| File: | src/usr.bin/ssh/ssh/../clientloop.c |
| Warning: | line 2416, column 7 Although the value stored to 'r' is used in the enclosing expression, the value is never actually read from 'r' |
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| 1 | /* $OpenBSD: clientloop.c,v 1.402 2023/11/24 00:31:30 dtucker Exp $ */ |
| 2 | /* |
| 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 5 | * All rights reserved |
| 6 | * The main loop for the interactive session (client side). |
| 7 | * |
| 8 | * As far as I am concerned, the code I have written for this software |
| 9 | * can be used freely for any purpose. Any derived versions of this |
| 10 | * software must be clearly marked as such, and if the derived work is |
| 11 | * incompatible with the protocol description in the RFC file, it must be |
| 12 | * called by a name other than "ssh" or "Secure Shell". |
| 13 | * |
| 14 | * |
| 15 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. |
| 16 | * |
| 17 | * Redistribution and use in source and binary forms, with or without |
| 18 | * modification, are permitted provided that the following conditions |
| 19 | * are met: |
| 20 | * 1. Redistributions of source code must retain the above copyright |
| 21 | * notice, this list of conditions and the following disclaimer. |
| 22 | * 2. Redistributions in binary form must reproduce the above copyright |
| 23 | * notice, this list of conditions and the following disclaimer in the |
| 24 | * documentation and/or other materials provided with the distribution. |
| 25 | * |
| 26 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 27 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 28 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 29 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 30 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 31 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 32 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 33 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 34 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 35 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 36 | * |
| 37 | * |
| 38 | * SSH2 support added by Markus Friedl. |
| 39 | * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved. |
| 40 | * |
| 41 | * Redistribution and use in source and binary forms, with or without |
| 42 | * modification, are permitted provided that the following conditions |
| 43 | * are met: |
| 44 | * 1. Redistributions of source code must retain the above copyright |
| 45 | * notice, this list of conditions and the following disclaimer. |
| 46 | * 2. Redistributions in binary form must reproduce the above copyright |
| 47 | * notice, this list of conditions and the following disclaimer in the |
| 48 | * documentation and/or other materials provided with the distribution. |
| 49 | * |
| 50 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 51 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 52 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 53 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 54 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 55 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 56 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 57 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 58 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 59 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 60 | */ |
| 61 | |
| 62 | |
| 63 | #include <sys/types.h> |
| 64 | #include <sys/ioctl.h> |
| 65 | #include <sys/stat.h> |
| 66 | #include <sys/socket.h> |
| 67 | #include <sys/time.h> |
| 68 | #include <sys/queue.h> |
| 69 | |
| 70 | #include <ctype.h> |
| 71 | #include <errno(*__errno()).h> |
| 72 | #include <paths.h> |
| 73 | #include <poll.h> |
| 74 | #include <signal.h> |
| 75 | #include <stdio.h> |
| 76 | #include <stdlib.h> |
| 77 | #include <string.h> |
| 78 | #include <stdarg.h> |
| 79 | #include <termios.h> |
| 80 | #include <pwd.h> |
| 81 | #include <unistd.h> |
| 82 | #include <limits.h> |
| 83 | |
| 84 | #include "xmalloc.h" |
| 85 | #include "ssh.h" |
| 86 | #include "ssh2.h" |
| 87 | #include "packet.h" |
| 88 | #include "sshbuf.h" |
| 89 | #include "compat.h" |
| 90 | #include "channels.h" |
| 91 | #include "dispatch.h" |
| 92 | #include "sshkey.h" |
| 93 | #include "cipher.h" |
| 94 | #include "kex.h" |
| 95 | #include "myproposal.h" |
| 96 | #include "log.h" |
| 97 | #include "misc.h" |
| 98 | #include "readconf.h" |
| 99 | #include "clientloop.h" |
| 100 | #include "sshconnect.h" |
| 101 | #include "authfd.h" |
| 102 | #include "atomicio.h" |
| 103 | #include "sshpty.h" |
| 104 | #include "match.h" |
| 105 | #include "msg.h" |
| 106 | #include "ssherr.h" |
| 107 | #include "hostfile.h" |
| 108 | |
| 109 | /* Permitted RSA signature algorithms for UpdateHostkeys proofs */ |
| 110 | #define HOSTKEY_PROOF_RSA_ALGS"rsa-sha2-512,rsa-sha2-256" "rsa-sha2-512,rsa-sha2-256" |
| 111 | |
| 112 | /* Uncertainty (in percent) of keystroke timing intervals */ |
| 113 | #define SSH_KEYSTROKE_TIMING_FUZZ10 10 |
| 114 | |
| 115 | /* import options */ |
| 116 | extern Options options; |
| 117 | |
| 118 | /* Control socket */ |
| 119 | extern int muxserver_sock; /* XXX use mux_client_cleanup() instead */ |
| 120 | |
| 121 | /* |
| 122 | * Name of the host we are connecting to. This is the name given on the |
| 123 | * command line, or the Hostname specified for the user-supplied name in a |
| 124 | * configuration file. |
| 125 | */ |
| 126 | extern char *host; |
| 127 | |
| 128 | /* |
| 129 | * If this field is not NULL, the ForwardAgent socket is this path and different |
| 130 | * instead of SSH_AUTH_SOCK. |
| 131 | */ |
| 132 | extern char *forward_agent_sock_path; |
| 133 | |
| 134 | /* |
| 135 | * Flag to indicate that we have received a window change signal which has |
| 136 | * not yet been processed. This will cause a message indicating the new |
| 137 | * window size to be sent to the server a little later. This is volatile |
| 138 | * because this is updated in a signal handler. |
| 139 | */ |
| 140 | static volatile sig_atomic_t received_window_change_signal = 0; |
| 141 | static volatile sig_atomic_t received_signal = 0; |
| 142 | |
| 143 | /* Time when backgrounded control master using ControlPersist should exit */ |
| 144 | static time_t control_persist_exit_time = 0; |
| 145 | |
| 146 | /* Common data for the client loop code. */ |
| 147 | volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */ |
| 148 | static int last_was_cr; /* Last character was a newline. */ |
| 149 | static int exit_status; /* Used to store the command exit status. */ |
| 150 | static struct sshbuf *stderr_buffer; /* Used for final exit message. */ |
| 151 | static int connection_in; /* Connection to server (input). */ |
| 152 | static int connection_out; /* Connection to server (output). */ |
| 153 | static int need_rekeying; /* Set to non-zero if rekeying is requested. */ |
| 154 | static int session_closed; /* In SSH2: login session closed. */ |
| 155 | static time_t x11_refuse_time; /* If >0, refuse x11 opens after this time. */ |
| 156 | static time_t server_alive_time; /* Time to do server_alive_check */ |
| 157 | static int hostkeys_update_complete; |
| 158 | static int session_setup_complete; |
| 159 | |
| 160 | static void client_init_dispatch(struct ssh *ssh); |
| 161 | int session_ident = -1; |
| 162 | |
| 163 | /* Track escape per proto2 channel */ |
| 164 | struct escape_filter_ctx { |
| 165 | int escape_pending; |
| 166 | int escape_char; |
| 167 | }; |
| 168 | |
| 169 | /* Context for channel confirmation replies */ |
| 170 | struct channel_reply_ctx { |
| 171 | const char *request_type; |
| 172 | int id; |
| 173 | enum confirm_action action; |
| 174 | }; |
| 175 | |
| 176 | /* Global request success/failure callbacks */ |
| 177 | /* XXX move to struct ssh? */ |
| 178 | struct global_confirm { |
| 179 | TAILQ_ENTRY(global_confirm)struct { struct global_confirm *tqe_next; struct global_confirm **tqe_prev; } entry; |
| 180 | global_confirm_cb *cb; |
| 181 | void *ctx; |
| 182 | int ref_count; |
| 183 | }; |
| 184 | TAILQ_HEAD(global_confirms, global_confirm)struct global_confirms { struct global_confirm *tqh_first; struct global_confirm **tqh_last; }; |
| 185 | static struct global_confirms global_confirms = |
| 186 | TAILQ_HEAD_INITIALIZER(global_confirms){ ((void *)0), &(global_confirms).tqh_first }; |
| 187 | |
| 188 | void ssh_process_session2_setup(int, int, int, struct sshbuf *); |
| 189 | static void quit_message(const char *fmt, ...) |
| 190 | __attribute__((__format__ (printf, 1, 2))); |
| 191 | |
| 192 | static void |
| 193 | quit_message(const char *fmt, ...) |
| 194 | { |
| 195 | char *msg; |
| 196 | va_list args; |
| 197 | int r; |
| 198 | |
| 199 | va_start(args, fmt)__builtin_va_start((args), fmt); |
| 200 | xvasprintf(&msg, fmt, args); |
| 201 | va_end(args)__builtin_va_end((args)); |
| 202 | |
| 203 | if ((r = sshbuf_putf(stderr_buffer, "%s\r\n", msg)) != 0) |
| 204 | fatal_fr(r, "sshbuf_putf")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 204, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_putf"); |
| 205 | free(msg); |
| 206 | quit_pending = 1; |
| 207 | } |
| 208 | |
| 209 | /* |
| 210 | * Signal handler for the window change signal (SIGWINCH). This just sets a |
| 211 | * flag indicating that the window has changed. |
| 212 | */ |
| 213 | static void |
| 214 | window_change_handler(int sig) |
| 215 | { |
| 216 | received_window_change_signal = 1; |
| 217 | } |
| 218 | |
| 219 | /* |
| 220 | * Signal handler for signals that cause the program to terminate. These |
| 221 | * signals must be trapped to restore terminal modes. |
| 222 | */ |
| 223 | static void |
| 224 | signal_handler(int sig) |
| 225 | { |
| 226 | received_signal = sig; |
| 227 | quit_pending = 1; |
| 228 | } |
| 229 | |
| 230 | /* |
| 231 | * Sets control_persist_exit_time to the absolute time when the |
| 232 | * backgrounded control master should exit due to expiry of the |
| 233 | * ControlPersist timeout. Sets it to 0 if we are not a backgrounded |
| 234 | * control master process, or if there is no ControlPersist timeout. |
| 235 | */ |
| 236 | static void |
| 237 | set_control_persist_exit_time(struct ssh *ssh) |
| 238 | { |
| 239 | if (muxserver_sock == -1 || !options.control_persist |
| 240 | || options.control_persist_timeout == 0) { |
| 241 | /* not using a ControlPersist timeout */ |
| 242 | control_persist_exit_time = 0; |
| 243 | } else if (channel_still_open(ssh)) { |
| 244 | /* some client connections are still open */ |
| 245 | if (control_persist_exit_time > 0) |
| 246 | debug2_f("cancel scheduled exit")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 246 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "cancel scheduled exit" ); |
| 247 | control_persist_exit_time = 0; |
| 248 | } else if (control_persist_exit_time <= 0) { |
| 249 | /* a client connection has recently closed */ |
| 250 | control_persist_exit_time = monotime() + |
| 251 | (time_t)options.control_persist_timeout; |
| 252 | debug2_f("schedule exit in %d seconds",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 253 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "schedule exit in %d seconds" , options.control_persist_timeout) |
| 253 | options.control_persist_timeout)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 253 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "schedule exit in %d seconds" , options.control_persist_timeout); |
| 254 | } |
| 255 | /* else we are already counting down to the timeout */ |
| 256 | } |
| 257 | |
| 258 | #define SSH_X11_VALID_DISPLAY_CHARS":/.-_" ":/.-_" |
| 259 | static int |
| 260 | client_x11_display_valid(const char *display) |
| 261 | { |
| 262 | size_t i, dlen; |
| 263 | |
| 264 | if (display == NULL((void *)0)) |
| 265 | return 0; |
| 266 | |
| 267 | dlen = strlen(display); |
| 268 | for (i = 0; i < dlen; i++) { |
| 269 | if (!isalnum((u_char)display[i]) && |
| 270 | strchr(SSH_X11_VALID_DISPLAY_CHARS":/.-_", display[i]) == NULL((void *)0)) { |
| 271 | debug("Invalid character '%c' in DISPLAY", display[i])sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 271 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Invalid character '%c' in DISPLAY" , display[i]); |
| 272 | return 0; |
| 273 | } |
| 274 | } |
| 275 | return 1; |
| 276 | } |
| 277 | |
| 278 | #define SSH_X11_PROTO"MIT-MAGIC-COOKIE-1" "MIT-MAGIC-COOKIE-1" |
| 279 | #define X11_TIMEOUT_SLACK60 60 |
| 280 | int |
| 281 | client_x11_get_proto(struct ssh *ssh, const char *display, |
| 282 | const char *xauth_path, u_int trusted, u_int timeout, |
| 283 | char **_proto, char **_data) |
| 284 | { |
| 285 | char *cmd, line[512], xdisplay[512]; |
| 286 | char xauthfile[PATH_MAX1024], xauthdir[PATH_MAX1024]; |
| 287 | static char proto[512], data[512]; |
| 288 | FILE *f; |
| 289 | int got_data = 0, generated = 0, do_unlink = 0, r; |
| 290 | struct stat st; |
| 291 | u_int now, x11_timeout_real; |
| 292 | |
| 293 | *_proto = proto; |
| 294 | *_data = data; |
| 295 | proto[0] = data[0] = xauthfile[0] = xauthdir[0] = '\0'; |
| 296 | |
| 297 | if (!client_x11_display_valid(display)) { |
| 298 | if (display != NULL((void *)0)) |
| 299 | logit("DISPLAY \"%s\" invalid; disabling X11 forwarding",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 300 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "DISPLAY \"%s\" invalid; disabling X11 forwarding" , display) |
| 300 | display)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 300 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "DISPLAY \"%s\" invalid; disabling X11 forwarding" , display); |
| 301 | return -1; |
| 302 | } |
| 303 | if (xauth_path != NULL((void *)0) && stat(xauth_path, &st) == -1) { |
| 304 | debug("No xauth program.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 304 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "No xauth program."); |
| 305 | xauth_path = NULL((void *)0); |
| 306 | } |
| 307 | |
| 308 | if (xauth_path != NULL((void *)0)) { |
| 309 | /* |
| 310 | * Handle FamilyLocal case where $DISPLAY does |
| 311 | * not match an authorization entry. For this we |
| 312 | * just try "xauth list unix:displaynum.screennum". |
| 313 | * XXX: "localhost" match to determine FamilyLocal |
| 314 | * is not perfect. |
| 315 | */ |
| 316 | if (strncmp(display, "localhost:", 10) == 0) { |
| 317 | if ((r = snprintf(xdisplay, sizeof(xdisplay), "unix:%s", |
| 318 | display + 10)) < 0 || |
| 319 | (size_t)r >= sizeof(xdisplay)) { |
| 320 | error_f("display name too long")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 320 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "display name too long" ); |
| 321 | return -1; |
| 322 | } |
| 323 | display = xdisplay; |
| 324 | } |
| 325 | if (trusted == 0) { |
| 326 | /* |
| 327 | * Generate an untrusted X11 auth cookie. |
| 328 | * |
| 329 | * The authentication cookie should briefly outlive |
| 330 | * ssh's willingness to forward X11 connections to |
| 331 | * avoid nasty fail-open behaviour in the X server. |
| 332 | */ |
| 333 | mktemp_proto(xauthdir, sizeof(xauthdir)); |
| 334 | if (mkdtemp(xauthdir) == NULL((void *)0)) { |
| 335 | error_f("mkdtemp: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 335 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "mkdtemp: %s", strerror ((*__errno()))); |
| 336 | return -1; |
| 337 | } |
| 338 | do_unlink = 1; |
| 339 | if ((r = snprintf(xauthfile, sizeof(xauthfile), |
| 340 | "%s/xauthfile", xauthdir)) < 0 || |
| 341 | (size_t)r >= sizeof(xauthfile)) { |
| 342 | error_f("xauthfile path too long")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 342 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "xauthfile path too long" ); |
| 343 | rmdir(xauthdir); |
| 344 | return -1; |
| 345 | } |
| 346 | |
| 347 | if (timeout == 0) { |
| 348 | /* auth doesn't time out */ |
| 349 | xasprintf(&cmd, "%s -f %s generate %s %s " |
| 350 | "untrusted 2>%s", |
| 351 | xauth_path, xauthfile, display, |
| 352 | SSH_X11_PROTO"MIT-MAGIC-COOKIE-1", _PATH_DEVNULL"/dev/null"); |
| 353 | } else { |
| 354 | /* Add some slack to requested expiry */ |
| 355 | if (timeout < UINT_MAX0xffffffffU - X11_TIMEOUT_SLACK60) |
| 356 | x11_timeout_real = timeout + |
| 357 | X11_TIMEOUT_SLACK60; |
| 358 | else { |
| 359 | /* Don't overflow on long timeouts */ |
| 360 | x11_timeout_real = UINT_MAX0xffffffffU; |
| 361 | } |
| 362 | xasprintf(&cmd, "%s -f %s generate %s %s " |
| 363 | "untrusted timeout %u 2>%s", |
| 364 | xauth_path, xauthfile, display, |
| 365 | SSH_X11_PROTO"MIT-MAGIC-COOKIE-1", x11_timeout_real, |
| 366 | _PATH_DEVNULL"/dev/null"); |
| 367 | } |
| 368 | debug2_f("xauth command: %s", cmd)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 368 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "xauth command: %s", cmd ); |
| 369 | |
| 370 | if (timeout != 0 && x11_refuse_time == 0) { |
| 371 | now = monotime() + 1; |
| 372 | if (SSH_TIME_T_MAX0x7fffffffffffffffLL - timeout < now) |
| 373 | x11_refuse_time = SSH_TIME_T_MAX0x7fffffffffffffffLL; |
| 374 | else |
| 375 | x11_refuse_time = now + timeout; |
| 376 | channel_set_x11_refuse_time(ssh, |
| 377 | x11_refuse_time); |
| 378 | } |
| 379 | if (system(cmd) == 0) |
| 380 | generated = 1; |
| 381 | free(cmd); |
| 382 | } |
| 383 | |
| 384 | /* |
| 385 | * When in untrusted mode, we read the cookie only if it was |
| 386 | * successfully generated as an untrusted one in the step |
| 387 | * above. |
| 388 | */ |
| 389 | if (trusted || generated) { |
| 390 | xasprintf(&cmd, |
| 391 | "%s %s%s list %s 2>" _PATH_DEVNULL"/dev/null", |
| 392 | xauth_path, |
| 393 | generated ? "-f " : "" , |
| 394 | generated ? xauthfile : "", |
| 395 | display); |
| 396 | debug2("x11_get_proto: %s", cmd)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 396 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "x11_get_proto: %s", cmd ); |
| 397 | f = popen(cmd, "r"); |
| 398 | if (f && fgets(line, sizeof(line), f) && |
| 399 | sscanf(line, "%*s %511s %511s", proto, data) == 2) |
| 400 | got_data = 1; |
| 401 | if (f) |
| 402 | pclose(f); |
| 403 | free(cmd); |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | if (do_unlink) { |
| 408 | unlink(xauthfile); |
| 409 | rmdir(xauthdir); |
| 410 | } |
| 411 | |
| 412 | /* Don't fall back to fake X11 data for untrusted forwarding */ |
| 413 | if (!trusted && !got_data) { |
| 414 | error("Warning: untrusted X11 forwarding setup failed: "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 415 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Warning: untrusted X11 forwarding setup failed: " "xauth key data not generated") |
| 415 | "xauth key data not generated")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 415 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Warning: untrusted X11 forwarding setup failed: " "xauth key data not generated"); |
| 416 | return -1; |
| 417 | } |
| 418 | |
| 419 | /* |
| 420 | * If we didn't get authentication data, just make up some |
| 421 | * data. The forwarding code will check the validity of the |
| 422 | * response anyway, and substitute this data. The X11 |
| 423 | * server, however, will ignore this fake data and use |
| 424 | * whatever authentication mechanisms it was using otherwise |
| 425 | * for the local connection. |
| 426 | */ |
| 427 | if (!got_data) { |
| 428 | u_int8_t rnd[16]; |
| 429 | u_int i; |
| 430 | |
| 431 | logit("Warning: No xauth data; "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 432 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Warning: No xauth data; " "using fake authentication data for X11 forwarding.") |
| 432 | "using fake authentication data for X11 forwarding.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 432 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Warning: No xauth data; " "using fake authentication data for X11 forwarding."); |
| 433 | strlcpy(proto, SSH_X11_PROTO"MIT-MAGIC-COOKIE-1", sizeof proto); |
| 434 | arc4random_buf(rnd, sizeof(rnd)); |
| 435 | for (i = 0; i < sizeof(rnd); i++) { |
| 436 | snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", |
| 437 | rnd[i]); |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | return 0; |
| 442 | } |
| 443 | |
| 444 | /* |
| 445 | * Checks if the client window has changed, and sends a packet about it to |
| 446 | * the server if so. The actual change is detected elsewhere (by a software |
| 447 | * interrupt on Unix); this just checks the flag and sends a message if |
| 448 | * appropriate. |
| 449 | */ |
| 450 | |
| 451 | static void |
| 452 | client_check_window_change(struct ssh *ssh) |
| 453 | { |
| 454 | if (!received_window_change_signal) |
| 455 | return; |
| 456 | received_window_change_signal = 0; |
| 457 | debug2_f("changed")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 457 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "changed"); |
| 458 | channel_send_window_changes(ssh); |
| 459 | } |
| 460 | |
| 461 | static int |
| 462 | client_global_request_reply(int type, u_int32_t seq, struct ssh *ssh) |
| 463 | { |
| 464 | struct global_confirm *gc; |
| 465 | |
| 466 | if ((gc = TAILQ_FIRST(&global_confirms)((&global_confirms)->tqh_first)) == NULL((void *)0)) |
| 467 | return 0; |
| 468 | if (gc->cb != NULL((void *)0)) |
| 469 | gc->cb(ssh, type, seq, gc->ctx); |
| 470 | if (--gc->ref_count <= 0) { |
| 471 | TAILQ_REMOVE(&global_confirms, gc, entry)do { if (((gc)->entry.tqe_next) != ((void *)0)) (gc)->entry .tqe_next->entry.tqe_prev = (gc)->entry.tqe_prev; else ( &global_confirms)->tqh_last = (gc)->entry.tqe_prev; *(gc)->entry.tqe_prev = (gc)->entry.tqe_next; ; ; } while (0); |
| 472 | freezero(gc, sizeof(*gc)); |
| 473 | } |
| 474 | |
| 475 | ssh_packet_set_alive_timeouts(ssh, 0); |
| 476 | return 0; |
| 477 | } |
| 478 | |
| 479 | static void |
| 480 | schedule_server_alive_check(void) |
| 481 | { |
| 482 | if (options.server_alive_interval > 0) |
| 483 | server_alive_time = monotime() + options.server_alive_interval; |
| 484 | } |
| 485 | |
| 486 | static void |
| 487 | server_alive_check(struct ssh *ssh) |
| 488 | { |
| 489 | int r; |
| 490 | |
| 491 | if (ssh_packet_inc_alive_timeouts(ssh) > options.server_alive_count_max) { |
| 492 | logit("Timeout, server %s not responding.", host)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 492 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Timeout, server %s not responding." , host); |
| 493 | cleanup_exit(255); |
| 494 | } |
| 495 | if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST80)) != 0 || |
| 496 | (r = sshpkt_put_cstring(ssh, "keepalive@openssh.com")) != 0 || |
| 497 | (r = sshpkt_put_u8(ssh, 1)) != 0 || /* boolean: want reply */ |
| 498 | (r = sshpkt_send(ssh)) != 0) |
| 499 | fatal_fr(r, "send packet")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 499, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send packet"); |
| 500 | /* Insert an empty placeholder to maintain ordering */ |
| 501 | client_register_global_confirm(NULL((void *)0), NULL((void *)0)); |
| 502 | schedule_server_alive_check(); |
| 503 | } |
| 504 | |
| 505 | /* Try to send a dummy keystroke */ |
| 506 | static int |
| 507 | send_chaff(struct ssh *ssh) |
| 508 | { |
| 509 | int r; |
| 510 | |
| 511 | if ((ssh->kex->flags & KEX_HAS_PING0x0020) == 0) |
| 512 | return 0; |
| 513 | /* XXX probabilistically send chaff? */ |
| 514 | /* |
| 515 | * a SSH2_MSG_CHANNEL_DATA payload is 9 bytes: |
| 516 | * 4 bytes channel ID + 4 bytes string length + 1 byte string data |
| 517 | * simulate that here. |
| 518 | */ |
| 519 | if ((r = sshpkt_start(ssh, SSH2_MSG_PING192)) != 0 || |
| 520 | (r = sshpkt_put_cstring(ssh, "PING!")) != 0 || |
| 521 | (r = sshpkt_send(ssh)) != 0) |
| 522 | fatal_fr(r, "send packet")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 522, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send packet"); |
| 523 | return 1; |
| 524 | } |
| 525 | |
| 526 | /* Sets the next interval to send a keystroke or chaff packet */ |
| 527 | static void |
| 528 | set_next_interval(const struct timespec *now, struct timespec *next_interval, |
| 529 | u_int interval_ms, int starting) |
| 530 | { |
| 531 | struct timespec tmp; |
| 532 | long long interval_ns, fuzz_ns; |
| 533 | static long long rate_fuzz; |
| 534 | |
| 535 | interval_ns = interval_ms * (1000LL * 1000); |
| 536 | fuzz_ns = (interval_ns * SSH_KEYSTROKE_TIMING_FUZZ10) / 100; |
| 537 | /* Center fuzz around requested interval */ |
| 538 | if (fuzz_ns > INT_MAX0x7fffffff) |
| 539 | fuzz_ns = INT_MAX0x7fffffff; |
| 540 | if (fuzz_ns > interval_ns) { |
| 541 | /* Shouldn't happen */ |
| 542 | fatal_f("internal error: fuzz %u%% %lldns > interval %lldns",sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 543, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "internal error: fuzz %u%% %lldns > interval %lldns" , 10, fuzz_ns, interval_ns) |
| 543 | SSH_KEYSTROKE_TIMING_FUZZ, fuzz_ns, interval_ns)sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 543, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "internal error: fuzz %u%% %lldns > interval %lldns" , 10, fuzz_ns, interval_ns); |
| 544 | } |
| 545 | /* |
| 546 | * Randomise the keystroke/chaff intervals in two ways: |
| 547 | * 1. Each interval has some random jitter applied to make the |
| 548 | * interval-to-interval time unpredictable. |
| 549 | * 2. The overall interval rate is also randomly perturbed for each |
| 550 | * chaffing session to make the average rate unpredictable. |
| 551 | */ |
| 552 | if (starting) |
| 553 | rate_fuzz = arc4random_uniform(fuzz_ns); |
| 554 | interval_ns -= fuzz_ns; |
| 555 | interval_ns += arc4random_uniform(fuzz_ns) + rate_fuzz; |
| 556 | |
| 557 | tmp.tv_sec = interval_ns / (1000 * 1000 * 1000); |
| 558 | tmp.tv_nsec = interval_ns % (1000 * 1000 * 1000); |
| 559 | |
| 560 | timespecadd(now, &tmp, next_interval)do { (next_interval)->tv_sec = (now)->tv_sec + (&tmp )->tv_sec; (next_interval)->tv_nsec = (now)->tv_nsec + (&tmp)->tv_nsec; if ((next_interval)->tv_nsec >= 1000000000L) { (next_interval)->tv_sec++; (next_interval) ->tv_nsec -= 1000000000L; } } while (0); |
| 561 | } |
| 562 | |
| 563 | /* |
| 564 | * Performs keystroke timing obfuscation. Returns non-zero if the |
| 565 | * output fd should be polled. |
| 566 | */ |
| 567 | static int |
| 568 | obfuscate_keystroke_timing(struct ssh *ssh, struct timespec *timeout, |
| 569 | int channel_did_enqueue) |
| 570 | { |
| 571 | static int active; |
| 572 | static struct timespec next_interval, chaff_until; |
| 573 | struct timespec now, tmp; |
| 574 | int just_started = 0, had_keystroke = 0; |
| 575 | static unsigned long long nchaff; |
| 576 | char *stop_reason = NULL((void *)0); |
| 577 | long long n; |
| 578 | |
| 579 | monotime_ts(&now); |
| 580 | |
| 581 | if (options.obscure_keystroke_timing_interval <= 0) |
| 582 | return 1; /* disabled in config */ |
| 583 | |
| 584 | if (!channel_tty_open(ssh) || quit_pending) { |
| 585 | /* Stop if no channels left of we're waiting for one to close */ |
| 586 | stop_reason = "no active channels"; |
| 587 | } else if (ssh_packet_is_rekeying(ssh)) { |
| 588 | /* Stop if we're rekeying */ |
| 589 | stop_reason = "rekeying started"; |
| 590 | } else if (!ssh_packet_interactive_data_to_write(ssh) && |
| 591 | ssh_packet_have_data_to_write(ssh)) { |
| 592 | /* Stop if the output buffer has more than a few keystrokes */ |
| 593 | stop_reason = "output buffer filling"; |
| 594 | } else if (active && channel_did_enqueue && |
| 595 | ssh_packet_have_data_to_write(ssh)) { |
| 596 | /* Still in active mode and have a keystroke queued. */ |
| 597 | had_keystroke = 1; |
| 598 | } else if (active) { |
| 599 | if (timespeccmp(&now, &chaff_until, >=)(((&now)->tv_sec == (&chaff_until)->tv_sec) ? ( (&now)->tv_nsec >= (&chaff_until)->tv_nsec) : ((&now)->tv_sec >= (&chaff_until)->tv_sec))) { |
| 600 | /* Stop if there have been no keystrokes for a while */ |
| 601 | stop_reason = "chaff time expired"; |
| 602 | } else if (timespeccmp(&now, &next_interval, >=)(((&now)->tv_sec == (&next_interval)->tv_sec) ? ((&now)->tv_nsec >= (&next_interval)->tv_nsec ) : ((&now)->tv_sec >= (&next_interval)->tv_sec ))) { |
| 603 | /* Otherwise if we were due to send, then send chaff */ |
| 604 | if (send_chaff(ssh)) |
| 605 | nchaff++; |
| 606 | } |
| 607 | } |
| 608 | |
| 609 | if (stop_reason != NULL((void *)0)) { |
| 610 | if (active) { |
| 611 | debug3_f("stopping: %s (%llu chaff packets sent)",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 612 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "stopping: %s (%llu chaff packets sent)" , stop_reason, nchaff) |
| 612 | stop_reason, nchaff)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 612 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "stopping: %s (%llu chaff packets sent)" , stop_reason, nchaff); |
| 613 | active = 0; |
| 614 | } |
| 615 | return 1; |
| 616 | } |
| 617 | |
| 618 | /* |
| 619 | * If we're in interactive mode, and only have a small amount |
| 620 | * of outbound data, then we assume that the user is typing |
| 621 | * interactively. In this case, start quantising outbound packets to |
| 622 | * fixed time intervals to hide inter-keystroke timing. |
| 623 | */ |
| 624 | if (!active && ssh_packet_interactive_data_to_write(ssh) && |
| 625 | channel_did_enqueue && ssh_packet_have_data_to_write(ssh)) { |
| 626 | debug3_f("starting: interval ~%dms",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 627 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "starting: interval ~%dms" , options.obscure_keystroke_timing_interval) |
| 627 | options.obscure_keystroke_timing_interval)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 627 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "starting: interval ~%dms" , options.obscure_keystroke_timing_interval); |
| 628 | just_started = had_keystroke = active = 1; |
| 629 | nchaff = 0; |
| 630 | set_next_interval(&now, &next_interval, |
| 631 | options.obscure_keystroke_timing_interval, 1); |
| 632 | } |
| 633 | |
| 634 | /* Don't hold off if obfuscation inactive */ |
| 635 | if (!active) |
| 636 | return 1; |
| 637 | |
| 638 | if (had_keystroke) { |
| 639 | /* |
| 640 | * Arrange to send chaff packets for a random interval after |
| 641 | * the last keystroke was sent. |
| 642 | */ |
| 643 | ms_to_timespec(&tmp, SSH_KEYSTROKE_CHAFF_MIN_MS1024 + |
| 644 | arc4random_uniform(SSH_KEYSTROKE_CHAFF_RNG_MS2048)); |
| 645 | timespecadd(&now, &tmp, &chaff_until)do { (&chaff_until)->tv_sec = (&now)->tv_sec + ( &tmp)->tv_sec; (&chaff_until)->tv_nsec = (& now)->tv_nsec + (&tmp)->tv_nsec; if ((&chaff_until )->tv_nsec >= 1000000000L) { (&chaff_until)->tv_sec ++; (&chaff_until)->tv_nsec -= 1000000000L; } } while ( 0); |
| 646 | } |
| 647 | |
| 648 | ptimeout_deadline_monotime_tsp(timeout, &next_interval); |
| 649 | |
| 650 | if (just_started) |
| 651 | return 1; |
| 652 | |
| 653 | /* Don't arm output fd for poll until the timing interval has elapsed */ |
| 654 | if (timespeccmp(&now, &next_interval, <)(((&now)->tv_sec == (&next_interval)->tv_sec) ? ((&now)->tv_nsec < (&next_interval)->tv_nsec ) : ((&now)->tv_sec < (&next_interval)->tv_sec ))) |
| 655 | return 0; |
| 656 | |
| 657 | /* Calculate number of intervals missed since the last check */ |
| 658 | n = (now.tv_sec - next_interval.tv_sec) * 1000LL * 1000 * 1000; |
| 659 | n += now.tv_nsec - next_interval.tv_nsec; |
| 660 | n /= options.obscure_keystroke_timing_interval * 1000LL * 1000; |
| 661 | n = (n < 0) ? 1 : n + 1; |
| 662 | |
| 663 | /* Advance to the next interval */ |
| 664 | set_next_interval(&now, &next_interval, |
| 665 | options.obscure_keystroke_timing_interval * n, 0); |
| 666 | return 1; |
| 667 | } |
| 668 | |
| 669 | /* |
| 670 | * Waits until the client can do something (some data becomes available on |
| 671 | * one of the file descriptors). |
| 672 | */ |
| 673 | static void |
| 674 | client_wait_until_can_do_something(struct ssh *ssh, struct pollfd **pfdp, |
| 675 | u_int *npfd_allocp, u_int *npfd_activep, int channel_did_enqueue, |
| 676 | sigset_t *sigsetp, int *conn_in_readyp, int *conn_out_readyp) |
| 677 | { |
| 678 | struct timespec timeout; |
| 679 | int ret, oready; |
| 680 | u_int p; |
| 681 | |
| 682 | *conn_in_readyp = *conn_out_readyp = 0; |
| 683 | |
| 684 | /* Prepare channel poll. First two pollfd entries are reserved */ |
| 685 | ptimeout_init(&timeout); |
| 686 | channel_prepare_poll(ssh, pfdp, npfd_allocp, npfd_activep, 2, &timeout); |
| 687 | if (*npfd_activep < 2) |
| 688 | fatal_f("bad npfd %u", *npfd_activep)sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 688, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "bad npfd %u", *npfd_activep ); /* shouldn't happen */ |
| 689 | |
| 690 | /* channel_prepare_poll could have closed the last channel */ |
| 691 | if (session_closed && !channel_still_open(ssh) && |
| 692 | !ssh_packet_have_data_to_write(ssh)) { |
| 693 | /* clear events since we did not call poll() */ |
| 694 | for (p = 0; p < *npfd_activep; p++) |
| 695 | (*pfdp)[p].revents = 0; |
| 696 | return; |
| 697 | } |
| 698 | |
| 699 | oready = obfuscate_keystroke_timing(ssh, &timeout, channel_did_enqueue); |
| 700 | |
| 701 | /* Monitor server connection on reserved pollfd entries */ |
| 702 | (*pfdp)[0].fd = connection_in; |
| 703 | (*pfdp)[0].events = POLLIN0x0001; |
| 704 | (*pfdp)[1].fd = connection_out; |
| 705 | (*pfdp)[1].events = (oready && ssh_packet_have_data_to_write(ssh)) ? |
| 706 | POLLOUT0x0004 : 0; |
| 707 | |
| 708 | /* |
| 709 | * Wait for something to happen. This will suspend the process until |
| 710 | * some polled descriptor can be read, written, or has some other |
| 711 | * event pending, or a timeout expires. |
| 712 | */ |
| 713 | set_control_persist_exit_time(ssh); |
| 714 | if (control_persist_exit_time > 0) |
| 715 | ptimeout_deadline_monotime(&timeout, control_persist_exit_time); |
| 716 | if (options.server_alive_interval > 0) |
| 717 | ptimeout_deadline_monotime(&timeout, server_alive_time); |
| 718 | if (options.rekey_interval > 0 && !ssh_packet_is_rekeying(ssh)) { |
| 719 | ptimeout_deadline_sec(&timeout, |
| 720 | ssh_packet_get_rekey_timeout(ssh)); |
| 721 | } |
| 722 | |
| 723 | ret = ppoll(*pfdp, *npfd_activep, ptimeout_get_tsp(&timeout), sigsetp); |
| 724 | |
| 725 | if (ret == -1) { |
| 726 | /* |
| 727 | * We have to clear the events because we return. |
| 728 | * We have to return, because the mainloop checks for the flags |
| 729 | * set by the signal handlers. |
| 730 | */ |
| 731 | for (p = 0; p < *npfd_activep; p++) |
| 732 | (*pfdp)[p].revents = 0; |
| 733 | if (errno(*__errno()) == EINTR4) |
| 734 | return; |
| 735 | /* Note: we might still have data in the buffers. */ |
| 736 | quit_message("poll: %s", strerror(errno(*__errno()))); |
| 737 | return; |
| 738 | } |
| 739 | |
| 740 | *conn_in_readyp = (*pfdp)[0].revents != 0; |
| 741 | *conn_out_readyp = (*pfdp)[1].revents != 0; |
| 742 | |
| 743 | if (options.server_alive_interval > 0 && !*conn_in_readyp && |
| 744 | monotime() >= server_alive_time) { |
| 745 | /* |
| 746 | * ServerAlive check is needed. We can't rely on the poll |
| 747 | * timing out since traffic on the client side such as port |
| 748 | * forwards can keep waking it up. |
| 749 | */ |
| 750 | server_alive_check(ssh); |
| 751 | } |
| 752 | } |
| 753 | |
| 754 | static void |
| 755 | client_suspend_self(struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr) |
| 756 | { |
| 757 | /* Flush stdout and stderr buffers. */ |
| 758 | if (sshbuf_len(bout) > 0) |
| 759 | atomicio(vwrite(ssize_t (*)(int, void *, size_t))write, fileno(stdout)(!__isthreaded ? (((&__sF[1]))->_file) : (fileno)((& __sF[1]))), sshbuf_mutable_ptr(bout), |
| 760 | sshbuf_len(bout)); |
| 761 | if (sshbuf_len(berr) > 0) |
| 762 | atomicio(vwrite(ssize_t (*)(int, void *, size_t))write, fileno(stderr)(!__isthreaded ? (((&__sF[2]))->_file) : (fileno)((& __sF[2]))), sshbuf_mutable_ptr(berr), |
| 763 | sshbuf_len(berr)); |
| 764 | |
| 765 | leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE3); |
| 766 | |
| 767 | sshbuf_reset(bin); |
| 768 | sshbuf_reset(bout); |
| 769 | sshbuf_reset(berr); |
| 770 | |
| 771 | /* Send the suspend signal to the program itself. */ |
| 772 | kill(getpid(), SIGTSTP18); |
| 773 | |
| 774 | /* Reset window sizes in case they have changed */ |
| 775 | received_window_change_signal = 1; |
| 776 | |
| 777 | enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE3); |
| 778 | } |
| 779 | |
| 780 | static void |
| 781 | client_process_net_input(struct ssh *ssh) |
| 782 | { |
| 783 | int r; |
| 784 | |
| 785 | /* |
| 786 | * Read input from the server, and add any such data to the buffer of |
| 787 | * the packet subsystem. |
| 788 | */ |
| 789 | schedule_server_alive_check(); |
| 790 | if ((r = ssh_packet_process_read(ssh, connection_in)) == 0) |
| 791 | return; /* success */ |
| 792 | if (r == SSH_ERR_SYSTEM_ERROR-24) { |
| 793 | if (errno(*__errno()) == EAGAIN35 || errno(*__errno()) == EINTR4) |
| 794 | return; |
| 795 | if (errno(*__errno()) == EPIPE32) { |
| 796 | quit_message("Connection to %s closed by remote host.", |
| 797 | host); |
| 798 | return; |
| 799 | } |
| 800 | } |
| 801 | quit_message("Read from remote host %s: %s", host, ssh_err(r)); |
| 802 | } |
| 803 | |
| 804 | static void |
| 805 | client_status_confirm(struct ssh *ssh, int type, Channel *c, void *ctx) |
| 806 | { |
| 807 | struct channel_reply_ctx *cr = (struct channel_reply_ctx *)ctx; |
| 808 | char errmsg[256]; |
| 809 | int r, tochan; |
| 810 | |
| 811 | /* |
| 812 | * If a TTY was explicitly requested, then a failure to allocate |
| 813 | * one is fatal. |
| 814 | */ |
| 815 | if (cr->action == CONFIRM_TTY && |
| 816 | (options.request_tty == REQUEST_TTY_FORCE3 || |
| 817 | options.request_tty == REQUEST_TTY_YES2)) |
| 818 | cr->action = CONFIRM_CLOSE; |
| 819 | |
| 820 | /* XXX suppress on mux _client_ quietmode */ |
| 821 | tochan = options.log_level >= SYSLOG_LEVEL_ERROR && |
| 822 | c->ctl_chan != -1 && c->extended_usage == CHAN_EXTENDED_WRITE2; |
| 823 | |
| 824 | if (type == SSH2_MSG_CHANNEL_SUCCESS99) { |
| 825 | debug2("%s request accepted on channel %d",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 826 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "%s request accepted on channel %d" , cr->request_type, c->self) |
| 826 | cr->request_type, c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 826 , 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "%s request accepted on channel %d" , cr->request_type, c->self); |
| 827 | } else if (type == SSH2_MSG_CHANNEL_FAILURE100) { |
| 828 | if (tochan) { |
| 829 | snprintf(errmsg, sizeof(errmsg), |
| 830 | "%s request failed\r\n", cr->request_type); |
| 831 | } else { |
| 832 | snprintf(errmsg, sizeof(errmsg), |
| 833 | "%s request failed on channel %d", |
| 834 | cr->request_type, c->self); |
| 835 | } |
| 836 | /* If error occurred on primary session channel, then exit */ |
| 837 | if (cr->action == CONFIRM_CLOSE && c->self == session_ident) |
| 838 | fatal("%s", errmsg)sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 838, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "%s", errmsg); |
| 839 | /* |
| 840 | * If error occurred on mux client, append to |
| 841 | * their stderr. |
| 842 | */ |
| 843 | if (tochan) { |
| 844 | debug3_f("channel %d: mux request: %s", c->self,sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 845 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "channel %d: mux request: %s" , c->self, cr->request_type) |
| 845 | cr->request_type)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 845 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "channel %d: mux request: %s" , c->self, cr->request_type); |
| 846 | if ((r = sshbuf_put(c->extended, errmsg, |
| 847 | strlen(errmsg))) != 0) |
| 848 | fatal_fr(r, "sshbuf_put")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 848, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_put"); |
| 849 | } else |
| 850 | error("%s", errmsg)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 850 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "%s", errmsg); |
| 851 | if (cr->action == CONFIRM_TTY) { |
| 852 | /* |
| 853 | * If a TTY allocation error occurred, then arrange |
| 854 | * for the correct TTY to leave raw mode. |
| 855 | */ |
| 856 | if (c->self == session_ident) |
| 857 | leave_raw_mode(0); |
| 858 | else |
| 859 | mux_tty_alloc_failed(ssh, c); |
| 860 | } else if (cr->action == CONFIRM_CLOSE) { |
| 861 | chan_read_failed(ssh, c); |
| 862 | chan_write_failed(ssh, c); |
| 863 | } |
| 864 | } |
| 865 | free(cr); |
| 866 | } |
| 867 | |
| 868 | static void |
| 869 | client_abandon_status_confirm(struct ssh *ssh, Channel *c, void *ctx) |
| 870 | { |
| 871 | free(ctx); |
| 872 | } |
| 873 | |
| 874 | void |
| 875 | client_expect_confirm(struct ssh *ssh, int id, const char *request, |
| 876 | enum confirm_action action) |
| 877 | { |
| 878 | struct channel_reply_ctx *cr = xcalloc(1, sizeof(*cr)); |
| 879 | |
| 880 | cr->request_type = request; |
| 881 | cr->action = action; |
| 882 | |
| 883 | channel_register_status_confirm(ssh, id, client_status_confirm, |
| 884 | client_abandon_status_confirm, cr); |
| 885 | } |
| 886 | |
| 887 | void |
| 888 | client_register_global_confirm(global_confirm_cb *cb, void *ctx) |
| 889 | { |
| 890 | struct global_confirm *gc, *last_gc; |
| 891 | |
| 892 | /* Coalesce identical callbacks */ |
| 893 | last_gc = TAILQ_LAST(&global_confirms, global_confirms)(*(((struct global_confirms *)((&global_confirms)->tqh_last ))->tqh_last)); |
| 894 | if (last_gc && last_gc->cb == cb && last_gc->ctx == ctx) { |
| 895 | if (++last_gc->ref_count >= INT_MAX0x7fffffff) |
| 896 | fatal_f("last_gc->ref_count = %d",sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 897, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "last_gc->ref_count = %d" , last_gc->ref_count) |
| 897 | last_gc->ref_count)sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 897, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "last_gc->ref_count = %d" , last_gc->ref_count); |
| 898 | return; |
| 899 | } |
| 900 | |
| 901 | gc = xcalloc(1, sizeof(*gc)); |
| 902 | gc->cb = cb; |
| 903 | gc->ctx = ctx; |
| 904 | gc->ref_count = 1; |
| 905 | TAILQ_INSERT_TAIL(&global_confirms, gc, entry)do { (gc)->entry.tqe_next = ((void *)0); (gc)->entry.tqe_prev = (&global_confirms)->tqh_last; *(&global_confirms )->tqh_last = (gc); (&global_confirms)->tqh_last = & (gc)->entry.tqe_next; } while (0); |
| 906 | } |
| 907 | |
| 908 | /* |
| 909 | * Returns non-zero if the client is able to handle a hostkeys-00@openssh.com |
| 910 | * hostkey update request. |
| 911 | */ |
| 912 | static int |
| 913 | can_update_hostkeys(void) |
| 914 | { |
| 915 | if (hostkeys_update_complete) |
| 916 | return 0; |
| 917 | if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK2 && |
| 918 | options.batch_mode) |
| 919 | return 0; /* won't ask in batchmode, so don't even try */ |
| 920 | if (!options.update_hostkeys || options.num_user_hostfiles <= 0) |
| 921 | return 0; |
| 922 | return 1; |
| 923 | } |
| 924 | |
| 925 | static void |
| 926 | client_repledge(void) |
| 927 | { |
| 928 | debug3_f("enter")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 928 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "enter"); |
| 929 | |
| 930 | /* Might be able to tighten pledge now that session is established */ |
| 931 | if (options.control_master || options.control_path != NULL((void *)0) || |
| 932 | options.forward_x11 || options.fork_after_authentication || |
| 933 | can_update_hostkeys() || |
| 934 | (session_ident != -1 && !session_setup_complete)) { |
| 935 | /* Can't tighten */ |
| 936 | return; |
| 937 | } |
| 938 | /* |
| 939 | * LocalCommand and UpdateHostkeys have finished, so can get rid of |
| 940 | * filesystem. |
| 941 | * |
| 942 | * XXX protocol allows a server can to change hostkeys during the |
| 943 | * connection at rekey time that could trigger a hostkeys update |
| 944 | * but AFAIK no implementations support this. Could improve by |
| 945 | * forcing known_hosts to be read-only or via unveil(2). |
| 946 | */ |
| 947 | if (options.num_local_forwards != 0 || |
| 948 | options.num_remote_forwards != 0 || |
| 949 | options.num_permitted_remote_opens != 0 || |
| 950 | options.enable_escape_commandline != 0) { |
| 951 | /* rfwd needs inet */ |
| 952 | debug("pledge: network")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 952 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "pledge: network"); |
| 953 | if (pledge("stdio unix inet dns proc tty", NULL((void *)0)) == -1) |
| 954 | fatal_f("pledge(): %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 954, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "pledge(): %s", strerror ((*__errno()))); |
| 955 | } else if (options.forward_agent != 0) { |
| 956 | /* agent forwarding needs to open $SSH_AUTH_SOCK at will */ |
| 957 | debug("pledge: agent")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 957 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "pledge: agent"); |
| 958 | if (pledge("stdio unix proc tty", NULL((void *)0)) == -1) |
| 959 | fatal_f("pledge(): %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 959, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "pledge(): %s", strerror ((*__errno()))); |
| 960 | } else { |
| 961 | debug("pledge: fork")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 961 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "pledge: fork"); |
| 962 | if (pledge("stdio proc tty", NULL((void *)0)) == -1) |
| 963 | fatal_f("pledge(): %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 963, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "pledge(): %s", strerror ((*__errno()))); |
| 964 | } |
| 965 | /* XXX further things to do: |
| 966 | * |
| 967 | * - might be able to get rid of proc if we kill ~^Z |
| 968 | * - ssh -N (no session) |
| 969 | * - stdio forwarding |
| 970 | * - sessions without tty |
| 971 | */ |
| 972 | } |
| 973 | |
| 974 | static void |
| 975 | process_cmdline(struct ssh *ssh) |
| 976 | { |
| 977 | void (*handler)(int); |
| 978 | char *s, *cmd; |
| 979 | int ok, delete = 0, local = 0, remote = 0, dynamic = 0; |
| 980 | struct Forward fwd; |
| 981 | |
| 982 | memset(&fwd, 0, sizeof(fwd)); |
| 983 | |
| 984 | leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE3); |
| 985 | handler = ssh_signal(SIGINT2, SIG_IGN(void (*)(int))1); |
| 986 | cmd = s = read_passphrase("\r\nssh> ", RP_ECHO0x0001); |
| 987 | if (s == NULL((void *)0)) |
| 988 | goto out; |
| 989 | while (isspace((u_char)*s)) |
| 990 | s++; |
| 991 | if (*s == '-') |
| 992 | s++; /* Skip cmdline '-', if any */ |
| 993 | if (*s == '\0') |
| 994 | goto out; |
| 995 | |
| 996 | if (*s == 'h' || *s == 'H' || *s == '?') { |
| 997 | logit("Commands:")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 997 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Commands:"); |
| 998 | logit(" -L[bind_address:]port:host:hostport "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 999 , 0, SYSLOG_LEVEL_INFO, ((void *)0), " -L[bind_address:]port:host:hostport " "Request local forward") |
| 999 | "Request local forward")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 999 , 0, SYSLOG_LEVEL_INFO, ((void *)0), " -L[bind_address:]port:host:hostport " "Request local forward"); |
| 1000 | logit(" -R[bind_address:]port:host:hostport "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1001 , 0, SYSLOG_LEVEL_INFO, ((void *)0), " -R[bind_address:]port:host:hostport " "Request remote forward") |
| 1001 | "Request remote forward")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1001 , 0, SYSLOG_LEVEL_INFO, ((void *)0), " -R[bind_address:]port:host:hostport " "Request remote forward"); |
| 1002 | logit(" -D[bind_address:]port "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1003 , 0, SYSLOG_LEVEL_INFO, ((void *)0), " -D[bind_address:]port " "Request dynamic forward") |
| 1003 | "Request dynamic forward")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1003 , 0, SYSLOG_LEVEL_INFO, ((void *)0), " -D[bind_address:]port " "Request dynamic forward"); |
| 1004 | logit(" -KL[bind_address:]port "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1005 , 0, SYSLOG_LEVEL_INFO, ((void *)0), " -KL[bind_address:]port " "Cancel local forward") |
| 1005 | "Cancel local forward")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1005 , 0, SYSLOG_LEVEL_INFO, ((void *)0), " -KL[bind_address:]port " "Cancel local forward"); |
| 1006 | logit(" -KR[bind_address:]port "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1007 , 0, SYSLOG_LEVEL_INFO, ((void *)0), " -KR[bind_address:]port " "Cancel remote forward") |
| 1007 | "Cancel remote forward")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1007 , 0, SYSLOG_LEVEL_INFO, ((void *)0), " -KR[bind_address:]port " "Cancel remote forward"); |
| 1008 | logit(" -KD[bind_address:]port "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1009 , 0, SYSLOG_LEVEL_INFO, ((void *)0), " -KD[bind_address:]port " "Cancel dynamic forward") |
| 1009 | "Cancel dynamic forward")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1009 , 0, SYSLOG_LEVEL_INFO, ((void *)0), " -KD[bind_address:]port " "Cancel dynamic forward"); |
| 1010 | if (!options.permit_local_command) |
| 1011 | goto out; |
| 1012 | logit(" !args "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1013 , 0, SYSLOG_LEVEL_INFO, ((void *)0), " !args " "Execute local command") |
| 1013 | "Execute local command")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1013 , 0, SYSLOG_LEVEL_INFO, ((void *)0), " !args " "Execute local command"); |
| 1014 | goto out; |
| 1015 | } |
| 1016 | |
| 1017 | if (*s == '!' && options.permit_local_command) { |
| 1018 | s++; |
| 1019 | ssh_local_cmd(s); |
| 1020 | goto out; |
| 1021 | } |
| 1022 | |
| 1023 | if (*s == 'K') { |
| 1024 | delete = 1; |
| 1025 | s++; |
| 1026 | } |
| 1027 | if (*s == 'L') |
| 1028 | local = 1; |
| 1029 | else if (*s == 'R') |
| 1030 | remote = 1; |
| 1031 | else if (*s == 'D') |
| 1032 | dynamic = 1; |
| 1033 | else { |
| 1034 | logit("Invalid command.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1034 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Invalid command."); |
| 1035 | goto out; |
| 1036 | } |
| 1037 | |
| 1038 | while (isspace((u_char)*++s)) |
| 1039 | ; |
| 1040 | |
| 1041 | /* XXX update list of forwards in options */ |
| 1042 | if (delete) { |
| 1043 | /* We pass 1 for dynamicfwd to restrict to 1 or 2 fields. */ |
| 1044 | if (!parse_forward(&fwd, s, 1, 0)) { |
| 1045 | logit("Bad forwarding close specification.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1045 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Bad forwarding close specification." ); |
| 1046 | goto out; |
| 1047 | } |
| 1048 | if (remote) |
| 1049 | ok = channel_request_rforward_cancel(ssh, &fwd) == 0; |
| 1050 | else if (dynamic) |
| 1051 | ok = channel_cancel_lport_listener(ssh, &fwd, |
| 1052 | 0, &options.fwd_opts) > 0; |
| 1053 | else |
| 1054 | ok = channel_cancel_lport_listener(ssh, &fwd, |
| 1055 | CHANNEL_CANCEL_PORT_STATIC-1, |
| 1056 | &options.fwd_opts) > 0; |
| 1057 | if (!ok) { |
| 1058 | logit("Unknown port forwarding.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1058 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Unknown port forwarding." ); |
| 1059 | goto out; |
| 1060 | } |
| 1061 | logit("Canceled forwarding.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1061 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Canceled forwarding."); |
| 1062 | } else { |
| 1063 | /* -R specs can be both dynamic or not, so check both. */ |
| 1064 | if (remote) { |
| 1065 | if (!parse_forward(&fwd, s, 0, remote) && |
| 1066 | !parse_forward(&fwd, s, 1, remote)) { |
| 1067 | logit("Bad remote forwarding specification.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1067 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Bad remote forwarding specification." ); |
| 1068 | goto out; |
| 1069 | } |
| 1070 | } else if (!parse_forward(&fwd, s, dynamic, remote)) { |
| 1071 | logit("Bad local forwarding specification.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1071 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Bad local forwarding specification." ); |
| 1072 | goto out; |
| 1073 | } |
| 1074 | if (local || dynamic) { |
| 1075 | if (!channel_setup_local_fwd_listener(ssh, &fwd, |
| 1076 | &options.fwd_opts)) { |
| 1077 | logit("Port forwarding failed.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1077 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Port forwarding failed." ); |
| 1078 | goto out; |
| 1079 | } |
| 1080 | } else { |
| 1081 | if (channel_request_remote_forwarding(ssh, &fwd) < 0) { |
| 1082 | logit("Port forwarding failed.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1082 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Port forwarding failed." ); |
| 1083 | goto out; |
| 1084 | } |
| 1085 | } |
| 1086 | logit("Forwarding port.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1086 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Forwarding port."); |
| 1087 | } |
| 1088 | |
| 1089 | out: |
| 1090 | ssh_signal(SIGINT2, handler); |
| 1091 | enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE3); |
| 1092 | free(cmd); |
| 1093 | free(fwd.listen_host); |
| 1094 | free(fwd.listen_path); |
| 1095 | free(fwd.connect_host); |
| 1096 | free(fwd.connect_path); |
| 1097 | } |
| 1098 | |
| 1099 | /* reasons to suppress output of an escape command in help output */ |
| 1100 | #define SUPPRESS_NEVER0 0 /* never suppress, always show */ |
| 1101 | #define SUPPRESS_MUXCLIENT1 1 /* don't show in mux client sessions */ |
| 1102 | #define SUPPRESS_MUXMASTER2 2 /* don't show in mux master sessions */ |
| 1103 | #define SUPPRESS_SYSLOG4 4 /* don't show when logging to syslog */ |
| 1104 | #define SUPPRESS_NOCMDLINE8 8 /* don't show when cmdline disabled*/ |
| 1105 | struct escape_help_text { |
| 1106 | const char *cmd; |
| 1107 | const char *text; |
| 1108 | unsigned int flags; |
| 1109 | }; |
| 1110 | static struct escape_help_text esc_txt[] = { |
| 1111 | {".", "terminate session", SUPPRESS_MUXMASTER2}, |
| 1112 | {".", "terminate connection (and any multiplexed sessions)", |
| 1113 | SUPPRESS_MUXCLIENT1}, |
| 1114 | {"B", "send a BREAK to the remote system", SUPPRESS_NEVER0}, |
| 1115 | {"C", "open a command line", SUPPRESS_MUXCLIENT1|SUPPRESS_NOCMDLINE8}, |
| 1116 | {"R", "request rekey", SUPPRESS_NEVER0}, |
| 1117 | {"V/v", "decrease/increase verbosity (LogLevel)", SUPPRESS_MUXCLIENT1}, |
| 1118 | {"^Z", "suspend ssh", SUPPRESS_MUXCLIENT1}, |
| 1119 | {"#", "list forwarded connections", SUPPRESS_NEVER0}, |
| 1120 | {"&", "background ssh (when waiting for connections to terminate)", |
| 1121 | SUPPRESS_MUXCLIENT1}, |
| 1122 | {"?", "this message", SUPPRESS_NEVER0}, |
| 1123 | }; |
| 1124 | |
| 1125 | static void |
| 1126 | print_escape_help(struct sshbuf *b, int escape_char, int mux_client, |
| 1127 | int using_stderr) |
| 1128 | { |
| 1129 | unsigned int i, suppress_flags; |
| 1130 | int r; |
| 1131 | |
| 1132 | if ((r = sshbuf_putf(b, |
| 1133 | "%c?\r\nSupported escape sequences:\r\n", escape_char)) != 0) |
| 1134 | fatal_fr(r, "sshbuf_putf")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1134, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_putf"); |
| 1135 | |
| 1136 | suppress_flags = |
| 1137 | (mux_client ? SUPPRESS_MUXCLIENT1 : 0) | |
| 1138 | (mux_client ? 0 : SUPPRESS_MUXMASTER2) | |
| 1139 | (using_stderr ? 0 : SUPPRESS_SYSLOG4) | |
| 1140 | (options.enable_escape_commandline == 0 ? SUPPRESS_NOCMDLINE8 : 0); |
| 1141 | |
| 1142 | for (i = 0; i < sizeof(esc_txt)/sizeof(esc_txt[0]); i++) { |
| 1143 | if (esc_txt[i].flags & suppress_flags) |
| 1144 | continue; |
| 1145 | if ((r = sshbuf_putf(b, " %c%-3s - %s\r\n", |
| 1146 | escape_char, esc_txt[i].cmd, esc_txt[i].text)) != 0) |
| 1147 | fatal_fr(r, "sshbuf_putf")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1147, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_putf"); |
| 1148 | } |
| 1149 | |
| 1150 | if ((r = sshbuf_putf(b, |
| 1151 | " %c%c - send the escape character by typing it twice\r\n" |
| 1152 | "(Note that escapes are only recognized immediately after " |
| 1153 | "newline.)\r\n", escape_char, escape_char)) != 0) |
| 1154 | fatal_fr(r, "sshbuf_putf")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1154, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_putf"); |
| 1155 | } |
| 1156 | |
| 1157 | /* |
| 1158 | * Process the characters one by one. |
| 1159 | */ |
| 1160 | static int |
| 1161 | process_escapes(struct ssh *ssh, Channel *c, |
| 1162 | struct sshbuf *bin, struct sshbuf *bout, struct sshbuf *berr, |
| 1163 | char *buf, int len) |
| 1164 | { |
| 1165 | pid_t pid; |
| 1166 | int r, bytes = 0; |
| 1167 | u_int i; |
| 1168 | u_char ch; |
| 1169 | char *s; |
| 1170 | struct escape_filter_ctx *efc; |
| 1171 | |
| 1172 | if (c == NULL((void *)0) || c->filter_ctx == NULL((void *)0) || len <= 0) |
| 1173 | return 0; |
| 1174 | |
| 1175 | efc = (struct escape_filter_ctx *)c->filter_ctx; |
| 1176 | |
| 1177 | for (i = 0; i < (u_int)len; i++) { |
| 1178 | /* Get one character at a time. */ |
| 1179 | ch = buf[i]; |
| 1180 | |
| 1181 | if (efc->escape_pending) { |
| 1182 | /* We have previously seen an escape character. */ |
| 1183 | /* Clear the flag now. */ |
| 1184 | efc->escape_pending = 0; |
| 1185 | |
| 1186 | /* Process the escaped character. */ |
| 1187 | switch (ch) { |
| 1188 | case '.': |
| 1189 | /* Terminate the connection. */ |
| 1190 | if ((r = sshbuf_putf(berr, "%c.\r\n", |
| 1191 | efc->escape_char)) != 0) |
| 1192 | fatal_fr(r, "sshbuf_putf")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1192, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_putf"); |
| 1193 | if (c && c->ctl_chan != -1) { |
| 1194 | channel_force_close(ssh, c, 1); |
| 1195 | return 0; |
| 1196 | } else |
| 1197 | quit_pending = 1; |
| 1198 | return -1; |
| 1199 | |
| 1200 | case 'Z' - 64: |
| 1201 | /* XXX support this for mux clients */ |
| 1202 | if (c && c->ctl_chan != -1) { |
| 1203 | char b[16]; |
| 1204 | noescape: |
| 1205 | if (ch == 'Z' - 64) |
| 1206 | snprintf(b, sizeof b, "^Z"); |
| 1207 | else |
| 1208 | snprintf(b, sizeof b, "%c", ch); |
| 1209 | if ((r = sshbuf_putf(berr, |
| 1210 | "%c%s escape not available to " |
| 1211 | "multiplexed sessions\r\n", |
| 1212 | efc->escape_char, b)) != 0) |
| 1213 | fatal_fr(r, "sshbuf_putf")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1213, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_putf"); |
| 1214 | continue; |
| 1215 | } |
| 1216 | /* Suspend the program. Inform the user */ |
| 1217 | if ((r = sshbuf_putf(berr, |
| 1218 | "%c^Z [suspend ssh]\r\n", |
| 1219 | efc->escape_char)) != 0) |
| 1220 | fatal_fr(r, "sshbuf_putf")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1220, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_putf"); |
| 1221 | |
| 1222 | /* Restore terminal modes and suspend. */ |
| 1223 | client_suspend_self(bin, bout, berr); |
| 1224 | |
| 1225 | /* We have been continued. */ |
| 1226 | continue; |
| 1227 | |
| 1228 | case 'B': |
| 1229 | if ((r = sshbuf_putf(berr, |
| 1230 | "%cB\r\n", efc->escape_char)) != 0) |
| 1231 | fatal_fr(r, "sshbuf_putf")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1231, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_putf"); |
| 1232 | channel_request_start(ssh, c->self, "break", 0); |
| 1233 | if ((r = sshpkt_put_u32(ssh, 1000)) != 0 || |
| 1234 | (r = sshpkt_send(ssh)) != 0) |
| 1235 | fatal_fr(r, "send packet")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1235, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send packet"); |
| 1236 | continue; |
| 1237 | |
| 1238 | case 'R': |
| 1239 | if (ssh->compat & SSH_BUG_NOREKEY0x00008000) |
| 1240 | logit("Server does not "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1241 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Server does not " "support re-keying" ) |
| 1241 | "support re-keying")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1241 , 0, SYSLOG_LEVEL_INFO, ((void *)0), "Server does not " "support re-keying" ); |
| 1242 | else |
| 1243 | need_rekeying = 1; |
| 1244 | continue; |
| 1245 | |
| 1246 | case 'V': |
| 1247 | /* FALLTHROUGH */ |
| 1248 | case 'v': |
| 1249 | if (c && c->ctl_chan != -1) |
| 1250 | goto noescape; |
| 1251 | if (!log_is_on_stderr()) { |
| 1252 | if ((r = sshbuf_putf(berr, |
| 1253 | "%c%c [Logging to syslog]\r\n", |
| 1254 | efc->escape_char, ch)) != 0) |
| 1255 | fatal_fr(r, "sshbuf_putf")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1255, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_putf"); |
| 1256 | continue; |
| 1257 | } |
| 1258 | if (ch == 'V' && options.log_level > |
| 1259 | SYSLOG_LEVEL_QUIET) |
| 1260 | log_change_level(--options.log_level); |
| 1261 | if (ch == 'v' && options.log_level < |
| 1262 | SYSLOG_LEVEL_DEBUG3) |
| 1263 | log_change_level(++options.log_level); |
| 1264 | if ((r = sshbuf_putf(berr, |
| 1265 | "%c%c [LogLevel %s]\r\n", |
| 1266 | efc->escape_char, ch, |
| 1267 | log_level_name(options.log_level))) != 0) |
| 1268 | fatal_fr(r, "sshbuf_putf")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1268, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_putf"); |
| 1269 | continue; |
| 1270 | |
| 1271 | case '&': |
| 1272 | if (c->ctl_chan != -1) |
| 1273 | goto noescape; |
| 1274 | /* |
| 1275 | * Detach the program (continue to serve |
| 1276 | * connections, but put in background and no |
| 1277 | * more new connections). |
| 1278 | */ |
| 1279 | /* Restore tty modes. */ |
| 1280 | leave_raw_mode( |
| 1281 | options.request_tty == REQUEST_TTY_FORCE3); |
| 1282 | |
| 1283 | /* Stop listening for new connections. */ |
| 1284 | channel_stop_listening(ssh); |
| 1285 | |
| 1286 | if ((r = sshbuf_putf(berr, "%c& " |
| 1287 | "[backgrounded]\n", efc->escape_char)) != 0) |
| 1288 | fatal_fr(r, "sshbuf_putf")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1288, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_putf"); |
| 1289 | |
| 1290 | /* Fork into background. */ |
| 1291 | pid = fork(); |
| 1292 | if (pid == -1) { |
| 1293 | error("fork: %.100s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1293 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "fork: %.100s", strerror ((*__errno()))); |
| 1294 | continue; |
| 1295 | } |
| 1296 | if (pid != 0) { /* This is the parent. */ |
| 1297 | /* The parent just exits. */ |
| 1298 | exit(0); |
| 1299 | } |
| 1300 | /* The child continues serving connections. */ |
| 1301 | /* fake EOF on stdin */ |
| 1302 | if ((r = sshbuf_put_u8(bin, 4)) != 0) |
| 1303 | fatal_fr(r, "sshbuf_put_u8")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1303, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_put_u8"); |
| 1304 | return -1; |
| 1305 | case '?': |
| 1306 | print_escape_help(berr, efc->escape_char, |
| 1307 | (c && c->ctl_chan != -1), |
| 1308 | log_is_on_stderr()); |
| 1309 | continue; |
| 1310 | |
| 1311 | case '#': |
| 1312 | if ((r = sshbuf_putf(berr, "%c#\r\n", |
| 1313 | efc->escape_char)) != 0) |
| 1314 | fatal_fr(r, "sshbuf_putf")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1314, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_putf"); |
| 1315 | s = channel_open_message(ssh); |
| 1316 | if ((r = sshbuf_put(berr, s, strlen(s))) != 0) |
| 1317 | fatal_fr(r, "sshbuf_put")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1317, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_put"); |
| 1318 | free(s); |
| 1319 | continue; |
| 1320 | |
| 1321 | case 'C': |
| 1322 | if (c && c->ctl_chan != -1) |
| 1323 | goto noescape; |
| 1324 | if (options.enable_escape_commandline == 0) { |
| 1325 | if ((r = sshbuf_putf(berr, |
| 1326 | "commandline disabled\r\n")) != 0) |
| 1327 | fatal_fr(r, "sshbuf_putf")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1327, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_putf"); |
| 1328 | continue; |
| 1329 | } |
| 1330 | process_cmdline(ssh); |
| 1331 | continue; |
| 1332 | |
| 1333 | default: |
| 1334 | if (ch != efc->escape_char) { |
| 1335 | if ((r = sshbuf_put_u8(bin, |
| 1336 | efc->escape_char)) != 0) |
| 1337 | fatal_fr(r, "sshbuf_put_u8")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1337, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_put_u8"); |
| 1338 | bytes++; |
| 1339 | } |
| 1340 | /* Escaped characters fall through here */ |
| 1341 | break; |
| 1342 | } |
| 1343 | } else { |
| 1344 | /* |
| 1345 | * The previous character was not an escape char. |
| 1346 | * Check if this is an escape. |
| 1347 | */ |
| 1348 | if (last_was_cr && ch == efc->escape_char) { |
| 1349 | /* |
| 1350 | * It is. Set the flag and continue to |
| 1351 | * next character. |
| 1352 | */ |
| 1353 | efc->escape_pending = 1; |
| 1354 | continue; |
| 1355 | } |
| 1356 | } |
| 1357 | |
| 1358 | /* |
| 1359 | * Normal character. Record whether it was a newline, |
| 1360 | * and append it to the buffer. |
| 1361 | */ |
| 1362 | last_was_cr = (ch == '\r' || ch == '\n'); |
| 1363 | if ((r = sshbuf_put_u8(bin, ch)) != 0) |
| 1364 | fatal_fr(r, "sshbuf_put_u8")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1364, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_put_u8"); |
| 1365 | bytes++; |
| 1366 | } |
| 1367 | return bytes; |
| 1368 | } |
| 1369 | |
| 1370 | /* |
| 1371 | * Get packets from the connection input buffer, and process them as long as |
| 1372 | * there are packets available. |
| 1373 | * |
| 1374 | * Any unknown packets received during the actual |
| 1375 | * session cause the session to terminate. This is |
| 1376 | * intended to make debugging easier since no |
| 1377 | * confirmations are sent. Any compatible protocol |
| 1378 | * extensions must be negotiated during the |
| 1379 | * preparatory phase. |
| 1380 | */ |
| 1381 | |
| 1382 | static void |
| 1383 | client_process_buffered_input_packets(struct ssh *ssh) |
| 1384 | { |
| 1385 | ssh_dispatch_run_fatal(ssh, DISPATCH_NONBLOCK, &quit_pending); |
| 1386 | } |
| 1387 | |
| 1388 | /* scan buf[] for '~' before sending data to the peer */ |
| 1389 | |
| 1390 | /* Helper: allocate a new escape_filter_ctx and fill in its escape char */ |
| 1391 | void * |
| 1392 | client_new_escape_filter_ctx(int escape_char) |
| 1393 | { |
| 1394 | struct escape_filter_ctx *ret; |
| 1395 | |
| 1396 | ret = xcalloc(1, sizeof(*ret)); |
| 1397 | ret->escape_pending = 0; |
| 1398 | ret->escape_char = escape_char; |
| 1399 | return (void *)ret; |
| 1400 | } |
| 1401 | |
| 1402 | /* Free the escape filter context on channel free */ |
| 1403 | void |
| 1404 | client_filter_cleanup(struct ssh *ssh, int cid, void *ctx) |
| 1405 | { |
| 1406 | free(ctx); |
| 1407 | } |
| 1408 | |
| 1409 | int |
| 1410 | client_simple_escape_filter(struct ssh *ssh, Channel *c, char *buf, int len) |
| 1411 | { |
| 1412 | if (c->extended_usage != CHAN_EXTENDED_WRITE2) |
| 1413 | return 0; |
| 1414 | |
| 1415 | return process_escapes(ssh, c, c->input, c->output, c->extended, |
| 1416 | buf, len); |
| 1417 | } |
| 1418 | |
| 1419 | static void |
| 1420 | client_channel_closed(struct ssh *ssh, int id, int force, void *arg) |
| 1421 | { |
| 1422 | channel_cancel_cleanup(ssh, id); |
| 1423 | session_closed = 1; |
| 1424 | leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE3); |
| 1425 | } |
| 1426 | |
| 1427 | /* |
| 1428 | * Implements the interactive session with the server. This is called after |
| 1429 | * the user has been authenticated, and a command has been started on the |
| 1430 | * remote host. If escape_char != SSH_ESCAPECHAR_NONE, it is the character |
| 1431 | * used as an escape character for terminating or suspending the session. |
| 1432 | */ |
| 1433 | int |
| 1434 | client_loop(struct ssh *ssh, int have_pty, int escape_char_arg, |
| 1435 | int ssh2_chan_id) |
| 1436 | { |
| 1437 | struct pollfd *pfd = NULL((void *)0); |
| 1438 | u_int npfd_alloc = 0, npfd_active = 0; |
| 1439 | double start_time, total_time; |
| 1440 | int channel_did_enqueue = 0, r, len; |
| 1441 | u_int64_t ibytes, obytes; |
| 1442 | int conn_in_ready, conn_out_ready; |
| 1443 | sigset_t bsigset, osigset; |
| 1444 | |
| 1445 | debug("Entering interactive session.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1445 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Entering interactive session." ); |
| 1446 | session_ident = ssh2_chan_id; |
| 1447 | |
| 1448 | if (options.control_master && |
| 1449 | !option_clear_or_none(options.control_path)) { |
| 1450 | debug("pledge: id")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1450 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "pledge: id"); |
| 1451 | if (pledge("stdio rpath wpath cpath unix inet dns recvfd sendfd proc exec id tty", |
| 1452 | NULL((void *)0)) == -1) |
| 1453 | fatal_f("pledge(): %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1453, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "pledge(): %s", strerror ((*__errno()))); |
| 1454 | |
| 1455 | } else if (options.forward_x11 || options.permit_local_command) { |
| 1456 | debug("pledge: exec")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1456 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "pledge: exec"); |
| 1457 | if (pledge("stdio rpath wpath cpath unix inet dns proc exec tty", |
| 1458 | NULL((void *)0)) == -1) |
| 1459 | fatal_f("pledge(): %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1459, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "pledge(): %s", strerror ((*__errno()))); |
| 1460 | |
| 1461 | } else if (options.update_hostkeys) { |
| 1462 | debug("pledge: filesystem")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1462 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "pledge: filesystem"); |
| 1463 | if (pledge("stdio rpath wpath cpath unix inet dns proc tty", |
| 1464 | NULL((void *)0)) == -1) |
| 1465 | fatal_f("pledge(): %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1465, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "pledge(): %s", strerror ((*__errno()))); |
| 1466 | |
| 1467 | } else if (!option_clear_or_none(options.proxy_command) || |
| 1468 | options.fork_after_authentication) { |
| 1469 | debug("pledge: proc")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1469 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "pledge: proc"); |
| 1470 | if (pledge("stdio cpath unix inet dns proc tty", NULL((void *)0)) == -1) |
| 1471 | fatal_f("pledge(): %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1471, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "pledge(): %s", strerror ((*__errno()))); |
| 1472 | |
| 1473 | } else { |
| 1474 | debug("pledge: network")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1474 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "pledge: network"); |
| 1475 | if (pledge("stdio unix inet dns proc tty", NULL((void *)0)) == -1) |
| 1476 | fatal_f("pledge(): %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1476, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "pledge(): %s", strerror ((*__errno()))); |
| 1477 | } |
| 1478 | |
| 1479 | /* might be able to tighten now */ |
| 1480 | client_repledge(); |
| 1481 | |
| 1482 | start_time = monotime_double(); |
| 1483 | |
| 1484 | /* Initialize variables. */ |
| 1485 | last_was_cr = 1; |
| 1486 | exit_status = -1; |
| 1487 | connection_in = ssh_packet_get_connection_in(ssh); |
| 1488 | connection_out = ssh_packet_get_connection_out(ssh); |
| 1489 | |
| 1490 | quit_pending = 0; |
| 1491 | |
| 1492 | /* Initialize buffer. */ |
| 1493 | if ((stderr_buffer = sshbuf_new()) == NULL((void *)0)) |
| 1494 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1494, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new failed" ); |
| 1495 | |
| 1496 | client_init_dispatch(ssh); |
| 1497 | |
| 1498 | /* |
| 1499 | * Set signal handlers, (e.g. to restore non-blocking mode) |
| 1500 | * but don't overwrite SIG_IGN, matches behaviour from rsh(1) |
| 1501 | */ |
| 1502 | if (ssh_signal(SIGHUP1, SIG_IGN(void (*)(int))1) != SIG_IGN(void (*)(int))1) |
| 1503 | ssh_signal(SIGHUP1, signal_handler); |
| 1504 | if (ssh_signal(SIGINT2, SIG_IGN(void (*)(int))1) != SIG_IGN(void (*)(int))1) |
| 1505 | ssh_signal(SIGINT2, signal_handler); |
| 1506 | if (ssh_signal(SIGQUIT3, SIG_IGN(void (*)(int))1) != SIG_IGN(void (*)(int))1) |
| 1507 | ssh_signal(SIGQUIT3, signal_handler); |
| 1508 | if (ssh_signal(SIGTERM15, SIG_IGN(void (*)(int))1) != SIG_IGN(void (*)(int))1) |
| 1509 | ssh_signal(SIGTERM15, signal_handler); |
| 1510 | ssh_signal(SIGWINCH28, window_change_handler); |
| 1511 | |
| 1512 | if (have_pty) |
| 1513 | enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE3); |
| 1514 | |
| 1515 | if (session_ident != -1) { |
| 1516 | if (escape_char_arg != SSH_ESCAPECHAR_NONE-2) { |
| 1517 | channel_register_filter(ssh, session_ident, |
| 1518 | client_simple_escape_filter, NULL((void *)0), |
| 1519 | client_filter_cleanup, |
| 1520 | client_new_escape_filter_ctx( |
| 1521 | escape_char_arg)); |
| 1522 | } |
| 1523 | channel_register_cleanup(ssh, session_ident, |
| 1524 | client_channel_closed, 0); |
| 1525 | } |
| 1526 | |
| 1527 | schedule_server_alive_check(); |
| 1528 | |
| 1529 | if (sigemptyset(&bsigset) == -1 || |
| 1530 | sigaddset(&bsigset, SIGHUP1) == -1 || |
| 1531 | sigaddset(&bsigset, SIGINT2) == -1 || |
| 1532 | sigaddset(&bsigset, SIGQUIT3) == -1 || |
| 1533 | sigaddset(&bsigset, SIGTERM15) == -1) |
| 1534 | error_f("bsigset setup: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1534 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "bsigset setup: %s", strerror ((*__errno()))); |
| 1535 | |
| 1536 | /* Main loop of the client for the interactive session mode. */ |
| 1537 | while (!quit_pending) { |
| 1538 | channel_did_enqueue = 0; |
| 1539 | |
| 1540 | /* Process buffered packets sent by the server. */ |
| 1541 | client_process_buffered_input_packets(ssh); |
| 1542 | |
| 1543 | if (session_closed && !channel_still_open(ssh)) |
| 1544 | break; |
| 1545 | |
| 1546 | if (ssh_packet_is_rekeying(ssh)) { |
| 1547 | debug("rekeying in progress")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1547 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "rekeying in progress" ); |
| 1548 | } else if (need_rekeying) { |
| 1549 | /* manual rekey request */ |
| 1550 | debug("need rekeying")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1550 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "need rekeying"); |
| 1551 | if ((r = kex_start_rekex(ssh)) != 0) |
| 1552 | fatal_fr(r, "kex_start_rekex")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1552, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "kex_start_rekex"); |
| 1553 | need_rekeying = 0; |
| 1554 | } else { |
| 1555 | /* |
| 1556 | * Make packets from buffered channel data, and |
| 1557 | * enqueue them for sending to the server. |
| 1558 | */ |
| 1559 | if (ssh_packet_not_very_much_data_to_write(ssh)) |
| 1560 | channel_did_enqueue = channel_output_poll(ssh); |
| 1561 | |
| 1562 | /* |
| 1563 | * Check if the window size has changed, and buffer a |
| 1564 | * message about it to the server if so. |
| 1565 | */ |
| 1566 | client_check_window_change(ssh); |
| 1567 | } |
| 1568 | /* |
| 1569 | * Wait until we have something to do (something becomes |
| 1570 | * available on one of the descriptors). |
| 1571 | */ |
| 1572 | if (sigprocmask(SIG_BLOCK1, &bsigset, &osigset) == -1) |
| 1573 | error_f("bsigset sigprocmask: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1573 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "bsigset sigprocmask: %s" , strerror((*__errno()))); |
| 1574 | if (quit_pending) |
| 1575 | break; |
| 1576 | client_wait_until_can_do_something(ssh, &pfd, &npfd_alloc, |
| 1577 | &npfd_active, channel_did_enqueue, &osigset, |
| 1578 | &conn_in_ready, &conn_out_ready); |
| 1579 | if (sigprocmask(SIG_UNBLOCK2, &bsigset, &osigset) == -1) |
| 1580 | error_f("osigset sigprocmask: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1580 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "osigset sigprocmask: %s" , strerror((*__errno()))); |
| 1581 | |
| 1582 | if (quit_pending) |
| 1583 | break; |
| 1584 | |
| 1585 | /* Do channel operations. */ |
| 1586 | channel_after_poll(ssh, pfd, npfd_active); |
| 1587 | |
| 1588 | /* Buffer input from the connection. */ |
| 1589 | if (conn_in_ready) |
| 1590 | client_process_net_input(ssh); |
| 1591 | |
| 1592 | if (quit_pending) |
| 1593 | break; |
| 1594 | |
| 1595 | /* A timeout may have triggered rekeying */ |
| 1596 | if ((r = ssh_packet_check_rekey(ssh)) != 0) |
| 1597 | fatal_fr(r, "cannot start rekeying")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1597, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "cannot start rekeying" ); |
| 1598 | |
| 1599 | /* |
| 1600 | * Send as much buffered packet data as possible to the |
| 1601 | * sender. |
| 1602 | */ |
| 1603 | if (conn_out_ready) { |
| 1604 | if ((r = ssh_packet_write_poll(ssh)) != 0) { |
| 1605 | sshpkt_fatal(ssh, r, |
| 1606 | "%s: ssh_packet_write_poll", __func__); |
| 1607 | } |
| 1608 | } |
| 1609 | |
| 1610 | /* |
| 1611 | * If we are a backgrounded control master, and the |
| 1612 | * timeout has expired without any active client |
| 1613 | * connections, then quit. |
| 1614 | */ |
| 1615 | if (control_persist_exit_time > 0) { |
| 1616 | if (monotime() >= control_persist_exit_time) { |
| 1617 | debug("ControlPersist timeout expired")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1617 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "ControlPersist timeout expired" ); |
| 1618 | break; |
| 1619 | } |
| 1620 | } |
| 1621 | } |
| 1622 | free(pfd); |
| 1623 | |
| 1624 | /* Terminate the session. */ |
| 1625 | |
| 1626 | /* Stop watching for window change. */ |
| 1627 | ssh_signal(SIGWINCH28, SIG_DFL(void (*)(int))0); |
| 1628 | |
| 1629 | if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT1)) != 0 || |
| 1630 | (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_BY_APPLICATION11)) != 0 || |
| 1631 | (r = sshpkt_put_cstring(ssh, "disconnected by user")) != 0 || |
| 1632 | (r = sshpkt_put_cstring(ssh, "")) != 0 || /* language tag */ |
| 1633 | (r = sshpkt_send(ssh)) != 0 || |
| 1634 | (r = ssh_packet_write_wait(ssh)) != 0) |
| 1635 | fatal_fr(r, "send disconnect")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1635, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send disconnect"); |
| 1636 | |
| 1637 | channel_free_all(ssh); |
| 1638 | |
| 1639 | if (have_pty) |
| 1640 | leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE3); |
| 1641 | |
| 1642 | /* |
| 1643 | * If there was no shell or command requested, there will be no remote |
| 1644 | * exit status to be returned. In that case, clear error code if the |
| 1645 | * connection was deliberately terminated at this end. |
| 1646 | */ |
| 1647 | if (options.session_type == SESSION_TYPE_NONE0 && |
| 1648 | received_signal == SIGTERM15) { |
| 1649 | received_signal = 0; |
| 1650 | exit_status = 0; |
| 1651 | } |
| 1652 | |
| 1653 | if (received_signal) { |
| 1654 | verbose("Killed by signal %d.", (int) received_signal)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1654 , 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "Killed by signal %d." , (int) received_signal); |
| 1655 | cleanup_exit(255); |
| 1656 | } |
| 1657 | |
| 1658 | /* |
| 1659 | * In interactive mode (with pseudo tty) display a message indicating |
| 1660 | * that the connection has been closed. |
| 1661 | */ |
| 1662 | if (have_pty && options.log_level >= SYSLOG_LEVEL_INFO) |
| 1663 | quit_message("Connection to %s closed.", host); |
| 1664 | |
| 1665 | /* Output any buffered data for stderr. */ |
| 1666 | if (sshbuf_len(stderr_buffer) > 0) { |
| 1667 | len = atomicio(vwrite(ssize_t (*)(int, void *, size_t))write, fileno(stderr)(!__isthreaded ? (((&__sF[2]))->_file) : (fileno)((& __sF[2]))), |
| 1668 | (u_char *)sshbuf_ptr(stderr_buffer), |
| 1669 | sshbuf_len(stderr_buffer)); |
| 1670 | if (len < 0 || (u_int)len != sshbuf_len(stderr_buffer)) |
| 1671 | error("Write failed flushing stderr buffer.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1671 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Write failed flushing stderr buffer." ); |
| 1672 | else if ((r = sshbuf_consume(stderr_buffer, len)) != 0) |
| 1673 | fatal_fr(r, "sshbuf_consume")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1673, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_consume"); |
| 1674 | } |
| 1675 | |
| 1676 | /* Clear and free any buffers. */ |
| 1677 | sshbuf_free(stderr_buffer); |
| 1678 | |
| 1679 | /* Report bytes transferred, and transfer rates. */ |
| 1680 | total_time = monotime_double() - start_time; |
| 1681 | ssh_packet_get_bytes(ssh, &ibytes, &obytes); |
| 1682 | verbose("Transferred: sent %llu, received %llu bytes, in %.1f seconds",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1683 , 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "Transferred: sent %llu, received %llu bytes, in %.1f seconds" , (unsigned long long)obytes, (unsigned long long)ibytes, total_time ) |
| 1683 | (unsigned long long)obytes, (unsigned long long)ibytes, total_time)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1683 , 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "Transferred: sent %llu, received %llu bytes, in %.1f seconds" , (unsigned long long)obytes, (unsigned long long)ibytes, total_time ); |
| 1684 | if (total_time > 0) |
| 1685 | verbose("Bytes per second: sent %.1f, received %.1f",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1686 , 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "Bytes per second: sent %.1f, received %.1f" , obytes / total_time, ibytes / total_time) |
| 1686 | obytes / total_time, ibytes / total_time)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1686 , 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "Bytes per second: sent %.1f, received %.1f" , obytes / total_time, ibytes / total_time); |
| 1687 | /* Return the exit status of the program. */ |
| 1688 | debug("Exit status %d", exit_status)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1688 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Exit status %d", exit_status ); |
| 1689 | return exit_status; |
| 1690 | } |
| 1691 | |
| 1692 | /*********/ |
| 1693 | |
| 1694 | static Channel * |
| 1695 | client_request_forwarded_tcpip(struct ssh *ssh, const char *request_type, |
| 1696 | int rchan, u_int rwindow, u_int rmaxpack) |
| 1697 | { |
| 1698 | Channel *c = NULL((void *)0); |
| 1699 | struct sshbuf *b = NULL((void *)0); |
| 1700 | char *listen_address, *originator_address; |
| 1701 | u_int listen_port, originator_port; |
| 1702 | int r; |
| 1703 | |
| 1704 | /* Get rest of the packet */ |
| 1705 | if ((r = sshpkt_get_cstring(ssh, &listen_address, NULL((void *)0))) != 0 || |
| 1706 | (r = sshpkt_get_u32(ssh, &listen_port)) != 0 || |
| 1707 | (r = sshpkt_get_cstring(ssh, &originator_address, NULL((void *)0))) != 0 || |
| 1708 | (r = sshpkt_get_u32(ssh, &originator_port)) != 0 || |
| 1709 | (r = sshpkt_get_end(ssh)) != 0) |
| 1710 | fatal_fr(r, "parse packet")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1710, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse packet"); |
| 1711 | |
| 1712 | debug_f("listen %s port %d, originator %s port %d",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1713 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "listen %s port %d, originator %s port %d" , listen_address, listen_port, originator_address, originator_port ) |
| 1713 | listen_address, listen_port, originator_address, originator_port)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1713 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "listen %s port %d, originator %s port %d" , listen_address, listen_port, originator_address, originator_port ); |
| 1714 | |
| 1715 | if (listen_port > 0xffff) |
| 1716 | error_f("invalid listen port")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1716 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "invalid listen port"); |
| 1717 | else if (originator_port > 0xffff) |
| 1718 | error_f("invalid originator port")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1718 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "invalid originator port" ); |
| 1719 | else { |
| 1720 | c = channel_connect_by_listen_address(ssh, |
| 1721 | listen_address, listen_port, "forwarded-tcpip", |
| 1722 | originator_address); |
| 1723 | } |
| 1724 | |
| 1725 | if (c != NULL((void *)0) && c->type == SSH_CHANNEL_MUX_CLIENT16) { |
| 1726 | if ((b = sshbuf_new()) == NULL((void *)0)) { |
| 1727 | error_f("alloc reply")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1727 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "alloc reply"); |
| 1728 | goto out; |
| 1729 | } |
| 1730 | /* reconstruct and send to muxclient */ |
| 1731 | if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */ |
| 1732 | (r = sshbuf_put_u8(b, SSH2_MSG_CHANNEL_OPEN90)) != 0 || |
| 1733 | (r = sshbuf_put_cstring(b, request_type)) != 0 || |
| 1734 | (r = sshbuf_put_u32(b, rchan)) != 0 || |
| 1735 | (r = sshbuf_put_u32(b, rwindow)) != 0 || |
| 1736 | (r = sshbuf_put_u32(b, rmaxpack)) != 0 || |
| 1737 | (r = sshbuf_put_cstring(b, listen_address)) != 0 || |
| 1738 | (r = sshbuf_put_u32(b, listen_port)) != 0 || |
| 1739 | (r = sshbuf_put_cstring(b, originator_address)) != 0 || |
| 1740 | (r = sshbuf_put_u32(b, originator_port)) != 0 || |
| 1741 | (r = sshbuf_put_stringb(c->output, b)) != 0) { |
| 1742 | error_fr(r, "compose for muxclient")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1742 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "compose for muxclient"); |
| 1743 | goto out; |
| 1744 | } |
| 1745 | } |
| 1746 | |
| 1747 | out: |
| 1748 | sshbuf_free(b); |
| 1749 | free(originator_address); |
| 1750 | free(listen_address); |
| 1751 | return c; |
| 1752 | } |
| 1753 | |
| 1754 | static Channel * |
| 1755 | client_request_forwarded_streamlocal(struct ssh *ssh, |
| 1756 | const char *request_type, int rchan) |
| 1757 | { |
| 1758 | Channel *c = NULL((void *)0); |
| 1759 | char *listen_path; |
| 1760 | int r; |
| 1761 | |
| 1762 | /* Get the remote path. */ |
| 1763 | if ((r = sshpkt_get_cstring(ssh, &listen_path, NULL((void *)0))) != 0 || |
| 1764 | (r = sshpkt_get_string(ssh, NULL((void *)0), NULL((void *)0))) != 0 || /* reserved */ |
| 1765 | (r = sshpkt_get_end(ssh)) != 0) |
| 1766 | fatal_fr(r, "parse packet")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1766, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse packet"); |
| 1767 | |
| 1768 | debug_f("request: %s", listen_path)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1768 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "request: %s", listen_path ); |
| 1769 | |
| 1770 | c = channel_connect_by_listen_path(ssh, listen_path, |
| 1771 | "forwarded-streamlocal@openssh.com", "forwarded-streamlocal"); |
| 1772 | free(listen_path); |
| 1773 | return c; |
| 1774 | } |
| 1775 | |
| 1776 | static Channel * |
| 1777 | client_request_x11(struct ssh *ssh, const char *request_type, int rchan) |
| 1778 | { |
| 1779 | Channel *c = NULL((void *)0); |
| 1780 | char *originator; |
| 1781 | u_int originator_port; |
| 1782 | int r, sock; |
| 1783 | |
| 1784 | if (!options.forward_x11) { |
| 1785 | error("Warning: ssh server tried X11 forwarding.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1785 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Warning: ssh server tried X11 forwarding." ); |
| 1786 | error("Warning: this is probably a break-in attempt by a "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1787 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Warning: this is probably a break-in attempt by a " "malicious server.") |
| 1787 | "malicious server.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1787 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Warning: this is probably a break-in attempt by a " "malicious server."); |
| 1788 | return NULL((void *)0); |
| 1789 | } |
| 1790 | if (x11_refuse_time != 0 && monotime() >= x11_refuse_time) { |
| 1791 | verbose("Rejected X11 connection after ForwardX11Timeout "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1792 , 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "Rejected X11 connection after ForwardX11Timeout " "expired") |
| 1792 | "expired")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1792 , 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "Rejected X11 connection after ForwardX11Timeout " "expired"); |
| 1793 | return NULL((void *)0); |
| 1794 | } |
| 1795 | if ((r = sshpkt_get_cstring(ssh, &originator, NULL((void *)0))) != 0 || |
| 1796 | (r = sshpkt_get_u32(ssh, &originator_port)) != 0 || |
| 1797 | (r = sshpkt_get_end(ssh)) != 0) |
| 1798 | fatal_fr(r, "parse packet")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 1798, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse packet"); |
| 1799 | /* XXX check permission */ |
| 1800 | /* XXX range check originator port? */ |
| 1801 | debug("client_request_x11: request from %s %u", originator,sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1802 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "client_request_x11: request from %s %u" , originator, originator_port) |
| 1802 | originator_port)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1802 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "client_request_x11: request from %s %u" , originator, originator_port); |
| 1803 | free(originator); |
| 1804 | sock = x11_connect_display(ssh); |
| 1805 | if (sock < 0) |
| 1806 | return NULL((void *)0); |
| 1807 | c = channel_new(ssh, "x11-connection", |
| 1808 | SSH_CHANNEL_X11_OPEN7, sock, sock, -1, |
| 1809 | CHAN_TCP_WINDOW_DEFAULT(64*(32*1024)), CHAN_X11_PACKET_DEFAULT(16*1024), 0, "x11", 1); |
| 1810 | c->force_drain = 1; |
| 1811 | return c; |
| 1812 | } |
| 1813 | |
| 1814 | static Channel * |
| 1815 | client_request_agent(struct ssh *ssh, const char *request_type, int rchan) |
| 1816 | { |
| 1817 | Channel *c = NULL((void *)0); |
| 1818 | int r, sock; |
| 1819 | |
| 1820 | if (!options.forward_agent) { |
| 1821 | error("Warning: ssh server tried agent forwarding.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1821 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Warning: ssh server tried agent forwarding." ); |
| 1822 | error("Warning: this is probably a break-in attempt by a "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1823 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Warning: this is probably a break-in attempt by a " "malicious server.") |
| 1823 | "malicious server.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1823 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Warning: this is probably a break-in attempt by a " "malicious server."); |
| 1824 | return NULL((void *)0); |
| 1825 | } |
| 1826 | if (forward_agent_sock_path == NULL((void *)0)) { |
| 1827 | r = ssh_get_authentication_socket(&sock); |
| 1828 | } else { |
| 1829 | r = ssh_get_authentication_socket_path(forward_agent_sock_path, &sock); |
| 1830 | } |
| 1831 | if (r != 0) { |
| 1832 | if (r != SSH_ERR_AGENT_NOT_PRESENT-47) |
| 1833 | debug_fr(r, "ssh_get_authentication_socket")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1833 , 1, SYSLOG_LEVEL_DEBUG1, ssh_err(r), "ssh_get_authentication_socket" ); |
| 1834 | return NULL((void *)0); |
| 1835 | } |
| 1836 | if ((r = ssh_agent_bind_hostkey(sock, ssh->kex->initial_hostkey, |
| 1837 | ssh->kex->session_id, ssh->kex->initial_sig, 1)) == 0) |
| 1838 | debug_f("bound agent to hostkey")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1838 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "bound agent to hostkey" ); |
| 1839 | else |
| 1840 | debug2_fr(r, "ssh_agent_bind_hostkey")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1840 , 1, SYSLOG_LEVEL_DEBUG2, ssh_err(r), "ssh_agent_bind_hostkey" ); |
| 1841 | |
| 1842 | c = channel_new(ssh, "agent-connection", |
| 1843 | SSH_CHANNEL_OPEN4, sock, sock, -1, |
| 1844 | CHAN_X11_WINDOW_DEFAULT(4*(16*1024)), CHAN_TCP_PACKET_DEFAULT(32*1024), 0, |
| 1845 | "authentication agent connection", 1); |
| 1846 | c->force_drain = 1; |
| 1847 | return c; |
| 1848 | } |
| 1849 | |
| 1850 | char * |
| 1851 | client_request_tun_fwd(struct ssh *ssh, int tun_mode, |
| 1852 | int local_tun, int remote_tun, channel_open_fn *cb, void *cbctx) |
| 1853 | { |
| 1854 | Channel *c; |
| 1855 | int r, fd; |
| 1856 | char *ifname = NULL((void *)0); |
| 1857 | |
| 1858 | if (tun_mode == SSH_TUNMODE_NO0x00) |
| 1859 | return 0; |
| 1860 | |
| 1861 | debug("Requesting tun unit %d in mode %d", local_tun, tun_mode)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1861 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Requesting tun unit %d in mode %d" , local_tun, tun_mode); |
| 1862 | |
| 1863 | /* Open local tunnel device */ |
| 1864 | if ((fd = tun_open(local_tun, tun_mode, &ifname)) == -1) { |
| 1865 | error("Tunnel device open failed.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1865 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Tunnel device open failed." ); |
| 1866 | return NULL((void *)0); |
| 1867 | } |
| 1868 | debug("Tunnel forwarding using interface %s", ifname)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1868 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Tunnel forwarding using interface %s" , ifname); |
| 1869 | |
| 1870 | c = channel_new(ssh, "tun-connection", SSH_CHANNEL_OPENING3, fd, fd, -1, |
| 1871 | CHAN_TCP_WINDOW_DEFAULT(64*(32*1024)), CHAN_TCP_PACKET_DEFAULT(32*1024), 0, "tun", 1); |
| 1872 | c->datagram = 1; |
| 1873 | |
| 1874 | if (cb != NULL((void *)0)) |
| 1875 | channel_register_open_confirm(ssh, c->self, cb, cbctx); |
| 1876 | |
| 1877 | if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN90)) != 0 || |
| 1878 | (r = sshpkt_put_cstring(ssh, "tun@openssh.com")) != 0 || |
| 1879 | (r = sshpkt_put_u32(ssh, c->self)) != 0 || |
| 1880 | (r = sshpkt_put_u32(ssh, c->local_window_max)) != 0 || |
| 1881 | (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 || |
| 1882 | (r = sshpkt_put_u32(ssh, tun_mode)) != 0 || |
| 1883 | (r = sshpkt_put_u32(ssh, remote_tun)) != 0 || |
| 1884 | (r = sshpkt_send(ssh)) != 0) |
| 1885 | sshpkt_fatal(ssh, r, "%s: send reply", __func__); |
| 1886 | |
| 1887 | return ifname; |
| 1888 | } |
| 1889 | |
| 1890 | /* XXXX move to generic input handler */ |
| 1891 | static int |
| 1892 | client_input_channel_open(int type, u_int32_t seq, struct ssh *ssh) |
| 1893 | { |
| 1894 | Channel *c = NULL((void *)0); |
| 1895 | char *ctype = NULL((void *)0); |
| 1896 | int r; |
| 1897 | u_int rchan; |
| 1898 | size_t len; |
| 1899 | u_int rmaxpack, rwindow; |
| 1900 | |
| 1901 | if ((r = sshpkt_get_cstring(ssh, &ctype, &len)) != 0 || |
| 1902 | (r = sshpkt_get_u32(ssh, &rchan)) != 0 || |
| 1903 | (r = sshpkt_get_u32(ssh, &rwindow)) != 0 || |
| 1904 | (r = sshpkt_get_u32(ssh, &rmaxpack)) != 0) |
| 1905 | goto out; |
| 1906 | |
| 1907 | debug("client_input_channel_open: ctype %s rchan %d win %d max %d",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1908 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "client_input_channel_open: ctype %s rchan %d win %d max %d" , ctype, rchan, rwindow, rmaxpack) |
| 1908 | ctype, rchan, rwindow, rmaxpack)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1908 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "client_input_channel_open: ctype %s rchan %d win %d max %d" , ctype, rchan, rwindow, rmaxpack); |
| 1909 | |
| 1910 | if (strcmp(ctype, "forwarded-tcpip") == 0) { |
| 1911 | c = client_request_forwarded_tcpip(ssh, ctype, rchan, rwindow, |
| 1912 | rmaxpack); |
| 1913 | } else if (strcmp(ctype, "forwarded-streamlocal@openssh.com") == 0) { |
| 1914 | c = client_request_forwarded_streamlocal(ssh, ctype, rchan); |
| 1915 | } else if (strcmp(ctype, "x11") == 0) { |
| 1916 | c = client_request_x11(ssh, ctype, rchan); |
| 1917 | } else if (strcmp(ctype, "auth-agent@openssh.com") == 0) { |
| 1918 | c = client_request_agent(ssh, ctype, rchan); |
| 1919 | } |
| 1920 | if (c != NULL((void *)0) && c->type == SSH_CHANNEL_MUX_CLIENT16) { |
| 1921 | debug3("proxied to downstream: %s", ctype)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1921 , 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "proxied to downstream: %s" , ctype); |
| 1922 | } else if (c != NULL((void *)0)) { |
| 1923 | debug("confirm %s", ctype)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1923 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "confirm %s", ctype); |
| 1924 | c->remote_id = rchan; |
| 1925 | c->have_remote_id = 1; |
| 1926 | c->remote_window = rwindow; |
| 1927 | c->remote_maxpacket = rmaxpack; |
| 1928 | if (c->type != SSH_CHANNEL_CONNECTING12) { |
| 1929 | if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION91)) != 0 || |
| 1930 | (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 || |
| 1931 | (r = sshpkt_put_u32(ssh, c->self)) != 0 || |
| 1932 | (r = sshpkt_put_u32(ssh, c->local_window)) != 0 || |
| 1933 | (r = sshpkt_put_u32(ssh, c->local_maxpacket)) != 0 || |
| 1934 | (r = sshpkt_send(ssh)) != 0) |
| 1935 | sshpkt_fatal(ssh, r, "%s: send reply", __func__); |
| 1936 | } |
| 1937 | } else { |
| 1938 | debug("failure %s", ctype)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1938 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "failure %s", ctype); |
| 1939 | if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE92)) != 0 || |
| 1940 | (r = sshpkt_put_u32(ssh, rchan)) != 0 || |
| 1941 | (r = sshpkt_put_u32(ssh, SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED1)) != 0 || |
| 1942 | (r = sshpkt_put_cstring(ssh, "open failed")) != 0 || |
| 1943 | (r = sshpkt_put_cstring(ssh, "")) != 0 || |
| 1944 | (r = sshpkt_send(ssh)) != 0) |
| 1945 | sshpkt_fatal(ssh, r, "%s: send failure", __func__); |
| 1946 | } |
| 1947 | r = 0; |
| 1948 | out: |
| 1949 | free(ctype); |
| 1950 | return r; |
| 1951 | } |
| 1952 | |
| 1953 | static int |
| 1954 | client_input_channel_req(int type, u_int32_t seq, struct ssh *ssh) |
| 1955 | { |
| 1956 | Channel *c = NULL((void *)0); |
| 1957 | char *rtype = NULL((void *)0); |
| 1958 | u_char reply; |
| 1959 | u_int id, exitval; |
| 1960 | int r, success = 0; |
| 1961 | |
| 1962 | if ((r = sshpkt_get_u32(ssh, &id)) != 0) |
| 1963 | return r; |
| 1964 | if (id <= INT_MAX0x7fffffff) |
| 1965 | c = channel_lookup(ssh, id); |
| 1966 | if (channel_proxy_upstream(c, type, seq, ssh)) |
| 1967 | return 0; |
| 1968 | if ((r = sshpkt_get_cstring(ssh, &rtype, NULL((void *)0))) != 0 || |
| 1969 | (r = sshpkt_get_u8(ssh, &reply)) != 0) |
| 1970 | goto out; |
| 1971 | |
| 1972 | debug("client_input_channel_req: channel %u rtype %s reply %d",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1973 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "client_input_channel_req: channel %u rtype %s reply %d" , id, rtype, reply) |
| 1973 | id, rtype, reply)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1973 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "client_input_channel_req: channel %u rtype %s reply %d" , id, rtype, reply); |
| 1974 | |
| 1975 | if (c == NULL((void *)0)) { |
| 1976 | error("client_input_channel_req: channel %d: "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1977 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "client_input_channel_req: channel %d: " "unknown channel", id) |
| 1977 | "unknown channel", id)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1977 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "client_input_channel_req: channel %d: " "unknown channel", id); |
| 1978 | } else if (strcmp(rtype, "eow@openssh.com") == 0) { |
| 1979 | if ((r = sshpkt_get_end(ssh)) != 0) |
| 1980 | goto out; |
| 1981 | chan_rcvd_eow(ssh, c); |
| 1982 | } else if (strcmp(rtype, "exit-status") == 0) { |
| 1983 | if ((r = sshpkt_get_u32(ssh, &exitval)) != 0) |
| 1984 | goto out; |
| 1985 | if (c->ctl_chan != -1) { |
| 1986 | mux_exit_message(ssh, c, exitval); |
| 1987 | success = 1; |
| 1988 | } else if ((int)id == session_ident) { |
| 1989 | /* Record exit value of local session */ |
| 1990 | success = 1; |
| 1991 | exit_status = exitval; |
| 1992 | } else { |
| 1993 | /* Probably for a mux channel that has already closed */ |
| 1994 | debug_f("no sink for exit-status on channel %d",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1995 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "no sink for exit-status on channel %d" , id) |
| 1995 | id)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 1995 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "no sink for exit-status on channel %d" , id); |
| 1996 | } |
| 1997 | if ((r = sshpkt_get_end(ssh)) != 0) |
| 1998 | goto out; |
| 1999 | } |
| 2000 | if (reply && c != NULL((void *)0) && !(c->flags & CHAN_CLOSE_SENT0x01)) { |
| 2001 | if (!c->have_remote_id) |
| 2002 | fatal_f("channel %d: no remote_id", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2002, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: no remote_id" , c->self); |
| 2003 | if ((r = sshpkt_start(ssh, success ? |
| 2004 | SSH2_MSG_CHANNEL_SUCCESS99 : SSH2_MSG_CHANNEL_FAILURE100)) != 0 || |
| 2005 | (r = sshpkt_put_u32(ssh, c->remote_id)) != 0 || |
| 2006 | (r = sshpkt_send(ssh)) != 0) |
| 2007 | sshpkt_fatal(ssh, r, "%s: send failure", __func__); |
| 2008 | } |
| 2009 | r = 0; |
| 2010 | out: |
| 2011 | free(rtype); |
| 2012 | return r; |
| 2013 | } |
| 2014 | |
| 2015 | struct hostkeys_update_ctx { |
| 2016 | /* The hostname and (optionally) IP address string for the server */ |
| 2017 | char *host_str, *ip_str; |
| 2018 | |
| 2019 | /* |
| 2020 | * Keys received from the server and a flag for each indicating |
| 2021 | * whether they already exist in known_hosts. |
| 2022 | * keys_match is filled in by hostkeys_find() and later (for new |
| 2023 | * keys) by client_global_hostkeys_prove_confirm(). |
| 2024 | */ |
| 2025 | struct sshkey **keys; |
| 2026 | u_int *keys_match; /* mask of HKF_MATCH_* from hostfile.h */ |
| 2027 | int *keys_verified; /* flag for new keys verified by server */ |
| 2028 | size_t nkeys, nnew, nincomplete; /* total, new keys, incomplete match */ |
| 2029 | |
| 2030 | /* |
| 2031 | * Keys that are in known_hosts, but were not present in the update |
| 2032 | * from the server (i.e. scheduled to be deleted). |
| 2033 | * Filled in by hostkeys_find(). |
| 2034 | */ |
| 2035 | struct sshkey **old_keys; |
| 2036 | size_t nold; |
| 2037 | |
| 2038 | /* Various special cases. */ |
| 2039 | int complex_hostspec; /* wildcard or manual pattern-list host name */ |
| 2040 | int ca_available; /* saw CA key for this host */ |
| 2041 | int old_key_seen; /* saw old key with other name/addr */ |
| 2042 | int other_name_seen; /* saw key with other name/addr */ |
| 2043 | }; |
| 2044 | |
| 2045 | static void |
| 2046 | hostkeys_update_ctx_free(struct hostkeys_update_ctx *ctx) |
| 2047 | { |
| 2048 | size_t i; |
| 2049 | |
| 2050 | if (ctx == NULL((void *)0)) |
| 2051 | return; |
| 2052 | for (i = 0; i < ctx->nkeys; i++) |
| 2053 | sshkey_free(ctx->keys[i]); |
| 2054 | free(ctx->keys); |
| 2055 | free(ctx->keys_match); |
| 2056 | free(ctx->keys_verified); |
| 2057 | for (i = 0; i < ctx->nold; i++) |
| 2058 | sshkey_free(ctx->old_keys[i]); |
| 2059 | free(ctx->old_keys); |
| 2060 | free(ctx->host_str); |
| 2061 | free(ctx->ip_str); |
| 2062 | free(ctx); |
| 2063 | } |
| 2064 | |
| 2065 | /* |
| 2066 | * Returns non-zero if a known_hosts hostname list is not of a form that |
| 2067 | * can be handled by UpdateHostkeys. These include wildcard hostnames and |
| 2068 | * hostnames lists that do not follow the form host[,ip]. |
| 2069 | */ |
| 2070 | static int |
| 2071 | hostspec_is_complex(const char *hosts) |
| 2072 | { |
| 2073 | char *cp; |
| 2074 | |
| 2075 | /* wildcard */ |
| 2076 | if (strchr(hosts, '*') != NULL((void *)0) || strchr(hosts, '?') != NULL((void *)0)) |
| 2077 | return 1; |
| 2078 | /* single host/ip = ok */ |
| 2079 | if ((cp = strchr(hosts, ',')) == NULL((void *)0)) |
| 2080 | return 0; |
| 2081 | /* more than two entries on the line */ |
| 2082 | if (strchr(cp + 1, ',') != NULL((void *)0)) |
| 2083 | return 1; |
| 2084 | /* XXX maybe parse cp+1 and ensure it is an IP? */ |
| 2085 | return 0; |
| 2086 | } |
| 2087 | |
| 2088 | /* callback to search for ctx->keys in known_hosts */ |
| 2089 | static int |
| 2090 | hostkeys_find(struct hostkey_foreach_line *l, void *_ctx) |
| 2091 | { |
| 2092 | struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx; |
| 2093 | size_t i; |
| 2094 | struct sshkey **tmp; |
| 2095 | |
| 2096 | if (l->key == NULL((void *)0)) |
| 2097 | return 0; |
| 2098 | if (l->status != HKF_STATUS_MATCHED3) { |
| 2099 | /* Record if one of the keys appears on a non-matching line */ |
| 2100 | for (i = 0; i < ctx->nkeys; i++) { |
| 2101 | if (sshkey_equal(l->key, ctx->keys[i])) { |
| 2102 | ctx->other_name_seen = 1; |
| 2103 | debug3_f("found %s key under different "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2106 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "found %s key under different " "name/addr at %s:%ld", sshkey_ssh_name(ctx->keys[i]), l-> path, l->linenum) |
| 2104 | "name/addr at %s:%ld",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2106 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "found %s key under different " "name/addr at %s:%ld", sshkey_ssh_name(ctx->keys[i]), l-> path, l->linenum) |
| 2105 | sshkey_ssh_name(ctx->keys[i]),sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2106 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "found %s key under different " "name/addr at %s:%ld", sshkey_ssh_name(ctx->keys[i]), l-> path, l->linenum) |
| 2106 | l->path, l->linenum)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2106 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "found %s key under different " "name/addr at %s:%ld", sshkey_ssh_name(ctx->keys[i]), l-> path, l->linenum); |
| 2107 | return 0; |
| 2108 | } |
| 2109 | } |
| 2110 | return 0; |
| 2111 | } |
| 2112 | /* Don't proceed if revocation or CA markers are present */ |
| 2113 | /* XXX relax this */ |
| 2114 | if (l->marker != MRK_NONE) { |
| 2115 | debug3_f("hostkeys file %s:%ld has CA/revocation marker",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2116 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "hostkeys file %s:%ld has CA/revocation marker" , l->path, l->linenum) |
| 2116 | l->path, l->linenum)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2116 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "hostkeys file %s:%ld has CA/revocation marker" , l->path, l->linenum); |
| 2117 | ctx->complex_hostspec = 1; |
| 2118 | return 0; |
| 2119 | } |
| 2120 | |
| 2121 | /* If CheckHostIP is enabled, then check for mismatched hostname/addr */ |
| 2122 | if (ctx->ip_str != NULL((void *)0) && strchr(l->hosts, ',') != NULL((void *)0)) { |
| 2123 | if ((l->match & HKF_MATCH_HOST(1)) == 0) { |
| 2124 | /* Record if address matched a different hostname. */ |
| 2125 | ctx->other_name_seen = 1; |
| 2126 | debug3_f("found address %s against different hostname "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2127 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "found address %s against different hostname " "at %s:%ld", ctx->ip_str, l->path, l->linenum) |
| 2127 | "at %s:%ld", ctx->ip_str, l->path, l->linenum)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2127 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "found address %s against different hostname " "at %s:%ld", ctx->ip_str, l->path, l->linenum); |
| 2128 | return 0; |
| 2129 | } else if ((l->match & HKF_MATCH_IP(1<<1)) == 0) { |
| 2130 | /* Record if hostname matched a different address. */ |
| 2131 | ctx->other_name_seen = 1; |
| 2132 | debug3_f("found hostname %s against different address "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2133 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "found hostname %s against different address " "at %s:%ld", ctx->host_str, l->path, l->linenum) |
| 2133 | "at %s:%ld", ctx->host_str, l->path, l->linenum)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2133 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "found hostname %s against different address " "at %s:%ld", ctx->host_str, l->path, l->linenum); |
| 2134 | } |
| 2135 | } |
| 2136 | |
| 2137 | /* |
| 2138 | * UpdateHostkeys is skipped for wildcard host names and hostnames |
| 2139 | * that contain more than two entries (ssh never writes these). |
| 2140 | */ |
| 2141 | if (hostspec_is_complex(l->hosts)) { |
| 2142 | debug3_f("hostkeys file %s:%ld complex host specification",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2143 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "hostkeys file %s:%ld complex host specification" , l->path, l->linenum) |
| 2143 | l->path, l->linenum)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2143 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "hostkeys file %s:%ld complex host specification" , l->path, l->linenum); |
| 2144 | ctx->complex_hostspec = 1; |
| 2145 | return 0; |
| 2146 | } |
| 2147 | |
| 2148 | /* Mark off keys we've already seen for this host */ |
| 2149 | for (i = 0; i < ctx->nkeys; i++) { |
| 2150 | if (!sshkey_equal(l->key, ctx->keys[i])) |
| 2151 | continue; |
| 2152 | debug3_f("found %s key at %s:%ld",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2153 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "found %s key at %s:%ld" , sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum ) |
| 2153 | sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2153 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "found %s key at %s:%ld" , sshkey_ssh_name(ctx->keys[i]), l->path, l->linenum ); |
| 2154 | ctx->keys_match[i] |= l->match; |
| 2155 | return 0; |
| 2156 | } |
| 2157 | /* This line contained a key that not offered by the server */ |
| 2158 | debug3_f("deprecated %s key at %s:%ld", sshkey_ssh_name(l->key),sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2159 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "deprecated %s key at %s:%ld" , sshkey_ssh_name(l->key), l->path, l->linenum) |
| 2159 | l->path, l->linenum)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2159 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "deprecated %s key at %s:%ld" , sshkey_ssh_name(l->key), l->path, l->linenum); |
| 2160 | if ((tmp = recallocarray(ctx->old_keys, ctx->nold, ctx->nold + 1, |
| 2161 | sizeof(*ctx->old_keys))) == NULL((void *)0)) |
| 2162 | fatal_f("recallocarray failed nold = %zu", ctx->nold)sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2162, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "recallocarray failed nold = %zu" , ctx->nold); |
| 2163 | ctx->old_keys = tmp; |
| 2164 | ctx->old_keys[ctx->nold++] = l->key; |
| 2165 | l->key = NULL((void *)0); |
| 2166 | |
| 2167 | return 0; |
| 2168 | } |
| 2169 | |
| 2170 | /* callback to search for ctx->old_keys in known_hosts under other names */ |
| 2171 | static int |
| 2172 | hostkeys_check_old(struct hostkey_foreach_line *l, void *_ctx) |
| 2173 | { |
| 2174 | struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx; |
| 2175 | size_t i; |
| 2176 | int hashed; |
| 2177 | |
| 2178 | /* only care about lines that *don't* match the active host spec */ |
| 2179 | if (l->status == HKF_STATUS_MATCHED3 || l->key == NULL((void *)0)) |
| 2180 | return 0; |
| 2181 | |
| 2182 | hashed = l->match & (HKF_MATCH_HOST_HASHED(1<<2)|HKF_MATCH_IP_HASHED(1<<3)); |
| 2183 | for (i = 0; i < ctx->nold; i++) { |
| 2184 | if (!sshkey_equal(l->key, ctx->old_keys[i])) |
| 2185 | continue; |
| 2186 | debug3_f("found deprecated %s key at %s:%ld as %s",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2188 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "found deprecated %s key at %s:%ld as %s" , sshkey_ssh_name(ctx->old_keys[i]), l->path, l->linenum , hashed ? "[HASHED]" : l->hosts) |
| 2187 | sshkey_ssh_name(ctx->old_keys[i]), l->path, l->linenum,sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2188 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "found deprecated %s key at %s:%ld as %s" , sshkey_ssh_name(ctx->old_keys[i]), l->path, l->linenum , hashed ? "[HASHED]" : l->hosts) |
| 2188 | hashed ? "[HASHED]" : l->hosts)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2188 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "found deprecated %s key at %s:%ld as %s" , sshkey_ssh_name(ctx->old_keys[i]), l->path, l->linenum , hashed ? "[HASHED]" : l->hosts); |
| 2189 | ctx->old_key_seen = 1; |
| 2190 | break; |
| 2191 | } |
| 2192 | return 0; |
| 2193 | } |
| 2194 | |
| 2195 | /* |
| 2196 | * Check known_hosts files for deprecated keys under other names. Returns 0 |
| 2197 | * on success or -1 on failure. Updates ctx->old_key_seen if deprecated keys |
| 2198 | * exist under names other than the active hostname/IP. |
| 2199 | */ |
| 2200 | static int |
| 2201 | check_old_keys_othernames(struct hostkeys_update_ctx *ctx) |
| 2202 | { |
| 2203 | size_t i; |
| 2204 | int r; |
| 2205 | |
| 2206 | debug2_f("checking for %zu deprecated keys", ctx->nold)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2206 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "checking for %zu deprecated keys" , ctx->nold); |
| 2207 | for (i = 0; i < options.num_user_hostfiles; i++) { |
| 2208 | debug3_f("searching %s for %s / %s",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2210 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "searching %s for %s / %s" , options.user_hostfiles[i], ctx->host_str, ctx->ip_str ? ctx->ip_str : "(none)") |
| 2209 | options.user_hostfiles[i], ctx->host_str,sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2210 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "searching %s for %s / %s" , options.user_hostfiles[i], ctx->host_str, ctx->ip_str ? ctx->ip_str : "(none)") |
| 2210 | ctx->ip_str ? ctx->ip_str : "(none)")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2210 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "searching %s for %s / %s" , options.user_hostfiles[i], ctx->host_str, ctx->ip_str ? ctx->ip_str : "(none)"); |
| 2211 | if ((r = hostkeys_foreach(options.user_hostfiles[i], |
| 2212 | hostkeys_check_old, ctx, ctx->host_str, ctx->ip_str, |
| 2213 | HKF_WANT_PARSE_KEY(1<<1), 0)) != 0) { |
| 2214 | if (r == SSH_ERR_SYSTEM_ERROR-24 && errno(*__errno()) == ENOENT2) { |
| 2215 | debug_f("hostkeys file %s does not exist",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2216 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "hostkeys file %s does not exist" , options.user_hostfiles[i]) |
| 2216 | options.user_hostfiles[i])sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2216 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "hostkeys file %s does not exist" , options.user_hostfiles[i]); |
| 2217 | continue; |
| 2218 | } |
| 2219 | error_fr(r, "hostkeys_foreach failed for %s",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2220 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "hostkeys_foreach failed for %s" , options.user_hostfiles[i]) |
| 2220 | options.user_hostfiles[i])sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2220 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "hostkeys_foreach failed for %s" , options.user_hostfiles[i]); |
| 2221 | return -1; |
| 2222 | } |
| 2223 | } |
| 2224 | return 0; |
| 2225 | } |
| 2226 | |
| 2227 | static void |
| 2228 | hostkey_change_preamble(LogLevel loglevel) |
| 2229 | { |
| 2230 | do_log2(loglevel, "The server has updated its host keys.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2230 , 0, loglevel, ((void *)0), "The server has updated its host keys." ); |
| 2231 | do_log2(loglevel, "These changes were verified by the server's "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2232 , 0, loglevel, ((void *)0), "These changes were verified by the server's " "existing trusted key.") |
| 2232 | "existing trusted key.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2232 , 0, loglevel, ((void *)0), "These changes were verified by the server's " "existing trusted key."); |
| 2233 | } |
| 2234 | |
| 2235 | static void |
| 2236 | update_known_hosts(struct hostkeys_update_ctx *ctx) |
| 2237 | { |
| 2238 | int r, was_raw = 0, first = 1; |
| 2239 | int asking = options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK2; |
| 2240 | LogLevel loglevel = asking ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_VERBOSE; |
| 2241 | char *fp, *response; |
| 2242 | size_t i; |
| 2243 | struct stat sb; |
| 2244 | |
| 2245 | for (i = 0; i < ctx->nkeys; i++) { |
| 2246 | if (!ctx->keys_verified[i]) |
| 2247 | continue; |
| 2248 | if ((fp = sshkey_fingerprint(ctx->keys[i], |
| 2249 | options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL((void *)0)) |
| 2250 | fatal_f("sshkey_fingerprint failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2250, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshkey_fingerprint failed" ); |
| 2251 | if (first && asking) |
| 2252 | hostkey_change_preamble(loglevel); |
| 2253 | do_log2(loglevel, "Learned new hostkey: %s %s",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2254 , 0, loglevel, ((void *)0), "Learned new hostkey: %s %s", sshkey_type (ctx->keys[i]), fp) |
| 2254 | sshkey_type(ctx->keys[i]), fp)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2254 , 0, loglevel, ((void *)0), "Learned new hostkey: %s %s", sshkey_type (ctx->keys[i]), fp); |
| 2255 | first = 0; |
| 2256 | free(fp); |
| 2257 | } |
| 2258 | for (i = 0; i < ctx->nold; i++) { |
| 2259 | if ((fp = sshkey_fingerprint(ctx->old_keys[i], |
| 2260 | options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL((void *)0)) |
| 2261 | fatal_f("sshkey_fingerprint failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2261, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshkey_fingerprint failed" ); |
| 2262 | if (first && asking) |
| 2263 | hostkey_change_preamble(loglevel); |
| 2264 | do_log2(loglevel, "Deprecating obsolete hostkey: %s %s",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2265 , 0, loglevel, ((void *)0), "Deprecating obsolete hostkey: %s %s" , sshkey_type(ctx->old_keys[i]), fp) |
| 2265 | sshkey_type(ctx->old_keys[i]), fp)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2265 , 0, loglevel, ((void *)0), "Deprecating obsolete hostkey: %s %s" , sshkey_type(ctx->old_keys[i]), fp); |
| 2266 | first = 0; |
| 2267 | free(fp); |
| 2268 | } |
| 2269 | if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK2) { |
| 2270 | if (get_saved_tio() != NULL((void *)0)) { |
| 2271 | leave_raw_mode(1); |
| 2272 | was_raw = 1; |
| 2273 | } |
| 2274 | response = NULL((void *)0); |
| 2275 | for (i = 0; !quit_pending && i < 3; i++) { |
| 2276 | free(response); |
| 2277 | response = read_passphrase("Accept updated hostkeys? " |
| 2278 | "(yes/no): ", RP_ECHO0x0001); |
| 2279 | if (response != NULL((void *)0) && strcasecmp(response, "yes") == 0) |
| 2280 | break; |
| 2281 | else if (quit_pending || response == NULL((void *)0) || |
| 2282 | strcasecmp(response, "no") == 0) { |
| 2283 | options.update_hostkeys = 0; |
| 2284 | break; |
| 2285 | } else { |
| 2286 | do_log2(loglevel, "Please enter "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2287 , 0, loglevel, ((void *)0), "Please enter " "\"yes\" or \"no\"" ) |
| 2287 | "\"yes\" or \"no\"")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2287 , 0, loglevel, ((void *)0), "Please enter " "\"yes\" or \"no\"" ); |
| 2288 | } |
| 2289 | } |
| 2290 | if (quit_pending || i >= 3 || response == NULL((void *)0)) |
| 2291 | options.update_hostkeys = 0; |
| 2292 | free(response); |
| 2293 | if (was_raw) |
| 2294 | enter_raw_mode(1); |
| 2295 | } |
| 2296 | if (options.update_hostkeys == 0) |
| 2297 | return; |
| 2298 | /* |
| 2299 | * Now that all the keys are verified, we can go ahead and replace |
| 2300 | * them in known_hosts (assuming SSH_UPDATE_HOSTKEYS_ASK didn't |
| 2301 | * cancel the operation). |
| 2302 | */ |
| 2303 | for (i = 0; i < options.num_user_hostfiles; i++) { |
| 2304 | /* |
| 2305 | * NB. keys are only added to hostfiles[0], for the rest we |
| 2306 | * just delete the hostname entries. |
| 2307 | */ |
| 2308 | if (stat(options.user_hostfiles[i], &sb) != 0) { |
| 2309 | if (errno(*__errno()) == ENOENT2) { |
| 2310 | debug_f("known hosts file %s does not "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2311 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "known hosts file %s does not " "exist", options.user_hostfiles[i]) |
| 2311 | "exist", options.user_hostfiles[i])sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2311 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "known hosts file %s does not " "exist", options.user_hostfiles[i]); |
| 2312 | } else { |
| 2313 | error_f("known hosts file %s "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2315 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "known hosts file %s " "inaccessible: %s" , options.user_hostfiles[i], strerror((*__errno()))) |
| 2314 | "inaccessible: %s",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2315 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "known hosts file %s " "inaccessible: %s" , options.user_hostfiles[i], strerror((*__errno()))) |
| 2315 | options.user_hostfiles[i], strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2315 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "known hosts file %s " "inaccessible: %s" , options.user_hostfiles[i], strerror((*__errno()))); |
| 2316 | } |
| 2317 | continue; |
| 2318 | } |
| 2319 | if ((r = hostfile_replace_entries(options.user_hostfiles[i], |
| 2320 | ctx->host_str, ctx->ip_str, |
| 2321 | i == 0 ? ctx->keys : NULL((void *)0), i == 0 ? ctx->nkeys : 0, |
| 2322 | options.hash_known_hosts, 0, |
| 2323 | options.fingerprint_hash)) != 0) { |
| 2324 | error_fr(r, "hostfile_replace_entries failed for %s",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2325 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "hostfile_replace_entries failed for %s" , options.user_hostfiles[i]) |
| 2325 | options.user_hostfiles[i])sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2325 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "hostfile_replace_entries failed for %s" , options.user_hostfiles[i]); |
| 2326 | } |
| 2327 | } |
| 2328 | } |
| 2329 | |
| 2330 | static void |
| 2331 | client_global_hostkeys_prove_confirm(struct ssh *ssh, int type, |
| 2332 | u_int32_t seq, void *_ctx) |
| 2333 | { |
| 2334 | struct hostkeys_update_ctx *ctx = (struct hostkeys_update_ctx *)_ctx; |
| 2335 | size_t i, ndone; |
| 2336 | struct sshbuf *signdata; |
| 2337 | int r, plaintype; |
| 2338 | const u_char *sig; |
| 2339 | const char *rsa_kexalg = NULL((void *)0); |
| 2340 | char *alg = NULL((void *)0); |
| 2341 | size_t siglen; |
| 2342 | |
| 2343 | if (ctx->nnew == 0) |
| 2344 | fatal_f("ctx->nnew == 0")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2344, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "ctx->nnew == 0" ); /* sanity */ |
| 2345 | if (type != SSH2_MSG_REQUEST_SUCCESS81) { |
| 2346 | error("Server failed to confirm ownership of "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2347 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Server failed to confirm ownership of " "private host keys") |
| 2347 | "private host keys")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2347 , 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Server failed to confirm ownership of " "private host keys"); |
| 2348 | hostkeys_update_ctx_free(ctx); |
| 2349 | return; |
| 2350 | } |
| 2351 | if (sshkey_type_plain(sshkey_type_from_name( |
| 2352 | ssh->kex->hostkey_alg)) == KEY_RSA) |
| 2353 | rsa_kexalg = ssh->kex->hostkey_alg; |
| 2354 | if ((signdata = sshbuf_new()) == NULL((void *)0)) |
| 2355 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2355, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new failed" ); |
| 2356 | /* |
| 2357 | * Expect a signature for each of the ctx->nnew private keys we |
| 2358 | * haven't seen before. They will be in the same order as the |
| 2359 | * ctx->keys where the corresponding ctx->keys_match[i] == 0. |
| 2360 | */ |
| 2361 | for (ndone = i = 0; i < ctx->nkeys; i++) { |
| 2362 | if (ctx->keys_match[i]) |
| 2363 | continue; |
| 2364 | plaintype = sshkey_type_plain(ctx->keys[i]->type); |
| 2365 | /* Prepare data to be signed: session ID, unique string, key */ |
| 2366 | sshbuf_reset(signdata); |
| 2367 | if ( (r = sshbuf_put_cstring(signdata, |
| 2368 | "hostkeys-prove-00@openssh.com")) != 0 || |
| 2369 | (r = sshbuf_put_stringb(signdata, |
| 2370 | ssh->kex->session_id)) != 0 || |
| 2371 | (r = sshkey_puts(ctx->keys[i], signdata)) != 0) |
| 2372 | fatal_fr(r, "compose signdata")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2372, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "compose signdata" ); |
| 2373 | /* Extract and verify signature */ |
| 2374 | if ((r = sshpkt_get_string_direct(ssh, &sig, &siglen)) != 0) { |
| 2375 | error_fr(r, "parse sig")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2375 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse sig"); |
| 2376 | goto out; |
| 2377 | } |
| 2378 | if ((r = sshkey_get_sigtype(sig, siglen, &alg)) != 0) { |
| 2379 | error_fr(r, "server gave unintelligible signature "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2380 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "server gave unintelligible signature " "for %s key %zu", sshkey_type(ctx->keys[i]), i) |
| 2380 | "for %s key %zu", sshkey_type(ctx->keys[i]), i)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2380 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "server gave unintelligible signature " "for %s key %zu", sshkey_type(ctx->keys[i]), i); |
| 2381 | goto out; |
| 2382 | } |
| 2383 | /* |
| 2384 | * Special case for RSA keys: if a RSA hostkey was negotiated, |
| 2385 | * then use its signature type for verification of RSA hostkey |
| 2386 | * proofs. Otherwise, accept only RSA-SHA256/512 signatures. |
| 2387 | */ |
| 2388 | if (plaintype == KEY_RSA && rsa_kexalg == NULL((void *)0) && |
| 2389 | match_pattern_list(alg, HOSTKEY_PROOF_RSA_ALGS"rsa-sha2-512,rsa-sha2-256", 0) != 1) { |
| 2390 | debug_f("server used untrusted RSA signature algorithm "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2391 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "server used untrusted RSA signature algorithm " "%s for key %zu, disregarding", alg, i) |
| 2391 | "%s for key %zu, disregarding", alg, i)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2391 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "server used untrusted RSA signature algorithm " "%s for key %zu, disregarding", alg, i); |
| 2392 | free(alg); |
| 2393 | /* zap the key from the list */ |
| 2394 | sshkey_free(ctx->keys[i]); |
| 2395 | ctx->keys[i] = NULL((void *)0); |
| 2396 | ndone++; |
| 2397 | continue; |
| 2398 | } |
| 2399 | debug3_f("verify %s key %zu using sigalg %s",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2400 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "verify %s key %zu using sigalg %s" , sshkey_type(ctx->keys[i]), i, alg) |
| 2400 | sshkey_type(ctx->keys[i]), i, alg)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2400 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "verify %s key %zu using sigalg %s" , sshkey_type(ctx->keys[i]), i, alg); |
| 2401 | free(alg); |
| 2402 | if ((r = sshkey_verify(ctx->keys[i], sig, siglen, |
| 2403 | sshbuf_ptr(signdata), sshbuf_len(signdata), |
| 2404 | plaintype == KEY_RSA ? rsa_kexalg : NULL((void *)0), 0, NULL((void *)0))) != 0) { |
| 2405 | error_fr(r, "server gave bad signature for %s key %zu",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2406 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "server gave bad signature for %s key %zu" , sshkey_type(ctx->keys[i]), i) |
| 2406 | sshkey_type(ctx->keys[i]), i)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2406 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "server gave bad signature for %s key %zu" , sshkey_type(ctx->keys[i]), i); |
| 2407 | goto out; |
| 2408 | } |
| 2409 | /* Key is good. Mark it as 'seen' */ |
| 2410 | ctx->keys_verified[i] = 1; |
| 2411 | ndone++; |
| 2412 | } |
| 2413 | /* Shouldn't happen */ |
| 2414 | if (ndone != ctx->nnew) |
| 2415 | fatal_f("ndone != ctx->nnew (%zu / %zu)", ndone, ctx->nnew)sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2415, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "ndone != ctx->nnew (%zu / %zu)" , ndone, ctx->nnew); |
| 2416 | if ((r = sshpkt_get_end(ssh)) != 0) { |
Although the value stored to 'r' is used in the enclosing expression, the value is never actually read from 'r' | |
| 2417 | error_f("protocol error")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2417 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "protocol error"); |
| 2418 | goto out; |
| 2419 | } |
| 2420 | |
| 2421 | /* Make the edits to known_hosts */ |
| 2422 | update_known_hosts(ctx); |
| 2423 | out: |
| 2424 | hostkeys_update_ctx_free(ctx); |
| 2425 | hostkeys_update_complete = 1; |
| 2426 | client_repledge(); |
| 2427 | } |
| 2428 | |
| 2429 | /* |
| 2430 | * Returns non-zero if the key is accepted by HostkeyAlgorithms. |
| 2431 | * Made slightly less trivial by the multiple RSA signature algorithm names. |
| 2432 | */ |
| 2433 | static int |
| 2434 | key_accepted_by_hostkeyalgs(const struct sshkey *key) |
| 2435 | { |
| 2436 | const char *ktype = sshkey_ssh_name(key); |
| 2437 | const char *hostkeyalgs = options.hostkeyalgorithms; |
| 2438 | |
| 2439 | if (key->type == KEY_UNSPEC) |
| 2440 | return 0; |
| 2441 | if (key->type == KEY_RSA && |
| 2442 | (match_pattern_list("rsa-sha2-256", hostkeyalgs, 0) == 1 || |
| 2443 | match_pattern_list("rsa-sha2-512", hostkeyalgs, 0) == 1)) |
| 2444 | return 1; |
| 2445 | return match_pattern_list(ktype, hostkeyalgs, 0) == 1; |
| 2446 | } |
| 2447 | |
| 2448 | /* |
| 2449 | * Handle hostkeys-00@openssh.com global request to inform the client of all |
| 2450 | * the server's hostkeys. The keys are checked against the user's |
| 2451 | * HostkeyAlgorithms preference before they are accepted. |
| 2452 | */ |
| 2453 | static int |
| 2454 | client_input_hostkeys(struct ssh *ssh) |
| 2455 | { |
| 2456 | const u_char *blob = NULL((void *)0); |
| 2457 | size_t i, len = 0; |
| 2458 | struct sshbuf *buf = NULL((void *)0); |
| 2459 | struct sshkey *key = NULL((void *)0), **tmp; |
| 2460 | int r, prove_sent = 0; |
| 2461 | char *fp; |
| 2462 | static int hostkeys_seen = 0; /* XXX use struct ssh */ |
| 2463 | extern struct sockaddr_storage hostaddr; /* XXX from ssh.c */ |
| 2464 | struct hostkeys_update_ctx *ctx = NULL((void *)0); |
| 2465 | u_int want; |
| 2466 | |
| 2467 | if (hostkeys_seen) |
| 2468 | fatal_f("server already sent hostkeys")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2468, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "server already sent hostkeys" ); |
| 2469 | if (!can_update_hostkeys()) |
| 2470 | return 1; |
| 2471 | hostkeys_seen = 1; |
| 2472 | |
| 2473 | ctx = xcalloc(1, sizeof(*ctx)); |
| 2474 | while (ssh_packet_remaining(ssh) > 0) { |
| 2475 | sshkey_free(key); |
| 2476 | key = NULL((void *)0); |
| 2477 | if ((r = sshpkt_get_string_direct(ssh, &blob, &len)) != 0) { |
| 2478 | error_fr(r, "parse key")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2478 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse key"); |
| 2479 | goto out; |
| 2480 | } |
| 2481 | if ((r = sshkey_from_blob(blob, len, &key)) != 0) { |
| 2482 | do_log2_fr(r, r == SSH_ERR_KEY_TYPE_UNKNOWN ?sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2484 , 1, r == -14 ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_ERROR, ssh_err (r), "convert key") |
| 2483 | SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_ERROR,sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2484 , 1, r == -14 ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_ERROR, ssh_err (r), "convert key") |
| 2484 | "convert key")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2484 , 1, r == -14 ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_ERROR, ssh_err (r), "convert key"); |
| 2485 | continue; |
| 2486 | } |
| 2487 | fp = sshkey_fingerprint(key, options.fingerprint_hash, |
| 2488 | SSH_FP_DEFAULT); |
| 2489 | debug3_f("received %s key %s", sshkey_type(key), fp)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2489 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "received %s key %s", sshkey_type (key), fp); |
| 2490 | free(fp); |
| 2491 | |
| 2492 | if (!key_accepted_by_hostkeyalgs(key)) { |
| 2493 | debug3_f("%s key not permitted by "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2494 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "%s key not permitted by " "HostkeyAlgorithms", sshkey_ssh_name(key)) |
| 2494 | "HostkeyAlgorithms", sshkey_ssh_name(key))sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2494 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "%s key not permitted by " "HostkeyAlgorithms", sshkey_ssh_name(key)); |
| 2495 | continue; |
| 2496 | } |
| 2497 | /* Skip certs */ |
| 2498 | if (sshkey_is_cert(key)) { |
| 2499 | debug3_f("%s key is a certificate; skipping",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2500 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "%s key is a certificate; skipping" , sshkey_ssh_name(key)) |
| 2500 | sshkey_ssh_name(key))sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2500 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "%s key is a certificate; skipping" , sshkey_ssh_name(key)); |
| 2501 | continue; |
| 2502 | } |
| 2503 | /* Ensure keys are unique */ |
| 2504 | for (i = 0; i < ctx->nkeys; i++) { |
| 2505 | if (sshkey_equal(key, ctx->keys[i])) { |
| 2506 | error_f("received duplicated %s host key",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2507 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "received duplicated %s host key" , sshkey_ssh_name(key)) |
| 2507 | sshkey_ssh_name(key))sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2507 , 1, SYSLOG_LEVEL_ERROR, ((void *)0), "received duplicated %s host key" , sshkey_ssh_name(key)); |
| 2508 | goto out; |
| 2509 | } |
| 2510 | } |
| 2511 | /* Key is good, record it */ |
| 2512 | if ((tmp = recallocarray(ctx->keys, ctx->nkeys, ctx->nkeys + 1, |
| 2513 | sizeof(*ctx->keys))) == NULL((void *)0)) |
| 2514 | fatal_f("recallocarray failed nkeys = %zu",sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2515, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "recallocarray failed nkeys = %zu" , ctx->nkeys) |
| 2515 | ctx->nkeys)sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2515, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "recallocarray failed nkeys = %zu" , ctx->nkeys); |
| 2516 | ctx->keys = tmp; |
| 2517 | ctx->keys[ctx->nkeys++] = key; |
| 2518 | key = NULL((void *)0); |
| 2519 | } |
| 2520 | |
| 2521 | if (ctx->nkeys == 0) { |
| 2522 | debug_f("server sent no hostkeys")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2522 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "server sent no hostkeys" ); |
| 2523 | goto out; |
| 2524 | } |
| 2525 | |
| 2526 | if ((ctx->keys_match = calloc(ctx->nkeys, |
| 2527 | sizeof(*ctx->keys_match))) == NULL((void *)0) || |
| 2528 | (ctx->keys_verified = calloc(ctx->nkeys, |
| 2529 | sizeof(*ctx->keys_verified))) == NULL((void *)0)) |
| 2530 | fatal_f("calloc failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2530, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "calloc failed"); |
| 2531 | |
| 2532 | get_hostfile_hostname_ipaddr(host, |
| 2533 | options.check_host_ip ? (struct sockaddr *)&hostaddr : NULL((void *)0), |
| 2534 | options.port, &ctx->host_str, |
| 2535 | options.check_host_ip ? &ctx->ip_str : NULL((void *)0)); |
| 2536 | |
| 2537 | /* Find which keys we already know about. */ |
| 2538 | for (i = 0; i < options.num_user_hostfiles; i++) { |
| 2539 | debug_f("searching %s for %s / %s",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2541 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "searching %s for %s / %s" , options.user_hostfiles[i], ctx->host_str, ctx->ip_str ? ctx->ip_str : "(none)") |
| 2540 | options.user_hostfiles[i], ctx->host_str,sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2541 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "searching %s for %s / %s" , options.user_hostfiles[i], ctx->host_str, ctx->ip_str ? ctx->ip_str : "(none)") |
| 2541 | ctx->ip_str ? ctx->ip_str : "(none)")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2541 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "searching %s for %s / %s" , options.user_hostfiles[i], ctx->host_str, ctx->ip_str ? ctx->ip_str : "(none)"); |
| 2542 | if ((r = hostkeys_foreach(options.user_hostfiles[i], |
| 2543 | hostkeys_find, ctx, ctx->host_str, ctx->ip_str, |
| 2544 | HKF_WANT_PARSE_KEY(1<<1), 0)) != 0) { |
| 2545 | if (r == SSH_ERR_SYSTEM_ERROR-24 && errno(*__errno()) == ENOENT2) { |
| 2546 | debug_f("hostkeys file %s does not exist",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2547 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "hostkeys file %s does not exist" , options.user_hostfiles[i]) |
| 2547 | options.user_hostfiles[i])sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2547 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "hostkeys file %s does not exist" , options.user_hostfiles[i]); |
| 2548 | continue; |
| 2549 | } |
| 2550 | error_fr(r, "hostkeys_foreach failed for %s",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2551 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "hostkeys_foreach failed for %s" , options.user_hostfiles[i]) |
| 2551 | options.user_hostfiles[i])sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2551 , 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "hostkeys_foreach failed for %s" , options.user_hostfiles[i]); |
| 2552 | goto out; |
| 2553 | } |
| 2554 | } |
| 2555 | |
| 2556 | /* Figure out if we have any new keys to add */ |
| 2557 | ctx->nnew = ctx->nincomplete = 0; |
| 2558 | want = HKF_MATCH_HOST(1) | ( options.check_host_ip ? HKF_MATCH_IP(1<<1) : 0); |
| 2559 | for (i = 0; i < ctx->nkeys; i++) { |
| 2560 | if (ctx->keys_match[i] == 0) |
| 2561 | ctx->nnew++; |
| 2562 | if ((ctx->keys_match[i] & want) != want) |
| 2563 | ctx->nincomplete++; |
| 2564 | } |
| 2565 | |
| 2566 | debug3_f("%zu server keys: %zu new, %zu retained, "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2569 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "%zu server keys: %zu new, %zu retained, " "%zu incomplete match. %zu to remove", ctx->nkeys, ctx-> nnew, ctx->nkeys - ctx->nnew - ctx->nincomplete, ctx ->nincomplete, ctx->nold) |
| 2567 | "%zu incomplete match. %zu to remove", ctx->nkeys, ctx->nnew,sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2569 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "%zu server keys: %zu new, %zu retained, " "%zu incomplete match. %zu to remove", ctx->nkeys, ctx-> nnew, ctx->nkeys - ctx->nnew - ctx->nincomplete, ctx ->nincomplete, ctx->nold) |
| 2568 | ctx->nkeys - ctx->nnew - ctx->nincomplete,sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2569 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "%zu server keys: %zu new, %zu retained, " "%zu incomplete match. %zu to remove", ctx->nkeys, ctx-> nnew, ctx->nkeys - ctx->nnew - ctx->nincomplete, ctx ->nincomplete, ctx->nold) |
| 2569 | ctx->nincomplete, ctx->nold)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2569 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "%zu server keys: %zu new, %zu retained, " "%zu incomplete match. %zu to remove", ctx->nkeys, ctx-> nnew, ctx->nkeys - ctx->nnew - ctx->nincomplete, ctx ->nincomplete, ctx->nold); |
| 2570 | |
| 2571 | if (ctx->nnew == 0 && ctx->nold == 0) { |
| 2572 | debug_f("no new or deprecated keys from server")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2572 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "no new or deprecated keys from server" ); |
| 2573 | goto out; |
| 2574 | } |
| 2575 | |
| 2576 | /* Various reasons why we cannot proceed with the update */ |
| 2577 | if (ctx->complex_hostspec) { |
| 2578 | debug_f("CA/revocation marker, manual host list or wildcard "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2579 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "CA/revocation marker, manual host list or wildcard " "host pattern found, skipping UserKnownHostsFile update") |
| 2579 | "host pattern found, skipping UserKnownHostsFile update")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2579 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "CA/revocation marker, manual host list or wildcard " "host pattern found, skipping UserKnownHostsFile update"); |
| 2580 | goto out; |
| 2581 | } |
| 2582 | if (ctx->other_name_seen) { |
| 2583 | debug_f("host key found matching a different name/address, "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2584 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "host key found matching a different name/address, " "skipping UserKnownHostsFile update") |
| 2584 | "skipping UserKnownHostsFile update")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2584 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "host key found matching a different name/address, " "skipping UserKnownHostsFile update"); |
| 2585 | goto out; |
| 2586 | } |
| 2587 | /* |
| 2588 | * If removing keys, check whether they appear under different |
| 2589 | * names/addresses and refuse to proceed if they do. This avoids |
| 2590 | * cases such as hosts with multiple names becoming inconsistent |
| 2591 | * with regards to CheckHostIP entries. |
| 2592 | * XXX UpdateHostkeys=force to override this (and other) checks? |
| 2593 | */ |
| 2594 | if (ctx->nold != 0) { |
| 2595 | if (check_old_keys_othernames(ctx) != 0) |
| 2596 | goto out; /* error already logged */ |
| 2597 | if (ctx->old_key_seen) { |
| 2598 | debug_f("key(s) for %s%s%s exist under other names; "sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2601 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "key(s) for %s%s%s exist under other names; " "skipping UserKnownHostsFile update", ctx->host_str, ctx-> ip_str == ((void *)0) ? "" : ",", ctx->ip_str == ((void *) 0) ? "" : ctx->ip_str) |
| 2599 | "skipping UserKnownHostsFile update",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2601 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "key(s) for %s%s%s exist under other names; " "skipping UserKnownHostsFile update", ctx->host_str, ctx-> ip_str == ((void *)0) ? "" : ",", ctx->ip_str == ((void *) 0) ? "" : ctx->ip_str) |
| 2600 | ctx->host_str, ctx->ip_str == NULL ? "" : ",",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2601 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "key(s) for %s%s%s exist under other names; " "skipping UserKnownHostsFile update", ctx->host_str, ctx-> ip_str == ((void *)0) ? "" : ",", ctx->ip_str == ((void *) 0) ? "" : ctx->ip_str) |
| 2601 | ctx->ip_str == NULL ? "" : ctx->ip_str)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2601 , 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "key(s) for %s%s%s exist under other names; " "skipping UserKnownHostsFile update", ctx->host_str, ctx-> ip_str == ((void *)0) ? "" : ",", ctx->ip_str == ((void *) 0) ? "" : ctx->ip_str); |
| 2602 | goto out; |
| 2603 | } |
| 2604 | } |
| 2605 | |
| 2606 | if (ctx->nnew == 0) { |
| 2607 | /* |
| 2608 | * We have some keys to remove or fix matching for. |
| 2609 | * We can proceed to do this without requiring a fresh proof |
| 2610 | * from the server. |
| 2611 | */ |
| 2612 | update_known_hosts(ctx); |
| 2613 | goto out; |
| 2614 | } |
| 2615 | /* |
| 2616 | * We have received previously-unseen keys from the server. |
| 2617 | * Ask the server to confirm ownership of the private halves. |
| 2618 | */ |
| 2619 | debug3_f("asking server to prove ownership for %zu keys", ctx->nnew)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2619 , 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "asking server to prove ownership for %zu keys" , ctx->nnew); |
| 2620 | if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST80)) != 0 || |
| 2621 | (r = sshpkt_put_cstring(ssh, |
| 2622 | "hostkeys-prove-00@openssh.com")) != 0 || |
| 2623 | (r = sshpkt_put_u8(ssh, 1)) != 0) /* bool: want reply */ |
| 2624 | fatal_fr(r, "prepare hostkeys-prove")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2624, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "prepare hostkeys-prove" ); |
| 2625 | if ((buf = sshbuf_new()) == NULL((void *)0)) |
| 2626 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2626, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new"); |
| 2627 | for (i = 0; i < ctx->nkeys; i++) { |
| 2628 | if (ctx->keys_match[i]) |
| 2629 | continue; |
| 2630 | sshbuf_reset(buf); |
| 2631 | if ((r = sshkey_putb(ctx->keys[i], buf)) != 0 || |
| 2632 | (r = sshpkt_put_stringb(ssh, buf)) != 0) |
| 2633 | fatal_fr(r, "assemble hostkeys-prove")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2633, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "assemble hostkeys-prove" ); |
| 2634 | } |
| 2635 | if ((r = sshpkt_send(ssh)) != 0) |
| 2636 | fatal_fr(r, "send hostkeys-prove")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2636, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send hostkeys-prove" ); |
| 2637 | client_register_global_confirm( |
| 2638 | client_global_hostkeys_prove_confirm, ctx); |
| 2639 | ctx = NULL((void *)0); /* will be freed in callback */ |
| 2640 | prove_sent = 1; |
| 2641 | |
| 2642 | /* Success */ |
| 2643 | out: |
| 2644 | hostkeys_update_ctx_free(ctx); |
| 2645 | sshkey_free(key); |
| 2646 | sshbuf_free(buf); |
| 2647 | if (!prove_sent) { |
| 2648 | /* UpdateHostkeys handling completed */ |
| 2649 | hostkeys_update_complete = 1; |
| 2650 | client_repledge(); |
| 2651 | } |
| 2652 | /* |
| 2653 | * NB. Return success for all cases. The server doesn't need to know |
| 2654 | * what the client does with its hosts file. |
| 2655 | */ |
| 2656 | return 1; |
| 2657 | } |
| 2658 | |
| 2659 | static int |
| 2660 | client_input_global_request(int type, u_int32_t seq, struct ssh *ssh) |
| 2661 | { |
| 2662 | char *rtype; |
| 2663 | u_char want_reply; |
| 2664 | int r, success = 0; |
| 2665 | |
| 2666 | if ((r = sshpkt_get_cstring(ssh, &rtype, NULL((void *)0))) != 0 || |
| 2667 | (r = sshpkt_get_u8(ssh, &want_reply)) != 0) |
| 2668 | goto out; |
| 2669 | debug("client_input_global_request: rtype %s want_reply %d",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2670 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "client_input_global_request: rtype %s want_reply %d" , rtype, want_reply) |
| 2670 | rtype, want_reply)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2670 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "client_input_global_request: rtype %s want_reply %d" , rtype, want_reply); |
| 2671 | if (strcmp(rtype, "hostkeys-00@openssh.com") == 0) |
| 2672 | success = client_input_hostkeys(ssh); |
| 2673 | if (want_reply) { |
| 2674 | if ((r = sshpkt_start(ssh, success ? SSH2_MSG_REQUEST_SUCCESS81 : |
| 2675 | SSH2_MSG_REQUEST_FAILURE82)) != 0 || |
| 2676 | (r = sshpkt_send(ssh)) != 0 || |
| 2677 | (r = ssh_packet_write_wait(ssh)) != 0) |
| 2678 | goto out; |
| 2679 | } |
| 2680 | r = 0; |
| 2681 | out: |
| 2682 | free(rtype); |
| 2683 | return r; |
| 2684 | } |
| 2685 | |
| 2686 | static void |
| 2687 | client_send_env(struct ssh *ssh, int id, const char *name, const char *val) |
| 2688 | { |
| 2689 | int r; |
| 2690 | |
| 2691 | debug("channel %d: setting env %s = \"%s\"", id, name, val)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2691 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: setting env %s = \"%s\"" , id, name, val); |
| 2692 | channel_request_start(ssh, id, "env", 0); |
| 2693 | if ((r = sshpkt_put_cstring(ssh, name)) != 0 || |
| 2694 | (r = sshpkt_put_cstring(ssh, val)) != 0 || |
| 2695 | (r = sshpkt_send(ssh)) != 0) |
| 2696 | fatal_fr(r, "send setenv")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2696, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send setenv"); |
| 2697 | } |
| 2698 | |
| 2699 | void |
| 2700 | client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem, |
| 2701 | const char *term, struct termios *tiop, int in_fd, struct sshbuf *cmd, |
| 2702 | char **env) |
| 2703 | { |
| 2704 | size_t i, j, len; |
| 2705 | int matched, r; |
| 2706 | char *name, *val; |
| 2707 | Channel *c = NULL((void *)0); |
| 2708 | |
| 2709 | debug2_f("id %d", id)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2709 , 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "id %d", id); |
| 2710 | |
| 2711 | if ((c = channel_lookup(ssh, id)) == NULL((void *)0)) |
| 2712 | fatal_f("channel %d: unknown channel", id)sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2712, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: unknown channel" , id); |
| 2713 | |
| 2714 | ssh_packet_set_interactive(ssh, want_tty, |
| 2715 | options.ip_qos_interactive, options.ip_qos_bulk); |
| 2716 | |
| 2717 | if (want_tty) { |
| 2718 | struct winsize ws; |
| 2719 | |
| 2720 | /* Store window size in the packet. */ |
| 2721 | if (ioctl(in_fd, TIOCGWINSZ((unsigned long)0x40000000 | ((sizeof(struct winsize) & 0x1fff ) << 16) | ((('t')) << 8) | ((104))), &ws) == -1) |
| 2722 | memset(&ws, 0, sizeof(ws)); |
| 2723 | |
| 2724 | channel_request_start(ssh, id, "pty-req", 1); |
| 2725 | client_expect_confirm(ssh, id, "PTY allocation", CONFIRM_TTY); |
| 2726 | if ((r = sshpkt_put_cstring(ssh, term != NULL((void *)0) ? term : "")) |
| 2727 | != 0 || |
| 2728 | (r = sshpkt_put_u32(ssh, (u_int)ws.ws_col)) != 0 || |
| 2729 | (r = sshpkt_put_u32(ssh, (u_int)ws.ws_row)) != 0 || |
| 2730 | (r = sshpkt_put_u32(ssh, (u_int)ws.ws_xpixel)) != 0 || |
| 2731 | (r = sshpkt_put_u32(ssh, (u_int)ws.ws_ypixel)) != 0) |
| 2732 | fatal_fr(r, "build pty-req")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2732, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "build pty-req"); |
| 2733 | if (tiop == NULL((void *)0)) |
| 2734 | tiop = get_saved_tio(); |
| 2735 | ssh_tty_make_modes(ssh, -1, tiop); |
| 2736 | if ((r = sshpkt_send(ssh)) != 0) |
| 2737 | fatal_fr(r, "send pty-req")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2737, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send pty-req"); |
| 2738 | /* XXX wait for reply */ |
| 2739 | c->client_tty = 1; |
| 2740 | } |
| 2741 | |
| 2742 | /* Transfer any environment variables from client to server */ |
| 2743 | if (options.num_send_env != 0 && env != NULL((void *)0)) { |
| 2744 | debug("Sending environment.")sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2744 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Sending environment." ); |
| 2745 | for (i = 0; env[i] != NULL((void *)0); i++) { |
| 2746 | /* Split */ |
| 2747 | name = xstrdup(env[i]); |
| 2748 | if ((val = strchr(name, '=')) == NULL((void *)0)) { |
| 2749 | free(name); |
| 2750 | continue; |
| 2751 | } |
| 2752 | *val++ = '\0'; |
| 2753 | |
| 2754 | matched = 0; |
| 2755 | for (j = 0; j < options.num_send_env; j++) { |
| 2756 | if (match_pattern(name, options.send_env[j])) { |
| 2757 | matched = 1; |
| 2758 | break; |
| 2759 | } |
| 2760 | } |
| 2761 | if (!matched) { |
| 2762 | debug3("Ignored env %s", name)sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2762 , 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "Ignored env %s", name ); |
| 2763 | free(name); |
| 2764 | continue; |
| 2765 | } |
| 2766 | client_send_env(ssh, id, name, val); |
| 2767 | free(name); |
| 2768 | } |
| 2769 | } |
| 2770 | for (i = 0; i < options.num_setenv; i++) { |
| 2771 | /* Split */ |
| 2772 | name = xstrdup(options.setenv[i]); |
| 2773 | if ((val = strchr(name, '=')) == NULL((void *)0)) { |
| 2774 | free(name); |
| 2775 | continue; |
| 2776 | } |
| 2777 | *val++ = '\0'; |
| 2778 | client_send_env(ssh, id, name, val); |
| 2779 | free(name); |
| 2780 | } |
| 2781 | |
| 2782 | len = sshbuf_len(cmd); |
| 2783 | if (len > 0) { |
| 2784 | if (len > 900) |
| 2785 | len = 900; |
| 2786 | if (want_subsystem) { |
| 2787 | debug("Sending subsystem: %.*s",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2788 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Sending subsystem: %.*s" , (int)len, (const u_char*)sshbuf_ptr(cmd)) |
| 2788 | (int)len, (const u_char*)sshbuf_ptr(cmd))sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2788 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Sending subsystem: %.*s" , (int)len, (const u_char*)sshbuf_ptr(cmd)); |
| 2789 | channel_request_start(ssh, id, "subsystem", 1); |
| 2790 | client_expect_confirm(ssh, id, "subsystem", |
| 2791 | CONFIRM_CLOSE); |
| 2792 | } else { |
| 2793 | debug("Sending command: %.*s",sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2794 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Sending command: %.*s" , (int)len, (const u_char*)sshbuf_ptr(cmd)) |
| 2794 | (int)len, (const u_char*)sshbuf_ptr(cmd))sshlog("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__, 2794 , 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Sending command: %.*s" , (int)len, (const u_char*)sshbuf_ptr(cmd)); |
| 2795 | channel_request_start(ssh, id, "exec", 1); |
| 2796 | client_expect_confirm(ssh, id, "exec", CONFIRM_CLOSE); |
| 2797 | } |
| 2798 | if ((r = sshpkt_put_stringb(ssh, cmd)) != 0 || |
| 2799 | (r = sshpkt_send(ssh)) != 0) |
| 2800 | fatal_fr(r, "send command")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2800, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send command"); |
| 2801 | } else { |
| 2802 | channel_request_start(ssh, id, "shell", 1); |
| 2803 | client_expect_confirm(ssh, id, "shell", CONFIRM_CLOSE); |
| 2804 | if ((r = sshpkt_send(ssh)) != 0) |
| 2805 | fatal_fr(r, "send shell")sshfatal("/usr/src/usr.bin/ssh/ssh/../clientloop.c", __func__ , 2805, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send shell"); |
| 2806 | } |
| 2807 | |
| 2808 | session_setup_complete = 1; |
| 2809 | client_repledge(); |
| 2810 | } |
| 2811 | |
| 2812 | static void |
| 2813 | client_init_dispatch(struct ssh *ssh) |
| 2814 | { |
| 2815 | ssh_dispatch_init(ssh, &dispatch_protocol_error); |
| 2816 | |
| 2817 | ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_CLOSE97, &channel_input_oclose); |
| 2818 | ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_DATA94, &channel_input_data); |
| 2819 | ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EOF96, &channel_input_ieof); |
| 2820 | ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_EXTENDED_DATA95, &channel_input_extended_data); |
| 2821 | ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN90, &client_input_channel_open); |
| 2822 | ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION91, &channel_input_open_confirmation); |
| 2823 | ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN_FAILURE92, &channel_input_open_failure); |
| 2824 | ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_REQUEST98, &client_input_channel_req); |
| 2825 | ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_WINDOW_ADJUST93, &channel_input_window_adjust); |
| 2826 | ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_SUCCESS99, &channel_input_status_confirm); |
| 2827 | ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_FAILURE100, &channel_input_status_confirm); |
| 2828 | ssh_dispatch_set(ssh, SSH2_MSG_GLOBAL_REQUEST80, &client_input_global_request); |
| 2829 | |
| 2830 | /* rekeying */ |
| 2831 | ssh_dispatch_set(ssh, SSH2_MSG_KEXINIT20, &kex_input_kexinit); |
| 2832 | |
| 2833 | /* global request reply messages */ |
| 2834 | ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_FAILURE82, &client_global_request_reply); |
| 2835 | ssh_dispatch_set(ssh, SSH2_MSG_REQUEST_SUCCESS81, &client_global_request_reply); |
| 2836 | } |
| 2837 | |
| 2838 | void |
| 2839 | client_stop_mux(void) |
| 2840 | { |
| 2841 | if (options.control_path != NULL((void *)0) && muxserver_sock != -1) |
| 2842 | unlink(options.control_path); |
| 2843 | /* |
| 2844 | * If we are in persist mode, or don't have a shell, signal that we |
| 2845 | * should close when all active channels are closed. |
| 2846 | */ |
| 2847 | if (options.control_persist || options.session_type == SESSION_TYPE_NONE0) { |
| 2848 | session_closed = 1; |
| 2849 | setproctitle("[stopped mux]"); |
| 2850 | } |
| 2851 | } |
| 2852 | |
| 2853 | /* client specific fatal cleanup */ |
| 2854 | void |
| 2855 | cleanup_exit(int i) |
| 2856 | { |
| 2857 | leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE3); |
| 2858 | if (options.control_path != NULL((void *)0) && muxserver_sock != -1) |
| 2859 | unlink(options.control_path); |
| 2860 | ssh_kill_proxy_command(); |
| 2861 | _exit(i); |
| 2862 | } |