Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 1 | /* |
| 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 4 | * All rights reserved |
| 5 | * |
| 6 | * As far as I am concerned, the code I have written for this software |
| 7 | * can be used freely for any purpose. Any derived versions of this |
| 8 | * software must be clearly marked as such, and if the derived work is |
| 9 | * incompatible with the protocol description in the RFC file, it must be |
| 10 | * called by a name other than "ssh" or "Secure Shell". |
| 11 | */ |
| 12 | /* |
| 13 | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
| 14 | * |
| 15 | * Redistribution and use in source and binary forms, with or without |
| 16 | * modification, are permitted provided that the following conditions |
| 17 | * are met: |
| 18 | * 1. Redistributions of source code must retain the above copyright |
| 19 | * notice, this list of conditions and the following disclaimer. |
| 20 | * 2. Redistributions in binary form must reproduce the above copyright |
| 21 | * notice, this list of conditions and the following disclaimer in the |
| 22 | * documentation and/or other materials provided with the distribution. |
| 23 | * |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 25 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 26 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 27 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 28 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 29 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 30 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 31 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 32 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 33 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 34 | */ |
Ben Lindstrom | 983c098 | 2001-06-09 01:20:06 +0000 | [diff] [blame] | 35 | /* RCSID("$OpenBSD: channels.h,v 1.37 2001/06/04 21:59:42 markus Exp $"); */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 36 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 37 | #ifndef CHANNEL_H |
| 38 | #define CHANNEL_H |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 39 | |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 40 | #include "buffer.h" |
| 41 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 42 | /* Definitions for channel types. */ |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 43 | #define SSH_CHANNEL_X11_LISTENER 1 /* Listening for inet X11 conn. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 44 | #define SSH_CHANNEL_PORT_LISTENER 2 /* Listening on a port. */ |
| 45 | #define SSH_CHANNEL_OPENING 3 /* waiting for confirmation */ |
| 46 | #define SSH_CHANNEL_OPEN 4 /* normal open two-way channel */ |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 47 | #define SSH_CHANNEL_CLOSED 5 /* waiting for close confirmation */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 48 | #define SSH_CHANNEL_AUTH_SOCKET 6 /* authentication socket */ |
| 49 | #define SSH_CHANNEL_X11_OPEN 7 /* reading first X11 packet */ |
| 50 | #define SSH_CHANNEL_INPUT_DRAINING 8 /* sending remaining data to conn */ |
| 51 | #define SSH_CHANNEL_OUTPUT_DRAINING 9 /* sending remaining data to app */ |
| 52 | #define SSH_CHANNEL_LARVAL 10 /* larval session */ |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 53 | #define SSH_CHANNEL_RPORT_LISTENER 11 /* Listening to a R-style port */ |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 54 | #define SSH_CHANNEL_CONNECTING 12 |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 55 | #define SSH_CHANNEL_DYNAMIC 13 |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 56 | #define SSH_CHANNEL_ZOMBIE 14 /* Almost dead. */ |
| 57 | #define SSH_CHANNEL_MAX_TYPE 15 |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 58 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 59 | #define SSH_CHANNEL_PATH_LEN 30 |
| 60 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 61 | /* |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 62 | * Data structure for channel data. This is initialized in channel_new |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 63 | * and cleared in channel_free. |
| 64 | */ |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 65 | struct Channel; |
| 66 | typedef struct Channel Channel; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 67 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 68 | typedef void channel_callback_fn(int id, void *arg); |
| 69 | typedef int channel_filter_fn(struct Channel *c, char *buf, int len); |
| 70 | |
| 71 | struct Channel { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 72 | int type; /* channel type/state */ |
| 73 | int self; /* my own channel identifier */ |
| 74 | int remote_id; /* channel identifier for remote peer */ |
| 75 | /* peer can be reached over encrypted connection, via packet-sent */ |
| 76 | int istate; /* input from channel (state of receive half) */ |
| 77 | int ostate; /* output to channel (state of transmit half) */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 78 | int flags; /* close sent/rcvd */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 79 | int rfd; /* read fd */ |
| 80 | int wfd; /* write fd */ |
| 81 | int efd; /* extended fd */ |
| 82 | int sock; /* sock fd */ |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 83 | int isatty; /* rfd is a tty */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 84 | Buffer input; /* data read from socket, to be sent over |
| 85 | * encrypted connection */ |
| 86 | Buffer output; /* data received over encrypted connection for |
| 87 | * send on socket */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 88 | Buffer extended; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 89 | char path[SSH_CHANNEL_PATH_LEN]; |
| 90 | /* path for unix domain sockets, or host name for forwards */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 91 | int listening_port; /* port being listened for forwards */ |
| 92 | int host_port; /* remote port to connect for forwards */ |
| 93 | char *remote_name; /* remote hostname */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 94 | |
| 95 | int remote_window; |
| 96 | int remote_maxpacket; |
| 97 | int local_window; |
| 98 | int local_window_max; |
| 99 | int local_consumed; |
| 100 | int local_maxpacket; |
| 101 | int extended_usage; |
| 102 | |
| 103 | char *ctype; /* type */ |
| 104 | |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 105 | /* callback */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 106 | channel_callback_fn *cb_fn; |
| 107 | void *cb_arg; |
| 108 | int cb_event; |
| 109 | channel_callback_fn *dettach_user; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 110 | |
| 111 | /* filter */ |
| 112 | channel_filter_fn *input_filter; |
| 113 | }; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 114 | |
| 115 | #define CHAN_EXTENDED_IGNORE 0 |
| 116 | #define CHAN_EXTENDED_READ 1 |
| 117 | #define CHAN_EXTENDED_WRITE 2 |
| 118 | |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 119 | /* default window/packet sizes for tcp/x11-fwd-channel */ |
| 120 | #define CHAN_SES_WINDOW_DEFAULT (32*1024) |
| 121 | #define CHAN_SES_PACKET_DEFAULT (CHAN_SES_WINDOW_DEFAULT/2) |
| 122 | #define CHAN_TCP_WINDOW_DEFAULT (32*1024) |
| 123 | #define CHAN_TCP_PACKET_DEFAULT (CHAN_TCP_WINDOW_DEFAULT/2) |
| 124 | #define CHAN_X11_WINDOW_DEFAULT (4*1024) |
| 125 | #define CHAN_X11_PACKET_DEFAULT (CHAN_X11_WINDOW_DEFAULT/2) |
| 126 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 127 | /* possible input states */ |
| 128 | #define CHAN_INPUT_OPEN 0x01 |
| 129 | #define CHAN_INPUT_WAIT_DRAIN 0x02 |
| 130 | #define CHAN_INPUT_WAIT_OCLOSE 0x04 |
| 131 | #define CHAN_INPUT_CLOSED 0x08 |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 132 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 133 | /* possible output states */ |
| 134 | #define CHAN_OUTPUT_OPEN 0x10 |
| 135 | #define CHAN_OUTPUT_WAIT_DRAIN 0x20 |
| 136 | #define CHAN_OUTPUT_WAIT_IEOF 0x40 |
| 137 | #define CHAN_OUTPUT_CLOSED 0x80 |
| 138 | |
| 139 | #define CHAN_CLOSE_SENT 0x01 |
| 140 | #define CHAN_CLOSE_RCVD 0x02 |
| 141 | |
| 142 | |
| 143 | /* channel management */ |
| 144 | |
| 145 | Channel *channel_lookup(int id); |
| 146 | Channel * |
| 147 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
| 148 | int window, int maxpack, int extusage, char *remote_name, int nonblock); |
| 149 | void |
| 150 | channel_set_fds(int id, int rfd, int wfd, int efd, |
| 151 | int extusage, int nonblock); |
| 152 | void channel_free(Channel *c); |
| 153 | |
| 154 | void channel_send_open(int id); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 155 | void channel_request(int id, char *service, int wantconfirm); |
| 156 | void channel_request_start(int id, char *service, int wantconfirm); |
| 157 | void channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg); |
| 158 | void channel_register_cleanup(int id, channel_callback_fn *fn); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 159 | void channel_register_filter(int id, channel_filter_fn *fn); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 160 | void channel_cancel_cleanup(int id); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 161 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 162 | /* protocol handler */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 163 | |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 164 | void channel_input_channel_request(int type, int plen, void *ctxt); |
| 165 | void channel_input_close(int type, int plen, void *ctxt); |
| 166 | void channel_input_close_confirmation(int type, int plen, void *ctxt); |
| 167 | void channel_input_data(int type, int plen, void *ctxt); |
| 168 | void channel_input_extended_data(int type, int plen, void *ctxt); |
| 169 | void channel_input_ieof(int type, int plen, void *ctxt); |
| 170 | void channel_input_oclose(int type, int plen, void *ctxt); |
| 171 | void channel_input_open_confirmation(int type, int plen, void *ctxt); |
| 172 | void channel_input_open_failure(int type, int plen, void *ctxt); |
| 173 | void channel_input_port_open(int type, int plen, void *ctxt); |
| 174 | void channel_input_window_adjust(int type, int plen, void *ctxt); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 175 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 176 | /* file descriptor handling (read/write) */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 177 | |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 178 | void |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 179 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
| 180 | int rekeying); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 181 | void channel_after_select(fd_set * readset, fd_set * writeset); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 182 | void channel_output_poll(void); |
| 183 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 184 | int channel_not_very_much_buffered_data(void); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 185 | void channel_stop_listening(void); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 186 | void channel_close_all(void); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 187 | int channel_still_open(void); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 188 | char *channel_open_message(void); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 189 | int channel_find_open(void); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 190 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 191 | /* channel_tcpfwd.c */ |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 192 | int |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 193 | channel_request_local_forwarding(u_short listen_port, |
| 194 | const char *host_to_connect, u_short port_to_connect, int gateway_ports); |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 195 | int |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 196 | channel_request_forwarding(const char *listen_address, u_short listen_port, |
| 197 | const char *host_to_connect, u_short port_to_connect, int gateway_ports, |
| 198 | int remote_fwd); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 199 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 200 | channel_request_remote_forwarding(u_short port, const char *host, |
| 201 | u_short remote_port); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 202 | void channel_permit_all_opens(void); |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 203 | void channel_add_permitted_opens(char *host, int port); |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 204 | void channel_clear_permitted_opens(void); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 205 | void channel_input_port_forward_request(int is_root, int gateway_ports); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 206 | int channel_connect_to(const char *host, u_short host_port); |
| 207 | int channel_connect_by_listen_adress(u_short listen_port); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 208 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 209 | /* x11 forwarding */ |
| 210 | |
| 211 | int x11_connect_display(void); |
| 212 | //int x11_check_cookie(Buffer *b); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 213 | char *x11_create_display(int screen); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 214 | char *x11_create_display_inet(int screen, int x11_display_offset); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 215 | void x11_input_open(int type, int plen, void *ctxt); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 216 | void x11_request_forwarding(void); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 217 | void |
| 218 | x11_request_forwarding_with_spoofing(int client_session_id, |
| 219 | const char *proto, const char *data); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 220 | void deny_input_open(int type, int plen, void *ctxt); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 221 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 222 | /* agent forwarding */ |
| 223 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 224 | void auth_request_forwarding(void); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 225 | char *auth_get_socket_name(void); |
Ben Lindstrom | 983c098 | 2001-06-09 01:20:06 +0000 | [diff] [blame] | 226 | void auth_sock_cleanup_proc(void *pw); |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 227 | int auth_input_request_forwarding(struct passwd * pw); |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 228 | void auth_input_open_request(int type, int plen, void *ctxt); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 229 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 230 | /* channel close */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 231 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 232 | typedef void chan_event_fn(Channel * c); |
| 233 | |
| 234 | /* for the input state */ |
| 235 | extern chan_event_fn *chan_rcvd_oclose; |
| 236 | extern chan_event_fn *chan_read_failed; |
| 237 | extern chan_event_fn *chan_ibuf_empty; |
| 238 | |
| 239 | /* for the output state */ |
| 240 | extern chan_event_fn *chan_rcvd_ieof; |
| 241 | extern chan_event_fn *chan_write_failed; |
| 242 | extern chan_event_fn *chan_obuf_empty; |
| 243 | |
| 244 | int chan_is_dead(Channel * c); |
| 245 | void chan_mark_dead(Channel * c); |
| 246 | void chan_init_iostates(Channel * c); |
| 247 | void chan_init(void); |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 248 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 249 | #endif |