maxpacket); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1559 | packet_send(); |
| 1560 | } |
| 1561 | } |
| 1562 | |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 1563 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1564 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1565 | channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1566 | { |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 1567 | int err = 0, sock; |
Ben Lindstrom | 1118095 | 2001-07-04 05:13:35 +0000 | [diff] [blame] | 1568 | socklen_t sz = sizeof(err); |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1569 | |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1570 | if (FD_ISSET(c->sock, writeset)) { |
Ben Lindstrom | 733a235 | 2002-03-05 01:31:28 +0000 | [diff] [blame] | 1571 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1572 | err = errno; |
| 1573 | error("getsockopt SO_ERROR failed"); |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1574 | } |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1575 | if (err == 0) { |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 1576 | debug("channel %d: connected to %s port %d", |
| 1577 | c->self, c->connect_ctx.host, c->connect_ctx.port); |
| 1578 | channel_connect_ctx_free(&c->connect_ctx); |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1579 | c->type = SSH_CHANNEL_OPEN; |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 1580 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1581 | packet_put_int(c->remote_id); |
| 1582 | packet_put_int(c->self); |
| 1583 | packet_put_int(c->local_window); |
| 1584 | packet_put_int(c->local_maxpacket); |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1585 | } else { |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 1586 | debug("channel %d: connection failed: %s", |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1587 | c->self, strerror(err)); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 1588 | /* Try next address, if any */ |
| 1589 | if ((sock = connect_next(&c->connect_ctx)) > 0) { |
| 1590 | close(c->sock); |
| 1591 | c->sock = c->rfd = c->wfd = sock; |
| 1592 | channel_max_fd = channel_find_maxfd(); |
| 1593 | return; |
| 1594 | } |
| 1595 | /* Exhausted all addresses */ |
| 1596 | error("connect_to %.100s port %d: failed.", |
| 1597 | c->connect_ctx.host, c->connect_ctx.port); |
| 1598 | channel_connect_ctx_free(&c->connect_ctx); |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 1599 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
| 1600 | packet_put_int(c->remote_id); |
| 1601 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); |
| 1602 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
| 1603 | packet_put_cstring(strerror(err)); |
| 1604 | packet_put_cstring(""); |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1605 | } |
| 1606 | chan_mark_dead(c); |
| 1607 | } |
| 1608 | packet_send(); |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1609 | } |
| 1610 | } |
| 1611 | |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 1612 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1613 | static int |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1614 | channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1615 | { |
Darren Tucker | 11327cc | 2005-03-14 23:22:25 +1100 | [diff] [blame] | 1616 | char buf[CHAN_RBUF]; |
Damien Miller | 835284b | 2007-06-11 13:03:16 +1000 | [diff] [blame] | 1617 | int len, force; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1618 | |
Damien Miller | 835284b | 2007-06-11 13:03:16 +1000 | [diff] [blame] | 1619 | force = c->isatty && c->detach_close && c->istate != CHAN_INPUT_CLOSED; |
| 1620 | if (c->rfd != -1 && (force || FD_ISSET(c->rfd, readset))) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 1621 | errno = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1622 | len = read(c->rfd, buf, sizeof(buf)); |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 1623 | if (len < 0 && (errno == EINTR || |
| 1624 | ((errno == EAGAIN || errno == EWOULDBLOCK) && !force))) |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 1625 | return 1; |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 1626 | #ifndef PTY_ZEROREAD |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1627 | if (len <= 0) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 1628 | #else |
Darren Tucker | 144e8d6 | 2006-06-25 08:25:25 +1000 | [diff] [blame] | 1629 | if ((!c->isatty && len <= 0) || |
| 1630 | (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { |
Darren Tucker | 9afe115 | 2006-06-23 21:24:12 +1000 | [diff] [blame] | 1631 | #endif |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1632 | debug2("channel %d: read<=0 rfd %d len %d", |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1633 | c->self, c->rfd, len); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1634 | if (c->type != SSH_CHANNEL_OPEN) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1635 | debug2("channel %d: not open", c->self); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1636 | chan_mark_dead(c); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1637 | return -1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1638 | } else { |
| 1639 | chan_read_failed(c); |
| 1640 | } |
| 1641 | return -1; |
| 1642 | } |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1643 | if (c->input_filter != NULL) { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1644 | if (c->input_filter(c, buf, len) == -1) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1645 | debug2("channel %d: filter stops", c->self); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1646 | chan_read_failed(c); |
| 1647 | } |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1648 | } else if (c->datagram) { |
| 1649 | buffer_put_string(&c->input, buf, len); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1650 | } else { |
| 1651 | buffer_append(&c->input, buf, len); |
| 1652 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1653 | } |
| 1654 | return 1; |
| 1655 | } |
Damien Miller | 4f7becb | 2006-03-26 14:10:14 +1100 | [diff] [blame] | 1656 | |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 1657 | /* ARGSUSED */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1658 | static int |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1659 | channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1660 | { |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 1661 | struct termios tio; |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 1662 | u_char *data = NULL, *buf; |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 1663 | u_int dlen, olen = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1664 | int len; |
| 1665 | |
| 1666 | /* Send buffered output data to the socket. */ |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 1667 | if (c->wfd != -1 && |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1668 | FD_ISSET(c->wfd, writeset) && |
| 1669 | buffer_len(&c->output) > 0) { |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 1670 | olen = buffer_len(&c->output); |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 1671 | if (c->output_filter != NULL) { |
| 1672 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { |
| 1673 | debug2("channel %d: filter stops", c->self); |
Damien Miller | e204f6a | 2006-01-31 21:47:15 +1100 | [diff] [blame] | 1674 | if (c->type != SSH_CHANNEL_OPEN) |
| 1675 | chan_mark_dead(c); |
| 1676 | else |
| 1677 | chan_write_failed(c); |
| 1678 | return -1; |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 1679 | } |
| 1680 | } else if (c->datagram) { |
| 1681 | buf = data = buffer_get_string(&c->output, &dlen); |
| 1682 | } else { |
| 1683 | buf = data = buffer_ptr(&c->output); |
| 1684 | dlen = buffer_len(&c->output); |
| 1685 | } |
| 1686 | |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1687 | if (c->datagram) { |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1688 | /* ignore truncated writes, datagrams might get lost */ |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 1689 | len = write(c->wfd, buf, dlen); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1690 | free(data); |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 1691 | if (len < 0 && (errno == EINTR || errno == EAGAIN || |
| 1692 | errno == EWOULDBLOCK)) |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1693 | return 1; |
| 1694 | if (len <= 0) { |
| 1695 | if (c->type != SSH_CHANNEL_OPEN) |
| 1696 | chan_mark_dead(c); |
| 1697 | else |
| 1698 | chan_write_failed(c); |
| 1699 | return -1; |
| 1700 | } |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 1701 | goto out; |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1702 | } |
Ben Lindstrom | 92ea0ea | 2002-07-04 18:11:09 +0000 | [diff] [blame] | 1703 | #ifdef _AIX |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 1704 | /* XXX: Later AIX versions can't push as much data to tty */ |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 1705 | if (c->wfd_isatty) |
Darren Tucker | 240fdfa | 2003-11-22 14:10:02 +1100 | [diff] [blame] | 1706 | dlen = MIN(dlen, 8*1024); |
Ben Lindstrom | 92ea0ea | 2002-07-04 18:11:09 +0000 | [diff] [blame] | 1707 | #endif |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 1708 | |
| 1709 | len = write(c->wfd, buf, dlen); |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 1710 | if (len < 0 && |
| 1711 | (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 1712 | return 1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1713 | if (len <= 0) { |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1714 | if (c->type != SSH_CHANNEL_OPEN) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1715 | debug2("channel %d: not open", c->self); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1716 | chan_mark_dead(c); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1717 | return -1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1718 | } else { |
| 1719 | chan_write_failed(c); |
| 1720 | } |
| 1721 | return -1; |
| 1722 | } |
Darren Tucker | 3980b63 | 2009-08-28 11:02:37 +1000 | [diff] [blame] | 1723 | #ifndef BROKEN_TCGETATTR_ICANON |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 1724 | if (c->isatty && dlen >= 1 && buf[0] != '\r') { |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1725 | if (tcgetattr(c->wfd, &tio) == 0 && |
| 1726 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { |
| 1727 | /* |
| 1728 | * Simulate echo to reduce the impact of |
Ben Lindstrom | b40204b | 2001-03-05 06:29:44 +0000 | [diff] [blame] | 1729 | * traffic analysis. We need to match the |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 1730 | * size of a SSH2_MSG_CHANNEL_DATA message |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 1731 | * (4 byte channel id + buf) |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1732 | */ |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 1733 | packet_send_ignore(4 + len); |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1734 | packet_send(); |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1735 | } |
| 1736 | } |
Darren Tucker | 3980b63 | 2009-08-28 11:02:37 +1000 | [diff] [blame] | 1737 | #endif |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1738 | buffer_consume(&c->output, len); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1739 | } |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 1740 | out: |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 1741 | if (olen > 0) |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 1742 | c->local_consumed += olen - buffer_len(&c->output); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1743 | return 1; |
| 1744 | } |
Damien Miller | 4f7becb | 2006-03-26 14:10:14 +1100 | [diff] [blame] | 1745 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1746 | static int |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1747 | channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1748 | { |
Darren Tucker | 11327cc | 2005-03-14 23:22:25 +1100 | [diff] [blame] | 1749 | char buf[CHAN_RBUF]; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1750 | int len; |
| 1751 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1752 | /** XXX handle drain efd, too */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1753 | if (c->efd != -1) { |
| 1754 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
| 1755 | FD_ISSET(c->efd, writeset) && |
| 1756 | buffer_len(&c->extended) > 0) { |
| 1757 | len = write(c->efd, buffer_ptr(&c->extended), |
| 1758 | buffer_len(&c->extended)); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1759 | debug2("channel %d: written %d to efd %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1760 | c->self, len, c->efd); |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 1761 | if (len < 0 && (errno == EINTR || errno == EAGAIN || |
| 1762 | errno == EWOULDBLOCK)) |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1763 | return 1; |
| 1764 | if (len <= 0) { |
| 1765 | debug2("channel %d: closing write-efd %d", |
| 1766 | c->self, c->efd); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1767 | channel_close_fd(&c->efd); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1768 | } else { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1769 | buffer_consume(&c->extended, len); |
| 1770 | c->local_consumed += len; |
| 1771 | } |
Damien Miller | 8853ca5 | 2010-06-26 10:00:14 +1000 | [diff] [blame] | 1772 | } else if (c->efd != -1 && |
| 1773 | (c->extended_usage == CHAN_EXTENDED_READ || |
| 1774 | c->extended_usage == CHAN_EXTENDED_IGNORE) && |
Damien Miller | e42bd24 | 2007-01-29 10:16:28 +1100 | [diff] [blame] | 1775 | (c->detach_close || FD_ISSET(c->efd, readset))) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1776 | len = read(c->efd, buf, sizeof(buf)); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1777 | debug2("channel %d: read %d from efd %d", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1778 | c->self, len, c->efd); |
Damien Miller | d8968ad | 2008-07-04 23:10:49 +1000 | [diff] [blame] | 1779 | if (len < 0 && (errno == EINTR || ((errno == EAGAIN || |
| 1780 | errno == EWOULDBLOCK) && !c->detach_close))) |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1781 | return 1; |
| 1782 | if (len <= 0) { |
| 1783 | debug2("channel %d: closing read-efd %d", |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1784 | c->self, c->efd); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1785 | channel_close_fd(&c->efd); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1786 | } else { |
Damien Miller | 8853ca5 | 2010-06-26 10:00:14 +1000 | [diff] [blame] | 1787 | if (c->extended_usage == CHAN_EXTENDED_IGNORE) { |
| 1788 | debug3("channel %d: discard efd", |
| 1789 | c->self); |
| 1790 | } else |
| 1791 | buffer_append(&c->extended, buf, len); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1792 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1793 | } |
| 1794 | } |
| 1795 | return 1; |
| 1796 | } |
Damien Miller | 4f7becb | 2006-03-26 14:10:14 +1100 | [diff] [blame] | 1797 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1798 | static int |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1799 | channel_check_window(Channel *c) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1800 | { |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1801 | if (c->type == SSH_CHANNEL_OPEN && |
| 1802 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && |
Darren Tucker | ae09cb8 | 2007-06-25 19:04:46 +1000 | [diff] [blame] | 1803 | ((c->local_window_max - c->local_window > |
Damien Miller | 3191a8e | 2007-06-11 18:33:15 +1000 | [diff] [blame] | 1804 | c->local_maxpacket*3) || |
| 1805 | c->local_window < c->local_window_max/2) && |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1806 | c->local_consumed > 0) { |
| 1807 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
| 1808 | packet_put_int(c->remote_id); |
| 1809 | packet_put_int(c->local_consumed); |
| 1810 | packet_send(); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1811 | debug2("channel %d: window %d sent adjust %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1812 | c->self, c->local_window, |
| 1813 | c->local_consumed); |
| 1814 | c->local_window += c->local_consumed; |
| 1815 | c->local_consumed = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1816 | } |
| 1817 | return 1; |
| 1818 | } |
| 1819 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1820 | static void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 1821 | channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1822 | { |
| 1823 | channel_handle_rfd(c, readset, writeset); |
| 1824 | channel_handle_wfd(c, readset, writeset); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1825 | channel_handle_efd(c, readset, writeset); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1826 | channel_check_window(c); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1827 | } |
| 1828 | |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1829 | static u_int |
| 1830 | read_mux(Channel *c, u_int need) |
| 1831 | { |
| 1832 | char buf[CHAN_RBUF]; |
| 1833 | int len; |
| 1834 | u_int rlen; |
| 1835 | |
| 1836 | if (buffer_len(&c->input) < need) { |
| 1837 | rlen = need - buffer_len(&c->input); |
deraadt@openbsd.org | 9136ec1 | 2016-09-12 01:22:38 +0000 | [diff] [blame] | 1838 | len = read(c->rfd, buf, MINIMUM(rlen, CHAN_RBUF)); |
naddy@openbsd.org | 603ba41 | 2016-02-05 13:28:19 +0000 | [diff] [blame] | 1839 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
| 1840 | return buffer_len(&c->input); |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1841 | if (len <= 0) { |
naddy@openbsd.org | 603ba41 | 2016-02-05 13:28:19 +0000 | [diff] [blame] | 1842 | debug2("channel %d: ctl read<=0 rfd %d len %d", |
| 1843 | c->self, c->rfd, len); |
| 1844 | chan_read_failed(c); |
| 1845 | return 0; |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1846 | } else |
| 1847 | buffer_append(&c->input, buf, len); |
| 1848 | } |
| 1849 | return buffer_len(&c->input); |
| 1850 | } |
| 1851 | |
| 1852 | static void |
| 1853 | channel_post_mux_client(Channel *c, fd_set *readset, fd_set *writeset) |
| 1854 | { |
| 1855 | u_int need; |
| 1856 | ssize_t len; |
| 1857 | |
Damien Miller | d530f5f | 2010-05-21 14:57:10 +1000 | [diff] [blame] | 1858 | if (c->rfd != -1 && !c->mux_pause && FD_ISSET(c->rfd, readset) && |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1859 | (c->istate == CHAN_INPUT_OPEN || |
| 1860 | c->istate == CHAN_INPUT_WAIT_DRAIN)) { |
| 1861 | /* |
| 1862 | * Don't not read past the precise end of packets to |
| 1863 | * avoid disrupting fd passing. |
| 1864 | */ |
| 1865 | if (read_mux(c, 4) < 4) /* read header */ |
| 1866 | return; |
| 1867 | need = get_u32(buffer_ptr(&c->input)); |
| 1868 | #define CHANNEL_MUX_MAX_PACKET (256 * 1024) |
| 1869 | if (need > CHANNEL_MUX_MAX_PACKET) { |
| 1870 | debug2("channel %d: packet too big %u > %u", |
| 1871 | c->self, CHANNEL_MUX_MAX_PACKET, need); |
| 1872 | chan_rcvd_oclose(c); |
| 1873 | return; |
| 1874 | } |
| 1875 | if (read_mux(c, need + 4) < need + 4) /* read body */ |
| 1876 | return; |
| 1877 | if (c->mux_rcb(c) != 0) { |
| 1878 | debug("channel %d: mux_rcb failed", c->self); |
| 1879 | chan_mark_dead(c); |
| 1880 | return; |
| 1881 | } |
| 1882 | } |
| 1883 | |
| 1884 | if (c->wfd != -1 && FD_ISSET(c->wfd, writeset) && |
| 1885 | buffer_len(&c->output) > 0) { |
| 1886 | len = write(c->wfd, buffer_ptr(&c->output), |
| 1887 | buffer_len(&c->output)); |
| 1888 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
| 1889 | return; |
| 1890 | if (len <= 0) { |
| 1891 | chan_mark_dead(c); |
| 1892 | return; |
| 1893 | } |
| 1894 | buffer_consume(&c->output, len); |
| 1895 | } |
| 1896 | } |
| 1897 | |
| 1898 | static void |
| 1899 | channel_post_mux_listener(Channel *c, fd_set *readset, fd_set *writeset) |
| 1900 | { |
| 1901 | Channel *nc; |
| 1902 | struct sockaddr_storage addr; |
| 1903 | socklen_t addrlen; |
| 1904 | int newsock; |
| 1905 | uid_t euid; |
| 1906 | gid_t egid; |
| 1907 | |
| 1908 | if (!FD_ISSET(c->sock, readset)) |
| 1909 | return; |
| 1910 | |
| 1911 | debug("multiplexing control connection"); |
| 1912 | |
| 1913 | /* |
| 1914 | * Accept connection on control socket |
| 1915 | */ |
| 1916 | memset(&addr, 0, sizeof(addr)); |
| 1917 | addrlen = sizeof(addr); |
| 1918 | if ((newsock = accept(c->sock, (struct sockaddr*)&addr, |
| 1919 | &addrlen)) == -1) { |
| 1920 | error("%s accept: %s", __func__, strerror(errno)); |
Damien Miller | a650875 | 2012-04-22 11:21:10 +1000 | [diff] [blame] | 1921 | if (errno == EMFILE || errno == ENFILE) |
Darren Tucker | b759c9c | 2013-06-02 07:46:16 +1000 | [diff] [blame] | 1922 | c->notbefore = monotime() + 1; |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1923 | return; |
| 1924 | } |
| 1925 | |
| 1926 | if (getpeereid(newsock, &euid, &egid) < 0) { |
| 1927 | error("%s getpeereid failed: %s", __func__, |
| 1928 | strerror(errno)); |
| 1929 | close(newsock); |
| 1930 | return; |
| 1931 | } |
| 1932 | if ((euid != 0) && (getuid() != euid)) { |
| 1933 | error("multiplex uid mismatch: peer euid %u != uid %u", |
| 1934 | (u_int)euid, (u_int)getuid()); |
| 1935 | close(newsock); |
| 1936 | return; |
| 1937 | } |
| 1938 | nc = channel_new("multiplex client", SSH_CHANNEL_MUX_CLIENT, |
| 1939 | newsock, newsock, -1, c->local_window_max, |
| 1940 | c->local_maxpacket, 0, "mux-control", 1); |
| 1941 | nc->mux_rcb = c->mux_rcb; |
| 1942 | debug3("%s: new mux channel %d fd %d", __func__, |
| 1943 | nc->self, nc->sock); |
| 1944 | /* establish state */ |
| 1945 | nc->mux_rcb(nc); |
| 1946 | /* mux state transitions must not elicit protocol messages */ |
| 1947 | nc->flags |= CHAN_LOCAL; |
| 1948 | } |
| 1949 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1950 | static void |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 1951 | channel_handler_init(void) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1952 | { |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 1953 | int i; |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 1954 | |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 1955 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
| 1956 | channel_pre[i] = NULL; |
| 1957 | channel_post[i] = NULL; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1958 | } |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1959 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1960 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1961 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1962 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1963 | channel_pre[SSH_CHANNEL_UNIX_LISTENER] = &channel_pre_listener; |
| 1964 | channel_pre[SSH_CHANNEL_RUNIX_LISTENER] = &channel_pre_listener; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1965 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1966 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1967 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1968 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1969 | channel_pre[SSH_CHANNEL_MUX_LISTENER] = &channel_pre_listener; |
| 1970 | channel_pre[SSH_CHANNEL_MUX_CLIENT] = &channel_pre_mux_client; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1971 | |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1972 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1973 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1974 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 1975 | channel_post[SSH_CHANNEL_UNIX_LISTENER] = &channel_post_port_listener; |
| 1976 | channel_post[SSH_CHANNEL_RUNIX_LISTENER] = &channel_post_port_listener; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1977 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1978 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1979 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1980 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
Damien Miller | e1537f9 | 2010-01-26 13:26:22 +1100 | [diff] [blame] | 1981 | channel_post[SSH_CHANNEL_MUX_LISTENER] = &channel_post_mux_listener; |
| 1982 | channel_post[SSH_CHANNEL_MUX_CLIENT] = &channel_post_mux_client; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1983 | } |
| 1984 | |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1985 | /* gc dead channels */ |
| 1986 | static void |
| 1987 | channel_garbage_collect(Channel *c) |
| 1988 | { |
| 1989 | if (c == NULL) |
| 1990 | return; |
| 1991 | if (c->detach_user != NULL) { |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 1992 | if (!chan_is_dead(c, c->detach_close)) |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1993 | return; |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1994 | debug2("channel %d: gc: notify user", c->self); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1995 | c->detach_user(c->self, NULL); |
| 1996 | /* if we still have a callback */ |
| 1997 | if (c->detach_user != NULL) |
| 1998 | return; |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1999 | debug2("channel %d: gc: user detached", c->self); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2000 | } |
| 2001 | if (!chan_is_dead(c, 1)) |
| 2002 | return; |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 2003 | debug2("channel %d: garbage collecting", c->self); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2004 | channel_free(c); |
| 2005 | } |
| 2006 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2007 | static void |
Damien Miller | a650875 | 2012-04-22 11:21:10 +1000 | [diff] [blame] | 2008 | channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset, |
| 2009 | time_t *unpause_secs) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2010 | { |
| 2011 | static int did_init = 0; |
Darren Tucker | 876045b | 2010-01-08 17:08:00 +1100 | [diff] [blame] | 2012 | u_int i, oalloc; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2013 | Channel *c; |
Damien Miller | a650875 | 2012-04-22 11:21:10 +1000 | [diff] [blame] | 2014 | time_t now; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2015 | |
| 2016 | if (!did_init) { |
| 2017 | channel_handler_init(); |
| 2018 | did_init = 1; |
| 2019 | } |
Darren Tucker | b759c9c | 2013-06-02 07:46:16 +1000 | [diff] [blame] | 2020 | now = monotime(); |
Damien Miller | a650875 | 2012-04-22 11:21:10 +1000 | [diff] [blame] | 2021 | if (unpause_secs != NULL) |
| 2022 | *unpause_secs = 0; |
Darren Tucker | 876045b | 2010-01-08 17:08:00 +1100 | [diff] [blame] | 2023 | for (i = 0, oalloc = channels_alloc; i < oalloc; i++) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2024 | c = channels[i]; |
| 2025 | if (c == NULL) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2026 | continue; |
Darren Tucker | 876045b | 2010-01-08 17:08:00 +1100 | [diff] [blame] | 2027 | if (c->delayed) { |
| 2028 | if (ftab == channel_pre) |
| 2029 | c->delayed = 0; |
| 2030 | else |
| 2031 | continue; |
| 2032 | } |
Damien Miller | a650875 | 2012-04-22 11:21:10 +1000 | [diff] [blame] | 2033 | if (ftab[c->type] != NULL) { |
| 2034 | /* |
| 2035 | * Run handlers that are not paused. |
| 2036 | */ |
| 2037 | if (c->notbefore <= now) |
| 2038 | (*ftab[c->type])(c, readset, writeset); |
| 2039 | else if (unpause_secs != NULL) { |
| 2040 | /* |
| 2041 | * Collect the time that the earliest |
| 2042 | * channel comes off pause. |
| 2043 | */ |
| 2044 | debug3("%s: chan %d: skip for %d more seconds", |
| 2045 | __func__, c->self, |
| 2046 | (int)(c->notbefore - now)); |
| 2047 | if (*unpause_secs == 0 || |
| 2048 | (c->notbefore - now) < *unpause_secs) |
| 2049 | *unpause_secs = c->notbefore - now; |
| 2050 | } |
| 2051 | } |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2052 | channel_garbage_collect(c); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2053 | } |
Damien Miller | a650875 | 2012-04-22 11:21:10 +1000 | [diff] [blame] | 2054 | if (unpause_secs != NULL && *unpause_secs != 0) |
| 2055 | debug3("%s: first channel unpauses in %d seconds", |
| 2056 | __func__, (int)*unpause_secs); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2057 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2058 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2059 | /* |
| 2060 | * Allocate/update select bitmasks and add any bits relevant to channels in |
| 2061 | * select bitmasks. |
| 2062 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2063 | void |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 2064 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
Damien Miller | ba77e1f | 2012-04-23 18:21:05 +1000 | [diff] [blame] | 2065 | u_int *nallocp, time_t *minwait_secs, int rekeying) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2066 | { |
Damien Miller | 3681209 | 2006-03-26 14:22:47 +1100 | [diff] [blame] | 2067 | u_int n, sz, nfdset; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 2068 | |
deraadt@openbsd.org | 9136ec1 | 2016-09-12 01:22:38 +0000 | [diff] [blame] | 2069 | n = MAXIMUM(*maxfdp, channel_max_fd); |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 2070 | |
Damien Miller | 3681209 | 2006-03-26 14:22:47 +1100 | [diff] [blame] | 2071 | nfdset = howmany(n+1, NFDBITS); |
| 2072 | /* Explicitly test here, because xrealloc isn't always called */ |
millert@openbsd.org | fd36834 | 2015-02-06 23:21:59 +0000 | [diff] [blame] | 2073 | if (nfdset && SIZE_MAX / nfdset < sizeof(fd_mask)) |
Damien Miller | 3681209 | 2006-03-26 14:22:47 +1100 | [diff] [blame] | 2074 | fatal("channel_prepare_select: max_fd (%d) is too large", n); |
| 2075 | sz = nfdset * sizeof(fd_mask); |
| 2076 | |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 2077 | /* perhaps check sz < nalloc/2 and shrink? */ |
| 2078 | if (*readsetp == NULL || sz > *nallocp) { |
deraadt@openbsd.org | 657a5fb | 2015-04-24 01:36:00 +0000 | [diff] [blame] | 2079 | *readsetp = xreallocarray(*readsetp, nfdset, sizeof(fd_mask)); |
| 2080 | *writesetp = xreallocarray(*writesetp, nfdset, sizeof(fd_mask)); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 2081 | *nallocp = sz; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 2082 | } |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 2083 | *maxfdp = n; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 2084 | memset(*readsetp, 0, sz); |
| 2085 | memset(*writesetp, 0, sz); |
| 2086 | |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 2087 | if (!rekeying) |
Damien Miller | a650875 | 2012-04-22 11:21:10 +1000 | [diff] [blame] | 2088 | channel_handler(channel_pre, *readsetp, *writesetp, |
| 2089 | minwait_secs); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2090 | } |
| 2091 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2092 | /* |
| 2093 | * After select, perform any appropriate operations for channels which have |
| 2094 | * events pending. |
| 2095 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2096 | void |
Damien Miller | d62f2ca | 2006-03-26 13:57:41 +1100 | [diff] [blame] | 2097 | channel_after_select(fd_set *readset, fd_set *writeset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2098 | { |
Damien Miller | a650875 | 2012-04-22 11:21:10 +1000 | [diff] [blame] | 2099 | channel_handler(channel_post, readset, writeset, NULL); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2100 | } |
| 2101 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2102 | |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 2103 | /* 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] | 2104 | void |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 2105 | channel_output_poll(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2106 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2107 | Channel *c; |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 2108 | u_int i, len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2109 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2110 | for (i = 0; i < channels_alloc; i++) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2111 | c = channels[i]; |
| 2112 | if (c == NULL) |
| 2113 | continue; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2114 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2115 | /* |
| 2116 | * We are only interested in channels that can have buffered |
| 2117 | * incoming data. |
| 2118 | */ |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 2119 | if (c->type != SSH_CHANNEL_OPEN) |
| 2120 | continue; |
| 2121 | if ((c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 2122 | /* XXX is this true? */ |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2123 | debug3("channel %d: will not send data after close", c->self); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2124 | continue; |
| 2125 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2126 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2127 | /* Get the amount of buffered data for this channel. */ |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 2128 | if ((c->istate == CHAN_INPUT_OPEN || |
| 2129 | c->istate == CHAN_INPUT_WAIT_DRAIN) && |
| 2130 | (len = buffer_len(&c->input)) > 0) { |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 2131 | if (c->datagram) { |
| 2132 | if (len > 0) { |
| 2133 | u_char *data; |
| 2134 | u_int dlen; |
| 2135 | |
| 2136 | data = buffer_get_string(&c->input, |
| 2137 | &dlen); |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 2138 | if (dlen > c->remote_window || |
| 2139 | dlen > c->remote_maxpacket) { |
| 2140 | debug("channel %d: datagram " |
| 2141 | "too big for channel", |
| 2142 | c->self); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2143 | free(data); |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 2144 | continue; |
| 2145 | } |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 2146 | packet_start(SSH2_MSG_CHANNEL_DATA); |
| 2147 | packet_put_int(c->remote_id); |
| 2148 | packet_put_string(data, dlen); |
| 2149 | packet_send(); |
djm@openbsd.org | f715afe | 2015-06-30 05:23:25 +0000 | [diff] [blame] | 2150 | c->remote_window -= dlen; |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2151 | free(data); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 2152 | } |
| 2153 | continue; |
| 2154 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2155 | /* |
| 2156 | * Send some data for the other side over the secure |
| 2157 | * connection. |
| 2158 | */ |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 2159 | if (len > c->remote_window) |
| 2160 | len = c->remote_window; |
| 2161 | if (len > c->remote_maxpacket) |
| 2162 | len = c->remote_maxpacket; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2163 | if (len > 0) { |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 2164 | packet_start(SSH2_MSG_CHANNEL_DATA); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2165 | packet_put_int(c->remote_id); |
| 2166 | packet_put_string(buffer_ptr(&c->input), len); |
| 2167 | packet_send(); |
| 2168 | buffer_consume(&c->input, len); |
| 2169 | c->remote_window -= len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2170 | } |
| 2171 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2172 | /* |
| 2173 | * input-buffer is empty and read-socket shutdown: |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 2174 | * tell peer, that we will not send more data: send IEOF. |
| 2175 | * hack for extended data: delay EOF if EFD still in use. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2176 | */ |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 2177 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
Damien Miller | 0dc1bef | 2005-07-17 17:22:45 +1000 | [diff] [blame] | 2178 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
| 2179 | c->self, c->efd, buffer_len(&c->extended)); |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 2180 | else |
| 2181 | chan_ibuf_empty(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2182 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2183 | /* Send extended data, i.e. stderr */ |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 2184 | if (!(c->flags & CHAN_EOF_SENT) && |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2185 | c->remote_window > 0 && |
| 2186 | (len = buffer_len(&c->extended)) > 0 && |
| 2187 | c->extended_usage == CHAN_EXTENDED_READ) { |
Ben Lindstrom | 4fed2be | 2002-06-25 23:17:36 +0000 | [diff] [blame] | 2188 | debug2("channel %d: rwin %u elen %u euse %d", |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 2189 | c->self, c->remote_window, buffer_len(&c->extended), |
| 2190 | c->extended_usage); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2191 | if (len > c->remote_window) |
| 2192 | len = c->remote_window; |
| 2193 | if (len > c->remote_maxpacket) |
| 2194 | len = c->remote_maxpacket; |
| 2195 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); |
| 2196 | packet_put_int(c->remote_id); |
| 2197 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); |
| 2198 | packet_put_string(buffer_ptr(&c->extended), len); |
| 2199 | packet_send(); |
| 2200 | buffer_consume(&c->extended, len); |
| 2201 | c->remote_window -= len; |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 2202 | debug2("channel %d: sent ext data %d", c->self, len); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2203 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2204 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2205 | } |
| 2206 | |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 2207 | /* -- mux proxy support */ |
| 2208 | |
| 2209 | /* |
| 2210 | * When multiplexing channel messages for mux clients we have to deal |
| 2211 | * with downstream messages from the mux client and upstream messages |
| 2212 | * from the ssh server: |
| 2213 | * 1) Handling downstream messages is straightforward and happens |
| 2214 | * in channel_proxy_downstream(): |
| 2215 | * - We forward all messages (mostly) unmodified to the server. |
| 2216 | * - However, in order to route messages from upstream to the correct |
| 2217 | * downstream client, we have to replace the channel IDs used by the |
| 2218 | * mux clients with a unique channel ID because the mux clients might |
| 2219 | * use conflicting channel IDs. |
| 2220 | * - so we inspect and change both SSH2_MSG_CHANNEL_OPEN and |
| 2221 | * SSH2_MSG_CHANNEL_OPEN_CONFIRMATION messages, create a local |
| 2222 | * SSH_CHANNEL_MUX_PROXY channel and replace the mux clients ID |
| 2223 | * with the newly allocated channel ID. |
| 2224 | * 2) Upstream messages are received by matching SSH_CHANNEL_MUX_PROXY |
| 2225 | * channels and procesed by channel_proxy_upstream(). The local channel ID |
| 2226 | * is then translated back to the original mux client ID. |
| 2227 | * 3) In both cases we need to keep track of matching SSH2_MSG_CHANNEL_CLOSE |
| 2228 | * messages so we can clean up SSH_CHANNEL_MUX_PROXY channels. |
| 2229 | * 4) The SSH_CHANNEL_MUX_PROXY channels also need to closed when the |
| 2230 | * downstream mux client are removed. |
| 2231 | * 5) Handling SSH2_MSG_CHANNEL_OPEN messages from the upstream server |
| 2232 | * requires more work, because they are not addressed to a specific |
| 2233 | * channel. E.g. client_request_forwarded_tcpip() needs to figure |
| 2234 | * out whether the request is addressed to the local client or a |
| 2235 | * specific downstream client based on the listen-address/port. |
| 2236 | * 6) Agent and X11-Forwarding have a similar problem and are currenly |
| 2237 | * not supported as the matching session/channel cannot be identified |
| 2238 | * easily. |
| 2239 | */ |
| 2240 | |
| 2241 | /* |
| 2242 | * receive packets from downstream mux clients: |
| 2243 | * channel callback fired on read from mux client, creates |
| 2244 | * SSH_CHANNEL_MUX_PROXY channels and translates channel IDs |
| 2245 | * on channel creation. |
| 2246 | */ |
| 2247 | int |
| 2248 | channel_proxy_downstream(Channel *downstream) |
| 2249 | { |
| 2250 | Channel *c = NULL; |
| 2251 | struct ssh *ssh = active_state; |
| 2252 | struct sshbuf *original = NULL, *modified = NULL; |
| 2253 | const u_char *cp; |
| 2254 | char *ctype = NULL, *listen_host = NULL; |
| 2255 | u_char type; |
| 2256 | size_t have; |
djm@openbsd.org | 2f78a2a | 2016-09-30 20:24:46 +0000 | [diff] [blame] | 2257 | int ret = -1, r, idx; |
| 2258 | u_int id, remote_id, listen_port; |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 2259 | |
| 2260 | /* sshbuf_dump(&downstream->input, stderr); */ |
| 2261 | if ((r = sshbuf_get_string_direct(&downstream->input, &cp, &have)) |
| 2262 | != 0) { |
| 2263 | error("%s: malformed message: %s", __func__, ssh_err(r)); |
| 2264 | return -1; |
| 2265 | } |
| 2266 | if (have < 2) { |
| 2267 | error("%s: short message", __func__); |
| 2268 | return -1; |
| 2269 | } |
| 2270 | type = cp[1]; |
| 2271 | /* skip padlen + type */ |
| 2272 | cp += 2; |
| 2273 | have -= 2; |
| 2274 | if (ssh_packet_log_type(type)) |
| 2275 | debug3("%s: channel %u: down->up: type %u", __func__, |
| 2276 | downstream->self, type); |
| 2277 | |
| 2278 | switch (type) { |
| 2279 | case SSH2_MSG_CHANNEL_OPEN: |
| 2280 | if ((original = sshbuf_from(cp, have)) == NULL || |
| 2281 | (modified = sshbuf_new()) == NULL) { |
| 2282 | error("%s: alloc", __func__); |
| 2283 | goto out; |
| 2284 | } |
| 2285 | if ((r = sshbuf_get_cstring(original, &ctype, NULL)) != 0 || |
| 2286 | (r = sshbuf_get_u32(original, &id)) != 0) { |
| 2287 | error("%s: parse error %s", __func__, ssh_err(r)); |
| 2288 | goto out; |
| 2289 | } |
| 2290 | c = channel_new("mux proxy", SSH_CHANNEL_MUX_PROXY, |
| 2291 | -1, -1, -1, 0, 0, 0, ctype, 1); |
| 2292 | c->mux_ctx = downstream; /* point to mux client */ |
| 2293 | c->mux_downstream_id = id; /* original downstream id */ |
| 2294 | if ((r = sshbuf_put_cstring(modified, ctype)) != 0 || |
| 2295 | (r = sshbuf_put_u32(modified, c->self)) != 0 || |
| 2296 | (r = sshbuf_putb(modified, original)) != 0) { |
| 2297 | error("%s: compose error %s", __func__, ssh_err(r)); |
| 2298 | channel_free(c); |
| 2299 | goto out; |
| 2300 | } |
| 2301 | break; |
| 2302 | case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION: |
| 2303 | /* |
| 2304 | * Almost the same as SSH2_MSG_CHANNEL_OPEN, except then we |
| 2305 | * need to parse 'remote_id' instead of 'ctype'. |
| 2306 | */ |
| 2307 | if ((original = sshbuf_from(cp, have)) == NULL || |
| 2308 | (modified = sshbuf_new()) == NULL) { |
| 2309 | error("%s: alloc", __func__); |
| 2310 | goto out; |
| 2311 | } |
| 2312 | if ((r = sshbuf_get_u32(original, &remote_id)) != 0 || |
| 2313 | (r = sshbuf_get_u32(original, &id)) != 0) { |
| 2314 | error("%s: parse error %s", __func__, ssh_err(r)); |
| 2315 | goto out; |
| 2316 | } |
| 2317 | c = channel_new("mux proxy", SSH_CHANNEL_MUX_PROXY, |
| 2318 | -1, -1, -1, 0, 0, 0, "mux-down-connect", 1); |
| 2319 | c->mux_ctx = downstream; /* point to mux client */ |
| 2320 | c->mux_downstream_id = id; |
| 2321 | c->remote_id = remote_id; |
| 2322 | if ((r = sshbuf_put_u32(modified, remote_id)) != 0 || |
| 2323 | (r = sshbuf_put_u32(modified, c->self)) != 0 || |
| 2324 | (r = sshbuf_putb(modified, original)) != 0) { |
| 2325 | error("%s: compose error %s", __func__, ssh_err(r)); |
| 2326 | channel_free(c); |
| 2327 | goto out; |
| 2328 | } |
| 2329 | break; |
| 2330 | case SSH2_MSG_GLOBAL_REQUEST: |
| 2331 | if ((original = sshbuf_from(cp, have)) == NULL) { |
| 2332 | error("%s: alloc", __func__); |
| 2333 | goto out; |
| 2334 | } |
| 2335 | if ((r = sshbuf_get_cstring(original, &ctype, NULL)) != 0) { |
| 2336 | error("%s: parse error %s", __func__, ssh_err(r)); |
| 2337 | goto out; |
| 2338 | } |
| 2339 | if (strcmp(ctype, "tcpip-forward") != 0) { |
| 2340 | error("%s: unsupported request %s", __func__, ctype); |
| 2341 | goto out; |
| 2342 | } |
| 2343 | if ((r = sshbuf_get_u8(original, NULL)) != 0 || |
| 2344 | (r = sshbuf_get_cstring(original, &listen_host, NULL)) != 0 || |
| 2345 | (r = sshbuf_get_u32(original, &listen_port)) != 0) { |
| 2346 | error("%s: parse error %s", __func__, ssh_err(r)); |
| 2347 | goto out; |
| 2348 | } |
djm@openbsd.org | 2f78a2a | 2016-09-30 20:24:46 +0000 | [diff] [blame] | 2349 | if (listen_port > 65535) { |
| 2350 | error("%s: tcpip-forward for %s: bad port %u", |
| 2351 | __func__, listen_host, listen_port); |
| 2352 | goto out; |
| 2353 | } |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 2354 | /* Record that connection to this host/port is permitted. */ |
| 2355 | permitted_opens = xreallocarray(permitted_opens, |
| 2356 | num_permitted_opens + 1, sizeof(*permitted_opens)); |
| 2357 | idx = num_permitted_opens++; |
| 2358 | permitted_opens[idx].host_to_connect = xstrdup("<mux>"); |
| 2359 | permitted_opens[idx].port_to_connect = -1; |
| 2360 | permitted_opens[idx].listen_host = listen_host; |
djm@openbsd.org | 2f78a2a | 2016-09-30 20:24:46 +0000 | [diff] [blame] | 2361 | permitted_opens[idx].listen_port = (int)listen_port; |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 2362 | permitted_opens[idx].downstream = downstream; |
| 2363 | listen_host = NULL; |
| 2364 | break; |
| 2365 | case SSH2_MSG_CHANNEL_CLOSE: |
| 2366 | if (have < 4) |
| 2367 | break; |
| 2368 | remote_id = PEEK_U32(cp); |
| 2369 | if ((c = channel_by_remote_id(remote_id)) != NULL) { |
| 2370 | if (c->flags & CHAN_CLOSE_RCVD) |
| 2371 | channel_free(c); |
| 2372 | else |
| 2373 | c->flags |= CHAN_CLOSE_SENT; |
| 2374 | } |
| 2375 | break; |
| 2376 | } |
| 2377 | if (modified) { |
| 2378 | if ((r = sshpkt_start(ssh, type)) != 0 || |
| 2379 | (r = sshpkt_putb(ssh, modified)) != 0 || |
| 2380 | (r = sshpkt_send(ssh)) != 0) { |
| 2381 | error("%s: send %s", __func__, ssh_err(r)); |
| 2382 | goto out; |
| 2383 | } |
| 2384 | } else { |
| 2385 | if ((r = sshpkt_start(ssh, type)) != 0 || |
| 2386 | (r = sshpkt_put(ssh, cp, have)) != 0 || |
| 2387 | (r = sshpkt_send(ssh)) != 0) { |
| 2388 | error("%s: send %s", __func__, ssh_err(r)); |
| 2389 | goto out; |
| 2390 | } |
| 2391 | } |
| 2392 | ret = 0; |
| 2393 | out: |
| 2394 | free(ctype); |
| 2395 | free(listen_host); |
| 2396 | sshbuf_free(original); |
| 2397 | sshbuf_free(modified); |
| 2398 | return ret; |
| 2399 | } |
| 2400 | |
| 2401 | /* |
| 2402 | * receive packets from upstream server and de-multiplex packets |
| 2403 | * to correct downstream: |
| 2404 | * implemented as a helper for channel input handlers, |
| 2405 | * replaces local (proxy) channel ID with downstream channel ID. |
| 2406 | */ |
| 2407 | int |
| 2408 | channel_proxy_upstream(Channel *c, int type, u_int32_t seq, void *ctxt) |
| 2409 | { |
| 2410 | struct ssh *ssh = active_state; |
| 2411 | struct sshbuf *b = NULL; |
| 2412 | Channel *downstream; |
| 2413 | const u_char *cp = NULL; |
| 2414 | size_t len; |
| 2415 | int r; |
| 2416 | |
| 2417 | /* |
| 2418 | * When receiving packets from the peer we need to check whether we |
| 2419 | * need to forward the packets to the mux client. In this case we |
| 2420 | * restore the orignal channel id and keep track of CLOSE messages, |
| 2421 | * so we can cleanup the channel. |
| 2422 | */ |
| 2423 | if (c == NULL || c->type != SSH_CHANNEL_MUX_PROXY) |
| 2424 | return 0; |
| 2425 | if ((downstream = c->mux_ctx) == NULL) |
| 2426 | return 0; |
| 2427 | switch (type) { |
| 2428 | case SSH2_MSG_CHANNEL_CLOSE: |
| 2429 | case SSH2_MSG_CHANNEL_DATA: |
| 2430 | case SSH2_MSG_CHANNEL_EOF: |
| 2431 | case SSH2_MSG_CHANNEL_EXTENDED_DATA: |
| 2432 | case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION: |
| 2433 | case SSH2_MSG_CHANNEL_OPEN_FAILURE: |
| 2434 | case SSH2_MSG_CHANNEL_WINDOW_ADJUST: |
| 2435 | case SSH2_MSG_CHANNEL_SUCCESS: |
| 2436 | case SSH2_MSG_CHANNEL_FAILURE: |
| 2437 | case SSH2_MSG_CHANNEL_REQUEST: |
| 2438 | break; |
| 2439 | default: |
| 2440 | debug2("%s: channel %u: unsupported type %u", __func__, |
| 2441 | c->self, type); |
| 2442 | return 0; |
| 2443 | } |
| 2444 | if ((b = sshbuf_new()) == NULL) { |
| 2445 | error("%s: alloc reply", __func__); |
| 2446 | goto out; |
| 2447 | } |
| 2448 | /* get remaining payload (after id) */ |
| 2449 | cp = sshpkt_ptr(ssh, &len); |
| 2450 | if (cp == NULL) { |
| 2451 | error("%s: no packet", __func__); |
| 2452 | goto out; |
| 2453 | } |
| 2454 | /* translate id and send to muxclient */ |
| 2455 | if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */ |
| 2456 | (r = sshbuf_put_u8(b, type)) != 0 || |
| 2457 | (r = sshbuf_put_u32(b, c->mux_downstream_id)) != 0 || |
| 2458 | (r = sshbuf_put(b, cp, len)) != 0 || |
| 2459 | (r = sshbuf_put_stringb(&downstream->output, b)) != 0) { |
| 2460 | error("%s: compose for muxclient %s", __func__, ssh_err(r)); |
| 2461 | goto out; |
| 2462 | } |
| 2463 | /* sshbuf_dump(b, stderr); */ |
| 2464 | if (ssh_packet_log_type(type)) |
| 2465 | debug3("%s: channel %u: up->down: type %u", __func__, c->self, |
| 2466 | type); |
| 2467 | out: |
| 2468 | /* update state */ |
| 2469 | switch (type) { |
| 2470 | case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION: |
| 2471 | /* record remote_id for SSH2_MSG_CHANNEL_CLOSE */ |
| 2472 | if (cp && len > 4) |
| 2473 | c->remote_id = PEEK_U32(cp); |
| 2474 | break; |
| 2475 | case SSH2_MSG_CHANNEL_CLOSE: |
| 2476 | if (c->flags & CHAN_CLOSE_SENT) |
| 2477 | channel_free(c); |
| 2478 | else |
| 2479 | c->flags |= CHAN_CLOSE_RCVD; |
| 2480 | break; |
| 2481 | } |
| 2482 | sshbuf_free(b); |
| 2483 | return 1; |
| 2484 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2485 | |
| 2486 | /* -- protocol input */ |
Damien Miller | d79b424 | 2006-03-31 23:11:44 +1100 | [diff] [blame] | 2487 | |
| 2488 | /* ARGSUSED */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2489 | int |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2490 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2491 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2492 | int id; |
Damien Miller | 633de33 | 2014-05-15 13:48:26 +1000 | [diff] [blame] | 2493 | const u_char *data; |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 2494 | u_int data_len, win_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2495 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2496 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2497 | /* Get the channel number and verify it. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2498 | id = packet_get_int(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2499 | c = channel_lookup(id); |
| 2500 | if (c == NULL) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2501 | packet_disconnect("Received data for nonexistent channel %d.", id); |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 2502 | if (channel_proxy_upstream(c, type, seq, ctxt)) |
| 2503 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2504 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2505 | /* Ignore any data for non-open channels (might happen on close) */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2506 | if (c->type != SSH_CHANNEL_OPEN && |
| 2507 | c->type != SSH_CHANNEL_X11_OPEN) |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2508 | return 0; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2509 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2510 | /* Get the data. */ |
Damien Miller | db255ca | 2008-05-19 14:59:37 +1000 | [diff] [blame] | 2511 | data = packet_get_string_ptr(&data_len); |
Damien Miller | 7d45718 | 2010-08-05 23:09:48 +1000 | [diff] [blame] | 2512 | win_len = data_len; |
| 2513 | if (c->datagram) |
| 2514 | win_len += 4; /* string length header */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2515 | |
Damien Miller | a04ad49 | 2004-01-21 11:02:09 +1100 | [diff] [blame] | 2516 | /* |
| 2517 | * Ignore data for protocol > 1.3 if output end is no longer open. |
| 2518 | * For protocol 2 the sending side is reducing its window as it sends |
| 2519 | * data, so we must 'fake' consumption of the data in order to ensure |
| 2520 | * that window updates are sent back. Otherwise the connection might |
| 2521 | * deadlock. |
| 2522 | */ |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 2523 | if (c->ostate != CHAN_OUTPUT_OPEN) { |
| 2524 | c->local_window -= win_len; |
| 2525 | c->local_consumed += win_len; |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2526 | return 0; |
Damien Miller | a04ad49 | 2004-01-21 11:02:09 +1100 | [diff] [blame] | 2527 | } |
| 2528 | |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 2529 | if (win_len > c->local_maxpacket) { |
| 2530 | logit("channel %d: rcvd big packet %d, maxpack %d", |
| 2531 | c->self, win_len, c->local_maxpacket); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2532 | } |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 2533 | if (win_len > c->local_window) { |
| 2534 | logit("channel %d: rcvd too much data %d, win %d", |
| 2535 | c->self, win_len, c->local_window); |
| 2536 | return 0; |
| 2537 | } |
| 2538 | c->local_window -= win_len; |
| 2539 | |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 2540 | if (c->datagram) |
| 2541 | buffer_put_string(&c->output, data, data_len); |
| 2542 | else |
| 2543 | buffer_append(&c->output, data, data_len); |
Damien Miller | db255ca | 2008-05-19 14:59:37 +1000 | [diff] [blame] | 2544 | packet_check_eom(); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2545 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2546 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2547 | |
Damien Miller | d79b424 | 2006-03-31 23:11:44 +1100 | [diff] [blame] | 2548 | /* ARGSUSED */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2549 | int |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2550 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2551 | { |
| 2552 | int id; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2553 | char *data; |
Ben Lindstrom | daa2179 | 2002-06-25 23:15:30 +0000 | [diff] [blame] | 2554 | u_int data_len, tcode; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2555 | Channel *c; |
| 2556 | |
| 2557 | /* Get the channel number and verify it. */ |
| 2558 | id = packet_get_int(); |
| 2559 | c = channel_lookup(id); |
| 2560 | |
| 2561 | if (c == NULL) |
| 2562 | packet_disconnect("Received extended_data for bad channel %d.", id); |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 2563 | if (channel_proxy_upstream(c, type, seq, ctxt)) |
| 2564 | return 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2565 | if (c->type != SSH_CHANNEL_OPEN) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 2566 | logit("channel %d: ext data for non open", id); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2567 | return 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2568 | } |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 2569 | if (c->flags & CHAN_EOF_RCVD) { |
| 2570 | if (datafellows & SSH_BUG_EXTEOF) |
| 2571 | debug("channel %d: accepting ext data after eof", id); |
| 2572 | else |
| 2573 | packet_disconnect("Received extended_data after EOF " |
| 2574 | "on channel %d.", id); |
| 2575 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2576 | tcode = packet_get_int(); |
| 2577 | if (c->efd == -1 || |
| 2578 | c->extended_usage != CHAN_EXTENDED_WRITE || |
| 2579 | tcode != SSH2_EXTENDED_DATA_STDERR) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 2580 | logit("channel %d: bad ext data", c->self); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2581 | return 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2582 | } |
| 2583 | data = packet_get_string(&data_len); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2584 | packet_check_eom(); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2585 | if (data_len > c->local_window) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 2586 | logit("channel %d: rcvd too much extended_data %d, win %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2587 | c->self, data_len, c->local_window); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2588 | free(data); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2589 | return 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2590 | } |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 2591 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2592 | c->local_window -= data_len; |
| 2593 | buffer_append(&c->extended, data, data_len); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2594 | free(data); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2595 | return 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2596 | } |
| 2597 | |
Damien Miller | d79b424 | 2006-03-31 23:11:44 +1100 | [diff] [blame] | 2598 | /* ARGSUSED */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2599 | int |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2600 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2601 | { |
| 2602 | int id; |
| 2603 | Channel *c; |
| 2604 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2605 | id = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2606 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2607 | c = channel_lookup(id); |
| 2608 | if (c == NULL) |
| 2609 | packet_disconnect("Received ieof for nonexistent channel %d.", id); |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 2610 | if (channel_proxy_upstream(c, type, seq, ctxt)) |
| 2611 | return 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2612 | chan_rcvd_ieof(c); |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 2613 | |
| 2614 | /* XXX force input close */ |
Damien Miller | a90fc08 | 2002-01-22 23:19:38 +1100 | [diff] [blame] | 2615 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 2616 | debug("channel %d: FORCE input drain", c->self); |
| 2617 | c->istate = CHAN_INPUT_WAIT_DRAIN; |
Damien Miller | 73f1074 | 2002-01-22 23:34:52 +1100 | [diff] [blame] | 2618 | if (buffer_len(&c->input) == 0) |
| 2619 | chan_ibuf_empty(c); |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 2620 | } |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2621 | return 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2622 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2623 | |
Damien Miller | d79b424 | 2006-03-31 23:11:44 +1100 | [diff] [blame] | 2624 | /* ARGSUSED */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2625 | int |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2626 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2627 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2628 | int id; |
| 2629 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2630 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2631 | id = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2632 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2633 | c = channel_lookup(id); |
| 2634 | if (c == NULL) |
| 2635 | packet_disconnect("Received close for nonexistent channel %d.", id); |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 2636 | if (channel_proxy_upstream(c, type, seq, ctxt)) |
| 2637 | return 0; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2638 | /* |
| 2639 | * Send a confirmation that we have closed the channel and no more |
| 2640 | * data is coming for it. |
| 2641 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2642 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2643 | packet_put_int(c->remote_id); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2644 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2645 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2646 | /* |
| 2647 | * If the channel is in closed state, we have sent a close request, |
| 2648 | * and the other side will eventually respond with a confirmation. |
| 2649 | * Thus, we cannot free the channel here, because then there would be |
| 2650 | * no-one to receive the confirmation. The channel gets freed when |
| 2651 | * the confirmation arrives. |
| 2652 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2653 | if (c->type != SSH_CHANNEL_CLOSED) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2654 | /* |
| 2655 | * Not a closed channel - mark it as draining, which will |
| 2656 | * cause it to be freed later. |
| 2657 | */ |
Damien Miller | 76765c0 | 2002-01-22 23:21:15 +1100 | [diff] [blame] | 2658 | buffer_clear(&c->input); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2659 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2660 | } |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2661 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2662 | } |
| 2663 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2664 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
Damien Miller | d79b424 | 2006-03-31 23:11:44 +1100 | [diff] [blame] | 2665 | /* ARGSUSED */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2666 | int |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2667 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2668 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2669 | int id = packet_get_int(); |
| 2670 | Channel *c = channel_lookup(id); |
Damien Miller | 66823cd | 2002-01-22 23:11:38 +1100 | [diff] [blame] | 2671 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2672 | if (c == NULL) |
| 2673 | packet_disconnect("Received oclose for nonexistent channel %d.", id); |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 2674 | if (channel_proxy_upstream(c, type, seq, ctxt)) |
| 2675 | return 0; |
| 2676 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2677 | chan_rcvd_oclose(c); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2678 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2679 | } |
| 2680 | |
Damien Miller | d79b424 | 2006-03-31 23:11:44 +1100 | [diff] [blame] | 2681 | /* ARGSUSED */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2682 | int |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2683 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2684 | { |
| 2685 | int id = packet_get_int(); |
| 2686 | Channel *c = channel_lookup(id); |
| 2687 | |
| 2688 | if (c == NULL) |
| 2689 | packet_disconnect("Received close confirmation for " |
| 2690 | "out-of-range channel %d.", id); |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 2691 | if (channel_proxy_upstream(c, type, seq, ctxt)) |
| 2692 | return 0; |
| 2693 | packet_check_eom(); |
Damien Miller | 3618709 | 2013-06-10 13:07:11 +1000 | [diff] [blame] | 2694 | if (c->type != SSH_CHANNEL_CLOSED && c->type != SSH_CHANNEL_ABANDONED) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2695 | packet_disconnect("Received close confirmation for " |
| 2696 | "non-closed channel %d (type %d).", id, c->type); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2697 | channel_free(c); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2698 | return 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2699 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2700 | |
Damien Miller | d79b424 | 2006-03-31 23:11:44 +1100 | [diff] [blame] | 2701 | /* ARGSUSED */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2702 | int |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2703 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2704 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2705 | int id, remote_id; |
| 2706 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2707 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2708 | id = packet_get_int(); |
| 2709 | c = channel_lookup(id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2710 | |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 2711 | if (c==NULL) |
| 2712 | packet_disconnect("Received open confirmation for " |
| 2713 | "unknown channel %d.", id); |
| 2714 | if (channel_proxy_upstream(c, type, seq, ctxt)) |
| 2715 | return 0; |
| 2716 | if (c->type != SSH_CHANNEL_OPENING) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2717 | packet_disconnect("Received open confirmation for " |
| 2718 | "non-opening channel %d.", id); |
| 2719 | remote_id = packet_get_int(); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2720 | /* 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] | 2721 | c->remote_id = remote_id; |
| 2722 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2723 | |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 2724 | c->remote_window = packet_get_int(); |
| 2725 | c->remote_maxpacket = packet_get_int(); |
| 2726 | if (c->open_confirm) { |
| 2727 | debug2("callback start"); |
| 2728 | c->open_confirm(c->self, 1, c->open_confirm_ctx); |
| 2729 | debug2("callback done"); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2730 | } |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 2731 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
| 2732 | c->remote_window, c->remote_maxpacket); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2733 | packet_check_eom(); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2734 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2735 | } |
| 2736 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2737 | static char * |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 2738 | reason2txt(int reason) |
| 2739 | { |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 2740 | switch (reason) { |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 2741 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
| 2742 | return "administratively prohibited"; |
| 2743 | case SSH2_OPEN_CONNECT_FAILED: |
| 2744 | return "connect failed"; |
| 2745 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: |
| 2746 | return "unknown channel type"; |
| 2747 | case SSH2_OPEN_RESOURCE_SHORTAGE: |
| 2748 | return "resource shortage"; |
| 2749 | } |
Ben Lindstrom | e259544 | 2001-06-05 20:01:39 +0000 | [diff] [blame] | 2750 | return "unknown reason"; |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 2751 | } |
| 2752 | |
Damien Miller | d79b424 | 2006-03-31 23:11:44 +1100 | [diff] [blame] | 2753 | /* ARGSUSED */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2754 | int |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2755 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2756 | { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2757 | int id, reason; |
| 2758 | char *msg = NULL, *lang = NULL; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2759 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2760 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2761 | id = packet_get_int(); |
| 2762 | c = channel_lookup(id); |
| 2763 | |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 2764 | if (c==NULL) |
| 2765 | packet_disconnect("Received open failure for " |
| 2766 | "unknown channel %d.", id); |
| 2767 | if (channel_proxy_upstream(c, type, seq, ctxt)) |
| 2768 | return 0; |
| 2769 | if (c->type != SSH_CHANNEL_OPENING) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2770 | packet_disconnect("Received open failure for " |
| 2771 | "non-opening channel %d.", id); |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 2772 | reason = packet_get_int(); |
| 2773 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
| 2774 | msg = packet_get_string(NULL); |
| 2775 | lang = packet_get_string(NULL); |
| 2776 | } |
| 2777 | logit("channel %d: open failed: %s%s%s", id, |
| 2778 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
| 2779 | free(msg); |
| 2780 | free(lang); |
| 2781 | if (c->open_confirm) { |
| 2782 | debug2("callback start"); |
| 2783 | c->open_confirm(c->self, 0, c->open_confirm_ctx); |
| 2784 | debug2("callback done"); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2785 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2786 | packet_check_eom(); |
Damien Miller | 7a60621 | 2009-01-28 16:22:34 +1100 | [diff] [blame] | 2787 | /* Schedule the channel for cleanup/deletion. */ |
| 2788 | chan_mark_dead(c); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2789 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2790 | } |
| 2791 | |
Damien Miller | d79b424 | 2006-03-31 23:11:44 +1100 | [diff] [blame] | 2792 | /* ARGSUSED */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2793 | int |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2794 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2795 | { |
| 2796 | Channel *c; |
Ben Lindstrom | 4fed2be | 2002-06-25 23:17:36 +0000 | [diff] [blame] | 2797 | int id; |
djm@openbsd.org | 629df77 | 2015-06-30 05:25:07 +0000 | [diff] [blame] | 2798 | u_int adjust, tmp; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2799 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2800 | /* Get the channel number and verify it. */ |
| 2801 | id = packet_get_int(); |
| 2802 | c = channel_lookup(id); |
| 2803 | |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 2804 | if (c == NULL) { |
| 2805 | logit("Received window adjust for non-open channel %d.", id); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2806 | return 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2807 | } |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 2808 | if (channel_proxy_upstream(c, type, seq, ctxt)) |
| 2809 | return 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2810 | adjust = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2811 | packet_check_eom(); |
Ben Lindstrom | 4fed2be | 2002-06-25 23:17:36 +0000 | [diff] [blame] | 2812 | debug2("channel %d: rcvd adjust %u", id, adjust); |
djm@openbsd.org | 629df77 | 2015-06-30 05:25:07 +0000 | [diff] [blame] | 2813 | if ((tmp = c->remote_window + adjust) < c->remote_window) |
| 2814 | fatal("channel %d: adjust %u overflows remote window %u", |
| 2815 | id, adjust, c->remote_window); |
| 2816 | c->remote_window = tmp; |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2817 | return 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2818 | } |
| 2819 | |
Damien Miller | d79b424 | 2006-03-31 23:11:44 +1100 | [diff] [blame] | 2820 | /* ARGSUSED */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2821 | int |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2822 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2823 | { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2824 | Channel *c = NULL; |
| 2825 | u_short host_port; |
| 2826 | char *host, *originator_string; |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 2827 | int remote_id; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2828 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2829 | remote_id = packet_get_int(); |
| 2830 | host = packet_get_string(NULL); |
| 2831 | host_port = packet_get_int(); |
| 2832 | |
| 2833 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { |
| 2834 | originator_string = packet_get_string(NULL); |
| 2835 | } else { |
| 2836 | originator_string = xstrdup("unknown (remote did not supply name)"); |
| 2837 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2838 | packet_check_eom(); |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 2839 | c = channel_connect_to_port(host, host_port, |
dtucker@openbsd.org | 858252f | 2017-02-01 02:59:09 +0000 | [diff] [blame] | 2840 | "connected socket", originator_string, NULL, NULL); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2841 | free(originator_string); |
| 2842 | free(host); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2843 | if (c == NULL) { |
| 2844 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 2845 | packet_put_int(remote_id); |
| 2846 | packet_send(); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 2847 | } else |
| 2848 | c->remote_id = remote_id; |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2849 | return 0; |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 2850 | } |
| 2851 | |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 2852 | /* ARGSUSED */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2853 | int |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 2854 | channel_input_status_confirm(int type, u_int32_t seq, void *ctxt) |
| 2855 | { |
| 2856 | Channel *c; |
| 2857 | struct channel_confirm *cc; |
Damien Miller | 16a7307 | 2008-12-08 09:55:25 +1100 | [diff] [blame] | 2858 | int id; |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 2859 | |
| 2860 | /* Reset keepalive timeout */ |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2861 | packet_set_alive_timeouts(0); |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 2862 | |
Damien Miller | 16a7307 | 2008-12-08 09:55:25 +1100 | [diff] [blame] | 2863 | id = packet_get_int(); |
Damien Miller | 16a7307 | 2008-12-08 09:55:25 +1100 | [diff] [blame] | 2864 | debug2("channel_input_status_confirm: type %d id %d", type, id); |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 2865 | |
Damien Miller | 16a7307 | 2008-12-08 09:55:25 +1100 | [diff] [blame] | 2866 | if ((c = channel_lookup(id)) == NULL) { |
| 2867 | logit("channel_input_status_confirm: %d: unknown", id); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2868 | return 0; |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 2869 | } |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 2870 | if (channel_proxy_upstream(c, type, seq, ctxt)) |
| 2871 | return 0; |
| 2872 | packet_check_eom(); |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 2873 | if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL) |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2874 | return 0; |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 2875 | cc->cb(type, c, cc->ctx); |
| 2876 | TAILQ_REMOVE(&c->status_confirms, cc, entry); |
Damien Miller | 1d2c456 | 2014-02-04 11:18:20 +1100 | [diff] [blame] | 2877 | explicit_bzero(cc, sizeof(*cc)); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2878 | free(cc); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 2879 | return 0; |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 2880 | } |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 2881 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2882 | /* -- tcp forwarding */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2883 | |
Ben Lindstrom | 908afed | 2001-10-03 17:34:59 +0000 | [diff] [blame] | 2884 | void |
| 2885 | channel_set_af(int af) |
| 2886 | { |
| 2887 | IPv4or6 = af; |
| 2888 | } |
| 2889 | |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2890 | |
| 2891 | /* |
| 2892 | * Determine whether or not a port forward listens to loopback, the |
| 2893 | * specified address or wildcard. On the client, a specified bind |
| 2894 | * address will always override gateway_ports. On the server, a |
| 2895 | * gateway_ports of 1 (``yes'') will override the client's specification |
| 2896 | * and force a wildcard bind, whereas a value of 2 (``clientspecified'') |
| 2897 | * will bind to whatever address the client asked for. |
| 2898 | * |
| 2899 | * Special-case listen_addrs are: |
| 2900 | * |
| 2901 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR |
| 2902 | * "" (empty string), "*" -> wildcard v4/v6 |
| 2903 | * "localhost" -> loopback v4/v6 |
Damien Miller | 602943d | 2014-07-04 08:59:41 +1000 | [diff] [blame] | 2904 | * "127.0.0.1" / "::1" -> accepted even if gateway_ports isn't set |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2905 | */ |
| 2906 | static const char * |
| 2907 | channel_fwd_bind_addr(const char *listen_addr, int *wildcardp, |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 2908 | int is_client, struct ForwardOptions *fwd_opts) |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2909 | { |
| 2910 | const char *addr = NULL; |
| 2911 | int wildcard = 0; |
| 2912 | |
| 2913 | if (listen_addr == NULL) { |
| 2914 | /* No address specified: default to gateway_ports setting */ |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 2915 | if (fwd_opts->gateway_ports) |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2916 | wildcard = 1; |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 2917 | } else if (fwd_opts->gateway_ports || is_client) { |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2918 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && |
| 2919 | strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) || |
| 2920 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 2921 | (!is_client && fwd_opts->gateway_ports == 1)) { |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2922 | wildcard = 1; |
Darren Tucker | 71152bc | 2013-10-10 10:27:21 +1100 | [diff] [blame] | 2923 | /* |
| 2924 | * Notify client if they requested a specific listen |
| 2925 | * address and it was overridden. |
| 2926 | */ |
| 2927 | if (*listen_addr != '\0' && |
| 2928 | strcmp(listen_addr, "0.0.0.0") != 0 && |
| 2929 | strcmp(listen_addr, "*") != 0) { |
| 2930 | packet_send_debug("Forwarding listen address " |
| 2931 | "\"%s\" overridden by server " |
| 2932 | "GatewayPorts", listen_addr); |
| 2933 | } |
Damien Miller | 602943d | 2014-07-04 08:59:41 +1000 | [diff] [blame] | 2934 | } else if (strcmp(listen_addr, "localhost") != 0 || |
| 2935 | strcmp(listen_addr, "127.0.0.1") == 0 || |
| 2936 | strcmp(listen_addr, "::1") == 0) { |
| 2937 | /* Accept localhost address when GatewayPorts=yes */ |
Damien Miller | e84d103 | 2014-05-21 17:13:36 +1000 | [diff] [blame] | 2938 | addr = listen_addr; |
Damien Miller | 602943d | 2014-07-04 08:59:41 +1000 | [diff] [blame] | 2939 | } |
| 2940 | } else if (strcmp(listen_addr, "127.0.0.1") == 0 || |
| 2941 | strcmp(listen_addr, "::1") == 0) { |
| 2942 | /* |
| 2943 | * If a specific IPv4/IPv6 localhost address has been |
| 2944 | * requested then accept it even if gateway_ports is in |
| 2945 | * effect. This allows the client to prefer IPv4 or IPv6. |
| 2946 | */ |
| 2947 | addr = listen_addr; |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2948 | } |
| 2949 | if (wildcardp != NULL) |
| 2950 | *wildcardp = wildcard; |
| 2951 | return addr; |
| 2952 | } |
| 2953 | |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2954 | static int |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 2955 | channel_setup_fwd_listener_tcpip(int type, struct Forward *fwd, |
| 2956 | int *allocated_listen_port, struct ForwardOptions *fwd_opts) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2957 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2958 | Channel *c; |
Damien Miller | 5e7fd07 | 2005-11-05 14:53:39 +1100 | [diff] [blame] | 2959 | int sock, r, success = 0, wildcard = 0, is_client; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2960 | struct addrinfo hints, *ai, *aitop; |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2961 | const char *host, *addr; |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2962 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 2963 | in_port_t *lport_p; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2964 | |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2965 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2966 | |
millert@openbsd.org | ec04dc4 | 2015-06-05 15:13:13 +0000 | [diff] [blame] | 2967 | if (is_client && fwd->connect_path != NULL) { |
| 2968 | host = fwd->connect_path; |
| 2969 | } else { |
| 2970 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
| 2971 | fwd->listen_host : fwd->connect_host; |
| 2972 | if (host == NULL) { |
| 2973 | error("No forward host name."); |
| 2974 | return 0; |
| 2975 | } |
| 2976 | if (strlen(host) >= NI_MAXHOST) { |
| 2977 | error("Forward host name too long."); |
| 2978 | return 0; |
| 2979 | } |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2980 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2981 | |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 2982 | /* Determine the bind address, cf. channel_fwd_bind_addr() comment */ |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 2983 | addr = channel_fwd_bind_addr(fwd->listen_host, &wildcard, |
| 2984 | is_client, fwd_opts); |
| 2985 | debug3("%s: type %d wildcard %d addr %s", __func__, |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2986 | type, wildcard, (addr == NULL) ? "NULL" : addr); |
| 2987 | |
| 2988 | /* |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2989 | * getaddrinfo returns a loopback address if the hostname is |
| 2990 | * set to NULL and hints.ai_flags is not AI_PASSIVE |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2991 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2992 | memset(&hints, 0, sizeof(hints)); |
| 2993 | hints.ai_family = IPv4or6; |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2994 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2995 | hints.ai_socktype = SOCK_STREAM; |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 2996 | snprintf(strport, sizeof strport, "%d", fwd->listen_port); |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2997 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
| 2998 | if (addr == NULL) { |
| 2999 | /* This really shouldn't happen */ |
| 3000 | packet_disconnect("getaddrinfo: fatal error: %s", |
Darren Tucker | 4abde77 | 2007-12-29 02:43:51 +1100 | [diff] [blame] | 3001 | ssh_gai_strerror(r)); |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 3002 | } else { |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3003 | error("%s: getaddrinfo(%.64s): %s", __func__, addr, |
Darren Tucker | 4abde77 | 2007-12-29 02:43:51 +1100 | [diff] [blame] | 3004 | ssh_gai_strerror(r)); |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 3005 | } |
Damien Miller | a727030 | 2005-07-06 09:36:05 +1000 | [diff] [blame] | 3006 | return 0; |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 3007 | } |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 3008 | if (allocated_listen_port != NULL) |
| 3009 | *allocated_listen_port = 0; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3010 | for (ai = aitop; ai; ai = ai->ai_next) { |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 3011 | switch (ai->ai_family) { |
| 3012 | case AF_INET: |
| 3013 | lport_p = &((struct sockaddr_in *)ai->ai_addr)-> |
| 3014 | sin_port; |
| 3015 | break; |
| 3016 | case AF_INET6: |
| 3017 | lport_p = &((struct sockaddr_in6 *)ai->ai_addr)-> |
| 3018 | sin6_port; |
| 3019 | break; |
| 3020 | default: |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3021 | continue; |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 3022 | } |
| 3023 | /* |
| 3024 | * If allocating a port for -R forwards, then use the |
| 3025 | * same port for all address families. |
| 3026 | */ |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3027 | if (type == SSH_CHANNEL_RPORT_LISTENER && fwd->listen_port == 0 && |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 3028 | allocated_listen_port != NULL && *allocated_listen_port > 0) |
| 3029 | *lport_p = htons(*allocated_listen_port); |
| 3030 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3031 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
| 3032 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3033 | error("%s: getnameinfo failed", __func__); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3034 | continue; |
| 3035 | } |
| 3036 | /* Create a port to listen for the host. */ |
Darren Tucker | 7bd98e7 | 2010-01-10 10:31:12 +1100 | [diff] [blame] | 3037 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3038 | if (sock < 0) { |
| 3039 | /* this is no error since kernel may not support ipv6 */ |
| 3040 | verbose("socket: %.100s", strerror(errno)); |
| 3041 | continue; |
| 3042 | } |
Damien Miller | 5e7fd07 | 2005-11-05 14:53:39 +1100 | [diff] [blame] | 3043 | |
| 3044 | channel_set_reuseaddr(sock); |
Damien Miller | 04ee0f8 | 2009-11-18 17:48:30 +1100 | [diff] [blame] | 3045 | if (ai->ai_family == AF_INET6) |
| 3046 | sock_set_v6only(sock); |
Damien Miller | e1383ce | 2002-09-19 11:49:37 +1000 | [diff] [blame] | 3047 | |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 3048 | debug("Local forwarding listening on %s port %s.", |
| 3049 | ntop, strport); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3050 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3051 | /* Bind the socket to the address. */ |
| 3052 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 3053 | /* address can be in use ipv6 address is already bound */ |
Damien Miller | 3c7eeb2 | 2000-03-03 22:35:33 +1100 | [diff] [blame] | 3054 | if (!ai->ai_next) |
| 3055 | error("bind: %.100s", strerror(errno)); |
| 3056 | else |
| 3057 | verbose("bind: %.100s", strerror(errno)); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 3058 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3059 | close(sock); |
| 3060 | continue; |
| 3061 | } |
| 3062 | /* Start listening for connections on the socket. */ |
Darren Tucker | 3175eb9 | 2003-12-09 19:15:11 +1100 | [diff] [blame] | 3063 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3064 | error("listen: %.100s", strerror(errno)); |
| 3065 | close(sock); |
| 3066 | continue; |
| 3067 | } |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 3068 | |
| 3069 | /* |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3070 | * fwd->listen_port == 0 requests a dynamically allocated port - |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 3071 | * record what we got. |
| 3072 | */ |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3073 | if (type == SSH_CHANNEL_RPORT_LISTENER && fwd->listen_port == 0 && |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 3074 | allocated_listen_port != NULL && |
| 3075 | *allocated_listen_port == 0) { |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 3076 | *allocated_listen_port = get_local_port(sock); |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 3077 | debug("Allocated listen port %d", |
| 3078 | *allocated_listen_port); |
| 3079 | } |
| 3080 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3081 | /* Allocate a channel number for the socket. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 3082 | c = channel_new("port listener", type, sock, sock, -1, |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3083 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 3084 | 0, "port listener", 1); |
Damien Miller | a1c1b6c | 2009-01-28 16:29:49 +1100 | [diff] [blame] | 3085 | c->path = xstrdup(host); |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3086 | c->host_port = fwd->connect_port; |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 3087 | c->listening_addr = addr == NULL ? NULL : xstrdup(addr); |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3088 | if (fwd->listen_port == 0 && allocated_listen_port != NULL && |
Darren Tucker | 68afb8c | 2011-10-02 18:59:03 +1100 | [diff] [blame] | 3089 | !(datafellows & SSH_BUG_DYNAMIC_RPORT)) |
| 3090 | c->listening_port = *allocated_listen_port; |
| 3091 | else |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3092 | c->listening_port = fwd->listen_port; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3093 | success = 1; |
| 3094 | } |
| 3095 | if (success == 0) |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3096 | error("%s: cannot listen to port: %d", __func__, |
| 3097 | fwd->listen_port); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3098 | freeaddrinfo(aitop); |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 3099 | return success; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3100 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3101 | |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3102 | static int |
| 3103 | channel_setup_fwd_listener_streamlocal(int type, struct Forward *fwd, |
| 3104 | struct ForwardOptions *fwd_opts) |
| 3105 | { |
| 3106 | struct sockaddr_un sunaddr; |
| 3107 | const char *path; |
| 3108 | Channel *c; |
| 3109 | int port, sock; |
| 3110 | mode_t omask; |
| 3111 | |
| 3112 | switch (type) { |
| 3113 | case SSH_CHANNEL_UNIX_LISTENER: |
| 3114 | if (fwd->connect_path != NULL) { |
| 3115 | if (strlen(fwd->connect_path) > sizeof(sunaddr.sun_path)) { |
| 3116 | error("Local connecting path too long: %s", |
| 3117 | fwd->connect_path); |
| 3118 | return 0; |
| 3119 | } |
| 3120 | path = fwd->connect_path; |
| 3121 | port = PORT_STREAMLOCAL; |
| 3122 | } else { |
| 3123 | if (fwd->connect_host == NULL) { |
| 3124 | error("No forward host name."); |
| 3125 | return 0; |
| 3126 | } |
| 3127 | if (strlen(fwd->connect_host) >= NI_MAXHOST) { |
| 3128 | error("Forward host name too long."); |
| 3129 | return 0; |
| 3130 | } |
| 3131 | path = fwd->connect_host; |
| 3132 | port = fwd->connect_port; |
| 3133 | } |
| 3134 | break; |
| 3135 | case SSH_CHANNEL_RUNIX_LISTENER: |
| 3136 | path = fwd->listen_path; |
| 3137 | port = PORT_STREAMLOCAL; |
| 3138 | break; |
| 3139 | default: |
| 3140 | error("%s: unexpected channel type %d", __func__, type); |
| 3141 | return 0; |
| 3142 | } |
| 3143 | |
| 3144 | if (fwd->listen_path == NULL) { |
| 3145 | error("No forward path name."); |
| 3146 | return 0; |
| 3147 | } |
| 3148 | if (strlen(fwd->listen_path) > sizeof(sunaddr.sun_path)) { |
| 3149 | error("Local listening path too long: %s", fwd->listen_path); |
| 3150 | return 0; |
| 3151 | } |
| 3152 | |
| 3153 | debug3("%s: type %d path %s", __func__, type, fwd->listen_path); |
| 3154 | |
| 3155 | /* Start a Unix domain listener. */ |
| 3156 | omask = umask(fwd_opts->streamlocal_bind_mask); |
| 3157 | sock = unix_listener(fwd->listen_path, SSH_LISTEN_BACKLOG, |
| 3158 | fwd_opts->streamlocal_bind_unlink); |
| 3159 | umask(omask); |
| 3160 | if (sock < 0) |
| 3161 | return 0; |
| 3162 | |
| 3163 | debug("Local forwarding listening on path %s.", fwd->listen_path); |
| 3164 | |
| 3165 | /* Allocate a channel number for the socket. */ |
| 3166 | c = channel_new("unix listener", type, sock, sock, -1, |
| 3167 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
| 3168 | 0, "unix listener", 1); |
| 3169 | c->path = xstrdup(path); |
| 3170 | c->host_port = port; |
| 3171 | c->listening_port = PORT_STREAMLOCAL; |
| 3172 | c->listening_addr = xstrdup(fwd->listen_path); |
| 3173 | return 1; |
| 3174 | } |
| 3175 | |
| 3176 | static int |
| 3177 | channel_cancel_rport_listener_tcpip(const char *host, u_short port) |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 3178 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 3179 | u_int i; |
| 3180 | int found = 0; |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 3181 | |
Darren Tucker | 47eede7 | 2005-03-14 23:08:12 +1100 | [diff] [blame] | 3182 | for (i = 0; i < channels_alloc; i++) { |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 3183 | Channel *c = channels[i]; |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 3184 | if (c == NULL || c->type != SSH_CHANNEL_RPORT_LISTENER) |
| 3185 | continue; |
| 3186 | if (strcmp(c->path, host) == 0 && c->listening_port == port) { |
| 3187 | debug2("%s: close channel %d", __func__, i); |
| 3188 | channel_free(c); |
| 3189 | found = 1; |
| 3190 | } |
| 3191 | } |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 3192 | |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 3193 | return (found); |
| 3194 | } |
| 3195 | |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3196 | static int |
| 3197 | channel_cancel_rport_listener_streamlocal(const char *path) |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 3198 | { |
| 3199 | u_int i; |
| 3200 | int found = 0; |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3201 | |
| 3202 | for (i = 0; i < channels_alloc; i++) { |
| 3203 | Channel *c = channels[i]; |
| 3204 | if (c == NULL || c->type != SSH_CHANNEL_RUNIX_LISTENER) |
| 3205 | continue; |
| 3206 | if (c->path == NULL) |
| 3207 | continue; |
| 3208 | if (strcmp(c->path, path) == 0) { |
| 3209 | debug2("%s: close channel %d", __func__, i); |
| 3210 | channel_free(c); |
| 3211 | found = 1; |
| 3212 | } |
| 3213 | } |
| 3214 | |
| 3215 | return (found); |
| 3216 | } |
| 3217 | |
| 3218 | int |
| 3219 | channel_cancel_rport_listener(struct Forward *fwd) |
| 3220 | { |
| 3221 | if (fwd->listen_path != NULL) |
| 3222 | return channel_cancel_rport_listener_streamlocal(fwd->listen_path); |
| 3223 | else |
| 3224 | return channel_cancel_rport_listener_tcpip(fwd->listen_host, fwd->listen_port); |
| 3225 | } |
| 3226 | |
| 3227 | static int |
| 3228 | channel_cancel_lport_listener_tcpip(const char *lhost, u_short lport, |
| 3229 | int cport, struct ForwardOptions *fwd_opts) |
| 3230 | { |
| 3231 | u_int i; |
| 3232 | int found = 0; |
| 3233 | const char *addr = channel_fwd_bind_addr(lhost, NULL, 1, fwd_opts); |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 3234 | |
| 3235 | for (i = 0; i < channels_alloc; i++) { |
| 3236 | Channel *c = channels[i]; |
| 3237 | if (c == NULL || c->type != SSH_CHANNEL_PORT_LISTENER) |
| 3238 | continue; |
Damien Miller | ff77364 | 2011-09-22 21:39:48 +1000 | [diff] [blame] | 3239 | if (c->listening_port != lport) |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 3240 | continue; |
Damien Miller | ff77364 | 2011-09-22 21:39:48 +1000 | [diff] [blame] | 3241 | if (cport == CHANNEL_CANCEL_PORT_STATIC) { |
| 3242 | /* skip dynamic forwardings */ |
| 3243 | if (c->host_port == 0) |
| 3244 | continue; |
| 3245 | } else { |
| 3246 | if (c->host_port != cport) |
| 3247 | continue; |
| 3248 | } |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 3249 | if ((c->listening_addr == NULL && addr != NULL) || |
| 3250 | (c->listening_addr != NULL && addr == NULL)) |
| 3251 | continue; |
| 3252 | if (addr == NULL || strcmp(c->listening_addr, addr) == 0) { |
Darren Tucker | e6ed839 | 2004-08-29 16:29:44 +1000 | [diff] [blame] | 3253 | debug2("%s: close channel %d", __func__, i); |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 3254 | channel_free(c); |
| 3255 | found = 1; |
| 3256 | } |
| 3257 | } |
| 3258 | |
| 3259 | return (found); |
| 3260 | } |
| 3261 | |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3262 | static int |
| 3263 | channel_cancel_lport_listener_streamlocal(const char *path) |
| 3264 | { |
| 3265 | u_int i; |
| 3266 | int found = 0; |
| 3267 | |
| 3268 | if (path == NULL) { |
| 3269 | error("%s: no path specified.", __func__); |
| 3270 | return 0; |
| 3271 | } |
| 3272 | |
| 3273 | for (i = 0; i < channels_alloc; i++) { |
| 3274 | Channel *c = channels[i]; |
| 3275 | if (c == NULL || c->type != SSH_CHANNEL_UNIX_LISTENER) |
| 3276 | continue; |
| 3277 | if (c->listening_addr == NULL) |
| 3278 | continue; |
| 3279 | if (strcmp(c->listening_addr, path) == 0) { |
| 3280 | debug2("%s: close channel %d", __func__, i); |
| 3281 | channel_free(c); |
| 3282 | found = 1; |
| 3283 | } |
| 3284 | } |
| 3285 | |
| 3286 | return (found); |
| 3287 | } |
| 3288 | |
| 3289 | int |
| 3290 | channel_cancel_lport_listener(struct Forward *fwd, int cport, struct ForwardOptions *fwd_opts) |
| 3291 | { |
| 3292 | if (fwd->listen_path != NULL) |
| 3293 | return channel_cancel_lport_listener_streamlocal(fwd->listen_path); |
| 3294 | else |
| 3295 | return channel_cancel_lport_listener_tcpip(fwd->listen_host, fwd->listen_port, cport, fwd_opts); |
| 3296 | } |
| 3297 | |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 3298 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
| 3299 | int |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3300 | channel_setup_local_fwd_listener(struct Forward *fwd, struct ForwardOptions *fwd_opts) |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 3301 | { |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3302 | if (fwd->listen_path != NULL) { |
| 3303 | return channel_setup_fwd_listener_streamlocal( |
| 3304 | SSH_CHANNEL_UNIX_LISTENER, fwd, fwd_opts); |
| 3305 | } else { |
| 3306 | return channel_setup_fwd_listener_tcpip(SSH_CHANNEL_PORT_LISTENER, |
| 3307 | fwd, NULL, fwd_opts); |
| 3308 | } |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 3309 | } |
| 3310 | |
| 3311 | /* protocol v2 remote port fwd, used by sshd */ |
| 3312 | int |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3313 | channel_setup_remote_fwd_listener(struct Forward *fwd, |
| 3314 | int *allocated_listen_port, struct ForwardOptions *fwd_opts) |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 3315 | { |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3316 | if (fwd->listen_path != NULL) { |
| 3317 | return channel_setup_fwd_listener_streamlocal( |
| 3318 | SSH_CHANNEL_RUNIX_LISTENER, fwd, fwd_opts); |
| 3319 | } else { |
| 3320 | return channel_setup_fwd_listener_tcpip( |
| 3321 | SSH_CHANNEL_RPORT_LISTENER, fwd, allocated_listen_port, |
| 3322 | fwd_opts); |
| 3323 | } |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 3324 | } |
| 3325 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3326 | /* |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 3327 | * Translate the requested rfwd listen host to something usable for |
| 3328 | * this server. |
| 3329 | */ |
| 3330 | static const char * |
| 3331 | channel_rfwd_bind_host(const char *listen_host) |
| 3332 | { |
| 3333 | if (listen_host == NULL) { |
| 3334 | if (datafellows & SSH_BUG_RFWD_ADDR) |
| 3335 | return "127.0.0.1"; |
| 3336 | else |
| 3337 | return "localhost"; |
| 3338 | } else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) { |
| 3339 | if (datafellows & SSH_BUG_RFWD_ADDR) |
| 3340 | return "0.0.0.0"; |
| 3341 | else |
| 3342 | return ""; |
| 3343 | } else |
| 3344 | return listen_host; |
| 3345 | } |
| 3346 | |
| 3347 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3348 | * Initiate forwarding of connections to port "port" on remote host through |
| 3349 | * the secure channel to host:port from local side. |
Darren Tucker | 68afb8c | 2011-10-02 18:59:03 +1100 | [diff] [blame] | 3350 | * Returns handle (index) for updating the dynamic listen port with |
| 3351 | * channel_update_permitted_opens(). |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3352 | */ |
Darren Tucker | e7d4b19 | 2006-07-12 22:17:10 +1000 | [diff] [blame] | 3353 | int |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3354 | channel_request_remote_forwarding(struct Forward *fwd) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3355 | { |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 3356 | int success = 0, idx = -1; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 3357 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3358 | /* Send the forward request to the remote side. */ |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 3359 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
| 3360 | if (fwd->listen_path != NULL) { |
| 3361 | packet_put_cstring("streamlocal-forward@openssh.com"); |
| 3362 | packet_put_char(1); /* boolean: want reply */ |
| 3363 | packet_put_cstring(fwd->listen_path); |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3364 | } else { |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 3365 | packet_put_cstring("tcpip-forward"); |
| 3366 | packet_put_char(1); /* boolean: want reply */ |
| 3367 | packet_put_cstring(channel_rfwd_bind_host(fwd->listen_host)); |
| 3368 | packet_put_int(fwd->listen_port); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 3369 | } |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 3370 | packet_send(); |
| 3371 | packet_write_wait(); |
| 3372 | /* Assume that server accepts the request */ |
| 3373 | success = 1; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 3374 | if (success) { |
Damien Miller | 232cfb1 | 2010-06-26 09:50:30 +1000 | [diff] [blame] | 3375 | /* Record that connection to this host/port is permitted. */ |
deraadt@openbsd.org | 657a5fb | 2015-04-24 01:36:00 +0000 | [diff] [blame] | 3376 | permitted_opens = xreallocarray(permitted_opens, |
Damien Miller | 232cfb1 | 2010-06-26 09:50:30 +1000 | [diff] [blame] | 3377 | num_permitted_opens + 1, sizeof(*permitted_opens)); |
Darren Tucker | 68afb8c | 2011-10-02 18:59:03 +1100 | [diff] [blame] | 3378 | idx = num_permitted_opens++; |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3379 | if (fwd->connect_path != NULL) { |
| 3380 | permitted_opens[idx].host_to_connect = |
| 3381 | xstrdup(fwd->connect_path); |
| 3382 | permitted_opens[idx].port_to_connect = |
| 3383 | PORT_STREAMLOCAL; |
| 3384 | } else { |
| 3385 | permitted_opens[idx].host_to_connect = |
| 3386 | xstrdup(fwd->connect_host); |
| 3387 | permitted_opens[idx].port_to_connect = |
| 3388 | fwd->connect_port; |
| 3389 | } |
| 3390 | if (fwd->listen_path != NULL) { |
| 3391 | permitted_opens[idx].listen_host = NULL; |
| 3392 | permitted_opens[idx].listen_path = |
| 3393 | xstrdup(fwd->listen_path); |
| 3394 | permitted_opens[idx].listen_port = PORT_STREAMLOCAL; |
| 3395 | } else { |
| 3396 | permitted_opens[idx].listen_host = |
| 3397 | fwd->listen_host ? xstrdup(fwd->listen_host) : NULL; |
| 3398 | permitted_opens[idx].listen_path = NULL; |
| 3399 | permitted_opens[idx].listen_port = fwd->listen_port; |
| 3400 | } |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 3401 | permitted_opens[idx].downstream = NULL; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 3402 | } |
Darren Tucker | 68afb8c | 2011-10-02 18:59:03 +1100 | [diff] [blame] | 3403 | return (idx); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3404 | } |
| 3405 | |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3406 | static int |
| 3407 | open_match(ForwardPermission *allowed_open, const char *requestedhost, |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3408 | int requestedport) |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3409 | { |
| 3410 | if (allowed_open->host_to_connect == NULL) |
| 3411 | return 0; |
| 3412 | if (allowed_open->port_to_connect != FWD_PERMIT_ANY_PORT && |
| 3413 | allowed_open->port_to_connect != requestedport) |
| 3414 | return 0; |
dtucker@openbsd.org | d7eabc8 | 2016-07-19 11:38:53 +0000 | [diff] [blame] | 3415 | if (strcmp(allowed_open->host_to_connect, FWD_PERMIT_ANY_HOST) != 0 && |
| 3416 | strcmp(allowed_open->host_to_connect, requestedhost) != 0) |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3417 | return 0; |
| 3418 | return 1; |
| 3419 | } |
| 3420 | |
| 3421 | /* |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3422 | * Note that in the listen host/port case |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3423 | * we don't support FWD_PERMIT_ANY_PORT and |
| 3424 | * need to translate between the configured-host (listen_host) |
| 3425 | * and what we've sent to the remote server (channel_rfwd_bind_host) |
| 3426 | */ |
| 3427 | static int |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3428 | open_listen_match_tcpip(ForwardPermission *allowed_open, |
| 3429 | const char *requestedhost, u_short requestedport, int translate) |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3430 | { |
| 3431 | const char *allowed_host; |
| 3432 | |
| 3433 | if (allowed_open->host_to_connect == NULL) |
| 3434 | return 0; |
| 3435 | if (allowed_open->listen_port != requestedport) |
| 3436 | return 0; |
Damien Miller | 3a48cc0 | 2014-07-06 09:32:49 +1000 | [diff] [blame] | 3437 | if (!translate && allowed_open->listen_host == NULL && |
| 3438 | requestedhost == NULL) |
| 3439 | return 1; |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3440 | allowed_host = translate ? |
| 3441 | channel_rfwd_bind_host(allowed_open->listen_host) : |
| 3442 | allowed_open->listen_host; |
| 3443 | if (allowed_host == NULL || |
| 3444 | strcmp(allowed_host, requestedhost) != 0) |
| 3445 | return 0; |
| 3446 | return 1; |
| 3447 | } |
| 3448 | |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3449 | static int |
| 3450 | open_listen_match_streamlocal(ForwardPermission *allowed_open, |
| 3451 | const char *requestedpath) |
| 3452 | { |
| 3453 | if (allowed_open->host_to_connect == NULL) |
| 3454 | return 0; |
| 3455 | if (allowed_open->listen_port != PORT_STREAMLOCAL) |
| 3456 | return 0; |
| 3457 | if (allowed_open->listen_path == NULL || |
| 3458 | strcmp(allowed_open->listen_path, requestedpath) != 0) |
| 3459 | return 0; |
| 3460 | return 1; |
| 3461 | } |
| 3462 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3463 | /* |
Darren Tucker | fc95970 | 2004-07-17 16:12:08 +1000 | [diff] [blame] | 3464 | * Request cancellation of remote forwarding of connection host:port from |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 3465 | * local side. |
| 3466 | */ |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3467 | static int |
| 3468 | channel_request_rforward_cancel_tcpip(const char *host, u_short port) |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 3469 | { |
| 3470 | int i; |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 3471 | |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 3472 | for (i = 0; i < num_permitted_opens; i++) { |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3473 | if (open_listen_match_tcpip(&permitted_opens[i], host, port, 0)) |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 3474 | break; |
| 3475 | } |
| 3476 | if (i >= num_permitted_opens) { |
| 3477 | debug("%s: requested forward not found", __func__); |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 3478 | return -1; |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 3479 | } |
| 3480 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
| 3481 | packet_put_cstring("cancel-tcpip-forward"); |
| 3482 | packet_put_char(0); |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 3483 | packet_put_cstring(channel_rfwd_bind_host(host)); |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 3484 | packet_put_int(port); |
| 3485 | packet_send(); |
| 3486 | |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3487 | permitted_opens[i].listen_port = 0; |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3488 | permitted_opens[i].port_to_connect = 0; |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 3489 | free(permitted_opens[i].host_to_connect); |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 3490 | permitted_opens[i].host_to_connect = NULL; |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3491 | free(permitted_opens[i].listen_host); |
| 3492 | permitted_opens[i].listen_host = NULL; |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3493 | permitted_opens[i].listen_path = NULL; |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 3494 | permitted_opens[i].downstream = NULL; |
Damien Miller | f6dff7c | 2011-09-22 21:38:52 +1000 | [diff] [blame] | 3495 | |
| 3496 | return 0; |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 3497 | } |
| 3498 | |
| 3499 | /* |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3500 | * Request cancellation of remote forwarding of Unix domain socket |
| 3501 | * path from local side. |
| 3502 | */ |
| 3503 | static int |
| 3504 | channel_request_rforward_cancel_streamlocal(const char *path) |
| 3505 | { |
| 3506 | int i; |
| 3507 | |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3508 | for (i = 0; i < num_permitted_opens; i++) { |
| 3509 | if (open_listen_match_streamlocal(&permitted_opens[i], path)) |
| 3510 | break; |
| 3511 | } |
| 3512 | if (i >= num_permitted_opens) { |
| 3513 | debug("%s: requested forward not found", __func__); |
| 3514 | return -1; |
| 3515 | } |
| 3516 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
| 3517 | packet_put_cstring("cancel-streamlocal-forward@openssh.com"); |
| 3518 | packet_put_char(0); |
| 3519 | packet_put_cstring(path); |
| 3520 | packet_send(); |
| 3521 | |
| 3522 | permitted_opens[i].listen_port = 0; |
| 3523 | permitted_opens[i].port_to_connect = 0; |
| 3524 | free(permitted_opens[i].host_to_connect); |
| 3525 | permitted_opens[i].host_to_connect = NULL; |
| 3526 | permitted_opens[i].listen_host = NULL; |
| 3527 | free(permitted_opens[i].listen_path); |
| 3528 | permitted_opens[i].listen_path = NULL; |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 3529 | permitted_opens[i].downstream = NULL; |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3530 | |
| 3531 | return 0; |
| 3532 | } |
| 3533 | |
| 3534 | /* |
| 3535 | * Request cancellation of remote forwarding of a connection from local side. |
| 3536 | */ |
| 3537 | int |
| 3538 | channel_request_rforward_cancel(struct Forward *fwd) |
| 3539 | { |
| 3540 | if (fwd->listen_path != NULL) { |
| 3541 | return (channel_request_rforward_cancel_streamlocal( |
| 3542 | fwd->listen_path)); |
| 3543 | } else { |
| 3544 | return (channel_request_rforward_cancel_tcpip(fwd->listen_host, |
| 3545 | fwd->listen_port ? fwd->listen_port : fwd->allocated_port)); |
| 3546 | } |
| 3547 | } |
| 3548 | |
| 3549 | /* |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3550 | * Permits opening to any host/port if permitted_opens[] is empty. This is |
| 3551 | * usually called by the server, because the user could connect to any port |
| 3552 | * anyway, and the server has no way to know but to trust the client anyway. |
| 3553 | */ |
| 3554 | void |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 3555 | channel_permit_all_opens(void) |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3556 | { |
| 3557 | if (num_permitted_opens == 0) |
| 3558 | all_opens_permitted = 1; |
| 3559 | } |
| 3560 | |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 3561 | void |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3562 | channel_add_permitted_opens(char *host, int port) |
| 3563 | { |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3564 | debug("allow port forwarding to host %s port %d", host, port); |
| 3565 | |
deraadt@openbsd.org | 657a5fb | 2015-04-24 01:36:00 +0000 | [diff] [blame] | 3566 | permitted_opens = xreallocarray(permitted_opens, |
Damien Miller | 232cfb1 | 2010-06-26 09:50:30 +1000 | [diff] [blame] | 3567 | num_permitted_opens + 1, sizeof(*permitted_opens)); |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3568 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); |
| 3569 | permitted_opens[num_permitted_opens].port_to_connect = port; |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3570 | permitted_opens[num_permitted_opens].listen_host = NULL; |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3571 | permitted_opens[num_permitted_opens].listen_path = NULL; |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3572 | permitted_opens[num_permitted_opens].listen_port = 0; |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 3573 | permitted_opens[num_permitted_opens].downstream = NULL; |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3574 | num_permitted_opens++; |
| 3575 | |
| 3576 | all_opens_permitted = 0; |
| 3577 | } |
| 3578 | |
Darren Tucker | 68afb8c | 2011-10-02 18:59:03 +1100 | [diff] [blame] | 3579 | /* |
| 3580 | * Update the listen port for a dynamic remote forward, after |
| 3581 | * the actual 'newport' has been allocated. If 'newport' < 0 is |
| 3582 | * passed then they entry will be invalidated. |
| 3583 | */ |
| 3584 | void |
| 3585 | channel_update_permitted_opens(int idx, int newport) |
| 3586 | { |
| 3587 | if (idx < 0 || idx >= num_permitted_opens) { |
| 3588 | debug("channel_update_permitted_opens: index out of range:" |
| 3589 | " %d num_permitted_opens %d", idx, num_permitted_opens); |
| 3590 | return; |
| 3591 | } |
| 3592 | debug("%s allowed port %d for forwarding to host %s port %d", |
| 3593 | newport > 0 ? "Updating" : "Removing", |
| 3594 | newport, |
| 3595 | permitted_opens[idx].host_to_connect, |
| 3596 | permitted_opens[idx].port_to_connect); |
| 3597 | if (newport >= 0) { |
| 3598 | permitted_opens[idx].listen_port = |
| 3599 | (datafellows & SSH_BUG_DYNAMIC_RPORT) ? 0 : newport; |
| 3600 | } else { |
| 3601 | permitted_opens[idx].listen_port = 0; |
| 3602 | permitted_opens[idx].port_to_connect = 0; |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 3603 | free(permitted_opens[idx].host_to_connect); |
Darren Tucker | 68afb8c | 2011-10-02 18:59:03 +1100 | [diff] [blame] | 3604 | permitted_opens[idx].host_to_connect = NULL; |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3605 | free(permitted_opens[idx].listen_host); |
| 3606 | permitted_opens[idx].listen_host = NULL; |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3607 | free(permitted_opens[idx].listen_path); |
| 3608 | permitted_opens[idx].listen_path = NULL; |
Darren Tucker | 68afb8c | 2011-10-02 18:59:03 +1100 | [diff] [blame] | 3609 | } |
| 3610 | } |
| 3611 | |
Damien Miller | a765cf4 | 2006-07-24 14:08:13 +1000 | [diff] [blame] | 3612 | int |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3613 | channel_add_adm_permitted_opens(char *host, int port) |
| 3614 | { |
Damien Miller | a765cf4 | 2006-07-24 14:08:13 +1000 | [diff] [blame] | 3615 | debug("config allows port forwarding to host %s port %d", host, port); |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3616 | |
deraadt@openbsd.org | 657a5fb | 2015-04-24 01:36:00 +0000 | [diff] [blame] | 3617 | permitted_adm_opens = xreallocarray(permitted_adm_opens, |
Damien Miller | 232cfb1 | 2010-06-26 09:50:30 +1000 | [diff] [blame] | 3618 | num_adm_permitted_opens + 1, sizeof(*permitted_adm_opens)); |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3619 | permitted_adm_opens[num_adm_permitted_opens].host_to_connect |
| 3620 | = xstrdup(host); |
| 3621 | permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port; |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3622 | permitted_adm_opens[num_adm_permitted_opens].listen_host = NULL; |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3623 | permitted_adm_opens[num_adm_permitted_opens].listen_path = NULL; |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3624 | permitted_adm_opens[num_adm_permitted_opens].listen_port = 0; |
Damien Miller | a765cf4 | 2006-07-24 14:08:13 +1000 | [diff] [blame] | 3625 | return ++num_adm_permitted_opens; |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3626 | } |
| 3627 | |
| 3628 | void |
Damien Miller | c608148 | 2012-04-22 11:18:53 +1000 | [diff] [blame] | 3629 | channel_disable_adm_local_opens(void) |
| 3630 | { |
Damien Miller | aa5b3f8 | 2012-12-03 09:50:54 +1100 | [diff] [blame] | 3631 | channel_clear_adm_permitted_opens(); |
dtucker@openbsd.org | 297060f | 2015-05-08 03:25:07 +0000 | [diff] [blame] | 3632 | permitted_adm_opens = xcalloc(sizeof(*permitted_adm_opens), 1); |
Damien Miller | aa5b3f8 | 2012-12-03 09:50:54 +1100 | [diff] [blame] | 3633 | permitted_adm_opens[num_adm_permitted_opens].host_to_connect = NULL; |
| 3634 | num_adm_permitted_opens = 1; |
Damien Miller | c608148 | 2012-04-22 11:18:53 +1000 | [diff] [blame] | 3635 | } |
| 3636 | |
| 3637 | void |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3638 | channel_clear_permitted_opens(void) |
| 3639 | { |
| 3640 | int i; |
| 3641 | |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3642 | for (i = 0; i < num_permitted_opens; i++) { |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 3643 | free(permitted_opens[i].host_to_connect); |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3644 | free(permitted_opens[i].listen_host); |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3645 | free(permitted_opens[i].listen_path); |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3646 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 3647 | free(permitted_opens); |
| 3648 | permitted_opens = NULL; |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3649 | num_permitted_opens = 0; |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3650 | } |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3651 | |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3652 | void |
| 3653 | channel_clear_adm_permitted_opens(void) |
| 3654 | { |
| 3655 | int i; |
| 3656 | |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3657 | for (i = 0; i < num_adm_permitted_opens; i++) { |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 3658 | free(permitted_adm_opens[i].host_to_connect); |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3659 | free(permitted_adm_opens[i].listen_host); |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3660 | free(permitted_adm_opens[i].listen_path); |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3661 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 3662 | free(permitted_adm_opens); |
| 3663 | permitted_adm_opens = NULL; |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3664 | num_adm_permitted_opens = 0; |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3665 | } |
| 3666 | |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 3667 | void |
| 3668 | channel_print_adm_permitted_opens(void) |
| 3669 | { |
Damien Miller | 6ef1749 | 2008-07-16 22:42:06 +1000 | [diff] [blame] | 3670 | int i; |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 3671 | |
Damien Miller | b53d8a1 | 2009-01-28 16:13:04 +1100 | [diff] [blame] | 3672 | printf("permitopen"); |
Darren Tucker | 22662e8 | 2008-11-11 16:40:22 +1100 | [diff] [blame] | 3673 | if (num_adm_permitted_opens == 0) { |
Damien Miller | b53d8a1 | 2009-01-28 16:13:04 +1100 | [diff] [blame] | 3674 | printf(" any\n"); |
Darren Tucker | 22662e8 | 2008-11-11 16:40:22 +1100 | [diff] [blame] | 3675 | return; |
| 3676 | } |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 3677 | for (i = 0; i < num_adm_permitted_opens; i++) |
Damien Miller | c608148 | 2012-04-22 11:18:53 +1000 | [diff] [blame] | 3678 | if (permitted_adm_opens[i].host_to_connect == NULL) |
| 3679 | printf(" none"); |
| 3680 | else |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 3681 | printf(" %s:%d", permitted_adm_opens[i].host_to_connect, |
| 3682 | permitted_adm_opens[i].port_to_connect); |
Damien Miller | b53d8a1 | 2009-01-28 16:13:04 +1100 | [diff] [blame] | 3683 | printf("\n"); |
Darren Tucker | e7140f2 | 2008-06-10 23:01:51 +1000 | [diff] [blame] | 3684 | } |
| 3685 | |
Darren Tucker | 1338b9e | 2011-10-02 18:57:35 +1100 | [diff] [blame] | 3686 | /* returns port number, FWD_PERMIT_ANY_PORT or -1 on error */ |
| 3687 | int |
| 3688 | permitopen_port(const char *p) |
| 3689 | { |
| 3690 | int port; |
| 3691 | |
| 3692 | if (strcmp(p, "*") == 0) |
| 3693 | return FWD_PERMIT_ANY_PORT; |
| 3694 | if ((port = a2port(p)) > 0) |
| 3695 | return port; |
| 3696 | return -1; |
| 3697 | } |
| 3698 | |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3699 | /* Try to start non-blocking connect to next host in cctx list */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 3700 | static int |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3701 | connect_next(struct channel_connect *cctx) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3702 | { |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3703 | int sock, saved_errno; |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3704 | struct sockaddr_un *sunaddr; |
deraadt@openbsd.org | 9136ec1 | 2016-09-12 01:22:38 +0000 | [diff] [blame] | 3705 | char ntop[NI_MAXHOST], strport[MAXIMUM(NI_MAXSERV,sizeof(sunaddr->sun_path))]; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3706 | |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3707 | for (; cctx->ai; cctx->ai = cctx->ai->ai_next) { |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3708 | switch (cctx->ai->ai_family) { |
| 3709 | case AF_UNIX: |
| 3710 | /* unix:pathname instead of host:port */ |
| 3711 | sunaddr = (struct sockaddr_un *)cctx->ai->ai_addr; |
| 3712 | strlcpy(ntop, "unix", sizeof(ntop)); |
| 3713 | strlcpy(strport, sunaddr->sun_path, sizeof(strport)); |
| 3714 | break; |
| 3715 | case AF_INET: |
| 3716 | case AF_INET6: |
| 3717 | if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen, |
| 3718 | ntop, sizeof(ntop), strport, sizeof(strport), |
| 3719 | NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
| 3720 | error("connect_next: getnameinfo failed"); |
| 3721 | continue; |
| 3722 | } |
| 3723 | break; |
| 3724 | default: |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3725 | continue; |
| 3726 | } |
Darren Tucker | 7bd98e7 | 2010-01-10 10:31:12 +1100 | [diff] [blame] | 3727 | if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype, |
| 3728 | cctx->ai->ai_protocol)) == -1) { |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3729 | if (cctx->ai->ai_next == NULL) |
Damien Miller | b46b9f3 | 2003-01-10 21:45:12 +1100 | [diff] [blame] | 3730 | error("socket: %.100s", strerror(errno)); |
| 3731 | else |
| 3732 | verbose("socket: %.100s", strerror(errno)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3733 | continue; |
| 3734 | } |
Damien Miller | 232711f | 2004-06-15 10:35:30 +1000 | [diff] [blame] | 3735 | if (set_nonblock(sock) == -1) |
| 3736 | fatal("%s: set_nonblock(%d)", __func__, sock); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3737 | if (connect(sock, cctx->ai->ai_addr, |
| 3738 | cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) { |
| 3739 | debug("connect_next: host %.100s ([%.100s]:%s): " |
| 3740 | "%.100s", cctx->host, ntop, strport, |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3741 | strerror(errno)); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3742 | saved_errno = errno; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3743 | close(sock); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3744 | errno = saved_errno; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 3745 | continue; /* fail -- try next */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3746 | } |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3747 | if (cctx->ai->ai_family != AF_UNIX) |
| 3748 | set_nodelay(sock); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3749 | debug("connect_next: host %.100s ([%.100s]:%s) " |
| 3750 | "in progress, fd=%d", cctx->host, ntop, strport, sock); |
| 3751 | cctx->ai = cctx->ai->ai_next; |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3752 | return sock; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3753 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 3754 | return -1; |
| 3755 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 3756 | |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3757 | static void |
| 3758 | channel_connect_ctx_free(struct channel_connect *cctx) |
| 3759 | { |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 3760 | free(cctx->host); |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3761 | if (cctx->aitop) { |
| 3762 | if (cctx->aitop->ai_family == AF_UNIX) |
| 3763 | free(cctx->aitop); |
| 3764 | else |
| 3765 | freeaddrinfo(cctx->aitop); |
| 3766 | } |
Damien Miller | 1d2c456 | 2014-02-04 11:18:20 +1100 | [diff] [blame] | 3767 | memset(cctx, 0, sizeof(*cctx)); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3768 | } |
| 3769 | |
dtucker@openbsd.org | 858252f | 2017-02-01 02:59:09 +0000 | [diff] [blame] | 3770 | /* |
| 3771 | * Return CONNECTING channel to remote host:port or local socket path, |
| 3772 | * passing back the failure reason if appropriate. |
| 3773 | */ |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3774 | static Channel * |
dtucker@openbsd.org | 858252f | 2017-02-01 02:59:09 +0000 | [diff] [blame] | 3775 | connect_to_reason(const char *name, int port, char *ctype, char *rname, |
| 3776 | int *reason, const char **errmsg) |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3777 | { |
| 3778 | struct addrinfo hints; |
| 3779 | int gaierr; |
| 3780 | int sock = -1; |
| 3781 | char strport[NI_MAXSERV]; |
| 3782 | struct channel_connect cctx; |
| 3783 | Channel *c; |
| 3784 | |
Damien Miller | 2bcb866 | 2008-07-12 17:12:29 +1000 | [diff] [blame] | 3785 | memset(&cctx, 0, sizeof(cctx)); |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3786 | |
| 3787 | if (port == PORT_STREAMLOCAL) { |
| 3788 | struct sockaddr_un *sunaddr; |
| 3789 | struct addrinfo *ai; |
| 3790 | |
| 3791 | if (strlen(name) > sizeof(sunaddr->sun_path)) { |
| 3792 | error("%.100s: %.100s", name, strerror(ENAMETOOLONG)); |
| 3793 | return (NULL); |
| 3794 | } |
| 3795 | |
| 3796 | /* |
| 3797 | * Fake up a struct addrinfo for AF_UNIX connections. |
| 3798 | * channel_connect_ctx_free() must check ai_family |
| 3799 | * and use free() not freeaddirinfo() for AF_UNIX. |
| 3800 | */ |
| 3801 | ai = xmalloc(sizeof(*ai) + sizeof(*sunaddr)); |
| 3802 | memset(ai, 0, sizeof(*ai) + sizeof(*sunaddr)); |
| 3803 | ai->ai_addr = (struct sockaddr *)(ai + 1); |
| 3804 | ai->ai_addrlen = sizeof(*sunaddr); |
| 3805 | ai->ai_family = AF_UNIX; |
| 3806 | ai->ai_socktype = SOCK_STREAM; |
| 3807 | ai->ai_protocol = PF_UNSPEC; |
| 3808 | sunaddr = (struct sockaddr_un *)ai->ai_addr; |
| 3809 | sunaddr->sun_family = AF_UNIX; |
| 3810 | strlcpy(sunaddr->sun_path, name, sizeof(sunaddr->sun_path)); |
| 3811 | cctx.aitop = ai; |
| 3812 | } else { |
| 3813 | memset(&hints, 0, sizeof(hints)); |
| 3814 | hints.ai_family = IPv4or6; |
| 3815 | hints.ai_socktype = SOCK_STREAM; |
| 3816 | snprintf(strport, sizeof strport, "%d", port); |
dtucker@openbsd.org | 858252f | 2017-02-01 02:59:09 +0000 | [diff] [blame] | 3817 | if ((gaierr = getaddrinfo(name, strport, &hints, &cctx.aitop)) |
| 3818 | != 0) { |
| 3819 | if (errmsg != NULL) |
| 3820 | *errmsg = ssh_gai_strerror(gaierr); |
| 3821 | if (reason != NULL) |
| 3822 | *reason = SSH2_OPEN_CONNECT_FAILED; |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3823 | error("connect_to %.100s: unknown host (%s)", name, |
| 3824 | ssh_gai_strerror(gaierr)); |
| 3825 | return NULL; |
| 3826 | } |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3827 | } |
| 3828 | |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3829 | cctx.host = xstrdup(name); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3830 | cctx.port = port; |
| 3831 | cctx.ai = cctx.aitop; |
| 3832 | |
| 3833 | if ((sock = connect_next(&cctx)) == -1) { |
| 3834 | error("connect to %.100s port %d failed: %s", |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3835 | name, port, strerror(errno)); |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3836 | channel_connect_ctx_free(&cctx); |
| 3837 | return NULL; |
| 3838 | } |
| 3839 | c = channel_new(ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1, |
| 3840 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1); |
| 3841 | c->connect_ctx = cctx; |
| 3842 | return c; |
| 3843 | } |
| 3844 | |
dtucker@openbsd.org | 858252f | 2017-02-01 02:59:09 +0000 | [diff] [blame] | 3845 | /* Return CONNECTING channel to remote host:port or local socket path */ |
| 3846 | static Channel * |
| 3847 | connect_to(const char *name, int port, char *ctype, char *rname) |
| 3848 | { |
| 3849 | return connect_to_reason(name, port, ctype, rname, NULL, NULL); |
| 3850 | } |
| 3851 | |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 3852 | /* |
| 3853 | * returns either the newly connected channel or the downstream channel |
| 3854 | * that needs to deal with this connection. |
| 3855 | */ |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3856 | Channel * |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3857 | channel_connect_by_listen_address(const char *listen_host, |
| 3858 | u_short listen_port, char *ctype, char *rname) |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3859 | { |
| 3860 | int i; |
| 3861 | |
| 3862 | for (i = 0; i < num_permitted_opens; i++) { |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3863 | if (open_listen_match_tcpip(&permitted_opens[i], listen_host, |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3864 | listen_port, 1)) { |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 3865 | if (permitted_opens[i].downstream) |
| 3866 | return permitted_opens[i].downstream; |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3867 | return connect_to( |
| 3868 | permitted_opens[i].host_to_connect, |
| 3869 | permitted_opens[i].port_to_connect, ctype, rname); |
| 3870 | } |
| 3871 | } |
| 3872 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
| 3873 | listen_port); |
| 3874 | return NULL; |
| 3875 | } |
| 3876 | |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3877 | Channel * |
| 3878 | channel_connect_by_listen_path(const char *path, char *ctype, char *rname) |
| 3879 | { |
| 3880 | int i; |
| 3881 | |
| 3882 | for (i = 0; i < num_permitted_opens; i++) { |
| 3883 | if (open_listen_match_streamlocal(&permitted_opens[i], path)) { |
| 3884 | return connect_to( |
| 3885 | permitted_opens[i].host_to_connect, |
| 3886 | permitted_opens[i].port_to_connect, ctype, rname); |
| 3887 | } |
| 3888 | } |
| 3889 | error("WARNING: Server requests forwarding for unknown path %.100s", |
| 3890 | path); |
| 3891 | return NULL; |
| 3892 | } |
| 3893 | |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3894 | /* Check if connecting to that port is permitted and connect. */ |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3895 | Channel * |
dtucker@openbsd.org | 858252f | 2017-02-01 02:59:09 +0000 | [diff] [blame] | 3896 | channel_connect_to_port(const char *host, u_short port, char *ctype, |
| 3897 | char *rname, int *reason, const char **errmsg) |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3898 | { |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3899 | int i, permit, permit_adm = 1; |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3900 | |
| 3901 | permit = all_opens_permitted; |
| 3902 | if (!permit) { |
| 3903 | for (i = 0; i < num_permitted_opens; i++) |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3904 | if (open_match(&permitted_opens[i], host, port)) { |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3905 | permit = 1; |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3906 | break; |
| 3907 | } |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3908 | } |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3909 | |
| 3910 | if (num_adm_permitted_opens > 0) { |
| 3911 | permit_adm = 0; |
| 3912 | for (i = 0; i < num_adm_permitted_opens; i++) |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3913 | if (open_match(&permitted_adm_opens[i], host, port)) { |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3914 | permit_adm = 1; |
Damien Miller | 4b3ed64 | 2014-07-02 15:29:40 +1000 | [diff] [blame] | 3915 | break; |
| 3916 | } |
Damien Miller | 9b439df | 2006-07-24 14:04:00 +1000 | [diff] [blame] | 3917 | } |
| 3918 | |
| 3919 | if (!permit || !permit_adm) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 3920 | logit("Received request to connect to host %.100s port %d, " |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3921 | "but the request was denied.", host, port); |
dtucker@openbsd.org | 858252f | 2017-02-01 02:59:09 +0000 | [diff] [blame] | 3922 | if (reason != NULL) |
| 3923 | *reason = SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED; |
Damien Miller | bd74025 | 2008-05-19 15:37:09 +1000 | [diff] [blame] | 3924 | return NULL; |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3925 | } |
dtucker@openbsd.org | 858252f | 2017-02-01 02:59:09 +0000 | [diff] [blame] | 3926 | return connect_to_reason(host, port, ctype, rname, reason, errmsg); |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 3927 | } |
| 3928 | |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 3929 | /* Check if connecting to that path is permitted and connect. */ |
| 3930 | Channel * |
| 3931 | channel_connect_to_path(const char *path, char *ctype, char *rname) |
| 3932 | { |
| 3933 | int i, permit, permit_adm = 1; |
| 3934 | |
| 3935 | permit = all_opens_permitted; |
| 3936 | if (!permit) { |
| 3937 | for (i = 0; i < num_permitted_opens; i++) |
| 3938 | if (open_match(&permitted_opens[i], path, PORT_STREAMLOCAL)) { |
| 3939 | permit = 1; |
| 3940 | break; |
| 3941 | } |
| 3942 | } |
| 3943 | |
| 3944 | if (num_adm_permitted_opens > 0) { |
| 3945 | permit_adm = 0; |
| 3946 | for (i = 0; i < num_adm_permitted_opens; i++) |
| 3947 | if (open_match(&permitted_adm_opens[i], path, PORT_STREAMLOCAL)) { |
| 3948 | permit_adm = 1; |
| 3949 | break; |
| 3950 | } |
| 3951 | } |
| 3952 | |
| 3953 | if (!permit || !permit_adm) { |
| 3954 | logit("Received request to connect to path %.100s, " |
| 3955 | "but the request was denied.", path); |
| 3956 | return NULL; |
| 3957 | } |
| 3958 | return connect_to(path, PORT_STREAMLOCAL, ctype, rname); |
| 3959 | } |
| 3960 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 3961 | void |
| 3962 | channel_send_window_changes(void) |
| 3963 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 3964 | u_int i; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 3965 | struct winsize ws; |
| 3966 | |
| 3967 | for (i = 0; i < channels_alloc; i++) { |
Darren Tucker | 47eede7 | 2005-03-14 23:08:12 +1100 | [diff] [blame] | 3968 | if (channels[i] == NULL || !channels[i]->client_tty || |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 3969 | channels[i]->type != SSH_CHANNEL_OPEN) |
| 3970 | continue; |
| 3971 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) |
| 3972 | continue; |
| 3973 | channel_request_start(i, "window-change", 0); |
Damien Miller | 71a7367 | 2006-03-26 14:04:36 +1100 | [diff] [blame] | 3974 | packet_put_int((u_int)ws.ws_col); |
| 3975 | packet_put_int((u_int)ws.ws_row); |
| 3976 | packet_put_int((u_int)ws.ws_xpixel); |
| 3977 | packet_put_int((u_int)ws.ws_ypixel); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 3978 | packet_send(); |
| 3979 | } |
| 3980 | } |
| 3981 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 3982 | /* -- X11 forwarding */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3983 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3984 | /* |
| 3985 | * Creates an internet domain socket for listening for X11 connections. |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 3986 | * Returns 0 and a suitable display number for the DISPLAY variable |
| 3987 | * stored in display_numberp , or -1 if an error occurs. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3988 | */ |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 3989 | int |
Damien Miller | 95c249f | 2002-02-05 12:11:34 +1100 | [diff] [blame] | 3990 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 3991 | int single_connection, u_int *display_numberp, int **chanids) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3992 | { |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 3993 | Channel *nc = NULL; |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 3994 | int display_number, sock; |
| 3995 | u_short port; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 3996 | struct addrinfo hints, *ai, *aitop; |
| 3997 | char strport[NI_MAXSERV]; |
| 3998 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3999 | |
Darren Tucker | d3d0fa1 | 2005-10-03 18:03:05 +1000 | [diff] [blame] | 4000 | if (chanids == NULL) |
| 4001 | return -1; |
| 4002 | |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 4003 | for (display_number = x11_display_offset; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 4004 | display_number < MAX_DISPLAYS; |
| 4005 | display_number++) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4006 | port = 6000 + display_number; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4007 | memset(&hints, 0, sizeof(hints)); |
| 4008 | hints.ai_family = IPv4or6; |
Damien Miller | 95c249f | 2002-02-05 12:11:34 +1100 | [diff] [blame] | 4009 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4010 | hints.ai_socktype = SOCK_STREAM; |
| 4011 | snprintf(strport, sizeof strport, "%d", port); |
| 4012 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { |
Darren Tucker | 4abde77 | 2007-12-29 02:43:51 +1100 | [diff] [blame] | 4013 | error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr)); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 4014 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4015 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4016 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 4017 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 4018 | continue; |
Darren Tucker | 7bd98e7 | 2010-01-10 10:31:12 +1100 | [diff] [blame] | 4019 | sock = socket(ai->ai_family, ai->ai_socktype, |
| 4020 | ai->ai_protocol); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4021 | if (sock < 0) { |
Damien Miller | 6480c63 | 2010-03-26 11:09:44 +1100 | [diff] [blame] | 4022 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT) |
| 4023 | #ifdef EPFNOSUPPORT |
| 4024 | && (errno != EPFNOSUPPORT) |
| 4025 | #endif |
| 4026 | ) { |
Damien Miller | e219273 | 2000-01-17 13:22:55 +1100 | [diff] [blame] | 4027 | error("socket: %.100s", strerror(errno)); |
Damien Miller | 3e4dffb | 2004-06-15 10:27:15 +1000 | [diff] [blame] | 4028 | freeaddrinfo(aitop); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 4029 | return -1; |
Damien Miller | e219273 | 2000-01-17 13:22:55 +1100 | [diff] [blame] | 4030 | } else { |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 4031 | debug("x11_create_display_inet: Socket family %d not supported", |
| 4032 | ai->ai_family); |
Damien Miller | e219273 | 2000-01-17 13:22:55 +1100 | [diff] [blame] | 4033 | continue; |
| 4034 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4035 | } |
Damien Miller | 04ee0f8 | 2009-11-18 17:48:30 +1100 | [diff] [blame] | 4036 | if (ai->ai_family == AF_INET6) |
| 4037 | sock_set_v6only(sock); |
Damien Miller | 4401e45 | 2008-06-12 06:05:12 +1000 | [diff] [blame] | 4038 | if (x11_use_localhost) |
| 4039 | channel_set_reuseaddr(sock); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4040 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 4041 | debug2("bind port %d: %.100s", port, strerror(errno)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4042 | close(sock); |
Damien Miller | 3c7eeb2 | 2000-03-03 22:35:33 +1100 | [diff] [blame] | 4043 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4044 | for (n = 0; n < num_socks; n++) { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4045 | close(socks[n]); |
| 4046 | } |
| 4047 | num_socks = 0; |
| 4048 | break; |
| 4049 | } |
| 4050 | socks[num_socks++] = sock; |
| 4051 | if (num_socks == NUM_SOCKS) |
| 4052 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4053 | } |
Ben Lindstrom | 87b147f | 2001-01-25 00:41:12 +0000 | [diff] [blame] | 4054 | freeaddrinfo(aitop); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4055 | if (num_socks > 0) |
| 4056 | break; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4057 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4058 | if (display_number >= MAX_DISPLAYS) { |
| 4059 | error("Failed to allocate internet-domain X11 display socket."); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 4060 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4061 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4062 | /* Start listening for connections on the socket. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4063 | for (n = 0; n < num_socks; n++) { |
| 4064 | sock = socks[n]; |
Darren Tucker | 3175eb9 | 2003-12-09 19:15:11 +1100 | [diff] [blame] | 4065 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4066 | error("listen: %.100s", strerror(errno)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4067 | close(sock); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 4068 | return -1; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4069 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4070 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4071 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4072 | /* Allocate a channel for each socket. */ |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 4073 | *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4074 | for (n = 0; n < num_socks; n++) { |
| 4075 | sock = socks[n]; |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 4076 | nc = channel_new("x11 listener", |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4077 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
| 4078 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 4079 | 0, "X11 inet listener", 1); |
Damien Miller | 699d003 | 2002-02-08 22:07:16 +1100 | [diff] [blame] | 4080 | nc->single_connection = single_connection; |
Darren Tucker | d3d0fa1 | 2005-10-03 18:03:05 +1000 | [diff] [blame] | 4081 | (*chanids)[n] = nc->self; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4082 | } |
Darren Tucker | d3d0fa1 | 2005-10-03 18:03:05 +1000 | [diff] [blame] | 4083 | (*chanids)[n] = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4084 | |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 4085 | /* Return the display number for the DISPLAY environment variable. */ |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 4086 | *display_numberp = display_number; |
| 4087 | return (0); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4088 | } |
| 4089 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 4090 | static int |
Damien Miller | 819dbb6 | 2009-01-21 16:46:26 +1100 | [diff] [blame] | 4091 | connect_local_xsocket_path(const char *pathname) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4092 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4093 | int sock; |
| 4094 | struct sockaddr_un addr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4095 | |
Damien Miller | 3afe375 | 2001-12-21 12:39:51 +1100 | [diff] [blame] | 4096 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 4097 | if (sock < 0) |
| 4098 | error("socket: %.100s", strerror(errno)); |
| 4099 | memset(&addr, 0, sizeof(addr)); |
| 4100 | addr.sun_family = AF_UNIX; |
Damien Miller | 819dbb6 | 2009-01-21 16:46:26 +1100 | [diff] [blame] | 4101 | strlcpy(addr.sun_path, pathname, sizeof addr.sun_path); |
Damien Miller | 9096740 | 2006-03-26 14:07:26 +1100 | [diff] [blame] | 4102 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) |
Damien Miller | 3afe375 | 2001-12-21 12:39:51 +1100 | [diff] [blame] | 4103 | return sock; |
| 4104 | close(sock); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4105 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
| 4106 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4107 | } |
| 4108 | |
Damien Miller | 819dbb6 | 2009-01-21 16:46:26 +1100 | [diff] [blame] | 4109 | static int |
| 4110 | connect_local_xsocket(u_int dnr) |
| 4111 | { |
| 4112 | char buf[1024]; |
| 4113 | snprintf(buf, sizeof buf, _PATH_UNIX_X, dnr); |
| 4114 | return connect_local_xsocket_path(buf); |
| 4115 | } |
| 4116 | |
Darren Tucker | da39b09 | 2017-03-10 13:22:32 +1100 | [diff] [blame] | 4117 | #ifdef __APPLE__ |
| 4118 | static int |
| 4119 | is_path_to_xsocket(const char *display, char *path, size_t pathlen) |
| 4120 | { |
| 4121 | struct stat sbuf; |
| 4122 | |
| 4123 | if (strlcpy(path, display, pathlen) >= pathlen) { |
| 4124 | error("%s: display path too long", __func__); |
| 4125 | return 0; |
| 4126 | } |
| 4127 | if (display[0] != '/') |
| 4128 | return 0; |
| 4129 | if (stat(path, &sbuf) == 0) { |
| 4130 | return 1; |
| 4131 | } else { |
| 4132 | char *dot = strrchr(path, '.'); |
| 4133 | if (dot != NULL) { |
| 4134 | *dot = '\0'; |
| 4135 | if (stat(path, &sbuf) == 0) { |
| 4136 | return 1; |
| 4137 | } |
| 4138 | } |
| 4139 | } |
| 4140 | return 0; |
| 4141 | } |
| 4142 | #endif |
| 4143 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4144 | int |
| 4145 | x11_connect_display(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4146 | { |
Damien Miller | 57c4e87 | 2006-03-31 23:11:07 +1100 | [diff] [blame] | 4147 | u_int display_number; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4148 | const char *display; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4149 | char buf[1024], *cp; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4150 | struct addrinfo hints, *ai, *aitop; |
| 4151 | char strport[NI_MAXSERV]; |
Damien Miller | 57c4e87 | 2006-03-31 23:11:07 +1100 | [diff] [blame] | 4152 | int gaierr, sock = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4153 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4154 | /* Try to open a socket for the local X server. */ |
| 4155 | display = getenv("DISPLAY"); |
| 4156 | if (!display) { |
| 4157 | error("DISPLAY not set."); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4158 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4159 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 4160 | /* |
| 4161 | * Now we decode the value of the DISPLAY variable and make a |
| 4162 | * connection to the real X server. |
| 4163 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4164 | |
Damien Miller | 819dbb6 | 2009-01-21 16:46:26 +1100 | [diff] [blame] | 4165 | #ifdef __APPLE__ |
Darren Tucker | da39b09 | 2017-03-10 13:22:32 +1100 | [diff] [blame] | 4166 | /* Check if display is a path to a socket (as set by launchd). */ |
| 4167 | { |
| 4168 | char path[PATH_MAX]; |
Damien Miller | 819dbb6 | 2009-01-21 16:46:26 +1100 | [diff] [blame] | 4169 | |
Darren Tucker | da39b09 | 2017-03-10 13:22:32 +1100 | [diff] [blame] | 4170 | if (is_path_to_xsocket(display, path, sizeof(path))) { |
| 4171 | debug("x11_connect_display: $DISPLAY is launchd"); |
| 4172 | |
| 4173 | /* Create a socket. */ |
| 4174 | sock = connect_local_xsocket_path(path); |
| 4175 | if (sock < 0) |
| 4176 | return -1; |
| 4177 | |
| 4178 | /* OK, we now have a connection to the display. */ |
| 4179 | return sock; |
| 4180 | } |
Damien Miller | 819dbb6 | 2009-01-21 16:46:26 +1100 | [diff] [blame] | 4181 | } |
| 4182 | #endif |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 4183 | /* |
| 4184 | * Check if it is a unix domain socket. Unix domain displays are in |
| 4185 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] |
| 4186 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4187 | if (strncmp(display, "unix:", 5) == 0 || |
| 4188 | display[0] == ':') { |
| 4189 | /* Connect to the unix domain socket. */ |
Damien Miller | 57c4e87 | 2006-03-31 23:11:07 +1100 | [diff] [blame] | 4190 | if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4191 | error("Could not parse display number from DISPLAY: %.100s", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 4192 | display); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4193 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4194 | } |
| 4195 | /* Create a socket. */ |
| 4196 | sock = connect_local_xsocket(display_number); |
| 4197 | if (sock < 0) |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4198 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4199 | |
| 4200 | /* OK, we now have a connection to the display. */ |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4201 | return sock; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4202 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 4203 | /* |
| 4204 | * Connect to an inet socket. The DISPLAY value is supposedly |
| 4205 | * hostname:d[.s], where hostname may also be numeric IP address. |
| 4206 | */ |
Ben Lindstrom | ccd8d07 | 2001-12-07 17:26:48 +0000 | [diff] [blame] | 4207 | strlcpy(buf, display, sizeof(buf)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4208 | cp = strchr(buf, ':'); |
| 4209 | if (!cp) { |
| 4210 | error("Could not find ':' in DISPLAY: %.100s", display); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4211 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4212 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4213 | *cp = 0; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 4214 | /* 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] | 4215 | if (sscanf(cp + 1, "%u", &display_number) != 1) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4216 | error("Could not parse display number from DISPLAY: %.100s", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 4217 | display); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4218 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4219 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4220 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4221 | /* Look up the host address */ |
| 4222 | memset(&hints, 0, sizeof(hints)); |
| 4223 | hints.ai_family = IPv4or6; |
| 4224 | hints.ai_socktype = SOCK_STREAM; |
Damien Miller | 57c4e87 | 2006-03-31 23:11:07 +1100 | [diff] [blame] | 4225 | snprintf(strport, sizeof strport, "%u", 6000 + display_number); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4226 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
Darren Tucker | 4abde77 | 2007-12-29 02:43:51 +1100 | [diff] [blame] | 4227 | error("%.100s: unknown host. (%s)", buf, |
| 4228 | ssh_gai_strerror(gaierr)); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4229 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4230 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4231 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 4232 | /* Create a socket. */ |
Darren Tucker | 7bd98e7 | 2010-01-10 10:31:12 +1100 | [diff] [blame] | 4233 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4234 | if (sock < 0) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 4235 | debug2("socket: %.100s", strerror(errno)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 4236 | continue; |
| 4237 | } |
| 4238 | /* Connect it to the display. */ |
| 4239 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
Damien Miller | 57c4e87 | 2006-03-31 23:11:07 +1100 | [diff] [blame] | 4240 | debug2("connect %.100s port %u: %.100s", buf, |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 4241 | 6000 + display_number, strerror(errno)); |
| 4242 | close(sock); |
| 4243 | continue; |
| 4244 | } |
| 4245 | /* Success */ |
| 4246 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4247 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4248 | freeaddrinfo(aitop); |
| 4249 | if (!ai) { |
Damien Miller | 57c4e87 | 2006-03-31 23:11:07 +1100 | [diff] [blame] | 4250 | error("connect %.100s port %u: %.100s", buf, 6000 + display_number, |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 4251 | strerror(errno)); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4252 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4253 | } |
Damien Miller | 398e1cf | 2002-02-05 11:52:13 +1100 | [diff] [blame] | 4254 | set_nodelay(sock); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4255 | return sock; |
| 4256 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4257 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4258 | /* |
| 4259 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains |
| 4260 | * the remote channel number. We should do whatever we want, and respond |
| 4261 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. |
| 4262 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4263 | |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 4264 | /* ARGSUSED */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 4265 | int |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 4266 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4267 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 4268 | Channel *c = NULL; |
| 4269 | int remote_id, sock = 0; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4270 | char *remote_host; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4271 | |
| 4272 | debug("Received X11 open request."); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 4273 | |
| 4274 | remote_id = packet_get_int(); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 4275 | |
| 4276 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 4277 | remote_host = packet_get_string(NULL); |
| 4278 | } else { |
| 4279 | remote_host = xstrdup("unknown (remote did not supply name)"); |
| 4280 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 4281 | packet_check_eom(); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4282 | |
| 4283 | /* Obtain a connection to the real X display. */ |
| 4284 | sock = x11_connect_display(); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 4285 | if (sock != -1) { |
| 4286 | /* Allocate a channel for this connection. */ |
| 4287 | c = channel_new("connected x11 socket", |
| 4288 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, |
| 4289 | remote_host, 1); |
Damien Miller | 699d003 | 2002-02-08 22:07:16 +1100 | [diff] [blame] | 4290 | c->remote_id = remote_id; |
| 4291 | c->force_drain = 1; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 4292 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 4293 | free(remote_host); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 4294 | if (c == NULL) { |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4295 | /* Send refusal to the remote host. */ |
| 4296 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 4297 | packet_put_int(remote_id); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4298 | } else { |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4299 | /* Send a confirmation to the remote host. */ |
| 4300 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 4301 | packet_put_int(remote_id); |
| 4302 | packet_put_int(c->self); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4303 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 4304 | packet_send(); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 4305 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4306 | } |
| 4307 | |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 4308 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
Damien Miller | 8473dd8 | 2006-07-24 14:08:32 +1000 | [diff] [blame] | 4309 | /* ARGSUSED */ |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 4310 | int |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 4311 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 4312 | { |
| 4313 | int rchan = packet_get_int(); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 4314 | |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 4315 | switch (type) { |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 4316 | case SSH_SMSG_AGENT_OPEN: |
| 4317 | error("Warning: ssh server tried agent forwarding."); |
| 4318 | break; |
| 4319 | case SSH_SMSG_X11_OPEN: |
| 4320 | error("Warning: ssh server tried X11 forwarding."); |
| 4321 | break; |
| 4322 | default: |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 4323 | error("deny_input_open: type %d", type); |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 4324 | break; |
| 4325 | } |
Damien Miller | 5eb137c | 2005-12-31 16:19:53 +1100 | [diff] [blame] | 4326 | 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] | 4327 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 4328 | packet_put_int(rchan); |
| 4329 | packet_send(); |
markus@openbsd.org | 3fdc88a | 2015-01-19 20:07:45 +0000 | [diff] [blame] | 4330 | return 0; |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 4331 | } |
| 4332 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 4333 | /* |
| 4334 | * Requests forwarding of X11 connections, generates fake authentication |
| 4335 | * data, and enables authentication spoofing. |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 4336 | * This should be called in the client only. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 4337 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 4338 | void |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 4339 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
Damien Miller | 6d7b437 | 2011-06-23 08:31:57 +1000 | [diff] [blame] | 4340 | const char *proto, const char *data, int want_reply) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4341 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 4342 | u_int data_len = (u_int) strlen(data) / 2; |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 4343 | u_int i, value; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4344 | char *new_data; |
| 4345 | int screen_number; |
| 4346 | const char *cp; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4347 | |
Damien Miller | f92c079 | 2005-07-06 09:45:26 +1000 | [diff] [blame] | 4348 | if (x11_saved_display == NULL) |
| 4349 | x11_saved_display = xstrdup(disp); |
| 4350 | else if (strcmp(disp, x11_saved_display) != 0) { |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 4351 | error("x11_request_forwarding_with_spoofing: different " |
| 4352 | "$DISPLAY already forwarded"); |
| 4353 | return; |
| 4354 | } |
| 4355 | |
Damien Miller | d5fe0ba | 2006-08-30 11:07:39 +1000 | [diff] [blame] | 4356 | cp = strchr(disp, ':'); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4357 | if (cp) |
| 4358 | cp = strchr(cp, '.'); |
| 4359 | if (cp) |
Damien Miller | 08d6150 | 2006-03-26 14:28:32 +1100 | [diff] [blame] | 4360 | screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4361 | else |
| 4362 | screen_number = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4363 | |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 4364 | if (x11_saved_proto == NULL) { |
| 4365 | /* Save protocol name. */ |
| 4366 | x11_saved_proto = xstrdup(proto); |
natano@openbsd.org | 4927108 | 2016-09-19 07:52:42 +0000 | [diff] [blame] | 4367 | |
| 4368 | /* Extract real authentication data. */ |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 4369 | x11_saved_data = xmalloc(data_len); |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 4370 | for (i = 0; i < data_len; i++) { |
| 4371 | if (sscanf(data + 2 * i, "%2x", &value) != 1) |
| 4372 | fatal("x11_request_forwarding: bad " |
| 4373 | "authentication data: %.100s", data); |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 4374 | x11_saved_data[i] = value; |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 4375 | } |
| 4376 | x11_saved_data_len = data_len; |
natano@openbsd.org | 4927108 | 2016-09-19 07:52:42 +0000 | [diff] [blame] | 4377 | |
| 4378 | /* Generate fake data of the same length. */ |
| 4379 | x11_fake_data = xmalloc(data_len); |
| 4380 | arc4random_buf(x11_fake_data, data_len); |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 4381 | x11_fake_data_len = data_len; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4382 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4383 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4384 | /* Convert the fake data into hex. */ |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 4385 | new_data = tohex(x11_fake_data, data_len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4386 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4387 | /* Send the request packet. */ |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame^] | 4388 | channel_request_start(client_session_id, "x11-req", want_reply); |
| 4389 | packet_put_char(0); /* XXX bool single connection */ |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 4390 | packet_put_cstring(proto); |
| 4391 | packet_put_cstring(new_data); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4392 | packet_put_int(screen_number); |
| 4393 | packet_send(); |
| 4394 | packet_write_wait(); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 4395 | free(new_data); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4396 | } |
| 4397 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 4398 | |
| 4399 | /* -- agent forwarding */ |
| 4400 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4401 | /* Sends a message to the server to request authentication fd forwarding. */ |
| 4402 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 4403 | void |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 4404 | auth_request_forwarding(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4405 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4406 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
| 4407 | packet_send(); |
| 4408 | packet_write_wait(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 4409 | } |