1d059297112922cabb0c674840589be8db821fd9aAdam Langley/* $OpenBSD: mux.c,v 1.50 2015/01/20 23:14:00 deraadt Exp $ */ 2bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* 3bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * Copyright (c) 2002-2008 Damien Miller <djm@openbsd.org> 4bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * 5bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * Permission to use, copy, modify, and distribute this software for any 6bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * purpose with or without fee is hereby granted, provided that the above 7bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * copyright notice and this permission notice appear in all copies. 8bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * 9bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman */ 17bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 18bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* ssh session multiplexing support */ 19bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 20bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* 21bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * TODO: 22bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * - Better signalling from master to slave, especially passing of 23bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * error messages 24bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * - Better fall-back from mux slave error to new connection. 25bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * - ExitOnForwardingFailure 26bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * - Maybe extension mechanisms for multi-X11/multi-agent forwarding 27bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * - Support ~^Z in mux slaves. 28bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * - Inspect or control sessions in master. 29bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * - If we ever support the "signal" channel request, send signals on 30bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * sessions in master. 31bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman */ 32bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 33bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include "includes.h" 34bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 35bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include <sys/types.h> 36bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include <sys/stat.h> 37bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include <sys/socket.h> 38bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include <sys/un.h> 39bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 40bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include <errno.h> 41bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include <fcntl.h> 42bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include <signal.h> 43bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include <stdarg.h> 44bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include <stddef.h> 45bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include <stdlib.h> 46bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include <stdio.h> 47bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include <string.h> 48bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include <unistd.h> 49bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#ifdef HAVE_PATHS_H 50bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include <paths.h> 51bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#endif 52bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 53bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#ifdef HAVE_POLL_H 54bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include <poll.h> 55bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#else 56bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman# ifdef HAVE_SYS_POLL_H 57bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman# include <sys/poll.h> 58bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman# endif 59bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#endif 60bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 61bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#ifdef HAVE_UTIL_H 62bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman# include <util.h> 63bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#endif 64bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 65bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include "openbsd-compat/sys-queue.h" 66bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include "xmalloc.h" 67bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include "log.h" 68bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include "ssh.h" 69bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include "ssh2.h" 70bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include "pathnames.h" 71bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include "misc.h" 72bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include "match.h" 73bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include "buffer.h" 74bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include "channels.h" 75bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include "msg.h" 76bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include "packet.h" 77bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include "monitor_fdpass.h" 78bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include "sshpty.h" 79bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include "key.h" 80bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include "readconf.h" 81bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include "clientloop.h" 82bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 83bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* from ssh.c */ 84bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanextern int tty_flag; 85bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanextern Options options; 86bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanextern int stdin_null_flag; 87bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanextern char *host; 88bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanextern int subsystem_flag; 89bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanextern Buffer command; 90bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanextern volatile sig_atomic_t quit_pending; 91bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanextern char *stdio_forward_host; 92bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanextern int stdio_forward_port; 93bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 94bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* Context for session open confirmation callback */ 95bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstruct mux_session_confirm_ctx { 96bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int want_tty; 97bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int want_subsys; 98bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int want_x_fwd; 99bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int want_agent_fwd; 100bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Buffer cmd; 101bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char *term; 102bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman struct termios tio; 103bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char **env; 104bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int rid; 105bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman}; 106bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 107d059297112922cabb0c674840589be8db821fd9aAdam Langley/* Context for stdio fwd open confirmation callback */ 108d059297112922cabb0c674840589be8db821fd9aAdam Langleystruct mux_stdio_confirm_ctx { 109d059297112922cabb0c674840589be8db821fd9aAdam Langley u_int rid; 110d059297112922cabb0c674840589be8db821fd9aAdam Langley}; 111d059297112922cabb0c674840589be8db821fd9aAdam Langley 112bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* Context for global channel callback */ 113bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstruct mux_channel_confirm_ctx { 114bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int cid; /* channel id */ 115bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int rid; /* request id */ 116bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman int fid; /* forward id */ 117bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman}; 118bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 119bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* fd to control socket */ 120bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanint muxserver_sock = -1; 121bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 122bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* client request id */ 123bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanu_int muxclient_request_id = 0; 124bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 125bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* Multiplexing control command */ 126bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanu_int muxclient_command = 0; 127bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 128bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* Set when signalled. */ 129bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic volatile sig_atomic_t muxclient_terminate = 0; 130bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 131bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* PID of multiplex server */ 132bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic u_int muxserver_pid = 0; 133bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 134bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic Channel *mux_listener_channel = NULL; 135bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 136bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstruct mux_master_state { 137bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman int hello_rcvd; 138bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman}; 139bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 140bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* mux protocol messages */ 141bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#define MUX_MSG_HELLO 0x00000001 142bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#define MUX_C_NEW_SESSION 0x10000002 143bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#define MUX_C_ALIVE_CHECK 0x10000004 144bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#define MUX_C_TERMINATE 0x10000005 145bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#define MUX_C_OPEN_FWD 0x10000006 146bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#define MUX_C_CLOSE_FWD 0x10000007 147bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#define MUX_C_NEW_STDIO_FWD 0x10000008 148bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#define MUX_C_STOP_LISTENING 0x10000009 149bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#define MUX_S_OK 0x80000001 150bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#define MUX_S_PERMISSION_DENIED 0x80000002 151bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#define MUX_S_FAILURE 0x80000003 152bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#define MUX_S_EXIT_MESSAGE 0x80000004 153bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#define MUX_S_ALIVE 0x80000005 154bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#define MUX_S_SESSION_OPENED 0x80000006 155bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#define MUX_S_REMOTE_PORT 0x80000007 156bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#define MUX_S_TTY_ALLOC_FAIL 0x80000008 157bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 158bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* type codes for MUX_C_OPEN_FWD and MUX_C_CLOSE_FWD */ 159bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#define MUX_FWD_LOCAL 1 160bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#define MUX_FWD_REMOTE 2 161bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#define MUX_FWD_DYNAMIC 3 162bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 163bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic void mux_session_confirm(int, int, void *); 164d059297112922cabb0c674840589be8db821fd9aAdam Langleystatic void mux_stdio_confirm(int, int, void *); 165bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 166bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int process_mux_master_hello(u_int, Channel *, Buffer *, Buffer *); 167bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int process_mux_new_session(u_int, Channel *, Buffer *, Buffer *); 168bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int process_mux_alive_check(u_int, Channel *, Buffer *, Buffer *); 169bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int process_mux_terminate(u_int, Channel *, Buffer *, Buffer *); 170bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int process_mux_open_fwd(u_int, Channel *, Buffer *, Buffer *); 171bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int process_mux_close_fwd(u_int, Channel *, Buffer *, Buffer *); 172bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int process_mux_stdio_fwd(u_int, Channel *, Buffer *, Buffer *); 173bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int process_mux_stop_listening(u_int, Channel *, Buffer *, Buffer *); 174bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 175bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic const struct { 176bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int type; 177bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman int (*handler)(u_int, Channel *, Buffer *, Buffer *); 178bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} mux_master_handlers[] = { 179bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman { MUX_MSG_HELLO, process_mux_master_hello }, 180bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman { MUX_C_NEW_SESSION, process_mux_new_session }, 181bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman { MUX_C_ALIVE_CHECK, process_mux_alive_check }, 182bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman { MUX_C_TERMINATE, process_mux_terminate }, 183bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman { MUX_C_OPEN_FWD, process_mux_open_fwd }, 184bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman { MUX_C_CLOSE_FWD, process_mux_close_fwd }, 185bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman { MUX_C_NEW_STDIO_FWD, process_mux_stdio_fwd }, 186bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman { MUX_C_STOP_LISTENING, process_mux_stop_listening }, 187bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman { 0, NULL } 188bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman}; 189bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 190bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* Cleanup callback fired on closure of mux slave _session_ channel */ 191bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* ARGSUSED */ 192bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic void 193bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanmux_master_session_cleanup_cb(int cid, void *unused) 194bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 195bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Channel *cc, *c = channel_by_id(cid); 196bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 197bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug3("%s: entering for channel %d", __func__, cid); 198bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (c == NULL) 199bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: channel_by_id(%i) == NULL", __func__, cid); 200bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (c->ctl_chan != -1) { 201bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((cc = channel_by_id(c->ctl_chan)) == NULL) 202bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: channel %d missing control channel %d", 203bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, c->self, c->ctl_chan); 204bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman c->ctl_chan = -1; 205bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman cc->remote_id = -1; 206bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman chan_rcvd_oclose(cc); 207bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 208bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman channel_cancel_cleanup(c->self); 209bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 210bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 211bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* Cleanup callback fired on closure of mux slave _control_ channel */ 212bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* ARGSUSED */ 213bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic void 214bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanmux_master_control_cleanup_cb(int cid, void *unused) 215bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 216bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Channel *sc, *c = channel_by_id(cid); 217bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 218bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug3("%s: entering for channel %d", __func__, cid); 219bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (c == NULL) 220bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: channel_by_id(%i) == NULL", __func__, cid); 221bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (c->remote_id != -1) { 222bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((sc = channel_by_id(c->remote_id)) == NULL) 223bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: channel %d missing session channel %d", 224bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, c->self, c->remote_id); 225bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman c->remote_id = -1; 226bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman sc->ctl_chan = -1; 227d059297112922cabb0c674840589be8db821fd9aAdam Langley if (sc->type != SSH_CHANNEL_OPEN && 228d059297112922cabb0c674840589be8db821fd9aAdam Langley sc->type != SSH_CHANNEL_OPENING) { 229bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("%s: channel %d: not open", __func__, sc->self); 230bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman chan_mark_dead(sc); 231bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } else { 232bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (sc->istate == CHAN_INPUT_OPEN) 233bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman chan_read_failed(sc); 234bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (sc->ostate == CHAN_OUTPUT_OPEN) 235bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman chan_write_failed(sc); 236bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 237bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 238bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman channel_cancel_cleanup(c->self); 239bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 240bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 241bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* Check mux client environment variables before passing them to mux master. */ 242bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int 243bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanenv_permitted(char *env) 244bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 245bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman int i, ret; 246bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char name[1024], *cp; 247bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 248bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((cp = strchr(env, '=')) == NULL || cp == env) 249bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 250bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman ret = snprintf(name, sizeof(name), "%.*s", (int)(cp - env), env); 251bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (ret <= 0 || (size_t)ret >= sizeof(name)) { 252bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("env_permitted: name '%.100s...' too long", env); 253bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 254bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 255bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 256bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman for (i = 0; i < options.num_send_env; i++) 257bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (match_pattern(name, options.send_env[i])) 258bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 1; 259bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 260bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 261bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 262bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 263bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* Mux master protocol message handlers */ 264bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 265bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int 266bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanprocess_mux_master_hello(u_int rid, Channel *c, Buffer *m, Buffer *r) 267bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 268bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int ver; 269bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman struct mux_master_state *state = (struct mux_master_state *)c->mux_ctx; 270bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 271bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (state == NULL) 272bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: channel %d: c->mux_ctx == NULL", __func__, c->self); 273bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (state->hello_rcvd) { 274bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: HELLO received twice", __func__); 275bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 276bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 277bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (buffer_get_int_ret(&ver, m) != 0) { 278bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman malf: 279bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: malformed message", __func__); 280bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 281bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 282bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (ver != SSHMUX_VER) { 283bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("Unsupported multiplexing protocol version %d " 284bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman "(expected %d)", ver, SSHMUX_VER); 285bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 286bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 287bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("%s: channel %d slave version %u", __func__, c->self, ver); 288bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 289bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* No extensions are presently defined */ 290bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman while (buffer_len(m) > 0) { 291bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char *name = buffer_get_string_ret(m, NULL); 292bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char *value = buffer_get_string_ret(m, NULL); 293bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 294bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (name == NULL || value == NULL) { 295d059297112922cabb0c674840589be8db821fd9aAdam Langley free(name); 296d059297112922cabb0c674840589be8db821fd9aAdam Langley free(value); 297bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto malf; 298bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 299bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("Unrecognised slave extension \"%s\"", name); 300d059297112922cabb0c674840589be8db821fd9aAdam Langley free(name); 301d059297112922cabb0c674840589be8db821fd9aAdam Langley free(value); 302bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 303bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman state->hello_rcvd = 1; 304bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 305bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 306bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 307bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int 308bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanprocess_mux_new_session(u_int rid, Channel *c, Buffer *m, Buffer *r) 309bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 310bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Channel *nc; 311bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman struct mux_session_confirm_ctx *cctx; 312bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char *reserved, *cmd, *cp; 313bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int i, j, len, env_len, escape_char, window, packetmax; 314bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman int new_fd[3]; 315bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 316bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Reply for SSHMUX_COMMAND_OPEN */ 317bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman cctx = xcalloc(1, sizeof(*cctx)); 318bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman cctx->term = NULL; 319bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman cctx->rid = rid; 320bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman cmd = reserved = NULL; 321d059297112922cabb0c674840589be8db821fd9aAdam Langley cctx->env = NULL; 322d059297112922cabb0c674840589be8db821fd9aAdam Langley env_len = 0; 323bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((reserved = buffer_get_string_ret(m, NULL)) == NULL || 324bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_get_int_ret(&cctx->want_tty, m) != 0 || 325bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_get_int_ret(&cctx->want_x_fwd, m) != 0 || 326bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_get_int_ret(&cctx->want_agent_fwd, m) != 0 || 327bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_get_int_ret(&cctx->want_subsys, m) != 0 || 328bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_get_int_ret(&escape_char, m) != 0 || 329bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman (cctx->term = buffer_get_string_ret(m, &len)) == NULL || 330bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman (cmd = buffer_get_string_ret(m, &len)) == NULL) { 331bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman malf: 332d059297112922cabb0c674840589be8db821fd9aAdam Langley free(cmd); 333d059297112922cabb0c674840589be8db821fd9aAdam Langley free(reserved); 334d059297112922cabb0c674840589be8db821fd9aAdam Langley for (j = 0; j < env_len; j++) 335d059297112922cabb0c674840589be8db821fd9aAdam Langley free(cctx->env[j]); 336d059297112922cabb0c674840589be8db821fd9aAdam Langley free(cctx->env); 337d059297112922cabb0c674840589be8db821fd9aAdam Langley free(cctx->term); 338d059297112922cabb0c674840589be8db821fd9aAdam Langley free(cctx); 339bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: malformed message", __func__); 340bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 341bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 342d059297112922cabb0c674840589be8db821fd9aAdam Langley free(reserved); 343bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman reserved = NULL; 344bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 345bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman while (buffer_len(m) > 0) { 346bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#define MUX_MAX_ENV_VARS 4096 347d059297112922cabb0c674840589be8db821fd9aAdam Langley if ((cp = buffer_get_string_ret(m, &len)) == NULL) 348bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto malf; 349bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (!env_permitted(cp)) { 350d059297112922cabb0c674840589be8db821fd9aAdam Langley free(cp); 351bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman continue; 352bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 353bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman cctx->env = xrealloc(cctx->env, env_len + 2, 354bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman sizeof(*cctx->env)); 355bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman cctx->env[env_len++] = cp; 356bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman cctx->env[env_len] = NULL; 357bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (env_len > MUX_MAX_ENV_VARS) { 358bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error(">%d environment variables received, ignoring " 359bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman "additional", MUX_MAX_ENV_VARS); 360bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman break; 361bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 362bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 363bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 364bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("%s: channel %d: request tty %d, X %d, agent %d, subsys %d, " 365bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman "term \"%s\", cmd \"%s\", env %u", __func__, c->self, 366bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman cctx->want_tty, cctx->want_x_fwd, cctx->want_agent_fwd, 367bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman cctx->want_subsys, cctx->term, cmd, env_len); 368bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 369bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_init(&cctx->cmd); 370bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_append(&cctx->cmd, cmd, strlen(cmd)); 371d059297112922cabb0c674840589be8db821fd9aAdam Langley free(cmd); 372bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman cmd = NULL; 373bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 374bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Gather fds from client */ 375bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman for(i = 0; i < 3; i++) { 376bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((new_fd[i] = mm_receive_fd(c->sock)) == -1) { 377bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: failed to receive fd %d from slave", 378bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, i); 379bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman for (j = 0; j < i; j++) 380bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman close(new_fd[j]); 381bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman for (j = 0; j < env_len; j++) 382d059297112922cabb0c674840589be8db821fd9aAdam Langley free(cctx->env[j]); 383d059297112922cabb0c674840589be8db821fd9aAdam Langley free(cctx->env); 384d059297112922cabb0c674840589be8db821fd9aAdam Langley free(cctx->term); 385bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&cctx->cmd); 386d059297112922cabb0c674840589be8db821fd9aAdam Langley free(cctx); 387bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 388bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* prepare reply */ 389bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, MUX_S_FAILURE); 390bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, rid); 391bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_cstring(r, 392bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman "did not receive file descriptors"); 393bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 394bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 395bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 396bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 397bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug3("%s: got fds stdin %d, stdout %d, stderr %d", __func__, 398bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman new_fd[0], new_fd[1], new_fd[2]); 399bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 400bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* XXX support multiple child sessions in future */ 401bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (c->remote_id != -1) { 402bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("%s: session already open", __func__); 403bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* prepare reply */ 404bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, MUX_S_FAILURE); 405bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, rid); 406bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_cstring(r, "Multiple sessions not supported"); 407bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman cleanup: 408bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman close(new_fd[0]); 409bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman close(new_fd[1]); 410bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman close(new_fd[2]); 411d059297112922cabb0c674840589be8db821fd9aAdam Langley free(cctx->term); 412bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (env_len != 0) { 413bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman for (i = 0; i < env_len; i++) 414d059297112922cabb0c674840589be8db821fd9aAdam Langley free(cctx->env[i]); 415d059297112922cabb0c674840589be8db821fd9aAdam Langley free(cctx->env); 416bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 417bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&cctx->cmd); 418d059297112922cabb0c674840589be8db821fd9aAdam Langley free(cctx); 419bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 420bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 421bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 422bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (options.control_master == SSHCTL_MASTER_ASK || 423bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.control_master == SSHCTL_MASTER_AUTO_ASK) { 424bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (!ask_permission("Allow shared connection to %s? ", host)) { 425bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("%s: session refused by user", __func__); 426bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* prepare reply */ 427bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, MUX_S_PERMISSION_DENIED); 428bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, rid); 429bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_cstring(r, "Permission denied"); 430bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto cleanup; 431bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 432bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 433bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 434bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Try to pick up ttymodes from client before it goes raw */ 435bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1) 436bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: tcgetattr: %s", __func__, strerror(errno)); 437bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 438bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* enable nonblocking unless tty */ 439bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (!isatty(new_fd[0])) 440bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman set_nonblock(new_fd[0]); 441bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (!isatty(new_fd[1])) 442bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman set_nonblock(new_fd[1]); 443bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (!isatty(new_fd[2])) 444bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman set_nonblock(new_fd[2]); 445bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 446bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman window = CHAN_SES_WINDOW_DEFAULT; 447bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman packetmax = CHAN_SES_PACKET_DEFAULT; 448bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (cctx->want_tty) { 449bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman window >>= 1; 450bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman packetmax >>= 1; 451bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 452bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 453bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman nc = channel_new("session", SSH_CHANNEL_OPENING, 454bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman new_fd[0], new_fd[1], new_fd[2], window, packetmax, 455bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0); 456bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 457bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman nc->ctl_chan = c->self; /* link session -> control channel */ 458bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman c->remote_id = nc->self; /* link control -> session channel */ 459bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 460bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (cctx->want_tty && escape_char != 0xffffffff) { 461bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman channel_register_filter(nc->self, 462bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman client_simple_escape_filter, NULL, 463bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman client_filter_cleanup, 464bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman client_new_escape_filter_ctx((int)escape_char)); 465bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 466bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 467bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("%s: channel_new: %d linked to control channel %d", 468bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, nc->self, nc->ctl_chan); 469bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 470bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman channel_send_open(nc->self); 471bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman channel_register_open_confirm(nc->self, mux_session_confirm, cctx); 472bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman c->mux_pause = 1; /* stop handling messages until open_confirm done */ 473bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman channel_register_cleanup(nc->self, mux_master_session_cleanup_cb, 1); 474bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 475bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* reply is deferred, sent by mux_session_confirm */ 476bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 477bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 478bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 479bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int 480bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanprocess_mux_alive_check(u_int rid, Channel *c, Buffer *m, Buffer *r) 481bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 482bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("%s: channel %d: alive check", __func__, c->self); 483bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 484bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* prepare reply */ 485bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, MUX_S_ALIVE); 486bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, rid); 487bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, (u_int)getpid()); 488bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 489bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 490bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 491bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 492bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int 493bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanprocess_mux_terminate(u_int rid, Channel *c, Buffer *m, Buffer *r) 494bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 495bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("%s: channel %d: terminate request", __func__, c->self); 496bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 497bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (options.control_master == SSHCTL_MASTER_ASK || 498bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.control_master == SSHCTL_MASTER_AUTO_ASK) { 499bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (!ask_permission("Terminate shared connection to %s? ", 500bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman host)) { 501bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("%s: termination refused by user", __func__); 502bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, MUX_S_PERMISSION_DENIED); 503bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, rid); 504bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_cstring(r, "Permission denied"); 505bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 506bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 507bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 508bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 509bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman quit_pending = 1; 510bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, MUX_S_OK); 511bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, rid); 512bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* XXX exit happens too soon - message never makes it to client */ 513bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 514bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 515bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 516bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic char * 517d059297112922cabb0c674840589be8db821fd9aAdam Langleyformat_forward(u_int ftype, struct Forward *fwd) 518bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 519bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char *ret; 520bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 521bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman switch (ftype) { 522bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_FWD_LOCAL: 523bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman xasprintf(&ret, "local forward %.200s:%d -> %.200s:%d", 524d059297112922cabb0c674840589be8db821fd9aAdam Langley (fwd->listen_path != NULL) ? fwd->listen_path : 525bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman (fwd->listen_host == NULL) ? 526d059297112922cabb0c674840589be8db821fd9aAdam Langley (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") : 527bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fwd->listen_host, fwd->listen_port, 528d059297112922cabb0c674840589be8db821fd9aAdam Langley (fwd->connect_path != NULL) ? fwd->connect_path : 529bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fwd->connect_host, fwd->connect_port); 530bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman break; 531bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_FWD_DYNAMIC: 532bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman xasprintf(&ret, "dynamic forward %.200s:%d -> *", 533bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman (fwd->listen_host == NULL) ? 534d059297112922cabb0c674840589be8db821fd9aAdam Langley (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") : 535bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fwd->listen_host, fwd->listen_port); 536bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman break; 537bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_FWD_REMOTE: 538bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman xasprintf(&ret, "remote forward %.200s:%d -> %.200s:%d", 539d059297112922cabb0c674840589be8db821fd9aAdam Langley (fwd->listen_path != NULL) ? fwd->listen_path : 540bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman (fwd->listen_host == NULL) ? 541bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman "LOCALHOST" : fwd->listen_host, 542bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fwd->listen_port, 543d059297112922cabb0c674840589be8db821fd9aAdam Langley (fwd->connect_path != NULL) ? fwd->connect_path : 544bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fwd->connect_host, fwd->connect_port); 545bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman break; 546bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman default: 547bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: unknown forward type %u", __func__, ftype); 548bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 549bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return ret; 550bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 551bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 552bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int 553bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmancompare_host(const char *a, const char *b) 554bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 555bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (a == NULL && b == NULL) 556bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 1; 557bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (a == NULL || b == NULL) 558bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 559bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return strcmp(a, b) == 0; 560bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 561bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 562bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int 563d059297112922cabb0c674840589be8db821fd9aAdam Langleycompare_forward(struct Forward *a, struct Forward *b) 564bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 565bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (!compare_host(a->listen_host, b->listen_host)) 566bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 567d059297112922cabb0c674840589be8db821fd9aAdam Langley if (!compare_host(a->listen_path, b->listen_path)) 568d059297112922cabb0c674840589be8db821fd9aAdam Langley return 0; 569bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (a->listen_port != b->listen_port) 570bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 571bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (!compare_host(a->connect_host, b->connect_host)) 572bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 573d059297112922cabb0c674840589be8db821fd9aAdam Langley if (!compare_host(a->connect_path, b->connect_path)) 574d059297112922cabb0c674840589be8db821fd9aAdam Langley return 0; 575bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (a->connect_port != b->connect_port) 576bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 577bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 578bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 1; 579bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 580bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 581bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic void 582bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanmux_confirm_remote_forward(int type, u_int32_t seq, void *ctxt) 583bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 584bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman struct mux_channel_confirm_ctx *fctx = ctxt; 585bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char *failmsg = NULL; 586d059297112922cabb0c674840589be8db821fd9aAdam Langley struct Forward *rfwd; 587bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Channel *c; 588bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Buffer out; 589bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 590bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((c = channel_by_id(fctx->cid)) == NULL) { 591bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* no channel for reply */ 592bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: unknown channel", __func__); 593bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return; 594bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 595bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_init(&out); 596bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (fctx->fid >= options.num_remote_forwards) { 597bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman xasprintf(&failmsg, "unknown forwarding id %d", fctx->fid); 598bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto fail; 599bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 600bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman rfwd = &options.remote_forwards[fctx->fid]; 601bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug("%s: %s for: listen %d, connect %s:%d", __func__, 602bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure", 603d059297112922cabb0c674840589be8db821fd9aAdam Langley rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path : 604d059297112922cabb0c674840589be8db821fd9aAdam Langley rfwd->connect_host, rfwd->connect_port); 605bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (type == SSH2_MSG_REQUEST_SUCCESS) { 606bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (rfwd->listen_port == 0) { 607bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman rfwd->allocated_port = packet_get_int(); 608bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman logit("Allocated port %u for mux remote forward" 609bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman " to %s:%d", rfwd->allocated_port, 610bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman rfwd->connect_host, rfwd->connect_port); 611bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&out, MUX_S_REMOTE_PORT); 612bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&out, fctx->rid); 613bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&out, rfwd->allocated_port); 614d059297112922cabb0c674840589be8db821fd9aAdam Langley channel_update_permitted_opens(rfwd->handle, 615d059297112922cabb0c674840589be8db821fd9aAdam Langley rfwd->allocated_port); 616bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } else { 617bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&out, MUX_S_OK); 618bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&out, fctx->rid); 619bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 620bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto out; 621bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } else { 622d059297112922cabb0c674840589be8db821fd9aAdam Langley if (rfwd->listen_port == 0) 623d059297112922cabb0c674840589be8db821fd9aAdam Langley channel_update_permitted_opens(rfwd->handle, -1); 624d059297112922cabb0c674840589be8db821fd9aAdam Langley if (rfwd->listen_path != NULL) 625d059297112922cabb0c674840589be8db821fd9aAdam Langley xasprintf(&failmsg, "remote port forwarding failed for " 626d059297112922cabb0c674840589be8db821fd9aAdam Langley "listen path %s", rfwd->listen_path); 627d059297112922cabb0c674840589be8db821fd9aAdam Langley else 628d059297112922cabb0c674840589be8db821fd9aAdam Langley xasprintf(&failmsg, "remote port forwarding failed for " 629d059297112922cabb0c674840589be8db821fd9aAdam Langley "listen port %d", rfwd->listen_port); 630bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 631bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fail: 632bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: %s", __func__, failmsg); 633bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&out, MUX_S_FAILURE); 634bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&out, fctx->rid); 635bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_cstring(&out, failmsg); 636d059297112922cabb0c674840589be8db821fd9aAdam Langley free(failmsg); 637bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman out: 638bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_string(&c->output, buffer_ptr(&out), buffer_len(&out)); 639bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&out); 640bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (c->mux_pause <= 0) 641bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: mux_pause %d", __func__, c->mux_pause); 642bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman c->mux_pause = 0; /* start processing messages again */ 643bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 644bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 645bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int 646bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanprocess_mux_open_fwd(u_int rid, Channel *c, Buffer *m, Buffer *r) 647bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 648d059297112922cabb0c674840589be8db821fd9aAdam Langley struct Forward fwd; 649bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char *fwd_desc = NULL; 650d059297112922cabb0c674840589be8db821fd9aAdam Langley char *listen_addr, *connect_addr; 651bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int ftype; 652d059297112922cabb0c674840589be8db821fd9aAdam Langley u_int lport, cport; 653bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman int i, ret = 0, freefwd = 1; 654bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 655d059297112922cabb0c674840589be8db821fd9aAdam Langley /* XXX - lport/cport check redundant */ 656bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (buffer_get_int_ret(&ftype, m) != 0 || 657d059297112922cabb0c674840589be8db821fd9aAdam Langley (listen_addr = buffer_get_string_ret(m, NULL)) == NULL || 658d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_get_int_ret(&lport, m) != 0 || 659d059297112922cabb0c674840589be8db821fd9aAdam Langley (connect_addr = buffer_get_string_ret(m, NULL)) == NULL || 660d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_get_int_ret(&cport, m) != 0 || 661d059297112922cabb0c674840589be8db821fd9aAdam Langley (lport != (u_int)PORT_STREAMLOCAL && lport > 65535) || 662d059297112922cabb0c674840589be8db821fd9aAdam Langley (cport != (u_int)PORT_STREAMLOCAL && cport > 65535)) { 663bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: malformed message", __func__); 664bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman ret = -1; 665bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto out; 666bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 667d059297112922cabb0c674840589be8db821fd9aAdam Langley if (*listen_addr == '\0') { 668d059297112922cabb0c674840589be8db821fd9aAdam Langley free(listen_addr); 669d059297112922cabb0c674840589be8db821fd9aAdam Langley listen_addr = NULL; 670bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 671d059297112922cabb0c674840589be8db821fd9aAdam Langley if (*connect_addr == '\0') { 672d059297112922cabb0c674840589be8db821fd9aAdam Langley free(connect_addr); 673d059297112922cabb0c674840589be8db821fd9aAdam Langley connect_addr = NULL; 674bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 675bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 676d059297112922cabb0c674840589be8db821fd9aAdam Langley memset(&fwd, 0, sizeof(fwd)); 677d059297112922cabb0c674840589be8db821fd9aAdam Langley fwd.listen_port = lport; 678d059297112922cabb0c674840589be8db821fd9aAdam Langley if (fwd.listen_port == PORT_STREAMLOCAL) 679d059297112922cabb0c674840589be8db821fd9aAdam Langley fwd.listen_path = listen_addr; 680d059297112922cabb0c674840589be8db821fd9aAdam Langley else 681d059297112922cabb0c674840589be8db821fd9aAdam Langley fwd.listen_host = listen_addr; 682d059297112922cabb0c674840589be8db821fd9aAdam Langley fwd.connect_port = cport; 683d059297112922cabb0c674840589be8db821fd9aAdam Langley if (fwd.connect_port == PORT_STREAMLOCAL) 684d059297112922cabb0c674840589be8db821fd9aAdam Langley fwd.connect_path = connect_addr; 685d059297112922cabb0c674840589be8db821fd9aAdam Langley else 686d059297112922cabb0c674840589be8db821fd9aAdam Langley fwd.connect_host = connect_addr; 687d059297112922cabb0c674840589be8db821fd9aAdam Langley 688bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("%s: channel %d: request %s", __func__, c->self, 689bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman (fwd_desc = format_forward(ftype, &fwd))); 690bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 691bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (ftype != MUX_FWD_LOCAL && ftype != MUX_FWD_REMOTE && 692bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman ftype != MUX_FWD_DYNAMIC) { 693bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman logit("%s: invalid forwarding type %u", __func__, ftype); 694bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman invalid: 695d059297112922cabb0c674840589be8db821fd9aAdam Langley free(listen_addr); 696d059297112922cabb0c674840589be8db821fd9aAdam Langley free(connect_addr); 697bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, MUX_S_FAILURE); 698bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, rid); 699bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_cstring(r, "Invalid forwarding request"); 700bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 701bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 702d059297112922cabb0c674840589be8db821fd9aAdam Langley if (ftype == MUX_FWD_DYNAMIC && fwd.listen_path) { 703d059297112922cabb0c674840589be8db821fd9aAdam Langley logit("%s: streamlocal and dynamic forwards " 704d059297112922cabb0c674840589be8db821fd9aAdam Langley "are mutually exclusive", __func__); 705d059297112922cabb0c674840589be8db821fd9aAdam Langley goto invalid; 706d059297112922cabb0c674840589be8db821fd9aAdam Langley } 707d059297112922cabb0c674840589be8db821fd9aAdam Langley if (fwd.listen_port != PORT_STREAMLOCAL && fwd.listen_port >= 65536) { 708bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman logit("%s: invalid listen port %u", __func__, 709bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fwd.listen_port); 710bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto invalid; 711bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 712d059297112922cabb0c674840589be8db821fd9aAdam Langley if ((fwd.connect_port != PORT_STREAMLOCAL && fwd.connect_port >= 65536) 713d059297112922cabb0c674840589be8db821fd9aAdam Langley || (ftype != MUX_FWD_DYNAMIC && ftype != MUX_FWD_REMOTE && fwd.connect_port == 0)) { 714bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman logit("%s: invalid connect port %u", __func__, 715bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fwd.connect_port); 716bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto invalid; 717bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 718d059297112922cabb0c674840589be8db821fd9aAdam Langley if (ftype != MUX_FWD_DYNAMIC && fwd.connect_host == NULL && fwd.connect_path == NULL) { 719bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman logit("%s: missing connect host", __func__); 720bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto invalid; 721bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 722bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 723bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Skip forwards that have already been requested */ 724bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman switch (ftype) { 725bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_FWD_LOCAL: 726bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_FWD_DYNAMIC: 727bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman for (i = 0; i < options.num_local_forwards; i++) { 728bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (compare_forward(&fwd, 729bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.local_forwards + i)) { 730bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman exists: 731bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("%s: found existing forwarding", 732bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__); 733bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, MUX_S_OK); 734bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, rid); 735bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto out; 736bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 737bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 738bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman break; 739bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_FWD_REMOTE: 740bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman for (i = 0; i < options.num_remote_forwards; i++) { 741bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (compare_forward(&fwd, 742bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.remote_forwards + i)) { 743bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (fwd.listen_port != 0) 744bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto exists; 745bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("%s: found allocated port", 746bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__); 747bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, MUX_S_REMOTE_PORT); 748bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, rid); 749bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, 750bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.remote_forwards[i].allocated_port); 751bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto out; 752bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 753bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 754bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman break; 755bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 756bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 757bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (options.control_master == SSHCTL_MASTER_ASK || 758bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.control_master == SSHCTL_MASTER_AUTO_ASK) { 759bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (!ask_permission("Open %s on %s?", fwd_desc, host)) { 760bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("%s: forwarding refused by user", __func__); 761bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, MUX_S_PERMISSION_DENIED); 762bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, rid); 763bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_cstring(r, "Permission denied"); 764bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto out; 765bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 766bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 767bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 768bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (ftype == MUX_FWD_LOCAL || ftype == MUX_FWD_DYNAMIC) { 769d059297112922cabb0c674840589be8db821fd9aAdam Langley if (!channel_setup_local_fwd_listener(&fwd, 770d059297112922cabb0c674840589be8db821fd9aAdam Langley &options.fwd_opts)) { 771bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fail: 772bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman logit("slave-requested %s failed", fwd_desc); 773bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, MUX_S_FAILURE); 774bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, rid); 775bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_cstring(r, "Port forwarding failed"); 776bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto out; 777bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 778bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman add_local_forward(&options, &fwd); 779bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman freefwd = 0; 780bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } else { 781bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman struct mux_channel_confirm_ctx *fctx; 782bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 783d059297112922cabb0c674840589be8db821fd9aAdam Langley fwd.handle = channel_request_remote_forwarding(&fwd); 784d059297112922cabb0c674840589be8db821fd9aAdam Langley if (fwd.handle < 0) 785bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto fail; 786bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman add_remote_forward(&options, &fwd); 787bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fctx = xcalloc(1, sizeof(*fctx)); 788bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fctx->cid = c->self; 789bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fctx->rid = rid; 790bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fctx->fid = options.num_remote_forwards - 1; 791bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman client_register_global_confirm(mux_confirm_remote_forward, 792bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fctx); 793bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman freefwd = 0; 794bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman c->mux_pause = 1; /* wait for mux_confirm_remote_forward */ 795bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* delayed reply in mux_confirm_remote_forward */ 796bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto out; 797bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 798bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, MUX_S_OK); 799bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, rid); 800bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman out: 801d059297112922cabb0c674840589be8db821fd9aAdam Langley free(fwd_desc); 802bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (freefwd) { 803d059297112922cabb0c674840589be8db821fd9aAdam Langley free(fwd.listen_host); 804d059297112922cabb0c674840589be8db821fd9aAdam Langley free(fwd.listen_path); 805d059297112922cabb0c674840589be8db821fd9aAdam Langley free(fwd.connect_host); 806d059297112922cabb0c674840589be8db821fd9aAdam Langley free(fwd.connect_path); 807bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 808bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return ret; 809bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 810bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 811bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int 812bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanprocess_mux_close_fwd(u_int rid, Channel *c, Buffer *m, Buffer *r) 813bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 814d059297112922cabb0c674840589be8db821fd9aAdam Langley struct Forward fwd, *found_fwd; 815bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char *fwd_desc = NULL; 816d059297112922cabb0c674840589be8db821fd9aAdam Langley const char *error_reason = NULL; 817d059297112922cabb0c674840589be8db821fd9aAdam Langley char *listen_addr = NULL, *connect_addr = NULL; 818bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int ftype; 819d059297112922cabb0c674840589be8db821fd9aAdam Langley int i, ret = 0; 820d059297112922cabb0c674840589be8db821fd9aAdam Langley u_int lport, cport; 821bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 822bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (buffer_get_int_ret(&ftype, m) != 0 || 823d059297112922cabb0c674840589be8db821fd9aAdam Langley (listen_addr = buffer_get_string_ret(m, NULL)) == NULL || 824d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_get_int_ret(&lport, m) != 0 || 825d059297112922cabb0c674840589be8db821fd9aAdam Langley (connect_addr = buffer_get_string_ret(m, NULL)) == NULL || 826d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_get_int_ret(&cport, m) != 0 || 827d059297112922cabb0c674840589be8db821fd9aAdam Langley (lport != (u_int)PORT_STREAMLOCAL && lport > 65535) || 828d059297112922cabb0c674840589be8db821fd9aAdam Langley (cport != (u_int)PORT_STREAMLOCAL && cport > 65535)) { 829bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: malformed message", __func__); 830bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman ret = -1; 831bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto out; 832bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 833bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 834d059297112922cabb0c674840589be8db821fd9aAdam Langley if (*listen_addr == '\0') { 835d059297112922cabb0c674840589be8db821fd9aAdam Langley free(listen_addr); 836d059297112922cabb0c674840589be8db821fd9aAdam Langley listen_addr = NULL; 837bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 838d059297112922cabb0c674840589be8db821fd9aAdam Langley if (*connect_addr == '\0') { 839d059297112922cabb0c674840589be8db821fd9aAdam Langley free(connect_addr); 840d059297112922cabb0c674840589be8db821fd9aAdam Langley connect_addr = NULL; 841bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 842bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 843d059297112922cabb0c674840589be8db821fd9aAdam Langley memset(&fwd, 0, sizeof(fwd)); 844d059297112922cabb0c674840589be8db821fd9aAdam Langley fwd.listen_port = lport; 845d059297112922cabb0c674840589be8db821fd9aAdam Langley if (fwd.listen_port == PORT_STREAMLOCAL) 846d059297112922cabb0c674840589be8db821fd9aAdam Langley fwd.listen_path = listen_addr; 847d059297112922cabb0c674840589be8db821fd9aAdam Langley else 848d059297112922cabb0c674840589be8db821fd9aAdam Langley fwd.listen_host = listen_addr; 849d059297112922cabb0c674840589be8db821fd9aAdam Langley fwd.connect_port = cport; 850d059297112922cabb0c674840589be8db821fd9aAdam Langley if (fwd.connect_port == PORT_STREAMLOCAL) 851d059297112922cabb0c674840589be8db821fd9aAdam Langley fwd.connect_path = connect_addr; 852d059297112922cabb0c674840589be8db821fd9aAdam Langley else 853d059297112922cabb0c674840589be8db821fd9aAdam Langley fwd.connect_host = connect_addr; 854d059297112922cabb0c674840589be8db821fd9aAdam Langley 855d059297112922cabb0c674840589be8db821fd9aAdam Langley debug2("%s: channel %d: request cancel %s", __func__, c->self, 856bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman (fwd_desc = format_forward(ftype, &fwd))); 857bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 858d059297112922cabb0c674840589be8db821fd9aAdam Langley /* make sure this has been requested */ 859d059297112922cabb0c674840589be8db821fd9aAdam Langley found_fwd = NULL; 860d059297112922cabb0c674840589be8db821fd9aAdam Langley switch (ftype) { 861d059297112922cabb0c674840589be8db821fd9aAdam Langley case MUX_FWD_LOCAL: 862d059297112922cabb0c674840589be8db821fd9aAdam Langley case MUX_FWD_DYNAMIC: 863d059297112922cabb0c674840589be8db821fd9aAdam Langley for (i = 0; i < options.num_local_forwards; i++) { 864d059297112922cabb0c674840589be8db821fd9aAdam Langley if (compare_forward(&fwd, 865d059297112922cabb0c674840589be8db821fd9aAdam Langley options.local_forwards + i)) { 866d059297112922cabb0c674840589be8db821fd9aAdam Langley found_fwd = options.local_forwards + i; 867d059297112922cabb0c674840589be8db821fd9aAdam Langley break; 868d059297112922cabb0c674840589be8db821fd9aAdam Langley } 869d059297112922cabb0c674840589be8db821fd9aAdam Langley } 870d059297112922cabb0c674840589be8db821fd9aAdam Langley break; 871d059297112922cabb0c674840589be8db821fd9aAdam Langley case MUX_FWD_REMOTE: 872d059297112922cabb0c674840589be8db821fd9aAdam Langley for (i = 0; i < options.num_remote_forwards; i++) { 873d059297112922cabb0c674840589be8db821fd9aAdam Langley if (compare_forward(&fwd, 874d059297112922cabb0c674840589be8db821fd9aAdam Langley options.remote_forwards + i)) { 875d059297112922cabb0c674840589be8db821fd9aAdam Langley found_fwd = options.remote_forwards + i; 876d059297112922cabb0c674840589be8db821fd9aAdam Langley break; 877d059297112922cabb0c674840589be8db821fd9aAdam Langley } 878d059297112922cabb0c674840589be8db821fd9aAdam Langley } 879d059297112922cabb0c674840589be8db821fd9aAdam Langley break; 880d059297112922cabb0c674840589be8db821fd9aAdam Langley } 881bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 882d059297112922cabb0c674840589be8db821fd9aAdam Langley if (found_fwd == NULL) 883d059297112922cabb0c674840589be8db821fd9aAdam Langley error_reason = "port not forwarded"; 884d059297112922cabb0c674840589be8db821fd9aAdam Langley else if (ftype == MUX_FWD_REMOTE) { 885d059297112922cabb0c674840589be8db821fd9aAdam Langley /* 886d059297112922cabb0c674840589be8db821fd9aAdam Langley * This shouldn't fail unless we confused the host/port 887d059297112922cabb0c674840589be8db821fd9aAdam Langley * between options.remote_forwards and permitted_opens. 888d059297112922cabb0c674840589be8db821fd9aAdam Langley * However, for dynamic allocated listen ports we need 889d059297112922cabb0c674840589be8db821fd9aAdam Langley * to use the actual listen port. 890d059297112922cabb0c674840589be8db821fd9aAdam Langley */ 891d059297112922cabb0c674840589be8db821fd9aAdam Langley if (channel_request_rforward_cancel(found_fwd) == -1) 892d059297112922cabb0c674840589be8db821fd9aAdam Langley error_reason = "port not in permitted opens"; 893d059297112922cabb0c674840589be8db821fd9aAdam Langley } else { /* local and dynamic forwards */ 894d059297112922cabb0c674840589be8db821fd9aAdam Langley /* Ditto */ 895d059297112922cabb0c674840589be8db821fd9aAdam Langley if (channel_cancel_lport_listener(&fwd, fwd.connect_port, 896d059297112922cabb0c674840589be8db821fd9aAdam Langley &options.fwd_opts) == -1) 897d059297112922cabb0c674840589be8db821fd9aAdam Langley error_reason = "port not found"; 898d059297112922cabb0c674840589be8db821fd9aAdam Langley } 899d059297112922cabb0c674840589be8db821fd9aAdam Langley 900d059297112922cabb0c674840589be8db821fd9aAdam Langley if (error_reason == NULL) { 901d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_put_int(r, MUX_S_OK); 902d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_put_int(r, rid); 903d059297112922cabb0c674840589be8db821fd9aAdam Langley 904d059297112922cabb0c674840589be8db821fd9aAdam Langley free(found_fwd->listen_host); 905d059297112922cabb0c674840589be8db821fd9aAdam Langley free(found_fwd->listen_path); 906d059297112922cabb0c674840589be8db821fd9aAdam Langley free(found_fwd->connect_host); 907d059297112922cabb0c674840589be8db821fd9aAdam Langley free(found_fwd->connect_path); 908d059297112922cabb0c674840589be8db821fd9aAdam Langley found_fwd->listen_host = found_fwd->connect_host = NULL; 909d059297112922cabb0c674840589be8db821fd9aAdam Langley found_fwd->listen_path = found_fwd->connect_path = NULL; 910d059297112922cabb0c674840589be8db821fd9aAdam Langley found_fwd->listen_port = found_fwd->connect_port = 0; 911d059297112922cabb0c674840589be8db821fd9aAdam Langley } else { 912d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_put_int(r, MUX_S_FAILURE); 913d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_put_int(r, rid); 914d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_put_cstring(r, error_reason); 915d059297112922cabb0c674840589be8db821fd9aAdam Langley } 916bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman out: 917d059297112922cabb0c674840589be8db821fd9aAdam Langley free(fwd_desc); 918d059297112922cabb0c674840589be8db821fd9aAdam Langley free(listen_addr); 919d059297112922cabb0c674840589be8db821fd9aAdam Langley free(connect_addr); 920bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 921bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return ret; 922bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 923bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 924bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int 925bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanprocess_mux_stdio_fwd(u_int rid, Channel *c, Buffer *m, Buffer *r) 926bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 927bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Channel *nc; 928bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char *reserved, *chost; 929bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int cport, i, j; 930bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman int new_fd[2]; 931d059297112922cabb0c674840589be8db821fd9aAdam Langley struct mux_stdio_confirm_ctx *cctx; 932bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 933bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman chost = reserved = NULL; 934bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((reserved = buffer_get_string_ret(m, NULL)) == NULL || 935bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman (chost = buffer_get_string_ret(m, NULL)) == NULL || 936bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_get_int_ret(&cport, m) != 0) { 937d059297112922cabb0c674840589be8db821fd9aAdam Langley free(reserved); 938d059297112922cabb0c674840589be8db821fd9aAdam Langley free(chost); 939bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: malformed message", __func__); 940bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 941bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 942d059297112922cabb0c674840589be8db821fd9aAdam Langley free(reserved); 943bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 944bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("%s: channel %d: request stdio fwd to %s:%u", 945bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, c->self, chost, cport); 946bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 947bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Gather fds from client */ 948bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman for(i = 0; i < 2; i++) { 949bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((new_fd[i] = mm_receive_fd(c->sock)) == -1) { 950bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: failed to receive fd %d from slave", 951bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, i); 952bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman for (j = 0; j < i; j++) 953bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman close(new_fd[j]); 954d059297112922cabb0c674840589be8db821fd9aAdam Langley free(chost); 955bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 956bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* prepare reply */ 957bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, MUX_S_FAILURE); 958bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, rid); 959bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_cstring(r, 960bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman "did not receive file descriptors"); 961bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 962bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 963bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 964bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 965bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug3("%s: got fds stdin %d, stdout %d", __func__, 966bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman new_fd[0], new_fd[1]); 967bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 968bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* XXX support multiple child sessions in future */ 969bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (c->remote_id != -1) { 970bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("%s: session already open", __func__); 971bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* prepare reply */ 972bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, MUX_S_FAILURE); 973bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, rid); 974bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_cstring(r, "Multiple sessions not supported"); 975bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman cleanup: 976bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman close(new_fd[0]); 977bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman close(new_fd[1]); 978d059297112922cabb0c674840589be8db821fd9aAdam Langley free(chost); 979bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 980bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 981bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 982bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (options.control_master == SSHCTL_MASTER_ASK || 983bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.control_master == SSHCTL_MASTER_AUTO_ASK) { 984bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (!ask_permission("Allow forward to %s:%u? ", 985bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman chost, cport)) { 986bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("%s: stdio fwd refused by user", __func__); 987bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* prepare reply */ 988bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, MUX_S_PERMISSION_DENIED); 989bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, rid); 990bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_cstring(r, "Permission denied"); 991bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto cleanup; 992bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 993bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 994bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 995bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* enable nonblocking unless tty */ 996bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (!isatty(new_fd[0])) 997bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman set_nonblock(new_fd[0]); 998bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (!isatty(new_fd[1])) 999bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman set_nonblock(new_fd[1]); 1000bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1001bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman nc = channel_connect_stdio_fwd(chost, cport, new_fd[0], new_fd[1]); 1002bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1003bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman nc->ctl_chan = c->self; /* link session -> control channel */ 1004bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman c->remote_id = nc->self; /* link control -> session channel */ 1005bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1006bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("%s: channel_new: %d linked to control channel %d", 1007bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, nc->self, nc->ctl_chan); 1008bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1009bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman channel_register_cleanup(nc->self, mux_master_session_cleanup_cb, 1); 1010bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1011d059297112922cabb0c674840589be8db821fd9aAdam Langley cctx = xcalloc(1, sizeof(*cctx)); 1012d059297112922cabb0c674840589be8db821fd9aAdam Langley cctx->rid = rid; 1013d059297112922cabb0c674840589be8db821fd9aAdam Langley channel_register_open_confirm(nc->self, mux_stdio_confirm, cctx); 1014d059297112922cabb0c674840589be8db821fd9aAdam Langley c->mux_pause = 1; /* stop handling messages until open_confirm done */ 1015bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1016d059297112922cabb0c674840589be8db821fd9aAdam Langley /* reply is deferred, sent by mux_session_confirm */ 1017bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 1018bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 1019bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1020d059297112922cabb0c674840589be8db821fd9aAdam Langley/* Callback on open confirmation in mux master for a mux stdio fwd session. */ 1021d059297112922cabb0c674840589be8db821fd9aAdam Langleystatic void 1022d059297112922cabb0c674840589be8db821fd9aAdam Langleymux_stdio_confirm(int id, int success, void *arg) 1023d059297112922cabb0c674840589be8db821fd9aAdam Langley{ 1024d059297112922cabb0c674840589be8db821fd9aAdam Langley struct mux_stdio_confirm_ctx *cctx = arg; 1025d059297112922cabb0c674840589be8db821fd9aAdam Langley Channel *c, *cc; 1026d059297112922cabb0c674840589be8db821fd9aAdam Langley Buffer reply; 1027d059297112922cabb0c674840589be8db821fd9aAdam Langley 1028d059297112922cabb0c674840589be8db821fd9aAdam Langley if (cctx == NULL) 1029d059297112922cabb0c674840589be8db821fd9aAdam Langley fatal("%s: cctx == NULL", __func__); 1030d059297112922cabb0c674840589be8db821fd9aAdam Langley if ((c = channel_by_id(id)) == NULL) 1031d059297112922cabb0c674840589be8db821fd9aAdam Langley fatal("%s: no channel for id %d", __func__, id); 1032d059297112922cabb0c674840589be8db821fd9aAdam Langley if ((cc = channel_by_id(c->ctl_chan)) == NULL) 1033d059297112922cabb0c674840589be8db821fd9aAdam Langley fatal("%s: channel %d lacks control channel %d", __func__, 1034d059297112922cabb0c674840589be8db821fd9aAdam Langley id, c->ctl_chan); 1035d059297112922cabb0c674840589be8db821fd9aAdam Langley 1036d059297112922cabb0c674840589be8db821fd9aAdam Langley if (!success) { 1037d059297112922cabb0c674840589be8db821fd9aAdam Langley debug3("%s: sending failure reply", __func__); 1038d059297112922cabb0c674840589be8db821fd9aAdam Langley /* prepare reply */ 1039d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_init(&reply); 1040d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_put_int(&reply, MUX_S_FAILURE); 1041d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_put_int(&reply, cctx->rid); 1042d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_put_cstring(&reply, "Session open refused by peer"); 1043d059297112922cabb0c674840589be8db821fd9aAdam Langley goto done; 1044d059297112922cabb0c674840589be8db821fd9aAdam Langley } 1045d059297112922cabb0c674840589be8db821fd9aAdam Langley 1046d059297112922cabb0c674840589be8db821fd9aAdam Langley debug3("%s: sending success reply", __func__); 1047d059297112922cabb0c674840589be8db821fd9aAdam Langley /* prepare reply */ 1048d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_init(&reply); 1049d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_put_int(&reply, MUX_S_SESSION_OPENED); 1050d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_put_int(&reply, cctx->rid); 1051d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_put_int(&reply, c->self); 1052d059297112922cabb0c674840589be8db821fd9aAdam Langley 1053d059297112922cabb0c674840589be8db821fd9aAdam Langley done: 1054d059297112922cabb0c674840589be8db821fd9aAdam Langley /* Send reply */ 1055d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_put_string(&cc->output, buffer_ptr(&reply), buffer_len(&reply)); 1056d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_free(&reply); 1057d059297112922cabb0c674840589be8db821fd9aAdam Langley 1058d059297112922cabb0c674840589be8db821fd9aAdam Langley if (cc->mux_pause <= 0) 1059d059297112922cabb0c674840589be8db821fd9aAdam Langley fatal("%s: mux_pause %d", __func__, cc->mux_pause); 1060d059297112922cabb0c674840589be8db821fd9aAdam Langley cc->mux_pause = 0; /* start processing messages again */ 1061d059297112922cabb0c674840589be8db821fd9aAdam Langley c->open_confirm_ctx = NULL; 1062d059297112922cabb0c674840589be8db821fd9aAdam Langley free(cctx); 1063d059297112922cabb0c674840589be8db821fd9aAdam Langley} 1064d059297112922cabb0c674840589be8db821fd9aAdam Langley 1065bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int 1066bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanprocess_mux_stop_listening(u_int rid, Channel *c, Buffer *m, Buffer *r) 1067bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 1068bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug("%s: channel %d: stop listening", __func__, c->self); 1069bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1070bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (options.control_master == SSHCTL_MASTER_ASK || 1071bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.control_master == SSHCTL_MASTER_AUTO_ASK) { 1072bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (!ask_permission("Disable further multiplexing on shared " 1073bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman "connection to %s? ", host)) { 1074bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("%s: stop listen refused by user", __func__); 1075bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, MUX_S_PERMISSION_DENIED); 1076bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, rid); 1077bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_cstring(r, "Permission denied"); 1078bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 1079bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1080bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1081bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1082bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_listener_channel != NULL) { 1083bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman channel_free(mux_listener_channel); 1084bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman client_stop_mux(); 1085d059297112922cabb0c674840589be8db821fd9aAdam Langley free(options.control_path); 1086bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.control_path = NULL; 1087bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman mux_listener_channel = NULL; 1088bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman muxserver_sock = -1; 1089bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1090bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1091bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* prepare reply */ 1092bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, MUX_S_OK); 1093bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(r, rid); 1094bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1095bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 1096bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 1097bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1098bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* Channel callbacks fired on read/write from mux slave fd */ 1099bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int 1100bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanmux_master_read_cb(Channel *c) 1101bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 1102bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman struct mux_master_state *state = (struct mux_master_state *)c->mux_ctx; 1103bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Buffer in, out; 1104d059297112922cabb0c674840589be8db821fd9aAdam Langley const u_char *ptr; 1105bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int type, rid, have, i; 1106bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman int ret = -1; 1107bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1108bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Setup ctx and */ 1109bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (c->mux_ctx == NULL) { 1110bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman state = xcalloc(1, sizeof(*state)); 1111bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman c->mux_ctx = state; 1112bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman channel_register_cleanup(c->self, 1113bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman mux_master_control_cleanup_cb, 0); 1114bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1115bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Send hello */ 1116bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_init(&out); 1117bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&out, MUX_MSG_HELLO); 1118bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&out, SSHMUX_VER); 1119bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* no extensions */ 1120bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_string(&c->output, buffer_ptr(&out), 1121bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_len(&out)); 1122bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&out); 1123bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug3("%s: channel %d: hello sent", __func__, c->self); 1124bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 1125bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1126bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1127bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_init(&in); 1128bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_init(&out); 1129bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1130bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Channel code ensures that we receive whole packets */ 1131bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((ptr = buffer_get_string_ptr_ret(&c->input, &have)) == NULL) { 1132bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman malf: 1133bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: malformed message", __func__); 1134bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto out; 1135bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1136bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_append(&in, ptr, have); 1137bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1138bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (buffer_get_int_ret(&type, &in) != 0) 1139bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto malf; 1140bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug3("%s: channel %d packet type 0x%08x len %u", 1141bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, c->self, type, buffer_len(&in)); 1142bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1143bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (type == MUX_MSG_HELLO) 1144bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman rid = 0; 1145bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman else { 1146bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (!state->hello_rcvd) { 1147bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: expected MUX_MSG_HELLO(0x%08x), " 1148bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman "received 0x%08x", __func__, MUX_MSG_HELLO, type); 1149bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto out; 1150bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1151bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (buffer_get_int_ret(&rid, &in) != 0) 1152bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto malf; 1153bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1154bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1155bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman for (i = 0; mux_master_handlers[i].handler != NULL; i++) { 1156bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (type == mux_master_handlers[i].type) { 1157bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman ret = mux_master_handlers[i].handler(rid, c, &in, &out); 1158bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman break; 1159bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1160bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1161bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_master_handlers[i].handler == NULL) { 1162bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: unsupported mux message 0x%08x", __func__, type); 1163bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&out, MUX_S_FAILURE); 1164bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&out, rid); 1165bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_cstring(&out, "unsupported request"); 1166bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman ret = 0; 1167bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1168bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Enqueue reply packet */ 1169bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (buffer_len(&out) != 0) { 1170bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_string(&c->output, buffer_ptr(&out), 1171bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_len(&out)); 1172bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1173bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman out: 1174bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&in); 1175bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&out); 1176bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return ret; 1177bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 1178bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1179bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanvoid 1180bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanmux_exit_message(Channel *c, int exitval) 1181bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 1182bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Buffer m; 1183bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Channel *mux_chan; 1184bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1185d059297112922cabb0c674840589be8db821fd9aAdam Langley debug3("%s: channel %d: exit message, exitval %d", __func__, c->self, 1186bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman exitval); 1187bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1188bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((mux_chan = channel_by_id(c->ctl_chan)) == NULL) 1189bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: channel %d missing mux channel %d", 1190bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, c->self, c->ctl_chan); 1191bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1192bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Append exit message packet to control socket output queue */ 1193bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_init(&m); 1194bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, MUX_S_EXIT_MESSAGE); 1195bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, c->self); 1196bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, exitval); 1197bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1198bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_string(&mux_chan->output, buffer_ptr(&m), buffer_len(&m)); 1199bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 1200bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 1201bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1202bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanvoid 1203bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanmux_tty_alloc_failed(Channel *c) 1204bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 1205bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Buffer m; 1206bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Channel *mux_chan; 1207bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1208bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug3("%s: channel %d: TTY alloc failed", __func__, c->self); 1209bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1210bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((mux_chan = channel_by_id(c->ctl_chan)) == NULL) 1211bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: channel %d missing mux channel %d", 1212bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, c->self, c->ctl_chan); 1213bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1214bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Append exit message packet to control socket output queue */ 1215bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_init(&m); 1216bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, MUX_S_TTY_ALLOC_FAIL); 1217bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, c->self); 1218bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1219bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_string(&mux_chan->output, buffer_ptr(&m), buffer_len(&m)); 1220bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 1221bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 1222bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1223bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* Prepare a mux master to listen on a Unix domain socket. */ 1224bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanvoid 1225bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanmuxserver_listen(void) 1226bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 1227bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman mode_t old_umask; 1228bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char *orig_control_path = options.control_path; 1229bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char rbuf[16+1]; 1230bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int i, r; 1231d059297112922cabb0c674840589be8db821fd9aAdam Langley int oerrno; 1232bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1233bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (options.control_path == NULL || 1234bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.control_master == SSHCTL_MASTER_NO) 1235bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return; 1236bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1237bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug("setting up multiplex master socket"); 1238bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1239bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* 1240bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * Use a temporary path before listen so we can pseudo-atomically 1241bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * establish the listening socket in its final location to avoid 1242bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * other processes racing in between bind() and listen() and hitting 1243bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * an unready socket. 1244bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman */ 1245bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman for (i = 0; i < sizeof(rbuf) - 1; i++) { 1246bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman r = arc4random_uniform(26+26+10); 1247bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman rbuf[i] = (r < 26) ? 'a' + r : 1248bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman (r < 26*2) ? 'A' + r - 26 : 1249bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman '0' + r - 26 - 26; 1250bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1251bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman rbuf[sizeof(rbuf) - 1] = '\0'; 1252bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.control_path = NULL; 1253bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman xasprintf(&options.control_path, "%s.%s", orig_control_path, rbuf); 1254bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug3("%s: temporary control path %s", __func__, options.control_path); 1255bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1256bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman old_umask = umask(0177); 1257d059297112922cabb0c674840589be8db821fd9aAdam Langley muxserver_sock = unix_listener(options.control_path, 64, 0); 1258d059297112922cabb0c674840589be8db821fd9aAdam Langley oerrno = errno; 1259d059297112922cabb0c674840589be8db821fd9aAdam Langley umask(old_umask); 1260d059297112922cabb0c674840589be8db821fd9aAdam Langley if (muxserver_sock < 0) { 1261d059297112922cabb0c674840589be8db821fd9aAdam Langley if (oerrno == EINVAL || oerrno == EADDRINUSE) { 1262bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("ControlSocket %s already exists, " 1263bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman "disabling multiplexing", options.control_path); 1264bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman disable_mux_master: 1265bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (muxserver_sock != -1) { 1266bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman close(muxserver_sock); 1267bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman muxserver_sock = -1; 1268bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1269d059297112922cabb0c674840589be8db821fd9aAdam Langley free(orig_control_path); 1270d059297112922cabb0c674840589be8db821fd9aAdam Langley free(options.control_path); 1271bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.control_path = NULL; 1272bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.control_master = SSHCTL_MASTER_NO; 1273bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return; 1274d059297112922cabb0c674840589be8db821fd9aAdam Langley } else { 1275d059297112922cabb0c674840589be8db821fd9aAdam Langley /* unix_listener() logs the error */ 1276d059297112922cabb0c674840589be8db821fd9aAdam Langley cleanup_exit(255); 1277d059297112922cabb0c674840589be8db821fd9aAdam Langley } 1278bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1279bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1280bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Now atomically "move" the mux socket into position */ 1281bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (link(options.control_path, orig_control_path) != 0) { 1282bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (errno != EEXIST) { 1283bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: link mux listener %s => %s: %s", __func__, 1284bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.control_path, orig_control_path, 1285bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman strerror(errno)); 1286bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1287bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("ControlSocket %s already exists, disabling multiplexing", 1288bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman orig_control_path); 1289bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman unlink(options.control_path); 1290bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto disable_mux_master; 1291bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1292bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman unlink(options.control_path); 1293d059297112922cabb0c674840589be8db821fd9aAdam Langley free(options.control_path); 1294bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.control_path = orig_control_path; 1295bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1296bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman set_nonblock(muxserver_sock); 1297bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1298bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman mux_listener_channel = channel_new("mux listener", 1299bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman SSH_CHANNEL_MUX_LISTENER, muxserver_sock, muxserver_sock, -1, 1300bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 1301bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 0, options.control_path, 1); 1302bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman mux_listener_channel->mux_rcb = mux_master_read_cb; 1303bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug3("%s: mux listener channel %d fd %d", __func__, 1304bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman mux_listener_channel->self, mux_listener_channel->sock); 1305bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 1306bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1307bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* Callback on open confirmation in mux master for a mux client session. */ 1308bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic void 1309bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanmux_session_confirm(int id, int success, void *arg) 1310bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 1311bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman struct mux_session_confirm_ctx *cctx = arg; 1312bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman const char *display; 1313bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Channel *c, *cc; 1314bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman int i; 1315bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Buffer reply; 1316bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1317bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (cctx == NULL) 1318bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: cctx == NULL", __func__); 1319bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((c = channel_by_id(id)) == NULL) 1320bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: no channel for id %d", __func__, id); 1321bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((cc = channel_by_id(c->ctl_chan)) == NULL) 1322bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: channel %d lacks control channel %d", __func__, 1323bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman id, c->ctl_chan); 1324bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1325bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (!success) { 1326bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug3("%s: sending failure reply", __func__); 1327bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* prepare reply */ 1328bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_init(&reply); 1329bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&reply, MUX_S_FAILURE); 1330bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&reply, cctx->rid); 1331bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_cstring(&reply, "Session open refused by peer"); 1332bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman goto done; 1333bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1334bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1335bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman display = getenv("DISPLAY"); 1336bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (cctx->want_x_fwd && options.forward_x11 && display != NULL) { 1337bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char *proto, *data; 1338bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1339bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Get reasonable local authentication information. */ 1340bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman client_x11_get_proto(display, options.xauth_location, 1341bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.forward_x11_trusted, options.forward_x11_timeout, 1342bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman &proto, &data); 1343bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Request forwarding with authentication spoofing. */ 1344bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug("Requesting X11 forwarding with authentication " 1345bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman "spoofing."); 1346bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman x11_request_forwarding_with_spoofing(id, display, proto, 1347bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman data, 1); 1348bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman client_expect_confirm(id, "X11 forwarding", CONFIRM_WARN); 1349bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* XXX exit_on_forward_failure */ 1350bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1351bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1352bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (cctx->want_agent_fwd && options.forward_agent) { 1353bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug("Requesting authentication agent forwarding."); 1354bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman channel_request_start(id, "auth-agent-req@openssh.com", 0); 1355bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman packet_send(); 1356bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1357bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1358bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman client_session2_setup(id, cctx->want_tty, cctx->want_subsys, 1359bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env); 1360bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1361bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug3("%s: sending success reply", __func__); 1362bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* prepare reply */ 1363bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_init(&reply); 1364bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&reply, MUX_S_SESSION_OPENED); 1365bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&reply, cctx->rid); 1366bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&reply, c->self); 1367bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1368bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman done: 1369bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Send reply */ 1370bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_string(&cc->output, buffer_ptr(&reply), buffer_len(&reply)); 1371bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&reply); 1372bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1373bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (cc->mux_pause <= 0) 1374bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: mux_pause %d", __func__, cc->mux_pause); 1375bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman cc->mux_pause = 0; /* start processing messages again */ 1376bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman c->open_confirm_ctx = NULL; 1377bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&cctx->cmd); 1378d059297112922cabb0c674840589be8db821fd9aAdam Langley free(cctx->term); 1379bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (cctx->env != NULL) { 1380bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman for (i = 0; cctx->env[i] != NULL; i++) 1381d059297112922cabb0c674840589be8db821fd9aAdam Langley free(cctx->env[i]); 1382d059297112922cabb0c674840589be8db821fd9aAdam Langley free(cctx->env); 1383bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1384d059297112922cabb0c674840589be8db821fd9aAdam Langley free(cctx); 1385bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 1386bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1387bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* ** Multiplexing client support */ 1388bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1389bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* Exit signal handler */ 1390bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic void 1391bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmancontrol_client_sighandler(int signo) 1392bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 1393bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman muxclient_terminate = signo; 1394bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 1395bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1396bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* 1397bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * Relay signal handler - used to pass some signals from mux client to 1398bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * mux master. 1399bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman */ 1400bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic void 1401bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmancontrol_client_sigrelay(int signo) 1402bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 1403bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman int save_errno = errno; 1404bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1405bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (muxserver_pid > 1) 1406bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman kill(muxserver_pid, signo); 1407bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1408bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman errno = save_errno; 1409bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 1410bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1411bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int 1412bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanmux_client_read(int fd, Buffer *b, u_int need) 1413bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 1414bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int have; 1415bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman ssize_t len; 1416bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_char *p; 1417bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman struct pollfd pfd; 1418bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1419bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman pfd.fd = fd; 1420bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman pfd.events = POLLIN; 1421bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman p = buffer_append_space(b, need); 1422bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman for (have = 0; have < need; ) { 1423bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (muxclient_terminate) { 1424bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman errno = EINTR; 1425bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 1426bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1427bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman len = read(fd, p + have, need - have); 1428bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (len < 0) { 1429bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman switch (errno) { 1430bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#if defined(EWOULDBLOCK) && (EWOULDBLOCK != EAGAIN) 1431bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case EWOULDBLOCK: 1432bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#endif 1433bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case EAGAIN: 1434bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman (void)poll(&pfd, 1, -1); 1435bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* FALLTHROUGH */ 1436bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case EINTR: 1437bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman continue; 1438bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman default: 1439bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 1440bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1441bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1442bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (len == 0) { 1443bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman errno = EPIPE; 1444bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 1445bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1446bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman have += (u_int)len; 1447bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1448bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 1449bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 1450bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1451bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int 1452bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanmux_client_write_packet(int fd, Buffer *m) 1453bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 1454bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Buffer queue; 1455bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int have, need; 1456bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman int oerrno, len; 1457bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_char *ptr; 1458bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman struct pollfd pfd; 1459bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1460bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman pfd.fd = fd; 1461bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman pfd.events = POLLOUT; 1462bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_init(&queue); 1463bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_string(&queue, buffer_ptr(m), buffer_len(m)); 1464bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1465bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman need = buffer_len(&queue); 1466bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman ptr = buffer_ptr(&queue); 1467bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1468bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman for (have = 0; have < need; ) { 1469bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (muxclient_terminate) { 1470bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&queue); 1471bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman errno = EINTR; 1472bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 1473bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1474bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman len = write(fd, ptr + have, need - have); 1475bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (len < 0) { 1476bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman switch (errno) { 1477bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#if defined(EWOULDBLOCK) && (EWOULDBLOCK != EAGAIN) 1478bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case EWOULDBLOCK: 1479bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#endif 1480bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case EAGAIN: 1481bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman (void)poll(&pfd, 1, -1); 1482bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* FALLTHROUGH */ 1483bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case EINTR: 1484bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman continue; 1485bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman default: 1486bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman oerrno = errno; 1487bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&queue); 1488bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman errno = oerrno; 1489bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 1490bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1491bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1492bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (len == 0) { 1493bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&queue); 1494bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman errno = EPIPE; 1495bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 1496bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1497bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman have += (u_int)len; 1498bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1499bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&queue); 1500bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 1501bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 1502bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1503bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int 1504bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanmux_client_read_packet(int fd, Buffer *m) 1505bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 1506bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Buffer queue; 1507bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int need, have; 1508d059297112922cabb0c674840589be8db821fd9aAdam Langley const u_char *ptr; 1509bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman int oerrno; 1510bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1511bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_init(&queue); 1512bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_client_read(fd, &queue, 4) != 0) { 1513bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((oerrno = errno) == EPIPE) 1514d059297112922cabb0c674840589be8db821fd9aAdam Langley debug3("%s: read header failed: %s", __func__, 1515d059297112922cabb0c674840589be8db821fd9aAdam Langley strerror(errno)); 1516d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_free(&queue); 1517bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman errno = oerrno; 1518bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 1519bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1520bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman need = get_u32(buffer_ptr(&queue)); 1521bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_client_read(fd, &queue, need) != 0) { 1522bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman oerrno = errno; 1523bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug3("%s: read body failed: %s", __func__, strerror(errno)); 1524d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_free(&queue); 1525bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman errno = oerrno; 1526bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 1527bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1528bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman ptr = buffer_get_string_ptr(&queue, &have); 1529bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_append(m, ptr, have); 1530bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&queue); 1531bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 1532bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 1533bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1534bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int 1535bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanmux_client_hello_exchange(int fd) 1536bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 1537bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Buffer m; 1538bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int type, ver; 1539bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1540bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_init(&m); 1541bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, MUX_MSG_HELLO); 1542bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, SSHMUX_VER); 1543bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* no extensions */ 1544bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1545bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_client_write_packet(fd, &m) != 0) 1546bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: write packet: %s", __func__, strerror(errno)); 1547bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1548bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_clear(&m); 1549bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1550bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Read their HELLO */ 1551bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_client_read_packet(fd, &m) != 0) { 1552bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 1553bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 1554bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1555bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1556bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman type = buffer_get_int(&m); 1557bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (type != MUX_MSG_HELLO) 1558bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: expected HELLO (%u) received %u", 1559bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, MUX_MSG_HELLO, type); 1560bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman ver = buffer_get_int(&m); 1561bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (ver != SSHMUX_VER) 1562bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("Unsupported multiplexing protocol version %d " 1563bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman "(expected %d)", ver, SSHMUX_VER); 1564bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("%s: master version %u", __func__, ver); 1565bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* No extensions are presently defined */ 1566bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman while (buffer_len(&m) > 0) { 1567bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char *name = buffer_get_string(&m, NULL); 1568bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char *value = buffer_get_string(&m, NULL); 1569bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1570bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("Unrecognised master extension \"%s\"", name); 1571d059297112922cabb0c674840589be8db821fd9aAdam Langley free(name); 1572d059297112922cabb0c674840589be8db821fd9aAdam Langley free(value); 1573bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1574bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 1575bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 1576bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 1577bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1578bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic u_int 1579bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanmux_client_request_alive(int fd) 1580bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 1581bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Buffer m; 1582bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char *e; 1583bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int pid, type, rid; 1584bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1585bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug3("%s: entering", __func__); 1586bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1587bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_init(&m); 1588bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, MUX_C_ALIVE_CHECK); 1589bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, muxclient_request_id); 1590bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1591bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_client_write_packet(fd, &m) != 0) 1592bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: write packet: %s", __func__, strerror(errno)); 1593bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1594bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_clear(&m); 1595bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1596bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Read their reply */ 1597bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_client_read_packet(fd, &m) != 0) { 1598bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 1599bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 1600bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1601bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1602bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman type = buffer_get_int(&m); 1603bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (type != MUX_S_ALIVE) { 1604bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman e = buffer_get_string(&m, NULL); 1605bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: master returned error: %s", __func__, e); 1606bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1607bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1608bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((rid = buffer_get_int(&m)) != muxclient_request_id) 1609bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: out of sequence reply: my id %u theirs %u", 1610bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, muxclient_request_id, rid); 1611bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman pid = buffer_get_int(&m); 1612bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 1613bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1614bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug3("%s: done pid = %u", __func__, pid); 1615bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1616bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman muxclient_request_id++; 1617bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1618bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return pid; 1619bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 1620bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1621bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic void 1622bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanmux_client_request_terminate(int fd) 1623bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 1624bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Buffer m; 1625bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char *e; 1626bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int type, rid; 1627bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1628bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug3("%s: entering", __func__); 1629bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1630bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_init(&m); 1631bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, MUX_C_TERMINATE); 1632bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, muxclient_request_id); 1633bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1634bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_client_write_packet(fd, &m) != 0) 1635bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: write packet: %s", __func__, strerror(errno)); 1636bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1637bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_clear(&m); 1638bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1639bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Read their reply */ 1640bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_client_read_packet(fd, &m) != 0) { 1641bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Remote end exited already */ 1642bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (errno == EPIPE) { 1643bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 1644bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return; 1645bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1646bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: read from master failed: %s", 1647bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, strerror(errno)); 1648bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1649bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1650bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman type = buffer_get_int(&m); 1651bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((rid = buffer_get_int(&m)) != muxclient_request_id) 1652bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: out of sequence reply: my id %u theirs %u", 1653bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, muxclient_request_id, rid); 1654bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman switch (type) { 1655bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_S_OK: 1656bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman break; 1657bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_S_PERMISSION_DENIED: 1658bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman e = buffer_get_string(&m, NULL); 1659bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("Master refused termination request: %s", e); 1660bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_S_FAILURE: 1661bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman e = buffer_get_string(&m, NULL); 1662bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: termination request failed: %s", __func__, e); 1663bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman default: 1664bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: unexpected response from master 0x%08x", 1665bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, type); 1666bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1667bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 1668bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman muxclient_request_id++; 1669bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 1670bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1671bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int 1672d059297112922cabb0c674840589be8db821fd9aAdam Langleymux_client_forward(int fd, int cancel_flag, u_int ftype, struct Forward *fwd) 1673bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 1674bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Buffer m; 1675bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char *e, *fwd_desc; 1676bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int type, rid; 1677bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1678bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fwd_desc = format_forward(ftype, fwd); 1679d059297112922cabb0c674840589be8db821fd9aAdam Langley debug("Requesting %s %s", 1680d059297112922cabb0c674840589be8db821fd9aAdam Langley cancel_flag ? "cancellation of" : "forwarding of", fwd_desc); 1681d059297112922cabb0c674840589be8db821fd9aAdam Langley free(fwd_desc); 1682bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1683bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_init(&m); 1684d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_put_int(&m, cancel_flag ? MUX_C_CLOSE_FWD : MUX_C_OPEN_FWD); 1685bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, muxclient_request_id); 1686bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, ftype); 1687d059297112922cabb0c674840589be8db821fd9aAdam Langley if (fwd->listen_path != NULL) { 1688d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_put_cstring(&m, fwd->listen_path); 1689d059297112922cabb0c674840589be8db821fd9aAdam Langley } else { 1690d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_put_cstring(&m, 1691d059297112922cabb0c674840589be8db821fd9aAdam Langley fwd->listen_host == NULL ? "" : 1692d059297112922cabb0c674840589be8db821fd9aAdam Langley (*fwd->listen_host == '\0' ? "*" : fwd->listen_host)); 1693d059297112922cabb0c674840589be8db821fd9aAdam Langley } 1694bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, fwd->listen_port); 1695d059297112922cabb0c674840589be8db821fd9aAdam Langley if (fwd->connect_path != NULL) { 1696d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_put_cstring(&m, fwd->connect_path); 1697d059297112922cabb0c674840589be8db821fd9aAdam Langley } else { 1698d059297112922cabb0c674840589be8db821fd9aAdam Langley buffer_put_cstring(&m, 1699d059297112922cabb0c674840589be8db821fd9aAdam Langley fwd->connect_host == NULL ? "" : fwd->connect_host); 1700d059297112922cabb0c674840589be8db821fd9aAdam Langley } 1701bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, fwd->connect_port); 1702bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1703bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_client_write_packet(fd, &m) != 0) 1704bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: write packet: %s", __func__, strerror(errno)); 1705bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1706bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_clear(&m); 1707bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1708bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Read their reply */ 1709bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_client_read_packet(fd, &m) != 0) { 1710bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 1711bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 1712bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1713bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1714bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman type = buffer_get_int(&m); 1715bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((rid = buffer_get_int(&m)) != muxclient_request_id) 1716bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: out of sequence reply: my id %u theirs %u", 1717bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, muxclient_request_id, rid); 1718bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman switch (type) { 1719bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_S_OK: 1720bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman break; 1721bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_S_REMOTE_PORT: 1722d059297112922cabb0c674840589be8db821fd9aAdam Langley if (cancel_flag) 1723d059297112922cabb0c674840589be8db821fd9aAdam Langley fatal("%s: got MUX_S_REMOTE_PORT for cancel", __func__); 1724bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fwd->allocated_port = buffer_get_int(&m); 1725bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman logit("Allocated port %u for remote forward to %s:%d", 1726bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fwd->allocated_port, 1727bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fwd->connect_host ? fwd->connect_host : "", 1728bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fwd->connect_port); 1729bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (muxclient_command == SSHMUX_COMMAND_FORWARD) 1730bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fprintf(stdout, "%u\n", fwd->allocated_port); 1731bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman break; 1732bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_S_PERMISSION_DENIED: 1733bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman e = buffer_get_string(&m, NULL); 1734bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 1735bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("Master refused forwarding request: %s", e); 1736bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 1737bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_S_FAILURE: 1738bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman e = buffer_get_string(&m, NULL); 1739bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 1740bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: forwarding request failed: %s", __func__, e); 1741bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 1742bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman default: 1743bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: unexpected response from master 0x%08x", 1744bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, type); 1745bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1746bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 1747bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1748bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman muxclient_request_id++; 1749bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 1750bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 1751bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1752bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int 1753d059297112922cabb0c674840589be8db821fd9aAdam Langleymux_client_forwards(int fd, int cancel_flag) 1754bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 1755d059297112922cabb0c674840589be8db821fd9aAdam Langley int i, ret = 0; 1756bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1757d059297112922cabb0c674840589be8db821fd9aAdam Langley debug3("%s: %s forwardings: %d local, %d remote", __func__, 1758d059297112922cabb0c674840589be8db821fd9aAdam Langley cancel_flag ? "cancel" : "request", 1759bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.num_local_forwards, options.num_remote_forwards); 1760bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1761bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* XXX ExitOnForwardingFailure */ 1762bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman for (i = 0; i < options.num_local_forwards; i++) { 1763d059297112922cabb0c674840589be8db821fd9aAdam Langley if (mux_client_forward(fd, cancel_flag, 1764bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.local_forwards[i].connect_port == 0 ? 1765bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman MUX_FWD_DYNAMIC : MUX_FWD_LOCAL, 1766bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.local_forwards + i) != 0) 1767d059297112922cabb0c674840589be8db821fd9aAdam Langley ret = -1; 1768bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1769bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman for (i = 0; i < options.num_remote_forwards; i++) { 1770d059297112922cabb0c674840589be8db821fd9aAdam Langley if (mux_client_forward(fd, cancel_flag, MUX_FWD_REMOTE, 1771bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.remote_forwards + i) != 0) 1772d059297112922cabb0c674840589be8db821fd9aAdam Langley ret = -1; 1773bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1774d059297112922cabb0c674840589be8db821fd9aAdam Langley return ret; 1775bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 1776bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1777bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int 1778bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanmux_client_request_session(int fd) 1779bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 1780bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Buffer m; 1781bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char *e, *term; 1782bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int i, rid, sid, esid, exitval, type, exitval_seen; 1783bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman extern char **environ; 1784bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman int devnull, rawmode; 1785bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1786bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug3("%s: entering", __func__); 1787bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1788bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((muxserver_pid = mux_client_request_alive(fd)) == 0) { 1789bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: master alive request failed", __func__); 1790bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 1791bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1792bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1793bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman signal(SIGPIPE, SIG_IGN); 1794bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1795bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (stdin_null_flag) { 1796bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((devnull = open(_PATH_DEVNULL, O_RDONLY)) == -1) 1797bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("open(/dev/null): %s", strerror(errno)); 1798bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (dup2(devnull, STDIN_FILENO) == -1) 1799bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("dup2: %s", strerror(errno)); 1800bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (devnull > STDERR_FILENO) 1801bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman close(devnull); 1802bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1803bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1804bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman term = getenv("TERM"); 1805bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1806bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_init(&m); 1807bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, MUX_C_NEW_SESSION); 1808bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, muxclient_request_id); 1809bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_cstring(&m, ""); /* reserved */ 1810bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, tty_flag); 1811bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, options.forward_x11); 1812bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, options.forward_agent); 1813bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, subsystem_flag); 1814bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, options.escape_char == SSH_ESCAPECHAR_NONE ? 1815bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 0xffffffff : (u_int)options.escape_char); 1816bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_cstring(&m, term == NULL ? "" : term); 1817bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_string(&m, buffer_ptr(&command), buffer_len(&command)); 1818bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1819bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (options.num_send_env > 0 && environ != NULL) { 1820bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Pass environment */ 1821bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman for (i = 0; environ[i] != NULL; i++) { 1822bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (env_permitted(environ[i])) { 1823bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_cstring(&m, environ[i]); 1824bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1825bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1826bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1827bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1828bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_client_write_packet(fd, &m) != 0) 1829bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: write packet: %s", __func__, strerror(errno)); 1830bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1831bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Send the stdio file descriptors */ 1832bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mm_send_fd(fd, STDIN_FILENO) == -1 || 1833bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman mm_send_fd(fd, STDOUT_FILENO) == -1 || 1834bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman mm_send_fd(fd, STDERR_FILENO) == -1) 1835bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: send fds failed", __func__); 1836bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1837bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug3("%s: session request sent", __func__); 1838bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1839bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Read their reply */ 1840bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_clear(&m); 1841bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_client_read_packet(fd, &m) != 0) { 1842bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: read from master failed: %s", 1843bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, strerror(errno)); 1844bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 1845bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 1846bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1847bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1848bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman type = buffer_get_int(&m); 1849bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((rid = buffer_get_int(&m)) != muxclient_request_id) 1850bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: out of sequence reply: my id %u theirs %u", 1851bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, muxclient_request_id, rid); 1852bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman switch (type) { 1853bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_S_SESSION_OPENED: 1854bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman sid = buffer_get_int(&m); 1855bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug("%s: master session id: %u", __func__, sid); 1856bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman break; 1857bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_S_PERMISSION_DENIED: 1858bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman e = buffer_get_string(&m, NULL); 1859bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 1860bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("Master refused session request: %s", e); 1861bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 1862bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_S_FAILURE: 1863bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman e = buffer_get_string(&m, NULL); 1864bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 1865bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: session request failed: %s", __func__, e); 1866bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 1867bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman default: 1868bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 1869bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: unexpected response from master 0x%08x", 1870bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, type); 1871bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 1872bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1873bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman muxclient_request_id++; 1874bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1875bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman signal(SIGHUP, control_client_sighandler); 1876bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman signal(SIGINT, control_client_sighandler); 1877bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman signal(SIGTERM, control_client_sighandler); 1878bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman signal(SIGWINCH, control_client_sigrelay); 1879bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1880bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman rawmode = tty_flag; 1881bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (tty_flag) 1882bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE); 1883bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1884bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* 1885bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * Stick around until the controlee closes the client_fd. 1886bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * Before it does, it is expected to write an exit message. 1887bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * This process must read the value and wait for the closure of 1888bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * the client_fd; if this one closes early, the multiplex master will 1889bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * terminate early too (possibly losing data). 1890bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman */ 1891bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman for (exitval = 255, exitval_seen = 0;;) { 1892bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_clear(&m); 1893bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_client_read_packet(fd, &m) != 0) 1894bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman break; 1895bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman type = buffer_get_int(&m); 1896bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman switch (type) { 1897bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_S_TTY_ALLOC_FAIL: 1898bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((esid = buffer_get_int(&m)) != sid) 1899bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: tty alloc fail on unknown session: " 1900bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman "my id %u theirs %u", 1901bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, sid, esid); 1902bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman leave_raw_mode(options.request_tty == 1903bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman REQUEST_TTY_FORCE); 1904bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman rawmode = 0; 1905bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman continue; 1906bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_S_EXIT_MESSAGE: 1907bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((esid = buffer_get_int(&m)) != sid) 1908bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: exit on unknown session: " 1909bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman "my id %u theirs %u", 1910bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, sid, esid); 1911bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (exitval_seen) 1912bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: exitval sent twice", __func__); 1913bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman exitval = buffer_get_int(&m); 1914bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman exitval_seen = 1; 1915bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman continue; 1916bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman default: 1917bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman e = buffer_get_string(&m, NULL); 1918bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: master returned error: %s", __func__, e); 1919bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1920bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1921bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1922bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman close(fd); 1923bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (rawmode) 1924bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE); 1925bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1926bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (muxclient_terminate) { 1927bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("Exiting on signal %d", muxclient_terminate); 1928bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman exitval = 255; 1929bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } else if (!exitval_seen) { 1930bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("Control master terminated unexpectedly"); 1931bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman exitval = 255; 1932bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } else 1933bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug2("Received exit status from master %d", exitval); 1934bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1935bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET) 1936bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fprintf(stderr, "Shared connection to %s closed.\r\n", host); 1937bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1938bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman exit(exitval); 1939bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 1940bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1941bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic int 1942bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanmux_client_request_stdio_fwd(int fd) 1943bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 1944bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Buffer m; 1945bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char *e; 1946bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int type, rid, sid; 1947bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman int devnull; 1948bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1949bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug3("%s: entering", __func__); 1950bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1951bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((muxserver_pid = mux_client_request_alive(fd)) == 0) { 1952bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: master alive request failed", __func__); 1953bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 1954bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1955bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1956bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman signal(SIGPIPE, SIG_IGN); 1957bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1958bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (stdin_null_flag) { 1959bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((devnull = open(_PATH_DEVNULL, O_RDONLY)) == -1) 1960bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("open(/dev/null): %s", strerror(errno)); 1961bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (dup2(devnull, STDIN_FILENO) == -1) 1962bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("dup2: %s", strerror(errno)); 1963bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (devnull > STDERR_FILENO) 1964bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman close(devnull); 1965bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1966bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1967bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_init(&m); 1968bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, MUX_C_NEW_STDIO_FWD); 1969bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, muxclient_request_id); 1970bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_cstring(&m, ""); /* reserved */ 1971bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_cstring(&m, stdio_forward_host); 1972bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, stdio_forward_port); 1973bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1974bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_client_write_packet(fd, &m) != 0) 1975bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: write packet: %s", __func__, strerror(errno)); 1976bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1977bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Send the stdio file descriptors */ 1978bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mm_send_fd(fd, STDIN_FILENO) == -1 || 1979bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman mm_send_fd(fd, STDOUT_FILENO) == -1) 1980bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: send fds failed", __func__); 1981bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1982bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug3("%s: stdio forward request sent", __func__); 1983bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1984bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Read their reply */ 1985bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_clear(&m); 1986bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1987bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_client_read_packet(fd, &m) != 0) { 1988bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: read from master failed: %s", 1989bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, strerror(errno)); 1990bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 1991bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 1992bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 1993bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 1994bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman type = buffer_get_int(&m); 1995bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((rid = buffer_get_int(&m)) != muxclient_request_id) 1996bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: out of sequence reply: my id %u theirs %u", 1997bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, muxclient_request_id, rid); 1998bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman switch (type) { 1999bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_S_SESSION_OPENED: 2000bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman sid = buffer_get_int(&m); 2001bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug("%s: master session id: %u", __func__, sid); 2002bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman break; 2003bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_S_PERMISSION_DENIED: 2004bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman e = buffer_get_string(&m, NULL); 2005bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 2006bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("Master refused stdio forwarding request: %s", e); 2007bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_S_FAILURE: 2008bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman e = buffer_get_string(&m, NULL); 2009bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 2010d059297112922cabb0c674840589be8db821fd9aAdam Langley fatal("Stdio forwarding request failed: %s", e); 2011bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman default: 2012bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 2013bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: unexpected response from master 0x%08x", 2014bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, type); 2015bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return -1; 2016bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 2017bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman muxclient_request_id++; 2018bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 2019bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman signal(SIGHUP, control_client_sighandler); 2020bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman signal(SIGINT, control_client_sighandler); 2021bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman signal(SIGTERM, control_client_sighandler); 2022bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman signal(SIGWINCH, control_client_sigrelay); 2023bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 2024bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* 2025bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * Stick around until the controlee closes the client_fd. 2026bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman */ 2027bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_clear(&m); 2028bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_client_read_packet(fd, &m) != 0) { 2029bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (errno == EPIPE || 2030bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman (errno == EINTR && muxclient_terminate != 0)) 2031bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return 0; 2032bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: mux_client_read_packet: %s", 2033bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, strerror(errno)); 2034bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 2035bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: master returned unexpected message %u", __func__, type); 2036bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 2037bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 2038bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstatic void 2039bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanmux_client_request_stop_listening(int fd) 2040bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 2041bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman Buffer m; 2042bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char *e; 2043bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int type, rid; 2044bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 2045bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug3("%s: entering", __func__); 2046bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 2047bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_init(&m); 2048bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, MUX_C_STOP_LISTENING); 2049bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_put_int(&m, muxclient_request_id); 2050bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 2051bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_client_write_packet(fd, &m) != 0) 2052bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: write packet: %s", __func__, strerror(errno)); 2053bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 2054bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_clear(&m); 2055bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 2056bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Read their reply */ 2057bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_client_read_packet(fd, &m) != 0) 2058bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: read from master failed: %s", 2059bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, strerror(errno)); 2060bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 2061bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman type = buffer_get_int(&m); 2062bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((rid = buffer_get_int(&m)) != muxclient_request_id) 2063bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: out of sequence reply: my id %u theirs %u", 2064bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, muxclient_request_id, rid); 2065bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman switch (type) { 2066bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_S_OK: 2067bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman break; 2068bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_S_PERMISSION_DENIED: 2069bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman e = buffer_get_string(&m, NULL); 2070bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("Master refused stop listening request: %s", e); 2071bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case MUX_S_FAILURE: 2072bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman e = buffer_get_string(&m, NULL); 2073bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: stop listening request failed: %s", __func__, e); 2074bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman default: 2075bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: unexpected response from master 0x%08x", 2076bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman __func__, type); 2077bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 2078bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman buffer_free(&m); 2079bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman muxclient_request_id++; 2080bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 2081bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 2082bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* Multiplex client main loop. */ 2083bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanvoid 2084bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanmuxclient(const char *path) 2085bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 2086bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman struct sockaddr_un addr; 2087bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman socklen_t sun_len; 2088bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman int sock; 2089bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman u_int pid; 2090bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 2091bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (muxclient_command == 0) { 2092bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (stdio_forward_host != NULL) 2093bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman muxclient_command = SSHMUX_COMMAND_STDIO_FWD; 2094bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman else 2095bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman muxclient_command = SSHMUX_COMMAND_OPEN; 2096bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 2097bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 2098bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman switch (options.control_master) { 2099bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case SSHCTL_MASTER_AUTO: 2100bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case SSHCTL_MASTER_AUTO_ASK: 2101bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug("auto-mux: Trying existing master"); 2102bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* FALLTHROUGH */ 2103bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case SSHCTL_MASTER_NO: 2104bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman break; 2105bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman default: 2106bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return; 2107bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 2108bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 2109bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman memset(&addr, '\0', sizeof(addr)); 2110bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman addr.sun_family = AF_UNIX; 2111bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman sun_len = offsetof(struct sockaddr_un, sun_path) + 2112bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman strlen(path) + 1; 2113bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 2114bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (strlcpy(addr.sun_path, path, 2115bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) 2116bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("ControlPath too long"); 2117bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 2118bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) 2119bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s socket(): %s", __func__, strerror(errno)); 2120bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 2121bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (connect(sock, (struct sockaddr *)&addr, sun_len) == -1) { 2122bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman switch (muxclient_command) { 2123bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case SSHMUX_COMMAND_OPEN: 2124bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case SSHMUX_COMMAND_STDIO_FWD: 2125bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman break; 2126bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman default: 2127bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("Control socket connect(%.100s): %s", path, 2128bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman strerror(errno)); 2129bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 2130bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (errno == ECONNREFUSED && 2131bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman options.control_master != SSHCTL_MASTER_NO) { 2132bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug("Stale control socket %.100s, unlinking", path); 2133bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman unlink(path); 2134bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } else if (errno == ENOENT) { 2135bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman debug("Control socket \"%.100s\" does not exist", path); 2136bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } else { 2137bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("Control socket connect(%.100s): %s", path, 2138bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman strerror(errno)); 2139bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 2140bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman close(sock); 2141bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return; 2142bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 2143bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman set_nonblock(sock); 2144bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 2145bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (mux_client_hello_exchange(sock) != 0) { 2146bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: master hello exchange failed", __func__); 2147bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman close(sock); 2148bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return; 2149bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 2150bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 2151bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman switch (muxclient_command) { 2152bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case SSHMUX_COMMAND_ALIVE_CHECK: 2153bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if ((pid = mux_client_request_alive(sock)) == 0) 2154bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: master alive check failed", __func__); 2155bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fprintf(stderr, "Master running (pid=%d)\r\n", pid); 2156bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman exit(0); 2157bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case SSHMUX_COMMAND_TERMINATE: 2158bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman mux_client_request_terminate(sock); 2159bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fprintf(stderr, "Exit request sent.\r\n"); 2160bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman exit(0); 2161bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case SSHMUX_COMMAND_FORWARD: 2162d059297112922cabb0c674840589be8db821fd9aAdam Langley if (mux_client_forwards(sock, 0) != 0) 2163bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("%s: master forward request failed", __func__); 2164bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman exit(0); 2165bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case SSHMUX_COMMAND_OPEN: 2166d059297112922cabb0c674840589be8db821fd9aAdam Langley if (mux_client_forwards(sock, 0) != 0) { 2167bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman error("%s: master forward request failed", __func__); 2168bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return; 2169bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 2170bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman mux_client_request_session(sock); 2171bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return; 2172bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case SSHMUX_COMMAND_STDIO_FWD: 2173bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman mux_client_request_stdio_fwd(sock); 2174bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman exit(0); 2175bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman case SSHMUX_COMMAND_STOP: 2176bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman mux_client_request_stop_listening(sock); 2177bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fprintf(stderr, "Stop listening request sent.\r\n"); 2178bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman exit(0); 2179d059297112922cabb0c674840589be8db821fd9aAdam Langley case SSHMUX_COMMAND_CANCEL_FWD: 2180d059297112922cabb0c674840589be8db821fd9aAdam Langley if (mux_client_forwards(sock, 1) != 0) 2181d059297112922cabb0c674840589be8db821fd9aAdam Langley error("%s: master cancel forward request failed", 2182d059297112922cabb0c674840589be8db821fd9aAdam Langley __func__); 2183d059297112922cabb0c674840589be8db821fd9aAdam Langley exit(0); 2184bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman default: 2185bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman fatal("unrecognised muxclient_command %d", muxclient_command); 2186bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 2187bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 2188