Annotation of src/usr.bin/ssh/clientloop.c, Revision 1.138
1.1 deraadt 1: /*
1.12 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
1.33 deraadt 5: * The main loop for the interactive session (client side).
1.20 markus 6: *
1.33 deraadt 7: * As far as I am concerned, the code I have written for this software
8: * can be used freely for any purpose. Any derived versions of this
9: * software must be clearly marked as such, and if the derived work is
10: * incompatible with the protocol description in the RFC file, it must be
11: * called by a name other than "ssh" or "Secure Shell".
12: *
13: *
14: * Copyright (c) 1999 Theo de Raadt. All rights reserved.
15: *
16: * Redistribution and use in source and binary forms, with or without
17: * modification, are permitted provided that the following conditions
18: * are met:
19: * 1. Redistributions of source code must retain the above copyright
20: * notice, this list of conditions and the following disclaimer.
21: * 2. Redistributions in binary form must reproduce the above copyright
22: * notice, this list of conditions and the following disclaimer in the
23: * documentation and/or other materials provided with the distribution.
24: *
25: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.20 markus 35: *
36: *
1.33 deraadt 37: * SSH2 support added by Markus Friedl.
1.78 markus 38: * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
1.20 markus 39: *
1.33 deraadt 40: * Redistribution and use in source and binary forms, with or without
41: * modification, are permitted provided that the following conditions
42: * are met:
43: * 1. Redistributions of source code must retain the above copyright
44: * notice, this list of conditions and the following disclaimer.
45: * 2. Redistributions in binary form must reproduce the above copyright
46: * notice, this list of conditions and the following disclaimer in the
47: * documentation and/or other materials provided with the distribution.
48: *
49: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
50: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
51: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
52: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
53: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
54: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
55: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
56: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
57: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
58: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.12 deraadt 59: */
1.1 deraadt 60:
61: #include "includes.h"
1.138 ! djm 62: RCSID("$OpenBSD: clientloop.c,v 1.137 2005/06/08 11:25:09 djm Exp $");
1.1 deraadt 63:
1.45 markus 64: #include "ssh.h"
65: #include "ssh1.h"
66: #include "ssh2.h"
1.1 deraadt 67: #include "xmalloc.h"
68: #include "packet.h"
69: #include "buffer.h"
1.15 markus 70: #include "compat.h"
1.74 markus 71: #include "channels.h"
1.15 markus 72: #include "dispatch.h"
1.30 markus 73: #include "buffer.h"
74: #include "bufaux.h"
1.40 markus 75: #include "key.h"
1.54 markus 76: #include "kex.h"
1.45 markus 77: #include "log.h"
78: #include "readconf.h"
79: #include "clientloop.h"
1.40 markus 80: #include "authfd.h"
1.45 markus 81: #include "atomicio.h"
1.118 deraadt 82: #include "sshpty.h"
1.63 markus 83: #include "misc.h"
1.123 djm 84: #include "monitor_fdpass.h"
85: #include "match.h"
86: #include "msg.h"
1.39 markus 87:
88: /* import options */
89: extern Options options;
90:
1.1 deraadt 91: /* Flag indicating that stdin should be redirected from /dev/null. */
92: extern int stdin_null_flag;
93:
1.116 dtucker 94: /* Flag indicating that no shell has been requested */
95: extern int no_shell_flag;
96:
1.123 djm 97: /* Control socket */
98: extern int control_fd;
99:
1.13 markus 100: /*
101: * Name of the host we are connecting to. This is the name given on the
102: * command line, or the HostName specified for the user-supplied name in a
103: * configuration file.
104: */
1.1 deraadt 105: extern char *host;
106:
1.13 markus 107: /*
108: * Flag to indicate that we have received a window change signal which has
109: * not yet been processed. This will cause a message indicating the new
110: * window size to be sent to the server a little later. This is volatile
111: * because this is updated in a signal handler.
112: */
1.88 markus 113: static volatile sig_atomic_t received_window_change_signal = 0;
114: static volatile sig_atomic_t received_signal = 0;
1.1 deraadt 115:
116: /* Flag indicating whether the user\'s terminal is in non-blocking mode. */
117: static int in_non_blocking_mode = 0;
118:
119: /* Common data for the client loop code. */
1.31 markus 120: static int quit_pending; /* Set to non-zero to quit the client loop. */
121: static int escape_char; /* Escape character. */
1.11 markus 122: static int escape_pending; /* Last character was the escape character */
123: static int last_was_cr; /* Last character was a newline. */
124: static int exit_status; /* Used to store the exit status of the command. */
125: static int stdin_eof; /* EOF has been encountered on standard error. */
126: static Buffer stdin_buffer; /* Buffer for stdin data. */
127: static Buffer stdout_buffer; /* Buffer for stdout data. */
128: static Buffer stderr_buffer; /* Buffer for stderr data. */
1.42 markus 129: static u_long stdin_bytes, stdout_bytes, stderr_bytes;
130: static u_int buffer_high;/* Soft max buffer size. */
1.11 markus 131: static int connection_in; /* Connection to server (input). */
132: static int connection_out; /* Connection to server (output). */
1.56 markus 133: static int need_rekeying; /* Set to non-zero if rekeying is requested. */
1.60 markus 134: static int session_closed = 0; /* In SSH2: login session closed. */
1.117 markus 135: static int server_alive_timeouts = 0;
1.1 deraadt 136:
1.77 itojun 137: static void client_init_dispatch(void);
1.16 markus 138: int session_ident = -1;
139:
1.123 djm 140: struct confirm_ctx {
141: int want_tty;
142: int want_subsys;
143: Buffer cmd;
144: char *term;
145: struct termios tio;
1.126 djm 146: char **env;
1.123 djm 147: };
148:
1.54 markus 149: /*XXX*/
150: extern Kex *xxx_kex;
151:
1.123 djm 152: void ssh_process_session2_setup(int, int, int, Buffer *);
153:
1.1 deraadt 154: /* Restores stdin to blocking mode. */
155:
1.77 itojun 156: static void
1.49 itojun 157: leave_non_blocking(void)
1.1 deraadt 158: {
1.11 markus 159: if (in_non_blocking_mode) {
1.125 djm 160: unset_nonblock(fileno(stdin));
1.11 markus 161: in_non_blocking_mode = 0;
162: }
1.1 deraadt 163: }
164:
1.11 markus 165: /* Puts stdin terminal in non-blocking mode. */
166:
1.77 itojun 167: static void
1.49 itojun 168: enter_non_blocking(void)
1.1 deraadt 169: {
1.11 markus 170: in_non_blocking_mode = 1;
1.124 djm 171: set_nonblock(fileno(stdin));
1.1 deraadt 172: }
173:
1.13 markus 174: /*
175: * Signal handler for the window change signal (SIGWINCH). This just sets a
176: * flag indicating that the window has changed.
177: */
1.1 deraadt 178:
1.77 itojun 179: static void
1.11 markus 180: window_change_handler(int sig)
1.1 deraadt 181: {
1.11 markus 182: received_window_change_signal = 1;
183: signal(SIGWINCH, window_change_handler);
1.1 deraadt 184: }
185:
1.13 markus 186: /*
187: * Signal handler for signals that cause the program to terminate. These
188: * signals must be trapped to restore terminal modes.
189: */
1.1 deraadt 190:
1.77 itojun 191: static void
1.11 markus 192: signal_handler(int sig)
1.1 deraadt 193: {
1.75 markus 194: received_signal = sig;
195: quit_pending = 1;
1.1 deraadt 196: }
197:
1.13 markus 198: /*
199: * Returns current time in seconds from Jan 1, 1970 with the maximum
200: * available resolution.
201: */
1.1 deraadt 202:
1.77 itojun 203: static double
1.49 itojun 204: get_current_time(void)
1.1 deraadt 205: {
1.11 markus 206: struct timeval tv;
207: gettimeofday(&tv, NULL);
208: return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
1.138 ! djm 209: }
! 210:
! 211: #define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
! 212: void
! 213: client_x11_get_proto(const char *display, const char *xauth_path,
! 214: u_int trusted, char **_proto, char **_data)
! 215: {
! 216: char cmd[1024];
! 217: char line[512];
! 218: char xdisplay[512];
! 219: static char proto[512], data[512];
! 220: FILE *f;
! 221: int got_data = 0, generated = 0, do_unlink = 0, i;
! 222: char *xauthdir, *xauthfile;
! 223: struct stat st;
! 224:
! 225: xauthdir = xauthfile = NULL;
! 226: *_proto = proto;
! 227: *_data = data;
! 228: proto[0] = data[0] = '\0';
! 229:
! 230: if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
! 231: debug("No xauth program.");
! 232: } else {
! 233: if (display == NULL) {
! 234: debug("x11_get_proto: DISPLAY not set");
! 235: return;
! 236: }
! 237: /*
! 238: * Handle FamilyLocal case where $DISPLAY does
! 239: * not match an authorization entry. For this we
! 240: * just try "xauth list unix:displaynum.screennum".
! 241: * XXX: "localhost" match to determine FamilyLocal
! 242: * is not perfect.
! 243: */
! 244: if (strncmp(display, "localhost:", 10) == 0) {
! 245: snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
! 246: display + 10);
! 247: display = xdisplay;
! 248: }
! 249: if (trusted == 0) {
! 250: xauthdir = xmalloc(MAXPATHLEN);
! 251: xauthfile = xmalloc(MAXPATHLEN);
! 252: strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
! 253: if (mkdtemp(xauthdir) != NULL) {
! 254: do_unlink = 1;
! 255: snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
! 256: xauthdir);
! 257: snprintf(cmd, sizeof(cmd),
! 258: "%s -f %s generate %s " SSH_X11_PROTO
! 259: " untrusted timeout 1200 2>" _PATH_DEVNULL,
! 260: xauth_path, xauthfile, display);
! 261: debug2("x11_get_proto: %s", cmd);
! 262: if (system(cmd) == 0)
! 263: generated = 1;
! 264: }
! 265: }
! 266: snprintf(cmd, sizeof(cmd),
! 267: "%s %s%s list %s . 2>" _PATH_DEVNULL,
! 268: xauth_path,
! 269: generated ? "-f " : "" ,
! 270: generated ? xauthfile : "",
! 271: display);
! 272: debug2("x11_get_proto: %s", cmd);
! 273: f = popen(cmd, "r");
! 274: if (f && fgets(line, sizeof(line), f) &&
! 275: sscanf(line, "%*s %511s %511s", proto, data) == 2)
! 276: got_data = 1;
! 277: if (f)
! 278: pclose(f);
! 279: }
! 280:
! 281: if (do_unlink) {
! 282: unlink(xauthfile);
! 283: rmdir(xauthdir);
! 284: }
! 285: if (xauthdir)
! 286: xfree(xauthdir);
! 287: if (xauthfile)
! 288: xfree(xauthfile);
! 289:
! 290: /*
! 291: * If we didn't get authentication data, just make up some
! 292: * data. The forwarding code will check the validity of the
! 293: * response anyway, and substitute this data. The X11
! 294: * server, however, will ignore this fake data and use
! 295: * whatever authentication mechanisms it was using otherwise
! 296: * for the local connection.
! 297: */
! 298: if (!got_data) {
! 299: u_int32_t rnd = 0;
! 300:
! 301: logit("Warning: No xauth data; "
! 302: "using fake authentication data for X11 forwarding.");
! 303: strlcpy(proto, SSH_X11_PROTO, sizeof proto);
! 304: for (i = 0; i < 16; i++) {
! 305: if (i % 4 == 0)
! 306: rnd = arc4random();
! 307: snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
! 308: rnd & 0xff);
! 309: rnd >>= 8;
! 310: }
! 311: }
1.1 deraadt 312: }
313:
1.13 markus 314: /*
315: * This is called when the interactive is entered. This checks if there is
316: * an EOF coming on stdin. We must check this explicitly, as select() does
317: * not appear to wake up when redirecting from /dev/null.
318: */
1.1 deraadt 319:
1.77 itojun 320: static void
1.49 itojun 321: client_check_initial_eof_on_stdin(void)
1.1 deraadt 322: {
1.11 markus 323: int len;
324: char buf[1];
1.1 deraadt 325:
1.13 markus 326: /*
327: * If standard input is to be "redirected from /dev/null", we simply
328: * mark that we have seen an EOF and send an EOF message to the
329: * server. Otherwise, we try to read a single character; it appears
330: * that for some files, such /dev/null, select() never wakes up for
331: * read for this descriptor, which means that we never get EOF. This
332: * way we will get the EOF if stdin comes from /dev/null or similar.
333: */
1.11 markus 334: if (stdin_null_flag) {
335: /* Fake EOF on stdin. */
336: debug("Sending eof.");
337: stdin_eof = 1;
338: packet_start(SSH_CMSG_EOF);
339: packet_send();
340: } else {
341: enter_non_blocking();
342:
343: /* Check for immediate EOF on stdin. */
344: len = read(fileno(stdin), buf, 1);
345: if (len == 0) {
1.13 markus 346: /* EOF. Record that we have seen it and send EOF to server. */
1.11 markus 347: debug("Sending eof.");
348: stdin_eof = 1;
349: packet_start(SSH_CMSG_EOF);
350: packet_send();
351: } else if (len > 0) {
1.13 markus 352: /*
353: * Got data. We must store the data in the buffer,
354: * and also process it as an escape character if
355: * appropriate.
356: */
1.42 markus 357: if ((u_char) buf[0] == escape_char)
1.11 markus 358: escape_pending = 1;
1.52 markus 359: else
1.11 markus 360: buffer_append(&stdin_buffer, buf, 1);
361: }
362: leave_non_blocking();
363: }
1.1 deraadt 364: }
365:
366:
1.13 markus 367: /*
368: * Make packets from buffered stdin data, and buffer them for sending to the
369: * connection.
370: */
1.1 deraadt 371:
1.77 itojun 372: static void
1.49 itojun 373: client_make_packets_from_stdin_data(void)
1.1 deraadt 374: {
1.42 markus 375: u_int len;
1.1 deraadt 376:
1.11 markus 377: /* Send buffered stdin data to the server. */
378: while (buffer_len(&stdin_buffer) > 0 &&
1.90 deraadt 379: packet_not_very_much_data_to_write()) {
1.11 markus 380: len = buffer_len(&stdin_buffer);
381: /* Keep the packets at reasonable size. */
382: if (len > packet_get_maxsize())
383: len = packet_get_maxsize();
384: packet_start(SSH_CMSG_STDIN_DATA);
385: packet_put_string(buffer_ptr(&stdin_buffer), len);
386: packet_send();
387: buffer_consume(&stdin_buffer, len);
1.52 markus 388: stdin_bytes += len;
1.11 markus 389: /* If we have a pending EOF, send it now. */
390: if (stdin_eof && buffer_len(&stdin_buffer) == 0) {
391: packet_start(SSH_CMSG_EOF);
392: packet_send();
393: }
1.1 deraadt 394: }
395: }
396:
1.13 markus 397: /*
398: * Checks if the client window has changed, and sends a packet about it to
399: * the server if so. The actual change is detected elsewhere (by a software
400: * interrupt on Unix); this just checks the flag and sends a message if
401: * appropriate.
402: */
1.1 deraadt 403:
1.77 itojun 404: static void
1.49 itojun 405: client_check_window_change(void)
1.1 deraadt 406: {
1.16 markus 407: struct winsize ws;
408:
409: if (! received_window_change_signal)
410: return;
411: /** XXX race */
412: received_window_change_signal = 0;
413:
1.37 markus 414: debug2("client_check_window_change: changed");
1.16 markus 415:
416: if (compat20) {
1.123 djm 417: channel_send_window_changes();
1.16 markus 418: } else {
1.123 djm 419: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
420: return;
1.16 markus 421: packet_start(SSH_CMSG_WINDOW_SIZE);
422: packet_put_int(ws.ws_row);
423: packet_put_int(ws.ws_col);
424: packet_put_int(ws.ws_xpixel);
425: packet_put_int(ws.ws_ypixel);
426: packet_send();
1.1 deraadt 427: }
428: }
429:
1.117 markus 430: static void
431: client_global_request_reply(int type, u_int32_t seq, void *ctxt)
432: {
433: server_alive_timeouts = 0;
434: client_global_request_reply_fwd(type, seq, ctxt);
435: }
436:
437: static void
438: server_alive_check(void)
439: {
440: if (++server_alive_timeouts > options.server_alive_count_max)
441: packet_disconnect("Timeout, server not responding.");
442: packet_start(SSH2_MSG_GLOBAL_REQUEST);
443: packet_put_cstring("keepalive@openssh.com");
444: packet_put_char(1); /* boolean: want reply */
445: packet_send();
446: }
447:
1.13 markus 448: /*
449: * Waits until the client can do something (some data becomes available on
450: * one of the file descriptors).
451: */
1.77 itojun 452: static void
1.46 markus 453: client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
1.130 avsm 454: int *maxfdp, u_int *nallocp, int rekeying)
1.11 markus 455: {
1.117 markus 456: struct timeval tv, *tvp;
457: int ret;
458:
1.46 markus 459: /* Add any selections by the channel mechanism. */
1.81 markus 460: channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
1.11 markus 461:
1.16 markus 462: if (!compat20) {
1.17 markus 463: /* Read from the connection, unless our buffers are full. */
1.16 markus 464: if (buffer_len(&stdout_buffer) < buffer_high &&
465: buffer_len(&stderr_buffer) < buffer_high &&
466: channel_not_very_much_buffered_data())
1.46 markus 467: FD_SET(connection_in, *readsetp);
1.17 markus 468: /*
469: * Read from stdin, unless we have seen EOF or have very much
470: * buffered data to send to the server.
471: */
472: if (!stdin_eof && packet_not_very_much_data_to_write())
1.46 markus 473: FD_SET(fileno(stdin), *readsetp);
1.17 markus 474:
475: /* Select stdout/stderr if have data in buffer. */
476: if (buffer_len(&stdout_buffer) > 0)
1.46 markus 477: FD_SET(fileno(stdout), *writesetp);
1.17 markus 478: if (buffer_len(&stderr_buffer) > 0)
1.46 markus 479: FD_SET(fileno(stderr), *writesetp);
1.16 markus 480: } else {
1.71 markus 481: /* channel_prepare_select could have closed the last channel */
1.84 markus 482: if (session_closed && !channel_still_open() &&
483: !packet_have_data_to_write()) {
484: /* clear mask since we did not call select() */
1.87 markus 485: memset(*readsetp, 0, *nallocp);
486: memset(*writesetp, 0, *nallocp);
1.84 markus 487: return;
1.71 markus 488: } else {
489: FD_SET(connection_in, *readsetp);
490: }
1.16 markus 491: }
1.11 markus 492:
493: /* Select server connection if have data to write to the server. */
494: if (packet_have_data_to_write())
1.46 markus 495: FD_SET(connection_out, *writesetp);
1.11 markus 496:
1.123 djm 497: if (control_fd != -1)
498: FD_SET(control_fd, *readsetp);
499:
1.13 markus 500: /*
501: * Wait for something to happen. This will suspend the process until
502: * some selected descriptor can be read, written, or has some other
1.117 markus 503: * event pending.
1.13 markus 504: */
1.11 markus 505:
1.117 markus 506: if (options.server_alive_interval == 0 || !compat20)
507: tvp = NULL;
1.129 deraadt 508: else {
1.117 markus 509: tv.tv_sec = options.server_alive_interval;
510: tv.tv_usec = 0;
511: tvp = &tv;
512: }
513: ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
514: if (ret < 0) {
1.11 markus 515: char buf[100];
1.51 markus 516:
517: /*
518: * We have to clear the select masks, because we return.
519: * We have to return, because the mainloop checks for the flags
520: * set by the signal handlers.
521: */
1.87 markus 522: memset(*readsetp, 0, *nallocp);
523: memset(*writesetp, 0, *nallocp);
1.50 deraadt 524:
1.11 markus 525: if (errno == EINTR)
526: return;
527: /* Note: we might still have data in the buffers. */
528: snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
529: buffer_append(&stderr_buffer, buf, strlen(buf));
530: quit_pending = 1;
1.117 markus 531: } else if (ret == 0)
532: server_alive_check();
1.11 markus 533: }
534:
1.77 itojun 535: static void
1.31 markus 536: client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
1.1 deraadt 537: {
1.11 markus 538: /* Flush stdout and stderr buffers. */
1.31 markus 539: if (buffer_len(bout) > 0)
1.112 deraadt 540: atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
1.31 markus 541: if (buffer_len(berr) > 0)
1.112 deraadt 542: atomicio(vwrite, fileno(stderr), buffer_ptr(berr), buffer_len(berr));
1.11 markus 543:
544: leave_raw_mode();
545:
1.13 markus 546: /*
547: * Free (and clear) the buffer to reduce the amount of data that gets
548: * written to swap.
549: */
1.31 markus 550: buffer_free(bin);
551: buffer_free(bout);
552: buffer_free(berr);
1.11 markus 553:
554: /* Send the suspend signal to the program itself. */
555: kill(getpid(), SIGTSTP);
556:
1.132 djm 557: /* Reset window sizes in case they have changed */
558: received_window_change_signal = 1;
1.11 markus 559:
560: /* OK, we have been continued by the user. Reinitialize buffers. */
1.31 markus 561: buffer_init(bin);
562: buffer_init(bout);
563: buffer_init(berr);
1.11 markus 564:
565: enter_raw_mode();
566: }
567:
1.77 itojun 568: static void
1.17 markus 569: client_process_net_input(fd_set * readset)
1.11 markus 570: {
1.17 markus 571: int len;
572: char buf[8192];
1.11 markus 573:
1.13 markus 574: /*
575: * Read input from the server, and add any such data to the buffer of
576: * the packet subsystem.
577: */
1.11 markus 578: if (FD_ISSET(connection_in, readset)) {
579: /* Read as much as possible. */
580: len = read(connection_in, buf, sizeof(buf));
581: if (len == 0) {
582: /* Received EOF. The remote host has closed the connection. */
583: snprintf(buf, sizeof buf, "Connection to %.300s closed by remote host.\r\n",
584: host);
1.1 deraadt 585: buffer_append(&stderr_buffer, buf, strlen(buf));
586: quit_pending = 1;
587: return;
1.11 markus 588: }
1.13 markus 589: /*
590: * There is a kernel bug on Solaris that causes select to
591: * sometimes wake up even though there is no data available.
592: */
1.53 millert 593: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1.11 markus 594: len = 0;
595:
596: if (len < 0) {
597: /* An error has encountered. Perhaps there is a network problem. */
598: snprintf(buf, sizeof buf, "Read from remote host %.300s: %.100s\r\n",
599: host, strerror(errno));
600: buffer_append(&stderr_buffer, buf, strlen(buf));
601: quit_pending = 1;
602: return;
603: }
604: packet_process_incoming(buf, len);
605: }
1.17 markus 606: }
1.16 markus 607:
1.97 jakob 608: static void
1.123 djm 609: client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
610: {
611: int id;
612: Channel *c;
1.129 deraadt 613:
1.123 djm 614: id = packet_get_int();
615: packet_check_eom();
616:
617: if ((c = channel_lookup(id)) == NULL) {
618: error("%s: no channel for id %d", __func__, id);
619: return;
620: }
621:
622: if (type == SSH2_MSG_CHANNEL_SUCCESS)
623: debug2("Request suceeded on channel %d", id);
624: else if (type == SSH2_MSG_CHANNEL_FAILURE) {
625: error("Request failed on channel %d", id);
626: channel_free(c);
627: }
628: }
629:
630: static void
631: client_extra_session2_setup(int id, void *arg)
632: {
633: struct confirm_ctx *cctx = arg;
634: Channel *c;
1.126 djm 635: int i;
1.129 deraadt 636:
1.123 djm 637: if (cctx == NULL)
638: fatal("%s: cctx == NULL", __func__);
639: if ((c = channel_lookup(id)) == NULL)
640: fatal("%s: no channel for id %d", __func__, id);
641:
1.129 deraadt 642: client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
1.126 djm 643: cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
1.123 djm 644: client_subsystem_reply);
1.127 djm 645:
1.123 djm 646: c->confirm_ctx = NULL;
647: buffer_free(&cctx->cmd);
1.126 djm 648: xfree(cctx->term);
649: if (cctx->env != NULL) {
650: for (i = 0; cctx->env[i] != NULL; i++)
651: xfree(cctx->env[i]);
652: xfree(cctx->env);
1.129 deraadt 653: }
1.126 djm 654: xfree(cctx);
1.123 djm 655: }
656:
657: static void
658: client_process_control(fd_set * readset)
659: {
660: Buffer m;
661: Channel *c;
1.127 djm 662: int client_fd, new_fd[3], ver, i, allowed;
1.123 djm 663: socklen_t addrlen;
664: struct sockaddr_storage addr;
665: struct confirm_ctx *cctx;
666: char *cmd;
1.134 djm 667: u_int len, env_len, command, flags;
1.123 djm 668: uid_t euid;
669: gid_t egid;
670:
671: /*
672: * Accept connection on control socket
673: */
674: if (control_fd == -1 || !FD_ISSET(control_fd, readset))
675: return;
676:
677: memset(&addr, 0, sizeof(addr));
678: addrlen = sizeof(addr);
679: if ((client_fd = accept(control_fd,
680: (struct sockaddr*)&addr, &addrlen)) == -1) {
681: error("%s accept: %s", __func__, strerror(errno));
682: return;
683: }
684:
685: if (getpeereid(client_fd, &euid, &egid) < 0) {
686: error("%s getpeereid failed: %s", __func__, strerror(errno));
687: close(client_fd);
688: return;
689: }
690: if ((euid != 0) && (getuid() != euid)) {
691: error("control mode uid mismatch: peer euid %u != uid %u",
692: (u_int) euid, (u_int) getuid());
693: close(client_fd);
694: return;
695: }
1.127 djm 696:
1.134 djm 697: unset_nonblock(client_fd);
698:
699: /* Read command */
700: buffer_init(&m);
701: if (ssh_msg_recv(client_fd, &m) == -1) {
702: error("%s: client msg_recv failed", __func__);
703: close(client_fd);
704: buffer_free(&m);
705: return;
706: }
707: if ((ver = buffer_get_char(&m)) != 1) {
708: error("%s: wrong client version %d", __func__, ver);
709: buffer_free(&m);
710: close(client_fd);
711: return;
712: }
713:
1.127 djm 714: allowed = 1;
1.134 djm 715: command = buffer_get_int(&m);
716: flags = buffer_get_int(&m);
1.123 djm 717:
1.134 djm 718: buffer_clear(&m);
1.123 djm 719:
1.134 djm 720: switch (command) {
721: case SSHMUX_COMMAND_OPEN:
1.137 djm 722: if (options.control_master == SSHCTL_MASTER_ASK ||
723: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 724: allowed = ask_permission("Allow shared connection "
725: "to %s? ", host);
726: /* continue below */
727: break;
728: case SSHMUX_COMMAND_TERMINATE:
1.137 djm 729: if (options.control_master == SSHCTL_MASTER_ASK ||
730: options.control_master == SSHCTL_MASTER_AUTO_ASK)
1.134 djm 731: allowed = ask_permission("Terminate shared connection "
732: "to %s? ", host);
733: if (allowed)
734: quit_pending = 1;
1.136 deraadt 735: /* FALLTHROUGH */
1.134 djm 736: case SSHMUX_COMMAND_ALIVE_CHECK:
737: /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
738: buffer_clear(&m);
739: buffer_put_int(&m, allowed);
740: buffer_put_int(&m, getpid());
741: if (ssh_msg_send(client_fd, /* version */1, &m) == -1) {
742: error("%s: client msg_send failed", __func__);
743: close(client_fd);
744: buffer_free(&m);
745: return;
746: }
747: buffer_free(&m);
748: close(client_fd);
749: return;
750: default:
751: error("Unsupported command %d", command);
752: buffer_free(&m);
753: close(client_fd);
754: return;
755: }
1.123 djm 756:
1.134 djm 757: /* Reply for SSHMUX_COMMAND_OPEN */
758: buffer_clear(&m);
1.127 djm 759: buffer_put_int(&m, allowed);
1.123 djm 760: buffer_put_int(&m, getpid());
1.134 djm 761: if (ssh_msg_send(client_fd, /* version */1, &m) == -1) {
1.123 djm 762: error("%s: client msg_send failed", __func__);
763: close(client_fd);
1.127 djm 764: buffer_free(&m);
1.123 djm 765: return;
766: }
767:
1.127 djm 768: if (!allowed) {
769: error("Refused control connection");
770: close(client_fd);
771: buffer_free(&m);
772: return;
773: }
774:
1.134 djm 775: buffer_clear(&m);
1.123 djm 776: if (ssh_msg_recv(client_fd, &m) == -1) {
777: error("%s: client msg_recv failed", __func__);
778: close(client_fd);
1.127 djm 779: buffer_free(&m);
1.123 djm 780: return;
781: }
1.134 djm 782: if ((ver = buffer_get_char(&m)) != 1) {
1.123 djm 783: error("%s: wrong client version %d", __func__, ver);
784: buffer_free(&m);
785: close(client_fd);
786: return;
787: }
788:
789: cctx = xmalloc(sizeof(*cctx));
790: memset(cctx, 0, sizeof(*cctx));
1.134 djm 791: cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
792: cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
1.123 djm 793: cctx->term = buffer_get_string(&m, &len);
794:
795: cmd = buffer_get_string(&m, &len);
796: buffer_init(&cctx->cmd);
797: buffer_append(&cctx->cmd, cmd, strlen(cmd));
798:
1.126 djm 799: env_len = buffer_get_int(&m);
800: env_len = MIN(env_len, 4096);
801: debug3("%s: receiving %d env vars", __func__, env_len);
802: if (env_len != 0) {
803: cctx->env = xmalloc(sizeof(*cctx->env) * (env_len + 1));
804: for (i = 0; i < env_len; i++)
805: cctx->env[i] = buffer_get_string(&m, &len);
806: cctx->env[i] = NULL;
807: }
808:
1.123 djm 809: debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
810: cctx->want_tty, cctx->want_subsys, cmd);
811:
812: /* Gather fds from client */
813: new_fd[0] = mm_receive_fd(client_fd);
814: new_fd[1] = mm_receive_fd(client_fd);
815: new_fd[2] = mm_receive_fd(client_fd);
816:
817: debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
818: new_fd[0], new_fd[1], new_fd[2]);
819:
820: /* Try to pick up ttymodes from client before it goes raw */
821: if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
822: error("%s: tcgetattr: %s", __func__, strerror(errno));
823:
1.134 djm 824: /* This roundtrip is just for synchronisation of ttymodes */
1.123 djm 825: buffer_clear(&m);
1.134 djm 826: if (ssh_msg_send(client_fd, /* version */1, &m) == -1) {
1.123 djm 827: error("%s: client msg_send failed", __func__);
828: close(client_fd);
829: close(new_fd[0]);
830: close(new_fd[1]);
831: close(new_fd[2]);
1.127 djm 832: buffer_free(&m);
1.134 djm 833: xfree(cctx->term);
834: if (env_len != 0) {
835: for (i = 0; i < env_len; i++)
836: xfree(cctx->env[i]);
837: xfree(cctx->env);
838: }
1.123 djm 839: return;
840: }
841: buffer_free(&m);
842:
843: /* enable nonblocking unless tty */
844: if (!isatty(new_fd[0]))
845: set_nonblock(new_fd[0]);
846: if (!isatty(new_fd[1]))
847: set_nonblock(new_fd[1]);
848: if (!isatty(new_fd[2]))
849: set_nonblock(new_fd[2]);
850:
851: set_nonblock(client_fd);
852:
1.129 deraadt 853: c = channel_new("session", SSH_CHANNEL_OPENING,
1.123 djm 854: new_fd[0], new_fd[1], new_fd[2],
855: CHAN_SES_WINDOW_DEFAULT, CHAN_SES_PACKET_DEFAULT,
856: CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
857:
858: /* XXX */
859: c->ctl_fd = client_fd;
860:
861: debug3("%s: channel_new: %d", __func__, c->self);
862:
863: channel_send_open(c->self);
864: channel_register_confirm(c->self, client_extra_session2_setup, cctx);
865: }
866:
867: static void
1.99 markus 868: process_cmdline(void)
1.97 jakob 869: {
870: void (*handler)(int);
1.135 djm 871: char *s, *cmd, *cancel_host;
1.121 djm 872: int delete = 0;
1.97 jakob 873: int local = 0;
1.135 djm 874: u_short cancel_port;
875: Forward fwd;
1.97 jakob 876:
877: leave_raw_mode();
1.101 markus 878: handler = signal(SIGINT, SIG_IGN);
1.99 markus 879: cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
1.97 jakob 880: if (s == NULL)
881: goto out;
882: while (*s && isspace(*s))
883: s++;
1.121 djm 884: if (*s == '-')
885: s++; /* Skip cmdline '-', if any */
1.120 dtucker 886: if (*s == '\0')
1.97 jakob 887: goto out;
1.121 djm 888:
1.122 djm 889: if (*s == 'h' || *s == 'H' || *s == '?') {
1.121 djm 890: logit("Commands:");
891: logit(" -Lport:host:hostport Request local forward");
892: logit(" -Rport:host:hostport Request remote forward");
893: logit(" -KRhostport Cancel remote forward");
894: goto out;
895: }
896:
897: if (*s == 'K') {
898: delete = 1;
899: s++;
900: }
901: if (*s != 'L' && *s != 'R') {
1.109 itojun 902: logit("Invalid command.");
1.97 jakob 903: goto out;
904: }
1.121 djm 905: if (*s == 'L')
1.97 jakob 906: local = 1;
1.121 djm 907: if (local && delete) {
908: logit("Not supported.");
909: goto out;
910: }
911: if ((!local || delete) && !compat20) {
1.109 itojun 912: logit("Not supported for SSH protocol version 1.");
1.97 jakob 913: goto out;
914: }
1.121 djm 915:
916: s++;
1.97 jakob 917: while (*s && isspace(*s))
918: s++;
919:
1.121 djm 920: if (delete) {
1.135 djm 921: cancel_port = 0;
922: cancel_host = hpdelim(&s); /* may be NULL */
923: if (s != NULL) {
924: cancel_port = a2port(s);
925: cancel_host = cleanhostname(cancel_host);
926: } else {
927: cancel_port = a2port(cancel_host);
928: cancel_host = NULL;
1.121 djm 929: }
1.135 djm 930: if (cancel_port == 0) {
931: logit("Bad forwarding close port");
1.121 djm 932: goto out;
933: }
1.135 djm 934: channel_request_rforward_cancel(cancel_host, cancel_port);
1.121 djm 935: } else {
1.135 djm 936: if (!parse_forward(&fwd, s)) {
1.121 djm 937: logit("Bad forwarding specification.");
938: goto out;
939: }
940: if (local) {
1.135 djm 941: if (channel_setup_local_fwd_listener(fwd.listen_host,
942: fwd.listen_port, fwd.connect_host,
943: fwd.connect_port, options.gateway_ports) < 0) {
1.121 djm 944: logit("Port forwarding failed.");
945: goto out;
946: }
1.135 djm 947: } else {
948: channel_request_remote_forwarding(fwd.listen_host,
949: fwd.listen_port, fwd.connect_host,
950: fwd.connect_port);
951: }
952:
1.121 djm 953: logit("Forwarding port.");
954: }
955:
1.97 jakob 956: out:
957: signal(SIGINT, handler);
958: enter_raw_mode();
959: if (cmd)
960: xfree(cmd);
961: }
962:
1.31 markus 963: /* process the characters one by one */
1.77 itojun 964: static int
1.31 markus 965: process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
966: {
1.32 markus 967: char string[1024];
1.31 markus 968: pid_t pid;
969: int bytes = 0;
1.42 markus 970: u_int i;
971: u_char ch;
1.31 markus 972: char *s;
973:
974: for (i = 0; i < len; i++) {
975: /* Get one character at a time. */
976: ch = buf[i];
977:
978: if (escape_pending) {
979: /* We have previously seen an escape character. */
980: /* Clear the flag now. */
981: escape_pending = 0;
982:
983: /* Process the escaped character. */
984: switch (ch) {
985: case '.':
986: /* Terminate the connection. */
1.32 markus 987: snprintf(string, sizeof string, "%c.\r\n", escape_char);
988: buffer_append(berr, string, strlen(string));
1.31 markus 989:
990: quit_pending = 1;
991: return -1;
992:
993: case 'Z' - 64:
994: /* Suspend the program. */
995: /* Print a message to that effect to the user. */
1.32 markus 996: snprintf(string, sizeof string, "%c^Z [suspend ssh]\r\n", escape_char);
997: buffer_append(berr, string, strlen(string));
1.31 markus 998:
999: /* Restore terminal modes and suspend. */
1000: client_suspend_self(bin, bout, berr);
1001:
1002: /* We have been continued. */
1003: continue;
1004:
1.111 markus 1005: case 'B':
1006: if (compat20) {
1007: snprintf(string, sizeof string,
1008: "%cB\r\n", escape_char);
1009: buffer_append(berr, string,
1010: strlen(string));
1011: channel_request_start(session_ident,
1012: "break", 0);
1013: packet_put_int(1000);
1014: packet_send();
1015: }
1016: continue;
1017:
1.54 markus 1018: case 'R':
1.59 markus 1019: if (compat20) {
1020: if (datafellows & SSH_BUG_NOREKEY)
1.109 itojun 1021: logit("Server does not support re-keying");
1.59 markus 1022: else
1023: need_rekeying = 1;
1024: }
1.54 markus 1025: continue;
1026:
1.31 markus 1027: case '&':
1028: /*
1029: * Detach the program (continue to serve connections,
1030: * but put in background and no more new connections).
1031: */
1032: /* Restore tty modes. */
1033: leave_raw_mode();
1034:
1035: /* Stop listening for new connections. */
1.86 markus 1036: channel_stop_listening();
1.31 markus 1037:
1.86 markus 1038: snprintf(string, sizeof string,
1039: "%c& [backgrounded]\n", escape_char);
1040: buffer_append(berr, string, strlen(string));
1.31 markus 1041:
1042: /* Fork into background. */
1043: pid = fork();
1044: if (pid < 0) {
1045: error("fork: %.100s", strerror(errno));
1046: continue;
1047: }
1048: if (pid != 0) { /* This is the parent. */
1049: /* The parent just exits. */
1050: exit(0);
1051: }
1052: /* The child continues serving connections. */
1.86 markus 1053: if (compat20) {
1054: buffer_append(bin, "\004", 1);
1055: /* fake EOF on stdin */
1056: return -1;
1057: } else if (!stdin_eof) {
1058: /*
1059: * Sending SSH_CMSG_EOF alone does not always appear
1060: * to be enough. So we try to send an EOF character
1061: * first.
1062: */
1063: packet_start(SSH_CMSG_STDIN_DATA);
1064: packet_put_string("\004", 1);
1065: packet_send();
1066: /* Close stdin. */
1067: stdin_eof = 1;
1068: if (buffer_len(bin) == 0) {
1069: packet_start(SSH_CMSG_EOF);
1070: packet_send();
1071: }
1072: }
1073: continue;
1.31 markus 1074:
1075: case '?':
1.32 markus 1076: snprintf(string, sizeof string,
1.31 markus 1077: "%c?\r\n\
1078: Supported escape sequences:\r\n\
1.104 stevesk 1079: %c. - terminate connection\r\n\
1.111 markus 1080: %cB - send a BREAK to the remote system\r\n\
1.104 stevesk 1081: %cC - open a command line\r\n\
1082: %cR - Request rekey (SSH protocol 2 only)\r\n\
1083: %c^Z - suspend ssh\r\n\
1084: %c# - list forwarded connections\r\n\
1085: %c& - background ssh (when waiting for connections to terminate)\r\n\
1086: %c? - this message\r\n\
1087: %c%c - send the escape character by typing it twice\r\n\
1.31 markus 1088: (Note that escapes are only recognized immediately after newline.)\r\n",
1.104 stevesk 1089: escape_char, escape_char, escape_char, escape_char,
1090: escape_char, escape_char, escape_char, escape_char,
1.111 markus 1091: escape_char, escape_char, escape_char);
1.32 markus 1092: buffer_append(berr, string, strlen(string));
1.31 markus 1093: continue;
1094:
1095: case '#':
1.32 markus 1096: snprintf(string, sizeof string, "%c#\r\n", escape_char);
1097: buffer_append(berr, string, strlen(string));
1.31 markus 1098: s = channel_open_message();
1099: buffer_append(berr, s, strlen(s));
1100: xfree(s);
1.97 jakob 1101: continue;
1102:
1103: case 'C':
1.99 markus 1104: process_cmdline();
1.31 markus 1105: continue;
1106:
1107: default:
1108: if (ch != escape_char) {
1109: buffer_put_char(bin, escape_char);
1110: bytes++;
1111: }
1112: /* Escaped characters fall through here */
1113: break;
1114: }
1115: } else {
1116: /*
1117: * The previous character was not an escape char. Check if this
1118: * is an escape.
1119: */
1120: if (last_was_cr && ch == escape_char) {
1121: /* It is. Set the flag and continue to next character. */
1122: escape_pending = 1;
1123: continue;
1124: }
1125: }
1126:
1127: /*
1128: * Normal character. Record whether it was a newline,
1129: * and append it to the buffer.
1130: */
1131: last_was_cr = (ch == '\r' || ch == '\n');
1132: buffer_put_char(bin, ch);
1133: bytes++;
1134: }
1135: return bytes;
1136: }
1137:
1.77 itojun 1138: static void
1.17 markus 1139: client_process_input(fd_set * readset)
1140: {
1.21 deraadt 1141: int len;
1.31 markus 1142: char buf[8192];
1.16 markus 1143:
1.11 markus 1144: /* Read input from stdin. */
1145: if (FD_ISSET(fileno(stdin), readset)) {
1146: /* Read as much as possible. */
1147: len = read(fileno(stdin), buf, sizeof(buf));
1.64 markus 1148: if (len < 0 && (errno == EAGAIN || errno == EINTR))
1149: return; /* we'll try again later */
1.11 markus 1150: if (len <= 0) {
1.13 markus 1151: /*
1152: * Received EOF or error. They are treated
1153: * similarly, except that an error message is printed
1154: * if it was an error condition.
1155: */
1.11 markus 1156: if (len < 0) {
1157: snprintf(buf, sizeof buf, "read: %.100s\r\n", strerror(errno));
1158: buffer_append(&stderr_buffer, buf, strlen(buf));
1159: }
1160: /* Mark that we have seen EOF. */
1161: stdin_eof = 1;
1.13 markus 1162: /*
1163: * Send an EOF message to the server unless there is
1164: * data in the buffer. If there is data in the
1165: * buffer, no message will be sent now. Code
1166: * elsewhere will send the EOF when the buffer
1167: * becomes empty if stdin_eof is set.
1168: */
1.11 markus 1169: if (buffer_len(&stdin_buffer) == 0) {
1.1 deraadt 1170: packet_start(SSH_CMSG_EOF);
1171: packet_send();
1.11 markus 1172: }
1.72 stevesk 1173: } else if (escape_char == SSH_ESCAPECHAR_NONE) {
1.13 markus 1174: /*
1175: * Normal successful read, and no escape character.
1176: * Just append the data to buffer.
1177: */
1.11 markus 1178: buffer_append(&stdin_buffer, buf, len);
1179: } else {
1.13 markus 1180: /*
1181: * Normal, successful read. But we have an escape character
1182: * and have to process the characters one by one.
1183: */
1.52 markus 1184: if (process_escapes(&stdin_buffer, &stdout_buffer,
1185: &stderr_buffer, buf, len) == -1)
1.31 markus 1186: return;
1.11 markus 1187: }
1188: }
1189: }
1190:
1.77 itojun 1191: static void
1.11 markus 1192: client_process_output(fd_set * writeset)
1193: {
1194: int len;
1195: char buf[100];
1.1 deraadt 1196:
1.11 markus 1197: /* Write buffered output to stdout. */
1198: if (FD_ISSET(fileno(stdout), writeset)) {
1199: /* Write as much data as possible. */
1200: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1201: buffer_len(&stdout_buffer));
1.11 markus 1202: if (len <= 0) {
1.64 markus 1203: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1204: len = 0;
1205: else {
1.13 markus 1206: /*
1207: * An error or EOF was encountered. Put an
1208: * error message to stderr buffer.
1209: */
1.11 markus 1210: snprintf(buf, sizeof buf, "write stdout: %.50s\r\n", strerror(errno));
1211: buffer_append(&stderr_buffer, buf, strlen(buf));
1212: quit_pending = 1;
1213: return;
1214: }
1215: }
1216: /* Consume printed data from the buffer. */
1217: buffer_consume(&stdout_buffer, len);
1.57 markus 1218: stdout_bytes += len;
1.11 markus 1219: }
1220: /* Write buffered output to stderr. */
1221: if (FD_ISSET(fileno(stderr), writeset)) {
1222: /* Write as much data as possible. */
1223: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1224: buffer_len(&stderr_buffer));
1.11 markus 1225: if (len <= 0) {
1.64 markus 1226: if (errno == EINTR || errno == EAGAIN)
1.11 markus 1227: len = 0;
1228: else {
1.13 markus 1229: /* EOF or error, but can't even print error message. */
1.11 markus 1230: quit_pending = 1;
1231: return;
1232: }
1233: }
1234: /* Consume printed characters from the buffer. */
1235: buffer_consume(&stderr_buffer, len);
1.57 markus 1236: stderr_bytes += len;
1.11 markus 1237: }
1.1 deraadt 1238: }
1239:
1.13 markus 1240: /*
1.15 markus 1241: * Get packets from the connection input buffer, and process them as long as
1242: * there are packets available.
1243: *
1244: * Any unknown packets received during the actual
1245: * session cause the session to terminate. This is
1246: * intended to make debugging easier since no
1247: * confirmations are sent. Any compatible protocol
1248: * extensions must be negotiated during the
1249: * preparatory phase.
1250: */
1251:
1.77 itojun 1252: static void
1.49 itojun 1253: client_process_buffered_input_packets(void)
1.15 markus 1254: {
1.54 markus 1255: dispatch_run(DISPATCH_NONBLOCK, &quit_pending, compat20 ? xxx_kex : NULL);
1.15 markus 1256: }
1257:
1.31 markus 1258: /* scan buf[] for '~' before sending data to the peer */
1.30 markus 1259:
1.77 itojun 1260: static int
1.31 markus 1261: simple_escape_filter(Channel *c, char *buf, int len)
1.30 markus 1262: {
1.31 markus 1263: /* XXX we assume c->extended is writeable */
1264: return process_escapes(&c->input, &c->output, &c->extended, buf, len);
1.30 markus 1265: }
1266:
1.77 itojun 1267: static void
1.60 markus 1268: client_channel_closed(int id, void *arg)
1269: {
1.83 markus 1270: channel_cancel_cleanup(id);
1.60 markus 1271: session_closed = 1;
1.113 markus 1272: leave_raw_mode();
1.60 markus 1273: }
1274:
1.15 markus 1275: /*
1.13 markus 1276: * Implements the interactive session with the server. This is called after
1277: * the user has been authenticated, and a command has been started on the
1.72 stevesk 1278: * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character
1279: * used as an escape character for terminating or suspending the session.
1.13 markus 1280: */
1.1 deraadt 1281:
1.20 markus 1282: int
1.30 markus 1283: client_loop(int have_pty, int escape_char_arg, int ssh2_chan_id)
1.1 deraadt 1284: {
1.46 markus 1285: fd_set *readset = NULL, *writeset = NULL;
1.11 markus 1286: double start_time, total_time;
1.130 avsm 1287: int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
1288: u_int nalloc = 0;
1.11 markus 1289: char buf[100];
1290:
1291: debug("Entering interactive session.");
1292:
1293: start_time = get_current_time();
1294:
1295: /* Initialize variables. */
1296: escape_pending = 0;
1297: last_was_cr = 1;
1298: exit_status = -1;
1299: stdin_eof = 0;
1300: buffer_high = 64 * 1024;
1301: connection_in = packet_get_connection_in();
1302: connection_out = packet_get_connection_out();
1.46 markus 1303: max_fd = MAX(connection_in, connection_out);
1.123 djm 1304: if (control_fd != -1)
1305: max_fd = MAX(max_fd, control_fd);
1.46 markus 1306:
1307: if (!compat20) {
1.63 markus 1308: /* enable nonblocking unless tty */
1309: if (!isatty(fileno(stdin)))
1310: set_nonblock(fileno(stdin));
1311: if (!isatty(fileno(stdout)))
1312: set_nonblock(fileno(stdout));
1313: if (!isatty(fileno(stderr)))
1314: set_nonblock(fileno(stderr));
1.46 markus 1315: max_fd = MAX(max_fd, fileno(stdin));
1316: max_fd = MAX(max_fd, fileno(stdout));
1317: max_fd = MAX(max_fd, fileno(stderr));
1318: }
1.11 markus 1319: stdin_bytes = 0;
1320: stdout_bytes = 0;
1321: stderr_bytes = 0;
1322: quit_pending = 0;
1323: escape_char = escape_char_arg;
1324:
1325: /* Initialize buffers. */
1326: buffer_init(&stdin_buffer);
1327: buffer_init(&stdout_buffer);
1328: buffer_init(&stderr_buffer);
1329:
1.15 markus 1330: client_init_dispatch();
1331:
1.105 markus 1332: /*
1333: * Set signal handlers, (e.g. to restore non-blocking mode)
1334: * but don't overwrite SIG_IGN, matches behaviour from rsh(1)
1335: */
1.131 djm 1336: if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
1337: signal(SIGHUP, signal_handler);
1.105 markus 1338: if (signal(SIGINT, SIG_IGN) != SIG_IGN)
1339: signal(SIGINT, signal_handler);
1340: if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
1341: signal(SIGQUIT, signal_handler);
1342: if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
1343: signal(SIGTERM, signal_handler);
1.132 djm 1344: signal(SIGWINCH, window_change_handler);
1.11 markus 1345:
1346: if (have_pty)
1347: enter_raw_mode();
1348:
1.48 markus 1349: if (compat20) {
1350: session_ident = ssh2_chan_id;
1.72 stevesk 1351: if (escape_char != SSH_ESCAPECHAR_NONE)
1.48 markus 1352: channel_register_filter(session_ident,
1353: simple_escape_filter);
1.60 markus 1354: if (session_ident != -1)
1355: channel_register_cleanup(session_ident,
1356: client_channel_closed);
1.48 markus 1357: } else {
1358: /* Check if we should immediately send eof on stdin. */
1.16 markus 1359: client_check_initial_eof_on_stdin();
1.48 markus 1360: }
1.30 markus 1361:
1.11 markus 1362: /* Main loop of the client for the interactive session mode. */
1363: while (!quit_pending) {
1364:
1.13 markus 1365: /* Process buffered packets sent by the server. */
1.11 markus 1366: client_process_buffered_input_packets();
1367:
1.60 markus 1368: if (compat20 && session_closed && !channel_still_open())
1369: break;
1370:
1.56 markus 1371: rekeying = (xxx_kex != NULL && !xxx_kex->done);
1.16 markus 1372:
1.56 markus 1373: if (rekeying) {
1374: debug("rekeying in progress");
1375: } else {
1376: /*
1377: * Make packets of buffered stdin data, and buffer
1378: * them for sending to the server.
1379: */
1380: if (!compat20)
1381: client_make_packets_from_stdin_data();
1.11 markus 1382:
1.56 markus 1383: /*
1384: * Make packets from buffered channel data, and
1385: * enqueue them for sending to the server.
1386: */
1387: if (packet_not_very_much_data_to_write())
1388: channel_output_poll();
1.11 markus 1389:
1.56 markus 1390: /*
1391: * Check if the window size has changed, and buffer a
1392: * message about it to the server if so.
1393: */
1394: client_check_window_change();
1.11 markus 1395:
1.56 markus 1396: if (quit_pending)
1397: break;
1398: }
1.13 markus 1399: /*
1400: * Wait until we have something to do (something becomes
1401: * available on one of the descriptors).
1402: */
1.81 markus 1403: max_fd2 = max_fd;
1.56 markus 1404: client_wait_until_can_do_something(&readset, &writeset,
1.81 markus 1405: &max_fd2, &nalloc, rekeying);
1.11 markus 1406:
1407: if (quit_pending)
1408: break;
1409:
1.56 markus 1410: /* Do channel operations unless rekeying in progress. */
1411: if (!rekeying) {
1412: channel_after_select(readset, writeset);
1.108 markus 1413: if (need_rekeying || packet_need_rekeying()) {
1414: debug("need rekeying");
1.56 markus 1415: xxx_kex->done = 0;
1416: kex_send_kexinit(xxx_kex);
1417: need_rekeying = 0;
1418: }
1419: }
1.11 markus 1420:
1.17 markus 1421: /* Buffer input from the connection. */
1.46 markus 1422: client_process_net_input(readset);
1.17 markus 1423:
1.123 djm 1424: /* Accept control connections. */
1425: client_process_control(readset);
1426:
1.17 markus 1427: if (quit_pending)
1428: break;
1.11 markus 1429:
1.17 markus 1430: if (!compat20) {
1431: /* Buffer data from stdin */
1.46 markus 1432: client_process_input(readset);
1.17 markus 1433: /*
1434: * Process output to stdout and stderr. Output to
1435: * the connection is processed elsewhere (above).
1436: */
1.46 markus 1437: client_process_output(writeset);
1.17 markus 1438: }
1.11 markus 1439:
1.13 markus 1440: /* Send as much buffered packet data as possible to the sender. */
1.46 markus 1441: if (FD_ISSET(connection_out, writeset))
1.11 markus 1442: packet_write_poll();
1443: }
1.46 markus 1444: if (readset)
1445: xfree(readset);
1446: if (writeset)
1447: xfree(writeset);
1.11 markus 1448:
1449: /* Terminate the session. */
1450:
1451: /* Stop watching for window change. */
1.132 djm 1452: signal(SIGWINCH, SIG_DFL);
1.11 markus 1453:
1.76 markus 1454: channel_free_all();
1.11 markus 1455:
1.75 markus 1456: if (have_pty)
1457: leave_raw_mode();
1458:
1459: /* restore blocking io */
1460: if (!isatty(fileno(stdin)))
1461: unset_nonblock(fileno(stdin));
1462: if (!isatty(fileno(stdout)))
1463: unset_nonblock(fileno(stdout));
1464: if (!isatty(fileno(stderr)))
1465: unset_nonblock(fileno(stderr));
1.116 dtucker 1466:
1467: /*
1468: * If there was no shell or command requested, there will be no remote
1469: * exit status to be returned. In that case, clear error code if the
1470: * connection was deliberately terminated at this end.
1471: */
1472: if (no_shell_flag && received_signal == SIGTERM) {
1473: received_signal = 0;
1474: exit_status = 0;
1475: }
1.75 markus 1476:
1.113 markus 1477: if (received_signal)
1.89 itojun 1478: fatal("Killed by signal %d.", (int) received_signal);
1.75 markus 1479:
1.13 markus 1480: /*
1481: * In interactive mode (with pseudo tty) display a message indicating
1482: * that the connection has been closed.
1483: */
1.11 markus 1484: if (have_pty && options.log_level != SYSLOG_LEVEL_QUIET) {
1485: snprintf(buf, sizeof buf, "Connection to %.64s closed.\r\n", host);
1486: buffer_append(&stderr_buffer, buf, strlen(buf));
1487: }
1.70 markus 1488:
1.11 markus 1489: /* Output any buffered data for stdout. */
1.70 markus 1490: while (buffer_len(&stdout_buffer) > 0) {
1491: len = write(fileno(stdout), buffer_ptr(&stdout_buffer),
1.14 deraadt 1492: buffer_len(&stdout_buffer));
1.70 markus 1493: if (len <= 0) {
1.11 markus 1494: error("Write failed flushing stdout buffer.");
1.70 markus 1495: break;
1496: }
1.11 markus 1497: buffer_consume(&stdout_buffer, len);
1.57 markus 1498: stdout_bytes += len;
1.11 markus 1499: }
1500:
1501: /* Output any buffered data for stderr. */
1.70 markus 1502: while (buffer_len(&stderr_buffer) > 0) {
1503: len = write(fileno(stderr), buffer_ptr(&stderr_buffer),
1.14 deraadt 1504: buffer_len(&stderr_buffer));
1.70 markus 1505: if (len <= 0) {
1.11 markus 1506: error("Write failed flushing stderr buffer.");
1.70 markus 1507: break;
1508: }
1.11 markus 1509: buffer_consume(&stderr_buffer, len);
1.57 markus 1510: stderr_bytes += len;
1.11 markus 1511: }
1512:
1513: /* Clear and free any buffers. */
1514: memset(buf, 0, sizeof(buf));
1515: buffer_free(&stdin_buffer);
1516: buffer_free(&stdout_buffer);
1517: buffer_free(&stderr_buffer);
1518:
1519: /* Report bytes transferred, and transfer rates. */
1520: total_time = get_current_time() - start_time;
1521: debug("Transferred: stdin %lu, stdout %lu, stderr %lu bytes in %.1f seconds",
1.90 deraadt 1522: stdin_bytes, stdout_bytes, stderr_bytes, total_time);
1.11 markus 1523: if (total_time > 0)
1524: debug("Bytes per second: stdin %.1f, stdout %.1f, stderr %.1f",
1.90 deraadt 1525: stdin_bytes / total_time, stdout_bytes / total_time,
1526: stderr_bytes / total_time);
1.11 markus 1527:
1528: /* Return the exit status of the program. */
1529: debug("Exit status %d", exit_status);
1530: return exit_status;
1.15 markus 1531: }
1532:
1533: /*********/
1534:
1.77 itojun 1535: static void
1.94 markus 1536: client_input_stdout_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1537: {
1.42 markus 1538: u_int data_len;
1.15 markus 1539: char *data = packet_get_string(&data_len);
1.93 markus 1540: packet_check_eom();
1.15 markus 1541: buffer_append(&stdout_buffer, data, data_len);
1542: memset(data, 0, data_len);
1543: xfree(data);
1544: }
1.77 itojun 1545: static void
1.94 markus 1546: client_input_stderr_data(int type, u_int32_t seq, void *ctxt)
1.15 markus 1547: {
1.42 markus 1548: u_int data_len;
1.15 markus 1549: char *data = packet_get_string(&data_len);
1.93 markus 1550: packet_check_eom();
1.15 markus 1551: buffer_append(&stderr_buffer, data, data_len);
1552: memset(data, 0, data_len);
1553: xfree(data);
1554: }
1.77 itojun 1555: static void
1.94 markus 1556: client_input_exit_status(int type, u_int32_t seq, void *ctxt)
1.15 markus 1557: {
1558: exit_status = packet_get_int();
1.93 markus 1559: packet_check_eom();
1.15 markus 1560: /* Acknowledge the exit. */
1561: packet_start(SSH_CMSG_EXIT_CONFIRMATION);
1562: packet_send();
1563: /*
1564: * Must wait for packet to be sent since we are
1565: * exiting the loop.
1566: */
1567: packet_write_wait();
1568: /* Flag that we want to exit. */
1569: quit_pending = 1;
1570: }
1.115 markus 1571: static void
1572: client_input_agent_open(int type, u_int32_t seq, void *ctxt)
1573: {
1574: Channel *c = NULL;
1575: int remote_id, sock;
1576:
1577: /* Read the remote channel number from the message. */
1578: remote_id = packet_get_int();
1579: packet_check_eom();
1580:
1581: /*
1582: * Get a connection to the local authentication agent (this may again
1583: * get forwarded).
1584: */
1585: sock = ssh_get_authentication_socket();
1586:
1587: /*
1588: * If we could not connect the agent, send an error message back to
1589: * the server. This should never happen unless the agent dies,
1590: * because authentication forwarding is only enabled if we have an
1591: * agent.
1592: */
1593: if (sock >= 0) {
1594: c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
1595: -1, 0, 0, 0, "authentication agent connection", 1);
1596: c->remote_id = remote_id;
1597: c->force_drain = 1;
1598: }
1599: if (c == NULL) {
1600: packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1601: packet_put_int(remote_id);
1602: } else {
1603: /* Send a confirmation to the remote host. */
1604: debug("Forwarding authentication connection.");
1605: packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1606: packet_put_int(remote_id);
1607: packet_put_int(c->self);
1608: }
1609: packet_send();
1610: }
1.15 markus 1611:
1.77 itojun 1612: static Channel *
1.40 markus 1613: client_request_forwarded_tcpip(const char *request_type, int rchan)
1614: {
1.103 deraadt 1615: Channel *c = NULL;
1.40 markus 1616: char *listen_address, *originator_address;
1617: int listen_port, originator_port;
1.67 markus 1618: int sock;
1.40 markus 1619:
1620: /* Get rest of the packet */
1621: listen_address = packet_get_string(NULL);
1622: listen_port = packet_get_int();
1623: originator_address = packet_get_string(NULL);
1624: originator_port = packet_get_int();
1.93 markus 1625: packet_check_eom();
1.40 markus 1626:
1627: debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
1628: listen_address, listen_port, originator_address, originator_port);
1629:
1.80 stevesk 1630: sock = channel_connect_by_listen_address(listen_port);
1.67 markus 1631: if (sock < 0) {
1632: xfree(originator_address);
1633: xfree(listen_address);
1634: return NULL;
1635: }
1636: c = channel_new("forwarded-tcpip",
1637: SSH_CHANNEL_CONNECTING, sock, sock, -1,
1638: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1639: originator_address, 1);
1.40 markus 1640: xfree(originator_address);
1641: xfree(listen_address);
1642: return c;
1643: }
1644:
1.103 deraadt 1645: static Channel *
1.40 markus 1646: client_request_x11(const char *request_type, int rchan)
1647: {
1648: Channel *c = NULL;
1649: char *originator;
1650: int originator_port;
1.67 markus 1651: int sock;
1.40 markus 1652:
1653: if (!options.forward_x11) {
1654: error("Warning: ssh server tried X11 forwarding.");
1655: error("Warning: this is probably a break in attempt by a malicious server.");
1656: return NULL;
1657: }
1658: originator = packet_get_string(NULL);
1659: if (datafellows & SSH_BUG_X11FWD) {
1660: debug2("buggy server: x11 request w/o originator_port");
1661: originator_port = 0;
1662: } else {
1663: originator_port = packet_get_int();
1664: }
1.93 markus 1665: packet_check_eom();
1.40 markus 1666: /* XXX check permission */
1.47 markus 1667: debug("client_request_x11: request from %s %d", originator,
1668: originator_port);
1.67 markus 1669: xfree(originator);
1.40 markus 1670: sock = x11_connect_display();
1.67 markus 1671: if (sock < 0)
1672: return NULL;
1673: c = channel_new("x11",
1674: SSH_CHANNEL_X11_OPEN, sock, sock, -1,
1.110 markus 1675: CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
1.82 markus 1676: c->force_drain = 1;
1.40 markus 1677: return c;
1678: }
1679:
1.103 deraadt 1680: static Channel *
1.40 markus 1681: client_request_agent(const char *request_type, int rchan)
1682: {
1683: Channel *c = NULL;
1.67 markus 1684: int sock;
1.40 markus 1685:
1686: if (!options.forward_agent) {
1687: error("Warning: ssh server tried agent forwarding.");
1688: error("Warning: this is probably a break in attempt by a malicious server.");
1689: return NULL;
1690: }
1691: sock = ssh_get_authentication_socket();
1.67 markus 1692: if (sock < 0)
1693: return NULL;
1694: c = channel_new("authentication agent connection",
1695: SSH_CHANNEL_OPEN, sock, sock, -1,
1696: CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
1.110 markus 1697: "authentication agent connection", 1);
1.82 markus 1698: c->force_drain = 1;
1.40 markus 1699: return c;
1700: }
1701:
1.22 markus 1702: /* XXXX move to generic input handler */
1.77 itojun 1703: static void
1.94 markus 1704: client_input_channel_open(int type, u_int32_t seq, void *ctxt)
1.22 markus 1705: {
1706: Channel *c = NULL;
1707: char *ctype;
1708: int rchan;
1.102 markus 1709: u_int rmaxpack, rwindow, len;
1.22 markus 1710:
1711: ctype = packet_get_string(&len);
1712: rchan = packet_get_int();
1713: rwindow = packet_get_int();
1714: rmaxpack = packet_get_int();
1715:
1.24 markus 1716: debug("client_input_channel_open: ctype %s rchan %d win %d max %d",
1.22 markus 1717: ctype, rchan, rwindow, rmaxpack);
1718:
1.40 markus 1719: if (strcmp(ctype, "forwarded-tcpip") == 0) {
1720: c = client_request_forwarded_tcpip(ctype, rchan);
1721: } else if (strcmp(ctype, "x11") == 0) {
1722: c = client_request_x11(ctype, rchan);
1723: } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) {
1724: c = client_request_agent(ctype, rchan);
1.22 markus 1725: }
1726: /* XXX duplicate : */
1727: if (c != NULL) {
1728: debug("confirm %s", ctype);
1729: c->remote_id = rchan;
1730: c->remote_window = rwindow;
1731: c->remote_maxpacket = rmaxpack;
1.69 markus 1732: if (c->type != SSH_CHANNEL_CONNECTING) {
1733: packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1734: packet_put_int(c->remote_id);
1735: packet_put_int(c->self);
1736: packet_put_int(c->local_window);
1737: packet_put_int(c->local_maxpacket);
1738: packet_send();
1739: }
1.22 markus 1740: } else {
1741: debug("failure %s", ctype);
1742: packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1743: packet_put_int(rchan);
1744: packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
1.66 markus 1745: if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1.69 markus 1746: packet_put_cstring("open failed");
1.66 markus 1747: packet_put_cstring("");
1748: }
1.22 markus 1749: packet_send();
1750: }
1751: xfree(ctype);
1752: }
1.77 itojun 1753: static void
1.94 markus 1754: client_input_channel_req(int type, u_int32_t seq, void *ctxt)
1.48 markus 1755: {
1756: Channel *c = NULL;
1.123 djm 1757: int exitval, id, reply, success = 0;
1.48 markus 1758: char *rtype;
1759:
1760: id = packet_get_int();
1761: rtype = packet_get_string(NULL);
1762: reply = packet_get_char();
1763:
1764: debug("client_input_channel_req: channel %d rtype %s reply %d",
1765: id, rtype, reply);
1766:
1.128 djm 1767: if (id == -1) {
1768: error("client_input_channel_req: request for channel -1");
1769: } else if ((c = channel_lookup(id)) == NULL) {
1.48 markus 1770: error("client_input_channel_req: channel %d: unknown channel", id);
1771: } else if (strcmp(rtype, "exit-status") == 0) {
1.123 djm 1772: exitval = packet_get_int();
1773: if (id == session_ident) {
1774: success = 1;
1775: exit_status = exitval;
1776: } else if (c->ctl_fd == -1) {
1777: error("client_input_channel_req: unexpected channel %d",
1778: session_ident);
1779: } else {
1780: atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
1781: success = 1;
1782: }
1.93 markus 1783: packet_check_eom();
1.48 markus 1784: }
1785: if (reply) {
1786: packet_start(success ?
1787: SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1.128 djm 1788: packet_put_int(id);
1.48 markus 1789: packet_send();
1790: }
1791: xfree(rtype);
1792: }
1.95 markus 1793: static void
1794: client_input_global_request(int type, u_int32_t seq, void *ctxt)
1795: {
1796: char *rtype;
1797: int want_reply;
1798: int success = 0;
1799:
1800: rtype = packet_get_string(NULL);
1801: want_reply = packet_get_char();
1.117 markus 1802: debug("client_input_global_request: rtype %s want_reply %d",
1803: rtype, want_reply);
1.95 markus 1804: if (want_reply) {
1805: packet_start(success ?
1806: SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
1807: packet_send();
1808: packet_write_wait();
1809: }
1810: xfree(rtype);
1811: }
1.22 markus 1812:
1.123 djm 1813: void
1.129 deraadt 1814: client_session2_setup(int id, int want_tty, int want_subsystem,
1.126 djm 1815: const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
1.123 djm 1816: dispatch_fn *subsys_repl)
1817: {
1818: int len;
1.132 djm 1819: Channel *c = NULL;
1.123 djm 1820:
1821: debug2("%s: id %d", __func__, id);
1822:
1.132 djm 1823: if ((c = channel_lookup(id)) == NULL)
1824: fatal("client_session2_setup: channel %d: unknown channel", id);
1825:
1.123 djm 1826: if (want_tty) {
1827: struct winsize ws;
1828: struct termios tio;
1829:
1830: /* Store window size in the packet. */
1831: if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
1832: memset(&ws, 0, sizeof(ws));
1833:
1834: channel_request_start(id, "pty-req", 0);
1835: packet_put_cstring(term != NULL ? term : "");
1836: packet_put_int(ws.ws_col);
1837: packet_put_int(ws.ws_row);
1838: packet_put_int(ws.ws_xpixel);
1839: packet_put_int(ws.ws_ypixel);
1840: tio = get_saved_tio();
1841: tty_make_modes(-1, tiop != NULL ? tiop : &tio);
1842: packet_send();
1843: /* XXX wait for reply */
1.132 djm 1844: c->client_tty = 1;
1.123 djm 1845: }
1846:
1847: /* Transfer any environment variables from client to server */
1.126 djm 1848: if (options.num_send_env != 0 && env != NULL) {
1.123 djm 1849: int i, j, matched;
1850: char *name, *val;
1851:
1852: debug("Sending environment.");
1.126 djm 1853: for (i = 0; env[i] != NULL; i++) {
1.123 djm 1854: /* Split */
1.126 djm 1855: name = xstrdup(env[i]);
1.123 djm 1856: if ((val = strchr(name, '=')) == NULL) {
1857: free(name);
1858: continue;
1859: }
1860: *val++ = '\0';
1861:
1862: matched = 0;
1863: for (j = 0; j < options.num_send_env; j++) {
1864: if (match_pattern(name, options.send_env[j])) {
1865: matched = 1;
1866: break;
1867: }
1868: }
1869: if (!matched) {
1870: debug3("Ignored env %s", name);
1871: free(name);
1872: continue;
1873: }
1874:
1875: debug("Sending env %s = %s", name, val);
1876: channel_request_start(id, "env", 0);
1877: packet_put_cstring(name);
1878: packet_put_cstring(val);
1879: packet_send();
1880: free(name);
1881: }
1882: }
1883:
1884: len = buffer_len(cmd);
1885: if (len > 0) {
1886: if (len > 900)
1887: len = 900;
1888: if (want_subsystem) {
1889: debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
1890: channel_request_start(id, "subsystem", subsys_repl != NULL);
1891: if (subsys_repl != NULL) {
1892: /* register callback for reply */
1893: /* XXX we assume that client_loop has already been called */
1894: dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
1895: dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
1896: }
1897: } else {
1898: debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
1899: channel_request_start(id, "exec", 0);
1900: }
1901: packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
1902: packet_send();
1903: } else {
1904: channel_request_start(id, "shell", 0);
1905: packet_send();
1906: }
1907: }
1908:
1.77 itojun 1909: static void
1.49 itojun 1910: client_init_dispatch_20(void)
1.16 markus 1911: {
1.55 markus 1912: dispatch_init(&dispatch_protocol_error);
1.100 markus 1913:
1.16 markus 1914: dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1915: dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1916: dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1917: dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1.22 markus 1918: dispatch_set(SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
1.16 markus 1919: dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1920: dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1.48 markus 1921: dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &client_input_channel_req);
1.16 markus 1922: dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
1.95 markus 1923: dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &client_input_global_request);
1.55 markus 1924:
1925: /* rekeying */
1926: dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
1.100 markus 1927:
1928: /* global request reply messages */
1929: dispatch_set(SSH2_MSG_REQUEST_FAILURE, &client_global_request_reply);
1930: dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &client_global_request_reply);
1.16 markus 1931: }
1.77 itojun 1932: static void
1.49 itojun 1933: client_init_dispatch_13(void)
1.15 markus 1934: {
1935: dispatch_init(NULL);
1936: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1937: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1938: dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1939: dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1940: dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1941: dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1942: dispatch_set(SSH_SMSG_EXITSTATUS, &client_input_exit_status);
1943: dispatch_set(SSH_SMSG_STDERR_DATA, &client_input_stderr_data);
1944: dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
1.39 markus 1945:
1946: dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
1.115 markus 1947: &client_input_agent_open : &deny_input_open);
1.39 markus 1948: dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
1949: &x11_input_open : &deny_input_open);
1.15 markus 1950: }
1.77 itojun 1951: static void
1.49 itojun 1952: client_init_dispatch_15(void)
1.15 markus 1953: {
1954: client_init_dispatch_13();
1955: dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1956: dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, & channel_input_oclose);
1957: }
1.79 stevesk 1958: static void
1.49 itojun 1959: client_init_dispatch(void)
1.15 markus 1960: {
1.16 markus 1961: if (compat20)
1962: client_init_dispatch_20();
1963: else if (compat13)
1.15 markus 1964: client_init_dispatch_13();
1965: else
1966: client_init_dispatch_15();
1.113 markus 1967: }
1968:
1969: /* client specific fatal cleanup */
1970: void
1.114 markus 1971: cleanup_exit(int i)
1.113 markus 1972: {
1973: leave_raw_mode();
1974: leave_non_blocking();
1.123 djm 1975: if (options.control_path != NULL && control_fd != -1)
1976: unlink(options.control_path);
1.114 markus 1977: _exit(i);
1.1 deraadt 1978: }
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