| File: | src/usr.bin/ssh/ssh-keyscan/../packet.c |
| Warning: | line 1671, column 3 Value stored to 'r' is never read |
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| 1 | /* $OpenBSD: packet.c,v 1.304 2022/01/01 01:55:30 jsg 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 | * This file contains code implementing the packet protocol and communication |
| 7 | * with the other side. This same code is used both on client and server side. |
| 8 | * |
| 9 | * As far as I am concerned, the code I have written for this software |
| 10 | * can be used freely for any purpose. Any derived versions of this |
| 11 | * software must be clearly marked as such, and if the derived work is |
| 12 | * incompatible with the protocol description in the RFC file, it must be |
| 13 | * called by a name other than "ssh" or "Secure Shell". |
| 14 | * |
| 15 | * |
| 16 | * SSH2 packet format added by Markus Friedl. |
| 17 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
| 18 | * |
| 19 | * Redistribution and use in source and binary forms, with or without |
| 20 | * modification, are permitted provided that the following conditions |
| 21 | * are met: |
| 22 | * 1. Redistributions of source code must retain the above copyright |
| 23 | * notice, this list of conditions and the following disclaimer. |
| 24 | * 2. Redistributions in binary form must reproduce the above copyright |
| 25 | * notice, this list of conditions and the following disclaimer in the |
| 26 | * documentation and/or other materials provided with the distribution. |
| 27 | * |
| 28 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 29 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 30 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 31 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 32 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 33 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 34 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 35 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 36 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 37 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 38 | */ |
| 39 | |
| 40 | #include <sys/types.h> |
| 41 | #include <sys/queue.h> |
| 42 | #include <sys/socket.h> |
| 43 | #include <sys/time.h> |
| 44 | #include <netinet/in.h> |
| 45 | #include <netinet/ip.h> |
| 46 | |
| 47 | #include <errno(*__errno()).h> |
| 48 | #include <netdb.h> |
| 49 | #include <stdarg.h> |
| 50 | #include <stdio.h> |
| 51 | #include <stdlib.h> |
| 52 | #include <string.h> |
| 53 | #include <unistd.h> |
| 54 | #include <limits.h> |
| 55 | #include <poll.h> |
| 56 | #include <signal.h> |
| 57 | #include <time.h> |
| 58 | |
| 59 | #ifdef WITH_ZLIB1 |
| 60 | #include <zlib.h> |
| 61 | #endif |
| 62 | |
| 63 | #include "xmalloc.h" |
| 64 | #include "compat.h" |
| 65 | #include "ssh2.h" |
| 66 | #include "cipher.h" |
| 67 | #include "sshkey.h" |
| 68 | #include "kex.h" |
| 69 | #include "digest.h" |
| 70 | #include "mac.h" |
| 71 | #include "log.h" |
| 72 | #include "canohost.h" |
| 73 | #include "misc.h" |
| 74 | #include "channels.h" |
| 75 | #include "ssh.h" |
| 76 | #include "packet.h" |
| 77 | #include "ssherr.h" |
| 78 | #include "sshbuf.h" |
| 79 | |
| 80 | #ifdef PACKET_DEBUG |
| 81 | #define DBG(x) x |
| 82 | #else |
| 83 | #define DBG(x) |
| 84 | #endif |
| 85 | |
| 86 | #define PACKET_MAX_SIZE(256 * 1024) (256 * 1024) |
| 87 | |
| 88 | struct packet_state { |
| 89 | u_int32_t seqnr; |
| 90 | u_int32_t packets; |
| 91 | u_int64_t blocks; |
| 92 | u_int64_t bytes; |
| 93 | }; |
| 94 | |
| 95 | struct packet { |
| 96 | TAILQ_ENTRY(packet)struct { struct packet *tqe_next; struct packet **tqe_prev; } next; |
| 97 | u_char type; |
| 98 | struct sshbuf *payload; |
| 99 | }; |
| 100 | |
| 101 | struct session_state { |
| 102 | /* |
| 103 | * This variable contains the file descriptors used for |
| 104 | * communicating with the other side. connection_in is used for |
| 105 | * reading; connection_out for writing. These can be the same |
| 106 | * descriptor, in which case it is assumed to be a socket. |
| 107 | */ |
| 108 | int connection_in; |
| 109 | int connection_out; |
| 110 | |
| 111 | /* Protocol flags for the remote side. */ |
| 112 | u_int remote_protocol_flags; |
| 113 | |
| 114 | /* Encryption context for receiving data. Only used for decryption. */ |
| 115 | struct sshcipher_ctx *receive_context; |
| 116 | |
| 117 | /* Encryption context for sending data. Only used for encryption. */ |
| 118 | struct sshcipher_ctx *send_context; |
| 119 | |
| 120 | /* Buffer for raw input data from the socket. */ |
| 121 | struct sshbuf *input; |
| 122 | |
| 123 | /* Buffer for raw output data going to the socket. */ |
| 124 | struct sshbuf *output; |
| 125 | |
| 126 | /* Buffer for the partial outgoing packet being constructed. */ |
| 127 | struct sshbuf *outgoing_packet; |
| 128 | |
| 129 | /* Buffer for the incoming packet currently being processed. */ |
| 130 | struct sshbuf *incoming_packet; |
| 131 | |
| 132 | /* Scratch buffer for packet compression/decompression. */ |
| 133 | struct sshbuf *compression_buffer; |
| 134 | |
| 135 | #ifdef WITH_ZLIB1 |
| 136 | /* Incoming/outgoing compression dictionaries */ |
| 137 | z_stream compression_in_stream; |
| 138 | z_stream compression_out_stream; |
| 139 | #endif |
| 140 | int compression_in_started; |
| 141 | int compression_out_started; |
| 142 | int compression_in_failures; |
| 143 | int compression_out_failures; |
| 144 | |
| 145 | /* default maximum packet size */ |
| 146 | u_int max_packet_size; |
| 147 | |
| 148 | /* Flag indicating whether this module has been initialized. */ |
| 149 | int initialized; |
| 150 | |
| 151 | /* Set to true if the connection is interactive. */ |
| 152 | int interactive_mode; |
| 153 | |
| 154 | /* Set to true if we are the server side. */ |
| 155 | int server_side; |
| 156 | |
| 157 | /* Set to true if we are authenticated. */ |
| 158 | int after_authentication; |
| 159 | |
| 160 | int keep_alive_timeouts; |
| 161 | |
| 162 | /* The maximum time that we will wait to send or receive a packet */ |
| 163 | int packet_timeout_ms; |
| 164 | |
| 165 | /* Session key information for Encryption and MAC */ |
| 166 | struct newkeys *newkeys[MODE_MAX]; |
| 167 | struct packet_state p_read, p_send; |
| 168 | |
| 169 | /* Volume-based rekeying */ |
| 170 | u_int64_t max_blocks_in, max_blocks_out, rekey_limit; |
| 171 | |
| 172 | /* Time-based rekeying */ |
| 173 | u_int32_t rekey_interval; /* how often in seconds */ |
| 174 | time_t rekey_time; /* time of last rekeying */ |
| 175 | |
| 176 | /* roundup current message to extra_pad bytes */ |
| 177 | u_char extra_pad; |
| 178 | |
| 179 | /* XXX discard incoming data after MAC error */ |
| 180 | u_int packet_discard; |
| 181 | size_t packet_discard_mac_already; |
| 182 | struct sshmac *packet_discard_mac; |
| 183 | |
| 184 | /* Used in packet_read_poll2() */ |
| 185 | u_int packlen; |
| 186 | |
| 187 | /* Used in packet_send2 */ |
| 188 | int rekeying; |
| 189 | |
| 190 | /* Used in ssh_packet_send_mux() */ |
| 191 | int mux; |
| 192 | |
| 193 | /* Used in packet_set_interactive */ |
| 194 | int set_interactive_called; |
| 195 | |
| 196 | /* Used in packet_set_maxsize */ |
| 197 | int set_maxsize_called; |
| 198 | |
| 199 | /* One-off warning about weak ciphers */ |
| 200 | int cipher_warning_done; |
| 201 | |
| 202 | /* Hook for fuzzing inbound packets */ |
| 203 | ssh_packet_hook_fn *hook_in; |
| 204 | void *hook_in_ctx; |
| 205 | |
| 206 | TAILQ_HEAD(, packet)struct { struct packet *tqh_first; struct packet **tqh_last; } outgoing; |
| 207 | }; |
| 208 | |
| 209 | struct ssh * |
| 210 | ssh_alloc_session_state(void) |
| 211 | { |
| 212 | struct ssh *ssh = NULL((void*)0); |
| 213 | struct session_state *state = NULL((void*)0); |
| 214 | |
| 215 | if ((ssh = calloc(1, sizeof(*ssh))) == NULL((void*)0) || |
| 216 | (state = calloc(1, sizeof(*state))) == NULL((void*)0) || |
| 217 | (ssh->kex = kex_new()) == NULL((void*)0) || |
| 218 | (state->input = sshbuf_new()) == NULL((void*)0) || |
| 219 | (state->output = sshbuf_new()) == NULL((void*)0) || |
| 220 | (state->outgoing_packet = sshbuf_new()) == NULL((void*)0) || |
| 221 | (state->incoming_packet = sshbuf_new()) == NULL((void*)0)) |
| 222 | goto fail; |
| 223 | TAILQ_INIT(&state->outgoing)do { (&state->outgoing)->tqh_first = ((void*)0); (& state->outgoing)->tqh_last = &(&state->outgoing )->tqh_first; } while (0); |
| 224 | TAILQ_INIT(&ssh->private_keys)do { (&ssh->private_keys)->tqh_first = ((void*)0); ( &ssh->private_keys)->tqh_last = &(&ssh-> private_keys)->tqh_first; } while (0); |
| 225 | TAILQ_INIT(&ssh->public_keys)do { (&ssh->public_keys)->tqh_first = ((void*)0); ( &ssh->public_keys)->tqh_last = &(&ssh->public_keys )->tqh_first; } while (0); |
| 226 | state->connection_in = -1; |
| 227 | state->connection_out = -1; |
| 228 | state->max_packet_size = 32768; |
| 229 | state->packet_timeout_ms = -1; |
| 230 | state->p_send.packets = state->p_read.packets = 0; |
| 231 | state->initialized = 1; |
| 232 | /* |
| 233 | * ssh_packet_send2() needs to queue packets until |
| 234 | * we've done the initial key exchange. |
| 235 | */ |
| 236 | state->rekeying = 1; |
| 237 | ssh->state = state; |
| 238 | return ssh; |
| 239 | fail: |
| 240 | if (ssh) { |
| 241 | kex_free(ssh->kex); |
| 242 | free(ssh); |
| 243 | } |
| 244 | if (state) { |
| 245 | sshbuf_free(state->input); |
| 246 | sshbuf_free(state->output); |
| 247 | sshbuf_free(state->incoming_packet); |
| 248 | sshbuf_free(state->outgoing_packet); |
| 249 | free(state); |
| 250 | } |
| 251 | return NULL((void*)0); |
| 252 | } |
| 253 | |
| 254 | void |
| 255 | ssh_packet_set_input_hook(struct ssh *ssh, ssh_packet_hook_fn *hook, void *ctx) |
| 256 | { |
| 257 | ssh->state->hook_in = hook; |
| 258 | ssh->state->hook_in_ctx = ctx; |
| 259 | } |
| 260 | |
| 261 | /* Returns nonzero if rekeying is in progress */ |
| 262 | int |
| 263 | ssh_packet_is_rekeying(struct ssh *ssh) |
| 264 | { |
| 265 | return ssh->state->rekeying || |
| 266 | (ssh->kex != NULL((void*)0) && ssh->kex->done == 0); |
| 267 | } |
| 268 | |
| 269 | /* |
| 270 | * Sets the descriptors used for communication. |
| 271 | */ |
| 272 | struct ssh * |
| 273 | ssh_packet_set_connection(struct ssh *ssh, int fd_in, int fd_out) |
| 274 | { |
| 275 | struct session_state *state; |
| 276 | const struct sshcipher *none = cipher_by_name("none"); |
| 277 | int r; |
| 278 | |
| 279 | if (none == NULL((void*)0)) { |
| 280 | error_f("cannot load cipher 'none'")sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 280, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "cannot load cipher 'none'" ); |
| 281 | return NULL((void*)0); |
| 282 | } |
| 283 | if (ssh == NULL((void*)0)) |
| 284 | ssh = ssh_alloc_session_state(); |
| 285 | if (ssh == NULL((void*)0)) { |
| 286 | error_f("could not allocate state")sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 286, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "could not allocate state" ); |
| 287 | return NULL((void*)0); |
| 288 | } |
| 289 | state = ssh->state; |
| 290 | state->connection_in = fd_in; |
| 291 | state->connection_out = fd_out; |
| 292 | if ((r = cipher_init(&state->send_context, none, |
| 293 | (const u_char *)"", 0, NULL((void*)0), 0, CIPHER_ENCRYPT1)) != 0 || |
| 294 | (r = cipher_init(&state->receive_context, none, |
| 295 | (const u_char *)"", 0, NULL((void*)0), 0, CIPHER_DECRYPT0)) != 0) { |
| 296 | error_fr(r, "cipher_init failed")sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 296, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "cipher_init failed" ); |
| 297 | free(ssh); /* XXX need ssh_free_session_state? */ |
| 298 | return NULL((void*)0); |
| 299 | } |
| 300 | state->newkeys[MODE_IN] = state->newkeys[MODE_OUT] = NULL((void*)0); |
| 301 | /* |
| 302 | * Cache the IP address of the remote connection for use in error |
| 303 | * messages that might be generated after the connection has closed. |
| 304 | */ |
| 305 | (void)ssh_remote_ipaddr(ssh); |
| 306 | return ssh; |
| 307 | } |
| 308 | |
| 309 | void |
| 310 | ssh_packet_set_timeout(struct ssh *ssh, int timeout, int count) |
| 311 | { |
| 312 | struct session_state *state = ssh->state; |
| 313 | |
| 314 | if (timeout <= 0 || count <= 0) { |
| 315 | state->packet_timeout_ms = -1; |
| 316 | return; |
| 317 | } |
| 318 | if ((INT_MAX2147483647 / 1000) / count < timeout) |
| 319 | state->packet_timeout_ms = INT_MAX2147483647; |
| 320 | else |
| 321 | state->packet_timeout_ms = timeout * count * 1000; |
| 322 | } |
| 323 | |
| 324 | void |
| 325 | ssh_packet_set_mux(struct ssh *ssh) |
| 326 | { |
| 327 | ssh->state->mux = 1; |
| 328 | ssh->state->rekeying = 0; |
| 329 | kex_free(ssh->kex); |
| 330 | ssh->kex = NULL((void*)0); |
| 331 | } |
| 332 | |
| 333 | int |
| 334 | ssh_packet_get_mux(struct ssh *ssh) |
| 335 | { |
| 336 | return ssh->state->mux; |
| 337 | } |
| 338 | |
| 339 | int |
| 340 | ssh_packet_set_log_preamble(struct ssh *ssh, const char *fmt, ...) |
| 341 | { |
| 342 | va_list args; |
| 343 | int r; |
| 344 | |
| 345 | free(ssh->log_preamble); |
| 346 | if (fmt == NULL((void*)0)) |
| 347 | ssh->log_preamble = NULL((void*)0); |
| 348 | else { |
| 349 | va_start(args, fmt)__builtin_va_start(args, fmt); |
| 350 | r = vasprintf(&ssh->log_preamble, fmt, args); |
| 351 | va_end(args)__builtin_va_end(args); |
| 352 | if (r < 0 || ssh->log_preamble == NULL((void*)0)) |
| 353 | return SSH_ERR_ALLOC_FAIL-2; |
| 354 | } |
| 355 | return 0; |
| 356 | } |
| 357 | |
| 358 | int |
| 359 | ssh_packet_stop_discard(struct ssh *ssh) |
| 360 | { |
| 361 | struct session_state *state = ssh->state; |
| 362 | int r; |
| 363 | |
| 364 | if (state->packet_discard_mac) { |
| 365 | char buf[1024]; |
| 366 | size_t dlen = PACKET_MAX_SIZE(256 * 1024); |
| 367 | |
| 368 | if (dlen > state->packet_discard_mac_already) |
| 369 | dlen -= state->packet_discard_mac_already; |
| 370 | memset(buf, 'a', sizeof(buf)); |
| 371 | while (sshbuf_len(state->incoming_packet) < dlen) |
| 372 | if ((r = sshbuf_put(state->incoming_packet, buf, |
| 373 | sizeof(buf))) != 0) |
| 374 | return r; |
| 375 | (void) mac_compute(state->packet_discard_mac, |
| 376 | state->p_read.seqnr, |
| 377 | sshbuf_ptr(state->incoming_packet), dlen, |
| 378 | NULL((void*)0), 0); |
| 379 | } |
| 380 | logit("Finished discarding for %.200s port %d",sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 381, 0, SYSLOG_LEVEL_INFO, ((void*)0), "Finished discarding for %.200s port %d" , ssh_remote_ipaddr(ssh), ssh_remote_port(ssh)) |
| 381 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh))sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 381, 0, SYSLOG_LEVEL_INFO, ((void*)0), "Finished discarding for %.200s port %d" , ssh_remote_ipaddr(ssh), ssh_remote_port(ssh)); |
| 382 | return SSH_ERR_MAC_INVALID-30; |
| 383 | } |
| 384 | |
| 385 | static int |
| 386 | ssh_packet_start_discard(struct ssh *ssh, struct sshenc *enc, |
| 387 | struct sshmac *mac, size_t mac_already, u_int discard) |
| 388 | { |
| 389 | struct session_state *state = ssh->state; |
| 390 | int r; |
| 391 | |
| 392 | if (enc == NULL((void*)0) || !cipher_is_cbc(enc->cipher) || (mac && mac->etm)) { |
| 393 | if ((r = sshpkt_disconnect(ssh, "Packet corrupt")) != 0) |
| 394 | return r; |
| 395 | return SSH_ERR_MAC_INVALID-30; |
| 396 | } |
| 397 | /* |
| 398 | * Record number of bytes over which the mac has already |
| 399 | * been computed in order to minimize timing attacks. |
| 400 | */ |
| 401 | if (mac && mac->enabled) { |
| 402 | state->packet_discard_mac = mac; |
| 403 | state->packet_discard_mac_already = mac_already; |
| 404 | } |
| 405 | if (sshbuf_len(state->input) >= discard) |
| 406 | return ssh_packet_stop_discard(ssh); |
| 407 | state->packet_discard = discard - sshbuf_len(state->input); |
| 408 | return 0; |
| 409 | } |
| 410 | |
| 411 | /* Returns 1 if remote host is connected via socket, 0 if not. */ |
| 412 | |
| 413 | int |
| 414 | ssh_packet_connection_is_on_socket(struct ssh *ssh) |
| 415 | { |
| 416 | struct session_state *state; |
| 417 | struct sockaddr_storage from, to; |
| 418 | socklen_t fromlen, tolen; |
| 419 | |
| 420 | if (ssh == NULL((void*)0) || ssh->state == NULL((void*)0)) |
| 421 | return 0; |
| 422 | |
| 423 | state = ssh->state; |
| 424 | if (state->connection_in == -1 || state->connection_out == -1) |
| 425 | return 0; |
| 426 | /* filedescriptors in and out are the same, so it's a socket */ |
| 427 | if (state->connection_in == state->connection_out) |
| 428 | return 1; |
| 429 | fromlen = sizeof(from); |
| 430 | memset(&from, 0, sizeof(from)); |
| 431 | if (getpeername(state->connection_in, (struct sockaddr *)&from, |
| 432 | &fromlen) == -1) |
| 433 | return 0; |
| 434 | tolen = sizeof(to); |
| 435 | memset(&to, 0, sizeof(to)); |
| 436 | if (getpeername(state->connection_out, (struct sockaddr *)&to, |
| 437 | &tolen) == -1) |
| 438 | return 0; |
| 439 | if (fromlen != tolen || memcmp(&from, &to, fromlen) != 0) |
| 440 | return 0; |
| 441 | if (from.ss_family != AF_INET2 && from.ss_family != AF_INET624) |
| 442 | return 0; |
| 443 | return 1; |
| 444 | } |
| 445 | |
| 446 | void |
| 447 | ssh_packet_get_bytes(struct ssh *ssh, u_int64_t *ibytes, u_int64_t *obytes) |
| 448 | { |
| 449 | if (ibytes) |
| 450 | *ibytes = ssh->state->p_read.bytes; |
| 451 | if (obytes) |
| 452 | *obytes = ssh->state->p_send.bytes; |
| 453 | } |
| 454 | |
| 455 | int |
| 456 | ssh_packet_connection_af(struct ssh *ssh) |
| 457 | { |
| 458 | return get_sock_af(ssh->state->connection_out); |
| 459 | } |
| 460 | |
| 461 | /* Sets the connection into non-blocking mode. */ |
| 462 | |
| 463 | void |
| 464 | ssh_packet_set_nonblocking(struct ssh *ssh) |
| 465 | { |
| 466 | /* Set the socket into non-blocking mode. */ |
| 467 | set_nonblock(ssh->state->connection_in); |
| 468 | |
| 469 | if (ssh->state->connection_out != ssh->state->connection_in) |
| 470 | set_nonblock(ssh->state->connection_out); |
| 471 | } |
| 472 | |
| 473 | /* Returns the socket used for reading. */ |
| 474 | |
| 475 | int |
| 476 | ssh_packet_get_connection_in(struct ssh *ssh) |
| 477 | { |
| 478 | return ssh->state->connection_in; |
| 479 | } |
| 480 | |
| 481 | /* Returns the descriptor used for writing. */ |
| 482 | |
| 483 | int |
| 484 | ssh_packet_get_connection_out(struct ssh *ssh) |
| 485 | { |
| 486 | return ssh->state->connection_out; |
| 487 | } |
| 488 | |
| 489 | /* |
| 490 | * Returns the IP-address of the remote host as a string. The returned |
| 491 | * string must not be freed. |
| 492 | */ |
| 493 | |
| 494 | const char * |
| 495 | ssh_remote_ipaddr(struct ssh *ssh) |
| 496 | { |
| 497 | int sock; |
| 498 | |
| 499 | /* Check whether we have cached the ipaddr. */ |
| 500 | if (ssh->remote_ipaddr == NULL((void*)0)) { |
| 501 | if (ssh_packet_connection_is_on_socket(ssh)) { |
| 502 | sock = ssh->state->connection_in; |
| 503 | ssh->remote_ipaddr = get_peer_ipaddr(sock); |
| 504 | ssh->remote_port = get_peer_port(sock); |
| 505 | ssh->local_ipaddr = get_local_ipaddr(sock); |
| 506 | ssh->local_port = get_local_port(sock); |
| 507 | } else { |
| 508 | ssh->remote_ipaddr = xstrdup("UNKNOWN"); |
| 509 | ssh->remote_port = 65535; |
| 510 | ssh->local_ipaddr = xstrdup("UNKNOWN"); |
| 511 | ssh->local_port = 65535; |
| 512 | } |
| 513 | } |
| 514 | return ssh->remote_ipaddr; |
| 515 | } |
| 516 | |
| 517 | /* Returns the port number of the remote host. */ |
| 518 | |
| 519 | int |
| 520 | ssh_remote_port(struct ssh *ssh) |
| 521 | { |
| 522 | (void)ssh_remote_ipaddr(ssh); /* Will lookup and cache. */ |
| 523 | return ssh->remote_port; |
| 524 | } |
| 525 | |
| 526 | /* |
| 527 | * Returns the IP-address of the local host as a string. The returned |
| 528 | * string must not be freed. |
| 529 | */ |
| 530 | |
| 531 | const char * |
| 532 | ssh_local_ipaddr(struct ssh *ssh) |
| 533 | { |
| 534 | (void)ssh_remote_ipaddr(ssh); /* Will lookup and cache. */ |
| 535 | return ssh->local_ipaddr; |
| 536 | } |
| 537 | |
| 538 | /* Returns the port number of the local host. */ |
| 539 | |
| 540 | int |
| 541 | ssh_local_port(struct ssh *ssh) |
| 542 | { |
| 543 | (void)ssh_remote_ipaddr(ssh); /* Will lookup and cache. */ |
| 544 | return ssh->local_port; |
| 545 | } |
| 546 | |
| 547 | /* Returns the routing domain of the input socket, or NULL if unavailable */ |
| 548 | const char * |
| 549 | ssh_packet_rdomain_in(struct ssh *ssh) |
| 550 | { |
| 551 | if (ssh->rdomain_in != NULL((void*)0)) |
| 552 | return ssh->rdomain_in; |
| 553 | if (!ssh_packet_connection_is_on_socket(ssh)) |
| 554 | return NULL((void*)0); |
| 555 | ssh->rdomain_in = get_rdomain(ssh->state->connection_in); |
| 556 | return ssh->rdomain_in; |
| 557 | } |
| 558 | |
| 559 | /* Closes the connection and clears and frees internal data structures. */ |
| 560 | |
| 561 | static void |
| 562 | ssh_packet_close_internal(struct ssh *ssh, int do_close) |
| 563 | { |
| 564 | struct session_state *state = ssh->state; |
| 565 | u_int mode; |
| 566 | |
| 567 | if (!state->initialized) |
| 568 | return; |
| 569 | state->initialized = 0; |
| 570 | if (do_close) { |
| 571 | if (state->connection_in == state->connection_out) { |
| 572 | close(state->connection_out); |
| 573 | } else { |
| 574 | close(state->connection_in); |
| 575 | close(state->connection_out); |
| 576 | } |
| 577 | } |
| 578 | sshbuf_free(state->input); |
| 579 | sshbuf_free(state->output); |
| 580 | sshbuf_free(state->outgoing_packet); |
| 581 | sshbuf_free(state->incoming_packet); |
| 582 | for (mode = 0; mode < MODE_MAX; mode++) { |
| 583 | kex_free_newkeys(state->newkeys[mode]); /* current keys */ |
| 584 | state->newkeys[mode] = NULL((void*)0); |
| 585 | ssh_clear_newkeys(ssh, mode); /* next keys */ |
| 586 | } |
| 587 | #ifdef WITH_ZLIB1 |
| 588 | /* compression state is in shared mem, so we can only release it once */ |
| 589 | if (do_close && state->compression_buffer) { |
| 590 | sshbuf_free(state->compression_buffer); |
| 591 | if (state->compression_out_started) { |
| 592 | z_streamp stream = &state->compression_out_stream; |
| 593 | debug("compress outgoing: "sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 598, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "compress outgoing: " "raw data %llu, compressed %llu, factor %.2f", (unsigned long long)stream->total_in, (unsigned long long)stream->total_out , stream->total_in == 0 ? 0.0 : (double) stream->total_out / stream->total_in) |
| 594 | "raw data %llu, compressed %llu, factor %.2f",sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 598, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "compress outgoing: " "raw data %llu, compressed %llu, factor %.2f", (unsigned long long)stream->total_in, (unsigned long long)stream->total_out , stream->total_in == 0 ? 0.0 : (double) stream->total_out / stream->total_in) |
| 595 | (unsigned long long)stream->total_in,sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 598, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "compress outgoing: " "raw data %llu, compressed %llu, factor %.2f", (unsigned long long)stream->total_in, (unsigned long long)stream->total_out , stream->total_in == 0 ? 0.0 : (double) stream->total_out / stream->total_in) |
| 596 | (unsigned long long)stream->total_out,sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 598, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "compress outgoing: " "raw data %llu, compressed %llu, factor %.2f", (unsigned long long)stream->total_in, (unsigned long long)stream->total_out , stream->total_in == 0 ? 0.0 : (double) stream->total_out / stream->total_in) |
| 597 | stream->total_in == 0 ? 0.0 :sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 598, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "compress outgoing: " "raw data %llu, compressed %llu, factor %.2f", (unsigned long long)stream->total_in, (unsigned long long)stream->total_out , stream->total_in == 0 ? 0.0 : (double) stream->total_out / stream->total_in) |
| 598 | (double) stream->total_out / stream->total_in)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 598, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "compress outgoing: " "raw data %llu, compressed %llu, factor %.2f", (unsigned long long)stream->total_in, (unsigned long long)stream->total_out , stream->total_in == 0 ? 0.0 : (double) stream->total_out / stream->total_in); |
| 599 | if (state->compression_out_failures == 0) |
| 600 | deflateEnd(stream); |
| 601 | } |
| 602 | if (state->compression_in_started) { |
| 603 | z_streamp stream = &state->compression_in_stream; |
| 604 | debug("compress incoming: "sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 609, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "compress incoming: " "raw data %llu, compressed %llu, factor %.2f", (unsigned long long)stream->total_out, (unsigned long long)stream->total_in , stream->total_out == 0 ? 0.0 : (double) stream->total_in / stream->total_out) |
| 605 | "raw data %llu, compressed %llu, factor %.2f",sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 609, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "compress incoming: " "raw data %llu, compressed %llu, factor %.2f", (unsigned long long)stream->total_out, (unsigned long long)stream->total_in , stream->total_out == 0 ? 0.0 : (double) stream->total_in / stream->total_out) |
| 606 | (unsigned long long)stream->total_out,sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 609, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "compress incoming: " "raw data %llu, compressed %llu, factor %.2f", (unsigned long long)stream->total_out, (unsigned long long)stream->total_in , stream->total_out == 0 ? 0.0 : (double) stream->total_in / stream->total_out) |
| 607 | (unsigned long long)stream->total_in,sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 609, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "compress incoming: " "raw data %llu, compressed %llu, factor %.2f", (unsigned long long)stream->total_out, (unsigned long long)stream->total_in , stream->total_out == 0 ? 0.0 : (double) stream->total_in / stream->total_out) |
| 608 | stream->total_out == 0 ? 0.0 :sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 609, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "compress incoming: " "raw data %llu, compressed %llu, factor %.2f", (unsigned long long)stream->total_out, (unsigned long long)stream->total_in , stream->total_out == 0 ? 0.0 : (double) stream->total_in / stream->total_out) |
| 609 | (double) stream->total_in / stream->total_out)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 609, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "compress incoming: " "raw data %llu, compressed %llu, factor %.2f", (unsigned long long)stream->total_out, (unsigned long long)stream->total_in , stream->total_out == 0 ? 0.0 : (double) stream->total_in / stream->total_out); |
| 610 | if (state->compression_in_failures == 0) |
| 611 | inflateEnd(stream); |
| 612 | } |
| 613 | } |
| 614 | #endif /* WITH_ZLIB */ |
| 615 | cipher_free(state->send_context); |
| 616 | cipher_free(state->receive_context); |
| 617 | state->send_context = state->receive_context = NULL((void*)0); |
| 618 | if (do_close) { |
| 619 | free(ssh->local_ipaddr); |
| 620 | ssh->local_ipaddr = NULL((void*)0); |
| 621 | free(ssh->remote_ipaddr); |
| 622 | ssh->remote_ipaddr = NULL((void*)0); |
| 623 | free(ssh->state); |
| 624 | ssh->state = NULL((void*)0); |
| 625 | kex_free(ssh->kex); |
| 626 | ssh->kex = NULL((void*)0); |
| 627 | } |
| 628 | } |
| 629 | |
| 630 | void |
| 631 | ssh_packet_close(struct ssh *ssh) |
| 632 | { |
| 633 | ssh_packet_close_internal(ssh, 1); |
| 634 | } |
| 635 | |
| 636 | void |
| 637 | ssh_packet_clear_keys(struct ssh *ssh) |
| 638 | { |
| 639 | ssh_packet_close_internal(ssh, 0); |
| 640 | } |
| 641 | |
| 642 | /* Sets remote side protocol flags. */ |
| 643 | |
| 644 | void |
| 645 | ssh_packet_set_protocol_flags(struct ssh *ssh, u_int protocol_flags) |
| 646 | { |
| 647 | ssh->state->remote_protocol_flags = protocol_flags; |
| 648 | } |
| 649 | |
| 650 | /* Returns the remote protocol flags set earlier by the above function. */ |
| 651 | |
| 652 | u_int |
| 653 | ssh_packet_get_protocol_flags(struct ssh *ssh) |
| 654 | { |
| 655 | return ssh->state->remote_protocol_flags; |
| 656 | } |
| 657 | |
| 658 | /* |
| 659 | * Starts packet compression from the next packet on in both directions. |
| 660 | * Level is compression level 1 (fastest) - 9 (slow, best) as in gzip. |
| 661 | */ |
| 662 | |
| 663 | static int |
| 664 | ssh_packet_init_compression(struct ssh *ssh) |
| 665 | { |
| 666 | if (!ssh->state->compression_buffer && |
| 667 | ((ssh->state->compression_buffer = sshbuf_new()) == NULL((void*)0))) |
| 668 | return SSH_ERR_ALLOC_FAIL-2; |
| 669 | return 0; |
| 670 | } |
| 671 | |
| 672 | #ifdef WITH_ZLIB1 |
| 673 | static int |
| 674 | start_compression_out(struct ssh *ssh, int level) |
| 675 | { |
| 676 | if (level < 1 || level > 9) |
| 677 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 678 | debug("Enabling compression at level %d.", level)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 678, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Enabling compression at level %d." , level); |
| 679 | if (ssh->state->compression_out_started == 1) |
| 680 | deflateEnd(&ssh->state->compression_out_stream); |
| 681 | switch (deflateInit(&ssh->state->compression_out_stream, level)deflateInit_((&ssh->state->compression_out_stream), (level), "1.2.11", (int)sizeof(z_stream))) { |
| 682 | case Z_OK0: |
| 683 | ssh->state->compression_out_started = 1; |
| 684 | break; |
| 685 | case Z_MEM_ERROR(-4): |
| 686 | return SSH_ERR_ALLOC_FAIL-2; |
| 687 | default: |
| 688 | return SSH_ERR_INTERNAL_ERROR-1; |
| 689 | } |
| 690 | return 0; |
| 691 | } |
| 692 | |
| 693 | static int |
| 694 | start_compression_in(struct ssh *ssh) |
| 695 | { |
| 696 | if (ssh->state->compression_in_started == 1) |
| 697 | inflateEnd(&ssh->state->compression_in_stream); |
| 698 | switch (inflateInit(&ssh->state->compression_in_stream)inflateInit_((&ssh->state->compression_in_stream), "1.2.11" , (int)sizeof(z_stream))) { |
| 699 | case Z_OK0: |
| 700 | ssh->state->compression_in_started = 1; |
| 701 | break; |
| 702 | case Z_MEM_ERROR(-4): |
| 703 | return SSH_ERR_ALLOC_FAIL-2; |
| 704 | default: |
| 705 | return SSH_ERR_INTERNAL_ERROR-1; |
| 706 | } |
| 707 | return 0; |
| 708 | } |
| 709 | |
| 710 | /* XXX remove need for separate compression buffer */ |
| 711 | static int |
| 712 | compress_buffer(struct ssh *ssh, struct sshbuf *in, struct sshbuf *out) |
| 713 | { |
| 714 | u_char buf[4096]; |
| 715 | int r, status; |
| 716 | |
| 717 | if (ssh->state->compression_out_started != 1) |
| 718 | return SSH_ERR_INTERNAL_ERROR-1; |
| 719 | |
| 720 | /* This case is not handled below. */ |
| 721 | if (sshbuf_len(in) == 0) |
| 722 | return 0; |
| 723 | |
| 724 | /* Input is the contents of the input buffer. */ |
| 725 | if ((ssh->state->compression_out_stream.next_in = |
| 726 | sshbuf_mutable_ptr(in)) == NULL((void*)0)) |
| 727 | return SSH_ERR_INTERNAL_ERROR-1; |
| 728 | ssh->state->compression_out_stream.avail_in = sshbuf_len(in); |
| 729 | |
| 730 | /* Loop compressing until deflate() returns with avail_out != 0. */ |
| 731 | do { |
| 732 | /* Set up fixed-size output buffer. */ |
| 733 | ssh->state->compression_out_stream.next_out = buf; |
| 734 | ssh->state->compression_out_stream.avail_out = sizeof(buf); |
| 735 | |
| 736 | /* Compress as much data into the buffer as possible. */ |
| 737 | status = deflate(&ssh->state->compression_out_stream, |
| 738 | Z_PARTIAL_FLUSH1); |
| 739 | switch (status) { |
| 740 | case Z_MEM_ERROR(-4): |
| 741 | return SSH_ERR_ALLOC_FAIL-2; |
| 742 | case Z_OK0: |
| 743 | /* Append compressed data to output_buffer. */ |
| 744 | if ((r = sshbuf_put(out, buf, sizeof(buf) - |
| 745 | ssh->state->compression_out_stream.avail_out)) != 0) |
| 746 | return r; |
| 747 | break; |
| 748 | case Z_STREAM_ERROR(-2): |
| 749 | default: |
| 750 | ssh->state->compression_out_failures++; |
| 751 | return SSH_ERR_INVALID_FORMAT-4; |
| 752 | } |
| 753 | } while (ssh->state->compression_out_stream.avail_out == 0); |
| 754 | return 0; |
| 755 | } |
| 756 | |
| 757 | static int |
| 758 | uncompress_buffer(struct ssh *ssh, struct sshbuf *in, struct sshbuf *out) |
| 759 | { |
| 760 | u_char buf[4096]; |
| 761 | int r, status; |
| 762 | |
| 763 | if (ssh->state->compression_in_started != 1) |
| 764 | return SSH_ERR_INTERNAL_ERROR-1; |
| 765 | |
| 766 | if ((ssh->state->compression_in_stream.next_in = |
| 767 | sshbuf_mutable_ptr(in)) == NULL((void*)0)) |
| 768 | return SSH_ERR_INTERNAL_ERROR-1; |
| 769 | ssh->state->compression_in_stream.avail_in = sshbuf_len(in); |
| 770 | |
| 771 | for (;;) { |
| 772 | /* Set up fixed-size output buffer. */ |
| 773 | ssh->state->compression_in_stream.next_out = buf; |
| 774 | ssh->state->compression_in_stream.avail_out = sizeof(buf); |
| 775 | |
| 776 | status = inflate(&ssh->state->compression_in_stream, |
| 777 | Z_PARTIAL_FLUSH1); |
| 778 | switch (status) { |
| 779 | case Z_OK0: |
| 780 | if ((r = sshbuf_put(out, buf, sizeof(buf) - |
| 781 | ssh->state->compression_in_stream.avail_out)) != 0) |
| 782 | return r; |
| 783 | break; |
| 784 | case Z_BUF_ERROR(-5): |
| 785 | /* |
| 786 | * Comments in zlib.h say that we should keep calling |
| 787 | * inflate() until we get an error. This appears to |
| 788 | * be the error that we get. |
| 789 | */ |
| 790 | return 0; |
| 791 | case Z_DATA_ERROR(-3): |
| 792 | return SSH_ERR_INVALID_FORMAT-4; |
| 793 | case Z_MEM_ERROR(-4): |
| 794 | return SSH_ERR_ALLOC_FAIL-2; |
| 795 | case Z_STREAM_ERROR(-2): |
| 796 | default: |
| 797 | ssh->state->compression_in_failures++; |
| 798 | return SSH_ERR_INTERNAL_ERROR-1; |
| 799 | } |
| 800 | } |
| 801 | /* NOTREACHED */ |
| 802 | } |
| 803 | |
| 804 | #else /* WITH_ZLIB */ |
| 805 | |
| 806 | static int |
| 807 | start_compression_out(struct ssh *ssh, int level) |
| 808 | { |
| 809 | return SSH_ERR_INTERNAL_ERROR-1; |
| 810 | } |
| 811 | |
| 812 | static int |
| 813 | start_compression_in(struct ssh *ssh) |
| 814 | { |
| 815 | return SSH_ERR_INTERNAL_ERROR-1; |
| 816 | } |
| 817 | |
| 818 | static int |
| 819 | compress_buffer(struct ssh *ssh, struct sshbuf *in, struct sshbuf *out) |
| 820 | { |
| 821 | return SSH_ERR_INTERNAL_ERROR-1; |
| 822 | } |
| 823 | |
| 824 | static int |
| 825 | uncompress_buffer(struct ssh *ssh, struct sshbuf *in, struct sshbuf *out) |
| 826 | { |
| 827 | return SSH_ERR_INTERNAL_ERROR-1; |
| 828 | } |
| 829 | #endif /* WITH_ZLIB */ |
| 830 | |
| 831 | void |
| 832 | ssh_clear_newkeys(struct ssh *ssh, int mode) |
| 833 | { |
| 834 | if (ssh->kex && ssh->kex->newkeys[mode]) { |
| 835 | kex_free_newkeys(ssh->kex->newkeys[mode]); |
| 836 | ssh->kex->newkeys[mode] = NULL((void*)0); |
| 837 | } |
| 838 | } |
| 839 | |
| 840 | int |
| 841 | ssh_set_newkeys(struct ssh *ssh, int mode) |
| 842 | { |
| 843 | struct session_state *state = ssh->state; |
| 844 | struct sshenc *enc; |
| 845 | struct sshmac *mac; |
| 846 | struct sshcomp *comp; |
| 847 | struct sshcipher_ctx **ccp; |
| 848 | struct packet_state *ps; |
| 849 | u_int64_t *max_blocks; |
| 850 | const char *wmsg; |
| 851 | int r, crypt_type; |
| 852 | const char *dir = mode == MODE_OUT ? "out" : "in"; |
| 853 | |
| 854 | debug2_f("mode %d", mode)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 854, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "mode %d", mode); |
| 855 | |
| 856 | if (mode == MODE_OUT) { |
| 857 | ccp = &state->send_context; |
| 858 | crypt_type = CIPHER_ENCRYPT1; |
| 859 | ps = &state->p_send; |
| 860 | max_blocks = &state->max_blocks_out; |
| 861 | } else { |
| 862 | ccp = &state->receive_context; |
| 863 | crypt_type = CIPHER_DECRYPT0; |
| 864 | ps = &state->p_read; |
| 865 | max_blocks = &state->max_blocks_in; |
| 866 | } |
| 867 | if (state->newkeys[mode] != NULL((void*)0)) { |
| 868 | debug_f("rekeying %s, input %llu bytes %llu blocks, "sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 873, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "rekeying %s, input %llu bytes %llu blocks, " "output %llu bytes %llu blocks", dir, (unsigned long long)state ->p_read.bytes, (unsigned long long)state->p_read.blocks , (unsigned long long)state->p_send.bytes, (unsigned long long )state->p_send.blocks) |
| 869 | "output %llu bytes %llu blocks", dir,sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 873, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "rekeying %s, input %llu bytes %llu blocks, " "output %llu bytes %llu blocks", dir, (unsigned long long)state ->p_read.bytes, (unsigned long long)state->p_read.blocks , (unsigned long long)state->p_send.bytes, (unsigned long long )state->p_send.blocks) |
| 870 | (unsigned long long)state->p_read.bytes,sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 873, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "rekeying %s, input %llu bytes %llu blocks, " "output %llu bytes %llu blocks", dir, (unsigned long long)state ->p_read.bytes, (unsigned long long)state->p_read.blocks , (unsigned long long)state->p_send.bytes, (unsigned long long )state->p_send.blocks) |
| 871 | (unsigned long long)state->p_read.blocks,sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 873, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "rekeying %s, input %llu bytes %llu blocks, " "output %llu bytes %llu blocks", dir, (unsigned long long)state ->p_read.bytes, (unsigned long long)state->p_read.blocks , (unsigned long long)state->p_send.bytes, (unsigned long long )state->p_send.blocks) |
| 872 | (unsigned long long)state->p_send.bytes,sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 873, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "rekeying %s, input %llu bytes %llu blocks, " "output %llu bytes %llu blocks", dir, (unsigned long long)state ->p_read.bytes, (unsigned long long)state->p_read.blocks , (unsigned long long)state->p_send.bytes, (unsigned long long )state->p_send.blocks) |
| 873 | (unsigned long long)state->p_send.blocks)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 873, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "rekeying %s, input %llu bytes %llu blocks, " "output %llu bytes %llu blocks", dir, (unsigned long long)state ->p_read.bytes, (unsigned long long)state->p_read.blocks , (unsigned long long)state->p_send.bytes, (unsigned long long )state->p_send.blocks); |
| 874 | kex_free_newkeys(state->newkeys[mode]); |
| 875 | state->newkeys[mode] = NULL((void*)0); |
| 876 | } |
| 877 | /* note that both bytes and the seqnr are not reset */ |
| 878 | ps->packets = ps->blocks = 0; |
| 879 | /* move newkeys from kex to state */ |
| 880 | if ((state->newkeys[mode] = ssh->kex->newkeys[mode]) == NULL((void*)0)) |
| 881 | return SSH_ERR_INTERNAL_ERROR-1; |
| 882 | ssh->kex->newkeys[mode] = NULL((void*)0); |
| 883 | enc = &state->newkeys[mode]->enc; |
| 884 | mac = &state->newkeys[mode]->mac; |
| 885 | comp = &state->newkeys[mode]->comp; |
| 886 | if (cipher_authlen(enc->cipher) == 0) { |
| 887 | if ((r = mac_init(mac)) != 0) |
| 888 | return r; |
| 889 | } |
| 890 | mac->enabled = 1; |
| 891 | DBG(debug_f("cipher_init: %s", dir)); |
| 892 | cipher_free(*ccp); |
| 893 | *ccp = NULL((void*)0); |
| 894 | if ((r = cipher_init(ccp, enc->cipher, enc->key, enc->key_len, |
| 895 | enc->iv, enc->iv_len, crypt_type)) != 0) |
| 896 | return r; |
| 897 | if (!state->cipher_warning_done && |
| 898 | (wmsg = cipher_warning_message(*ccp)) != NULL((void*)0)) { |
| 899 | error("Warning: %s", wmsg)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 899, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Warning: %s", wmsg ); |
| 900 | state->cipher_warning_done = 1; |
| 901 | } |
| 902 | /* Deleting the keys does not gain extra security */ |
| 903 | /* explicit_bzero(enc->iv, enc->block_size); |
| 904 | explicit_bzero(enc->key, enc->key_len); |
| 905 | explicit_bzero(mac->key, mac->key_len); */ |
| 906 | if ((comp->type == COMP_ZLIB1 || |
| 907 | (comp->type == COMP_DELAYED2 && |
| 908 | state->after_authentication)) && comp->enabled == 0) { |
| 909 | if ((r = ssh_packet_init_compression(ssh)) < 0) |
| 910 | return r; |
| 911 | if (mode == MODE_OUT) { |
| 912 | if ((r = start_compression_out(ssh, 6)) != 0) |
| 913 | return r; |
| 914 | } else { |
| 915 | if ((r = start_compression_in(ssh)) != 0) |
| 916 | return r; |
| 917 | } |
| 918 | comp->enabled = 1; |
| 919 | } |
| 920 | /* |
| 921 | * The 2^(blocksize*2) limit is too expensive for 3DES, |
| 922 | * so enforce a 1GB limit for small blocksizes. |
| 923 | * See RFC4344 section 3.2. |
| 924 | */ |
| 925 | if (enc->block_size >= 16) |
| 926 | *max_blocks = (u_int64_t)1 << (enc->block_size*2); |
| 927 | else |
| 928 | *max_blocks = ((u_int64_t)1 << 30) / enc->block_size; |
| 929 | if (state->rekey_limit) |
| 930 | *max_blocks = MINIMUM(*max_blocks,(((*max_blocks) < (state->rekey_limit / enc->block_size )) ? (*max_blocks) : (state->rekey_limit / enc->block_size )) |
| 931 | state->rekey_limit / enc->block_size)(((*max_blocks) < (state->rekey_limit / enc->block_size )) ? (*max_blocks) : (state->rekey_limit / enc->block_size )); |
| 932 | debug("rekey %s after %llu blocks", dir,sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 933, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "rekey %s after %llu blocks" , dir, (unsigned long long)*max_blocks) |
| 933 | (unsigned long long)*max_blocks)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 933, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "rekey %s after %llu blocks" , dir, (unsigned long long)*max_blocks); |
| 934 | return 0; |
| 935 | } |
| 936 | |
| 937 | #define MAX_PACKETS(1U<<31) (1U<<31) |
| 938 | static int |
| 939 | ssh_packet_need_rekeying(struct ssh *ssh, u_int outbound_packet_len) |
| 940 | { |
| 941 | struct session_state *state = ssh->state; |
| 942 | u_int32_t out_blocks; |
| 943 | |
| 944 | /* XXX client can't cope with rekeying pre-auth */ |
| 945 | if (!state->after_authentication) |
| 946 | return 0; |
| 947 | |
| 948 | /* Haven't keyed yet or KEX in progress. */ |
| 949 | if (ssh_packet_is_rekeying(ssh)) |
| 950 | return 0; |
| 951 | |
| 952 | /* Peer can't rekey */ |
| 953 | if (ssh->compat & SSH_BUG_NOREKEY0x00008000) |
| 954 | return 0; |
| 955 | |
| 956 | /* |
| 957 | * Permit one packet in or out per rekey - this allows us to |
| 958 | * make progress when rekey limits are very small. |
| 959 | */ |
| 960 | if (state->p_send.packets == 0 && state->p_read.packets == 0) |
| 961 | return 0; |
| 962 | |
| 963 | /* Time-based rekeying */ |
| 964 | if (state->rekey_interval != 0 && |
| 965 | (int64_t)state->rekey_time + state->rekey_interval <= monotime()) |
| 966 | return 1; |
| 967 | |
| 968 | /* |
| 969 | * Always rekey when MAX_PACKETS sent in either direction |
| 970 | * As per RFC4344 section 3.1 we do this after 2^31 packets. |
| 971 | */ |
| 972 | if (state->p_send.packets > MAX_PACKETS(1U<<31) || |
| 973 | state->p_read.packets > MAX_PACKETS(1U<<31)) |
| 974 | return 1; |
| 975 | |
| 976 | /* Rekey after (cipher-specific) maximum blocks */ |
| 977 | out_blocks = ROUNDUP(outbound_packet_len,((((outbound_packet_len)+((state->newkeys[MODE_OUT]->enc .block_size)-1))/(state->newkeys[MODE_OUT]->enc.block_size ))*(state->newkeys[MODE_OUT]->enc.block_size)) |
| 978 | state->newkeys[MODE_OUT]->enc.block_size)((((outbound_packet_len)+((state->newkeys[MODE_OUT]->enc .block_size)-1))/(state->newkeys[MODE_OUT]->enc.block_size ))*(state->newkeys[MODE_OUT]->enc.block_size)); |
| 979 | return (state->max_blocks_out && |
| 980 | (state->p_send.blocks + out_blocks > state->max_blocks_out)) || |
| 981 | (state->max_blocks_in && |
| 982 | (state->p_read.blocks > state->max_blocks_in)); |
| 983 | } |
| 984 | |
| 985 | int |
| 986 | ssh_packet_check_rekey(struct ssh *ssh) |
| 987 | { |
| 988 | if (!ssh_packet_need_rekeying(ssh, 0)) |
| 989 | return 0; |
| 990 | debug3_f("rekex triggered")sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 990, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "rekex triggered"); |
| 991 | return kex_start_rekex(ssh); |
| 992 | } |
| 993 | |
| 994 | /* |
| 995 | * Delayed compression for SSH2 is enabled after authentication: |
| 996 | * This happens on the server side after a SSH2_MSG_USERAUTH_SUCCESS is sent, |
| 997 | * and on the client side after a SSH2_MSG_USERAUTH_SUCCESS is received. |
| 998 | */ |
| 999 | static int |
| 1000 | ssh_packet_enable_delayed_compress(struct ssh *ssh) |
| 1001 | { |
| 1002 | struct session_state *state = ssh->state; |
| 1003 | struct sshcomp *comp = NULL((void*)0); |
| 1004 | int r, mode; |
| 1005 | |
| 1006 | /* |
| 1007 | * Remember that we are past the authentication step, so rekeying |
| 1008 | * with COMP_DELAYED will turn on compression immediately. |
| 1009 | */ |
| 1010 | state->after_authentication = 1; |
| 1011 | for (mode = 0; mode < MODE_MAX; mode++) { |
| 1012 | /* protocol error: USERAUTH_SUCCESS received before NEWKEYS */ |
| 1013 | if (state->newkeys[mode] == NULL((void*)0)) |
| 1014 | continue; |
| 1015 | comp = &state->newkeys[mode]->comp; |
| 1016 | if (comp && !comp->enabled && comp->type == COMP_DELAYED2) { |
| 1017 | if ((r = ssh_packet_init_compression(ssh)) != 0) |
| 1018 | return r; |
| 1019 | if (mode == MODE_OUT) { |
| 1020 | if ((r = start_compression_out(ssh, 6)) != 0) |
| 1021 | return r; |
| 1022 | } else { |
| 1023 | if ((r = start_compression_in(ssh)) != 0) |
| 1024 | return r; |
| 1025 | } |
| 1026 | comp->enabled = 1; |
| 1027 | } |
| 1028 | } |
| 1029 | return 0; |
| 1030 | } |
| 1031 | |
| 1032 | /* Used to mute debug logging for noisy packet types */ |
| 1033 | int |
| 1034 | ssh_packet_log_type(u_char type) |
| 1035 | { |
| 1036 | switch (type) { |
| 1037 | case SSH2_MSG_CHANNEL_DATA94: |
| 1038 | case SSH2_MSG_CHANNEL_EXTENDED_DATA95: |
| 1039 | case SSH2_MSG_CHANNEL_WINDOW_ADJUST93: |
| 1040 | return 0; |
| 1041 | default: |
| 1042 | return 1; |
| 1043 | } |
| 1044 | } |
| 1045 | |
| 1046 | /* |
| 1047 | * Finalize packet in SSH2 format (compress, mac, encrypt, enqueue) |
| 1048 | */ |
| 1049 | int |
| 1050 | ssh_packet_send2_wrapped(struct ssh *ssh) |
| 1051 | { |
| 1052 | struct session_state *state = ssh->state; |
| 1053 | u_char type, *cp, macbuf[SSH_DIGEST_MAX_LENGTH64]; |
| 1054 | u_char tmp, padlen, pad = 0; |
| 1055 | u_int authlen = 0, aadlen = 0; |
| 1056 | u_int len; |
| 1057 | struct sshenc *enc = NULL((void*)0); |
| 1058 | struct sshmac *mac = NULL((void*)0); |
| 1059 | struct sshcomp *comp = NULL((void*)0); |
| 1060 | int r, block_size; |
| 1061 | |
| 1062 | if (state->newkeys[MODE_OUT] != NULL((void*)0)) { |
| 1063 | enc = &state->newkeys[MODE_OUT]->enc; |
| 1064 | mac = &state->newkeys[MODE_OUT]->mac; |
| 1065 | comp = &state->newkeys[MODE_OUT]->comp; |
| 1066 | /* disable mac for authenticated encryption */ |
| 1067 | if ((authlen = cipher_authlen(enc->cipher)) != 0) |
| 1068 | mac = NULL((void*)0); |
| 1069 | } |
| 1070 | block_size = enc ? enc->block_size : 8; |
| 1071 | aadlen = (mac && mac->enabled && mac->etm) || authlen ? 4 : 0; |
| 1072 | |
| 1073 | type = (sshbuf_ptr(state->outgoing_packet))[5]; |
| 1074 | if (ssh_packet_log_type(type)) |
| 1075 | debug3("send packet: type %u", type)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1075, 0, SYSLOG_LEVEL_DEBUG3, ((void*)0), "send packet: type %u" , type); |
| 1076 | #ifdef PACKET_DEBUG |
| 1077 | fprintf(stderr(&__sF[2]), "plain: "); |
| 1078 | sshbuf_dump(state->outgoing_packet, stderr(&__sF[2])); |
| 1079 | #endif |
| 1080 | |
| 1081 | if (comp && comp->enabled) { |
| 1082 | len = sshbuf_len(state->outgoing_packet); |
| 1083 | /* skip header, compress only payload */ |
| 1084 | if ((r = sshbuf_consume(state->outgoing_packet, 5)) != 0) |
| 1085 | goto out; |
| 1086 | sshbuf_reset(state->compression_buffer); |
| 1087 | if ((r = compress_buffer(ssh, state->outgoing_packet, |
| 1088 | state->compression_buffer)) != 0) |
| 1089 | goto out; |
| 1090 | sshbuf_reset(state->outgoing_packet); |
| 1091 | if ((r = sshbuf_put(state->outgoing_packet, |
| 1092 | "\0\0\0\0\0", 5)) != 0 || |
| 1093 | (r = sshbuf_putb(state->outgoing_packet, |
| 1094 | state->compression_buffer)) != 0) |
| 1095 | goto out; |
| 1096 | DBG(debug("compression: raw %d compressed %zd", len, |
| 1097 | sshbuf_len(state->outgoing_packet))); |
| 1098 | } |
| 1099 | |
| 1100 | /* sizeof (packet_len + pad_len + payload) */ |
| 1101 | len = sshbuf_len(state->outgoing_packet); |
| 1102 | |
| 1103 | /* |
| 1104 | * calc size of padding, alloc space, get random data, |
| 1105 | * minimum padding is 4 bytes |
| 1106 | */ |
| 1107 | len -= aadlen; /* packet length is not encrypted for EtM modes */ |
| 1108 | padlen = block_size - (len % block_size); |
| 1109 | if (padlen < 4) |
| 1110 | padlen += block_size; |
| 1111 | if (state->extra_pad) { |
| 1112 | tmp = state->extra_pad; |
| 1113 | state->extra_pad = |
| 1114 | ROUNDUP(state->extra_pad, block_size)((((state->extra_pad)+((block_size)-1))/(block_size))*(block_size )); |
| 1115 | /* check if roundup overflowed */ |
| 1116 | if (state->extra_pad < tmp) |
| 1117 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 1118 | tmp = (len + padlen) % state->extra_pad; |
| 1119 | /* Check whether pad calculation below will underflow */ |
| 1120 | if (tmp > state->extra_pad) |
| 1121 | return SSH_ERR_INVALID_ARGUMENT-10; |
| 1122 | pad = state->extra_pad - tmp; |
| 1123 | DBG(debug3_f("adding %d (len %d padlen %d extra_pad %d)", |
| 1124 | pad, len, padlen, state->extra_pad)); |
| 1125 | tmp = padlen; |
| 1126 | padlen += pad; |
| 1127 | /* Check whether padlen calculation overflowed */ |
| 1128 | if (padlen < tmp) |
| 1129 | return SSH_ERR_INVALID_ARGUMENT-10; /* overflow */ |
| 1130 | state->extra_pad = 0; |
| 1131 | } |
| 1132 | if ((r = sshbuf_reserve(state->outgoing_packet, padlen, &cp)) != 0) |
| 1133 | goto out; |
| 1134 | if (enc && !cipher_ctx_is_plaintext(state->send_context)) { |
| 1135 | /* random padding */ |
| 1136 | arc4random_buf(cp, padlen); |
| 1137 | } else { |
| 1138 | /* clear padding */ |
| 1139 | explicit_bzero(cp, padlen); |
| 1140 | } |
| 1141 | /* sizeof (packet_len + pad_len + payload + padding) */ |
| 1142 | len = sshbuf_len(state->outgoing_packet); |
| 1143 | cp = sshbuf_mutable_ptr(state->outgoing_packet); |
| 1144 | if (cp == NULL((void*)0)) { |
| 1145 | r = SSH_ERR_INTERNAL_ERROR-1; |
| 1146 | goto out; |
| 1147 | } |
| 1148 | /* packet_length includes payload, padding and padding length field */ |
| 1149 | POKE_U32(cp, len - 4)do { const u_int32_t __v = (len - 4); ((u_char *)(cp))[0] = ( __v >> 24) & 0xff; ((u_char *)(cp))[1] = (__v >> 16) & 0xff; ((u_char *)(cp))[2] = (__v >> 8) & 0xff; ((u_char *)(cp))[3] = __v & 0xff; } while (0); |
| 1150 | cp[4] = padlen; |
| 1151 | DBG(debug("send: len %d (includes padlen %d, aadlen %d)", |
| 1152 | len, padlen, aadlen)); |
| 1153 | |
| 1154 | /* compute MAC over seqnr and packet(length fields, payload, padding) */ |
| 1155 | if (mac && mac->enabled && !mac->etm) { |
| 1156 | if ((r = mac_compute(mac, state->p_send.seqnr, |
| 1157 | sshbuf_ptr(state->outgoing_packet), len, |
| 1158 | macbuf, sizeof(macbuf))) != 0) |
| 1159 | goto out; |
| 1160 | DBG(debug("done calc MAC out #%d", state->p_send.seqnr)); |
| 1161 | } |
| 1162 | /* encrypt packet and append to output buffer. */ |
| 1163 | if ((r = sshbuf_reserve(state->output, |
| 1164 | sshbuf_len(state->outgoing_packet) + authlen, &cp)) != 0) |
| 1165 | goto out; |
| 1166 | if ((r = cipher_crypt(state->send_context, state->p_send.seqnr, cp, |
| 1167 | sshbuf_ptr(state->outgoing_packet), |
| 1168 | len - aadlen, aadlen, authlen)) != 0) |
| 1169 | goto out; |
| 1170 | /* append unencrypted MAC */ |
| 1171 | if (mac && mac->enabled) { |
| 1172 | if (mac->etm) { |
| 1173 | /* EtM: compute mac over aadlen + cipher text */ |
| 1174 | if ((r = mac_compute(mac, state->p_send.seqnr, |
| 1175 | cp, len, macbuf, sizeof(macbuf))) != 0) |
| 1176 | goto out; |
| 1177 | DBG(debug("done calc MAC(EtM) out #%d", |
| 1178 | state->p_send.seqnr)); |
| 1179 | } |
| 1180 | if ((r = sshbuf_put(state->output, macbuf, mac->mac_len)) != 0) |
| 1181 | goto out; |
| 1182 | } |
| 1183 | #ifdef PACKET_DEBUG |
| 1184 | fprintf(stderr(&__sF[2]), "encrypted: "); |
| 1185 | sshbuf_dump(state->output, stderr(&__sF[2])); |
| 1186 | #endif |
| 1187 | /* increment sequence number for outgoing packets */ |
| 1188 | if (++state->p_send.seqnr == 0) |
| 1189 | logit("outgoing seqnr wraps around")sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1189, 0, SYSLOG_LEVEL_INFO, ((void*)0), "outgoing seqnr wraps around" ); |
| 1190 | if (++state->p_send.packets == 0) |
| 1191 | if (!(ssh->compat & SSH_BUG_NOREKEY0x00008000)) |
| 1192 | return SSH_ERR_NEED_REKEY-39; |
| 1193 | state->p_send.blocks += len / block_size; |
| 1194 | state->p_send.bytes += len; |
| 1195 | sshbuf_reset(state->outgoing_packet); |
| 1196 | |
| 1197 | if (type == SSH2_MSG_NEWKEYS21) |
| 1198 | r = ssh_set_newkeys(ssh, MODE_OUT); |
| 1199 | else if (type == SSH2_MSG_USERAUTH_SUCCESS52 && state->server_side) |
| 1200 | r = ssh_packet_enable_delayed_compress(ssh); |
| 1201 | else |
| 1202 | r = 0; |
| 1203 | out: |
| 1204 | return r; |
| 1205 | } |
| 1206 | |
| 1207 | /* returns non-zero if the specified packet type is usec by KEX */ |
| 1208 | static int |
| 1209 | ssh_packet_type_is_kex(u_char type) |
| 1210 | { |
| 1211 | return |
| 1212 | type >= SSH2_MSG_TRANSPORT_MIN1 && |
| 1213 | type <= SSH2_MSG_TRANSPORT_MAX49 && |
| 1214 | type != SSH2_MSG_SERVICE_REQUEST5 && |
| 1215 | type != SSH2_MSG_SERVICE_ACCEPT6 && |
| 1216 | type != SSH2_MSG_EXT_INFO7; |
| 1217 | } |
| 1218 | |
| 1219 | int |
| 1220 | ssh_packet_send2(struct ssh *ssh) |
| 1221 | { |
| 1222 | struct session_state *state = ssh->state; |
| 1223 | struct packet *p; |
| 1224 | u_char type; |
| 1225 | int r, need_rekey; |
| 1226 | |
| 1227 | if (sshbuf_len(state->outgoing_packet) < 6) |
| 1228 | return SSH_ERR_INTERNAL_ERROR-1; |
| 1229 | type = sshbuf_ptr(state->outgoing_packet)[5]; |
| 1230 | need_rekey = !ssh_packet_type_is_kex(type) && |
| 1231 | ssh_packet_need_rekeying(ssh, sshbuf_len(state->outgoing_packet)); |
| 1232 | |
| 1233 | /* |
| 1234 | * During rekeying we can only send key exchange messages. |
| 1235 | * Queue everything else. |
| 1236 | */ |
| 1237 | if ((need_rekey || state->rekeying) && !ssh_packet_type_is_kex(type)) { |
| 1238 | if (need_rekey) |
| 1239 | debug3_f("rekex triggered")sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1239, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "rekex triggered" ); |
| 1240 | debug("enqueue packet: %u", type)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1240, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "enqueue packet: %u" , type); |
| 1241 | p = calloc(1, sizeof(*p)); |
| 1242 | if (p == NULL((void*)0)) |
| 1243 | return SSH_ERR_ALLOC_FAIL-2; |
| 1244 | p->type = type; |
| 1245 | p->payload = state->outgoing_packet; |
| 1246 | TAILQ_INSERT_TAIL(&state->outgoing, p, next)do { (p)->next.tqe_next = ((void*)0); (p)->next.tqe_prev = (&state->outgoing)->tqh_last; *(&state->outgoing )->tqh_last = (p); (&state->outgoing)->tqh_last = &(p)->next.tqe_next; } while (0); |
| 1247 | state->outgoing_packet = sshbuf_new(); |
| 1248 | if (state->outgoing_packet == NULL((void*)0)) |
| 1249 | return SSH_ERR_ALLOC_FAIL-2; |
| 1250 | if (need_rekey) { |
| 1251 | /* |
| 1252 | * This packet triggered a rekey, so send the |
| 1253 | * KEXINIT now. |
| 1254 | * NB. reenters this function via kex_start_rekex(). |
| 1255 | */ |
| 1256 | return kex_start_rekex(ssh); |
| 1257 | } |
| 1258 | return 0; |
| 1259 | } |
| 1260 | |
| 1261 | /* rekeying starts with sending KEXINIT */ |
| 1262 | if (type == SSH2_MSG_KEXINIT20) |
| 1263 | state->rekeying = 1; |
| 1264 | |
| 1265 | if ((r = ssh_packet_send2_wrapped(ssh)) != 0) |
| 1266 | return r; |
| 1267 | |
| 1268 | /* after a NEWKEYS message we can send the complete queue */ |
| 1269 | if (type == SSH2_MSG_NEWKEYS21) { |
| 1270 | state->rekeying = 0; |
| 1271 | state->rekey_time = monotime(); |
| 1272 | while ((p = TAILQ_FIRST(&state->outgoing)((&state->outgoing)->tqh_first))) { |
| 1273 | type = p->type; |
| 1274 | /* |
| 1275 | * If this packet triggers a rekex, then skip the |
| 1276 | * remaining packets in the queue for now. |
| 1277 | * NB. re-enters this function via kex_start_rekex. |
| 1278 | */ |
| 1279 | if (ssh_packet_need_rekeying(ssh, |
| 1280 | sshbuf_len(p->payload))) { |
| 1281 | debug3_f("queued packet triggered rekex")sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1281, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "queued packet triggered rekex" ); |
| 1282 | return kex_start_rekex(ssh); |
| 1283 | } |
| 1284 | debug("dequeue packet: %u", type)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1284, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "dequeue packet: %u" , type); |
| 1285 | sshbuf_free(state->outgoing_packet); |
| 1286 | state->outgoing_packet = p->payload; |
| 1287 | TAILQ_REMOVE(&state->outgoing, p, next)do { if (((p)->next.tqe_next) != ((void*)0)) (p)->next. tqe_next->next.tqe_prev = (p)->next.tqe_prev; else (& state->outgoing)->tqh_last = (p)->next.tqe_prev; *(p )->next.tqe_prev = (p)->next.tqe_next; ; ; } while (0); |
| 1288 | memset(p, 0, sizeof(*p)); |
| 1289 | free(p); |
| 1290 | if ((r = ssh_packet_send2_wrapped(ssh)) != 0) |
| 1291 | return r; |
| 1292 | } |
| 1293 | } |
| 1294 | return 0; |
| 1295 | } |
| 1296 | |
| 1297 | /* |
| 1298 | * Waits until a packet has been received, and returns its type. Note that |
| 1299 | * no other data is processed until this returns, so this function should not |
| 1300 | * be used during the interactive session. |
| 1301 | */ |
| 1302 | |
| 1303 | int |
| 1304 | ssh_packet_read_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p) |
| 1305 | { |
| 1306 | struct session_state *state = ssh->state; |
| 1307 | int len, r, ms_remain; |
| 1308 | struct pollfd pfd; |
| 1309 | char buf[8192]; |
| 1310 | struct timeval start; |
| 1311 | struct timespec timespec, *timespecp = NULL((void*)0); |
| 1312 | |
| 1313 | DBG(debug("packet_read()")); |
| 1314 | |
| 1315 | /* |
| 1316 | * Since we are blocking, ensure that all written packets have |
| 1317 | * been sent. |
| 1318 | */ |
| 1319 | if ((r = ssh_packet_write_wait(ssh)) != 0) |
| 1320 | goto out; |
| 1321 | |
| 1322 | /* Stay in the loop until we have received a complete packet. */ |
| 1323 | for (;;) { |
| 1324 | /* Try to read a packet from the buffer. */ |
| 1325 | r = ssh_packet_read_poll_seqnr(ssh, typep, seqnr_p); |
| 1326 | if (r != 0) |
| 1327 | break; |
| 1328 | /* If we got a packet, return it. */ |
| 1329 | if (*typep != SSH_MSG_NONE0) |
| 1330 | break; |
| 1331 | /* |
| 1332 | * Otherwise, wait for some data to arrive, add it to the |
| 1333 | * buffer, and try again. |
| 1334 | */ |
| 1335 | pfd.fd = state->connection_in; |
| 1336 | pfd.events = POLLIN0x0001; |
| 1337 | |
| 1338 | if (state->packet_timeout_ms > 0) { |
| 1339 | ms_remain = state->packet_timeout_ms; |
| 1340 | timespecp = ×pec; |
| 1341 | } |
| 1342 | /* Wait for some data to arrive. */ |
| 1343 | for (;;) { |
| 1344 | if (state->packet_timeout_ms > 0) { |
| 1345 | ms_to_timespec(×pec, ms_remain); |
| 1346 | monotime_tv(&start); |
| 1347 | } |
| 1348 | if ((r = ppoll(&pfd, 1, timespecp, NULL((void*)0))) >= 0) |
| 1349 | break; |
| 1350 | if (errno(*__errno()) != EAGAIN35 && errno(*__errno()) != EINTR4) { |
| 1351 | r = SSH_ERR_SYSTEM_ERROR-24; |
| 1352 | goto out; |
| 1353 | } |
| 1354 | if (state->packet_timeout_ms <= 0) |
| 1355 | continue; |
| 1356 | ms_subtract_diff(&start, &ms_remain); |
| 1357 | if (ms_remain <= 0) { |
| 1358 | r = 0; |
| 1359 | break; |
| 1360 | } |
| 1361 | } |
| 1362 | if (r == 0) { |
| 1363 | r = SSH_ERR_CONN_TIMEOUT-53; |
| 1364 | goto out; |
| 1365 | } |
| 1366 | /* Read data from the socket. */ |
| 1367 | len = read(state->connection_in, buf, sizeof(buf)); |
| 1368 | if (len == 0) { |
| 1369 | r = SSH_ERR_CONN_CLOSED-52; |
| 1370 | goto out; |
| 1371 | } |
| 1372 | if (len == -1) { |
| 1373 | r = SSH_ERR_SYSTEM_ERROR-24; |
| 1374 | goto out; |
| 1375 | } |
| 1376 | |
| 1377 | /* Append it to the buffer. */ |
| 1378 | if ((r = ssh_packet_process_incoming(ssh, buf, len)) != 0) |
| 1379 | goto out; |
| 1380 | } |
| 1381 | out: |
| 1382 | return r; |
| 1383 | } |
| 1384 | |
| 1385 | int |
| 1386 | ssh_packet_read(struct ssh *ssh) |
| 1387 | { |
| 1388 | u_char type; |
| 1389 | int r; |
| 1390 | |
| 1391 | if ((r = ssh_packet_read_seqnr(ssh, &type, NULL((void*)0))) != 0) |
| 1392 | fatal_fr(r, "read")sshfatal("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1392, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "read"); |
| 1393 | return type; |
| 1394 | } |
| 1395 | |
| 1396 | /* |
| 1397 | * Waits until a packet has been received, verifies that its type matches |
| 1398 | * that given, and gives a fatal error and exits if there is a mismatch. |
| 1399 | */ |
| 1400 | |
| 1401 | int |
| 1402 | ssh_packet_read_expect(struct ssh *ssh, u_int expected_type) |
| 1403 | { |
| 1404 | int r; |
| 1405 | u_char type; |
| 1406 | |
| 1407 | if ((r = ssh_packet_read_seqnr(ssh, &type, NULL((void*)0))) != 0) |
| 1408 | return r; |
| 1409 | if (type != expected_type) { |
| 1410 | if ((r = sshpkt_disconnect(ssh, |
| 1411 | "Protocol error: expected packet type %d, got %d", |
| 1412 | expected_type, type)) != 0) |
| 1413 | return r; |
| 1414 | return SSH_ERR_PROTOCOL_ERROR-55; |
| 1415 | } |
| 1416 | return 0; |
| 1417 | } |
| 1418 | |
| 1419 | static int |
| 1420 | ssh_packet_read_poll2_mux(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p) |
| 1421 | { |
| 1422 | struct session_state *state = ssh->state; |
| 1423 | const u_char *cp; |
| 1424 | size_t need; |
| 1425 | int r; |
| 1426 | |
| 1427 | if (ssh->kex) |
| 1428 | return SSH_ERR_INTERNAL_ERROR-1; |
| 1429 | *typep = SSH_MSG_NONE0; |
| 1430 | cp = sshbuf_ptr(state->input); |
| 1431 | if (state->packlen == 0) { |
| 1432 | if (sshbuf_len(state->input) < 4 + 1) |
| 1433 | return 0; /* packet is incomplete */ |
| 1434 | state->packlen = PEEK_U32(cp)(((u_int32_t)(((const u_char *)(cp))[0]) << 24) | ((u_int32_t )(((const u_char *)(cp))[1]) << 16) | ((u_int32_t)(((const u_char *)(cp))[2]) << 8) | (u_int32_t)(((const u_char * )(cp))[3])); |
| 1435 | if (state->packlen < 4 + 1 || |
| 1436 | state->packlen > PACKET_MAX_SIZE(256 * 1024)) |
| 1437 | return SSH_ERR_MESSAGE_INCOMPLETE-3; |
| 1438 | } |
| 1439 | need = state->packlen + 4; |
| 1440 | if (sshbuf_len(state->input) < need) |
| 1441 | return 0; /* packet is incomplete */ |
| 1442 | sshbuf_reset(state->incoming_packet); |
| 1443 | if ((r = sshbuf_put(state->incoming_packet, cp + 4, |
| 1444 | state->packlen)) != 0 || |
| 1445 | (r = sshbuf_consume(state->input, need)) != 0 || |
| 1446 | (r = sshbuf_get_u8(state->incoming_packet, NULL((void*)0))) != 0 || |
| 1447 | (r = sshbuf_get_u8(state->incoming_packet, typep)) != 0) |
| 1448 | return r; |
| 1449 | if (ssh_packet_log_type(*typep)) |
| 1450 | debug3_f("type %u", *typep)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1450, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "type %u", *typep ); |
| 1451 | /* sshbuf_dump(state->incoming_packet, stderr); */ |
| 1452 | /* reset for next packet */ |
| 1453 | state->packlen = 0; |
| 1454 | return r; |
| 1455 | } |
| 1456 | |
| 1457 | int |
| 1458 | ssh_packet_read_poll2(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p) |
| 1459 | { |
| 1460 | struct session_state *state = ssh->state; |
| 1461 | u_int padlen, need; |
| 1462 | u_char *cp; |
| 1463 | u_int maclen, aadlen = 0, authlen = 0, block_size; |
| 1464 | struct sshenc *enc = NULL((void*)0); |
| 1465 | struct sshmac *mac = NULL((void*)0); |
| 1466 | struct sshcomp *comp = NULL((void*)0); |
| 1467 | int r; |
| 1468 | |
| 1469 | if (state->mux) |
| 1470 | return ssh_packet_read_poll2_mux(ssh, typep, seqnr_p); |
| 1471 | |
| 1472 | *typep = SSH_MSG_NONE0; |
| 1473 | |
| 1474 | if (state->packet_discard) |
| 1475 | return 0; |
| 1476 | |
| 1477 | if (state->newkeys[MODE_IN] != NULL((void*)0)) { |
| 1478 | enc = &state->newkeys[MODE_IN]->enc; |
| 1479 | mac = &state->newkeys[MODE_IN]->mac; |
| 1480 | comp = &state->newkeys[MODE_IN]->comp; |
| 1481 | /* disable mac for authenticated encryption */ |
| 1482 | if ((authlen = cipher_authlen(enc->cipher)) != 0) |
| 1483 | mac = NULL((void*)0); |
| 1484 | } |
| 1485 | maclen = mac && mac->enabled ? mac->mac_len : 0; |
| 1486 | block_size = enc ? enc->block_size : 8; |
| 1487 | aadlen = (mac && mac->enabled && mac->etm) || authlen ? 4 : 0; |
| 1488 | |
| 1489 | if (aadlen && state->packlen == 0) { |
| 1490 | if (cipher_get_length(state->receive_context, |
| 1491 | &state->packlen, state->p_read.seqnr, |
| 1492 | sshbuf_ptr(state->input), sshbuf_len(state->input)) != 0) |
| 1493 | return 0; |
| 1494 | if (state->packlen < 1 + 4 || |
| 1495 | state->packlen > PACKET_MAX_SIZE(256 * 1024)) { |
| 1496 | #ifdef PACKET_DEBUG |
| 1497 | sshbuf_dump(state->input, stderr(&__sF[2])); |
| 1498 | #endif |
| 1499 | logit("Bad packet length %u.", state->packlen)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1499, 0, SYSLOG_LEVEL_INFO, ((void*)0), "Bad packet length %u." , state->packlen); |
| 1500 | if ((r = sshpkt_disconnect(ssh, "Packet corrupt")) != 0) |
| 1501 | return r; |
| 1502 | return SSH_ERR_CONN_CORRUPT-54; |
| 1503 | } |
| 1504 | sshbuf_reset(state->incoming_packet); |
| 1505 | } else if (state->packlen == 0) { |
| 1506 | /* |
| 1507 | * check if input size is less than the cipher block size, |
| 1508 | * decrypt first block and extract length of incoming packet |
| 1509 | */ |
| 1510 | if (sshbuf_len(state->input) < block_size) |
| 1511 | return 0; |
| 1512 | sshbuf_reset(state->incoming_packet); |
| 1513 | if ((r = sshbuf_reserve(state->incoming_packet, block_size, |
| 1514 | &cp)) != 0) |
| 1515 | goto out; |
| 1516 | if ((r = cipher_crypt(state->receive_context, |
| 1517 | state->p_send.seqnr, cp, sshbuf_ptr(state->input), |
| 1518 | block_size, 0, 0)) != 0) |
| 1519 | goto out; |
| 1520 | state->packlen = PEEK_U32(sshbuf_ptr(state->incoming_packet))(((u_int32_t)(((const u_char *)(sshbuf_ptr(state->incoming_packet )))[0]) << 24) | ((u_int32_t)(((const u_char *)(sshbuf_ptr (state->incoming_packet)))[1]) << 16) | ((u_int32_t) (((const u_char *)(sshbuf_ptr(state->incoming_packet)))[2] ) << 8) | (u_int32_t)(((const u_char *)(sshbuf_ptr(state ->incoming_packet)))[3])); |
| 1521 | if (state->packlen < 1 + 4 || |
| 1522 | state->packlen > PACKET_MAX_SIZE(256 * 1024)) { |
| 1523 | #ifdef PACKET_DEBUG |
| 1524 | fprintf(stderr(&__sF[2]), "input: \n"); |
| 1525 | sshbuf_dump(state->input, stderr(&__sF[2])); |
| 1526 | fprintf(stderr(&__sF[2]), "incoming_packet: \n"); |
| 1527 | sshbuf_dump(state->incoming_packet, stderr(&__sF[2])); |
| 1528 | #endif |
| 1529 | logit("Bad packet length %u.", state->packlen)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1529, 0, SYSLOG_LEVEL_INFO, ((void*)0), "Bad packet length %u." , state->packlen); |
| 1530 | return ssh_packet_start_discard(ssh, enc, mac, 0, |
| 1531 | PACKET_MAX_SIZE(256 * 1024)); |
| 1532 | } |
| 1533 | if ((r = sshbuf_consume(state->input, block_size)) != 0) |
| 1534 | goto out; |
| 1535 | } |
| 1536 | DBG(debug("input: packet len %u", state->packlen+4)); |
| 1537 | |
| 1538 | if (aadlen) { |
| 1539 | /* only the payload is encrypted */ |
| 1540 | need = state->packlen; |
| 1541 | } else { |
| 1542 | /* |
| 1543 | * the payload size and the payload are encrypted, but we |
| 1544 | * have a partial packet of block_size bytes |
| 1545 | */ |
| 1546 | need = 4 + state->packlen - block_size; |
| 1547 | } |
| 1548 | DBG(debug("partial packet: block %d, need %d, maclen %d, authlen %d," |
| 1549 | " aadlen %d", block_size, need, maclen, authlen, aadlen)); |
| 1550 | if (need % block_size != 0) { |
| 1551 | logit("padding error: need %d block %d mod %d",sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1552, 0, SYSLOG_LEVEL_INFO, ((void*)0), "padding error: need %d block %d mod %d" , need, block_size, need % block_size) |
| 1552 | need, block_size, need % block_size)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1552, 0, SYSLOG_LEVEL_INFO, ((void*)0), "padding error: need %d block %d mod %d" , need, block_size, need % block_size); |
| 1553 | return ssh_packet_start_discard(ssh, enc, mac, 0, |
| 1554 | PACKET_MAX_SIZE(256 * 1024) - block_size); |
| 1555 | } |
| 1556 | /* |
| 1557 | * check if the entire packet has been received and |
| 1558 | * decrypt into incoming_packet: |
| 1559 | * 'aadlen' bytes are unencrypted, but authenticated. |
| 1560 | * 'need' bytes are encrypted, followed by either |
| 1561 | * 'authlen' bytes of authentication tag or |
| 1562 | * 'maclen' bytes of message authentication code. |
| 1563 | */ |
| 1564 | if (sshbuf_len(state->input) < aadlen + need + authlen + maclen) |
| 1565 | return 0; /* packet is incomplete */ |
| 1566 | #ifdef PACKET_DEBUG |
| 1567 | fprintf(stderr(&__sF[2]), "read_poll enc/full: "); |
| 1568 | sshbuf_dump(state->input, stderr(&__sF[2])); |
| 1569 | #endif |
| 1570 | /* EtM: check mac over encrypted input */ |
| 1571 | if (mac && mac->enabled && mac->etm) { |
| 1572 | if ((r = mac_check(mac, state->p_read.seqnr, |
| 1573 | sshbuf_ptr(state->input), aadlen + need, |
| 1574 | sshbuf_ptr(state->input) + aadlen + need + authlen, |
| 1575 | maclen)) != 0) { |
| 1576 | if (r == SSH_ERR_MAC_INVALID-30) |
| 1577 | logit("Corrupted MAC on input.")sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1577, 0, SYSLOG_LEVEL_INFO, ((void*)0), "Corrupted MAC on input." ); |
| 1578 | goto out; |
| 1579 | } |
| 1580 | } |
| 1581 | if ((r = sshbuf_reserve(state->incoming_packet, aadlen + need, |
| 1582 | &cp)) != 0) |
| 1583 | goto out; |
| 1584 | if ((r = cipher_crypt(state->receive_context, state->p_read.seqnr, cp, |
| 1585 | sshbuf_ptr(state->input), need, aadlen, authlen)) != 0) |
| 1586 | goto out; |
| 1587 | if ((r = sshbuf_consume(state->input, aadlen + need + authlen)) != 0) |
| 1588 | goto out; |
| 1589 | if (mac && mac->enabled) { |
| 1590 | /* Not EtM: check MAC over cleartext */ |
| 1591 | if (!mac->etm && (r = mac_check(mac, state->p_read.seqnr, |
| 1592 | sshbuf_ptr(state->incoming_packet), |
| 1593 | sshbuf_len(state->incoming_packet), |
| 1594 | sshbuf_ptr(state->input), maclen)) != 0) { |
| 1595 | if (r != SSH_ERR_MAC_INVALID-30) |
| 1596 | goto out; |
| 1597 | logit("Corrupted MAC on input.")sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1597, 0, SYSLOG_LEVEL_INFO, ((void*)0), "Corrupted MAC on input." ); |
| 1598 | if (need + block_size > PACKET_MAX_SIZE(256 * 1024)) |
| 1599 | return SSH_ERR_INTERNAL_ERROR-1; |
| 1600 | return ssh_packet_start_discard(ssh, enc, mac, |
| 1601 | sshbuf_len(state->incoming_packet), |
| 1602 | PACKET_MAX_SIZE(256 * 1024) - need - block_size); |
| 1603 | } |
| 1604 | /* Remove MAC from input buffer */ |
| 1605 | DBG(debug("MAC #%d ok", state->p_read.seqnr)); |
| 1606 | if ((r = sshbuf_consume(state->input, mac->mac_len)) != 0) |
| 1607 | goto out; |
| 1608 | } |
| 1609 | if (seqnr_p != NULL((void*)0)) |
| 1610 | *seqnr_p = state->p_read.seqnr; |
| 1611 | if (++state->p_read.seqnr == 0) |
| 1612 | logit("incoming seqnr wraps around")sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1612, 0, SYSLOG_LEVEL_INFO, ((void*)0), "incoming seqnr wraps around" ); |
| 1613 | if (++state->p_read.packets == 0) |
| 1614 | if (!(ssh->compat & SSH_BUG_NOREKEY0x00008000)) |
| 1615 | return SSH_ERR_NEED_REKEY-39; |
| 1616 | state->p_read.blocks += (state->packlen + 4) / block_size; |
| 1617 | state->p_read.bytes += state->packlen + 4; |
| 1618 | |
| 1619 | /* get padlen */ |
| 1620 | padlen = sshbuf_ptr(state->incoming_packet)[4]; |
| 1621 | DBG(debug("input: padlen %d", padlen)); |
| 1622 | if (padlen < 4) { |
| 1623 | if ((r = sshpkt_disconnect(ssh, |
| 1624 | "Corrupted padlen %d on input.", padlen)) != 0 || |
| 1625 | (r = ssh_packet_write_wait(ssh)) != 0) |
| 1626 | return r; |
| 1627 | return SSH_ERR_CONN_CORRUPT-54; |
| 1628 | } |
| 1629 | |
| 1630 | /* skip packet size + padlen, discard padding */ |
| 1631 | if ((r = sshbuf_consume(state->incoming_packet, 4 + 1)) != 0 || |
| 1632 | ((r = sshbuf_consume_end(state->incoming_packet, padlen)) != 0)) |
| 1633 | goto out; |
| 1634 | |
| 1635 | DBG(debug("input: len before de-compress %zd", |
| 1636 | sshbuf_len(state->incoming_packet))); |
| 1637 | if (comp && comp->enabled) { |
| 1638 | sshbuf_reset(state->compression_buffer); |
| 1639 | if ((r = uncompress_buffer(ssh, state->incoming_packet, |
| 1640 | state->compression_buffer)) != 0) |
| 1641 | goto out; |
| 1642 | sshbuf_reset(state->incoming_packet); |
| 1643 | if ((r = sshbuf_putb(state->incoming_packet, |
| 1644 | state->compression_buffer)) != 0) |
| 1645 | goto out; |
| 1646 | DBG(debug("input: len after de-compress %zd", |
| 1647 | sshbuf_len(state->incoming_packet))); |
| 1648 | } |
| 1649 | /* |
| 1650 | * get packet type, implies consume. |
| 1651 | * return length of payload (without type field) |
| 1652 | */ |
| 1653 | if ((r = sshbuf_get_u8(state->incoming_packet, typep)) != 0) |
| 1654 | goto out; |
| 1655 | if (ssh_packet_log_type(*typep)) |
| 1656 | debug3("receive packet: type %u", *typep)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1656, 0, SYSLOG_LEVEL_DEBUG3, ((void*)0), "receive packet: type %u" , *typep); |
| 1657 | if (*typep < SSH2_MSG_MIN1 || *typep >= SSH2_MSG_LOCAL_MIN192) { |
| 1658 | if ((r = sshpkt_disconnect(ssh, |
| 1659 | "Invalid ssh2 packet type: %d", *typep)) != 0 || |
| 1660 | (r = ssh_packet_write_wait(ssh)) != 0) |
| 1661 | return r; |
| 1662 | return SSH_ERR_PROTOCOL_ERROR-55; |
| 1663 | } |
| 1664 | if (state->hook_in != NULL((void*)0) && |
| 1665 | (r = state->hook_in(ssh, state->incoming_packet, typep, |
| 1666 | state->hook_in_ctx)) != 0) |
| 1667 | return r; |
| 1668 | if (*typep == SSH2_MSG_USERAUTH_SUCCESS52 && !state->server_side) |
| 1669 | r = ssh_packet_enable_delayed_compress(ssh); |
| 1670 | else |
| 1671 | r = 0; |
Value stored to 'r' is never read | |
| 1672 | #ifdef PACKET_DEBUG |
| 1673 | fprintf(stderr(&__sF[2]), "read/plain[%d]:\r\n", *typep); |
| 1674 | sshbuf_dump(state->incoming_packet, stderr(&__sF[2])); |
| 1675 | #endif |
| 1676 | /* reset for next packet */ |
| 1677 | state->packlen = 0; |
| 1678 | |
| 1679 | if ((r = ssh_packet_check_rekey(ssh)) != 0) |
| 1680 | return r; |
| 1681 | out: |
| 1682 | return r; |
| 1683 | } |
| 1684 | |
| 1685 | int |
| 1686 | ssh_packet_read_poll_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p) |
| 1687 | { |
| 1688 | struct session_state *state = ssh->state; |
| 1689 | u_int reason, seqnr; |
| 1690 | int r; |
| 1691 | u_char *msg; |
| 1692 | |
| 1693 | for (;;) { |
| 1694 | msg = NULL((void*)0); |
| 1695 | r = ssh_packet_read_poll2(ssh, typep, seqnr_p); |
| 1696 | if (r != 0) |
| 1697 | return r; |
| 1698 | if (*typep) { |
| 1699 | state->keep_alive_timeouts = 0; |
| 1700 | DBG(debug("received packet type %d", *typep)); |
| 1701 | } |
| 1702 | switch (*typep) { |
| 1703 | case SSH2_MSG_IGNORE2: |
| 1704 | debug3("Received SSH2_MSG_IGNORE")sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1704, 0, SYSLOG_LEVEL_DEBUG3, ((void*)0), "Received SSH2_MSG_IGNORE" ); |
| 1705 | break; |
| 1706 | case SSH2_MSG_DEBUG4: |
| 1707 | if ((r = sshpkt_get_u8(ssh, NULL((void*)0))) != 0 || |
| 1708 | (r = sshpkt_get_string(ssh, &msg, NULL((void*)0))) != 0 || |
| 1709 | (r = sshpkt_get_string(ssh, NULL((void*)0), NULL((void*)0))) != 0) { |
| 1710 | free(msg); |
| 1711 | return r; |
| 1712 | } |
| 1713 | debug("Remote: %.900s", msg)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1713, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Remote: %.900s", msg); |
| 1714 | free(msg); |
| 1715 | break; |
| 1716 | case SSH2_MSG_DISCONNECT1: |
| 1717 | if ((r = sshpkt_get_u32(ssh, &reason)) != 0 || |
| 1718 | (r = sshpkt_get_string(ssh, &msg, NULL((void*)0))) != 0) |
| 1719 | return r; |
| 1720 | /* Ignore normal client exit notifications */ |
| 1721 | do_log2(ssh->state->server_side &&sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1726, 0, ssh->state->server_side && reason == 11 ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_ERROR, ((void*)0), "Received disconnect from %s port %d:" "%u: %.400s", ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), reason , msg) |
| 1722 | reason == SSH2_DISCONNECT_BY_APPLICATION ?sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1726, 0, ssh->state->server_side && reason == 11 ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_ERROR, ((void*)0), "Received disconnect from %s port %d:" "%u: %.400s", ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), reason , msg) |
| 1723 | SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_ERROR,sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1726, 0, ssh->state->server_side && reason == 11 ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_ERROR, ((void*)0), "Received disconnect from %s port %d:" "%u: %.400s", ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), reason , msg) |
| 1724 | "Received disconnect from %s port %d:"sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1726, 0, ssh->state->server_side && reason == 11 ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_ERROR, ((void*)0), "Received disconnect from %s port %d:" "%u: %.400s", ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), reason , msg) |
| 1725 | "%u: %.400s", ssh_remote_ipaddr(ssh),sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1726, 0, ssh->state->server_side && reason == 11 ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_ERROR, ((void*)0), "Received disconnect from %s port %d:" "%u: %.400s", ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), reason , msg) |
| 1726 | ssh_remote_port(ssh), reason, msg)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1726, 0, ssh->state->server_side && reason == 11 ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_ERROR, ((void*)0), "Received disconnect from %s port %d:" "%u: %.400s", ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), reason , msg); |
| 1727 | free(msg); |
| 1728 | return SSH_ERR_DISCONNECTED-29; |
| 1729 | case SSH2_MSG_UNIMPLEMENTED3: |
| 1730 | if ((r = sshpkt_get_u32(ssh, &seqnr)) != 0) |
| 1731 | return r; |
| 1732 | debug("Received SSH2_MSG_UNIMPLEMENTED for %u",sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1733, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Received SSH2_MSG_UNIMPLEMENTED for %u" , seqnr) |
| 1733 | seqnr)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1733, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Received SSH2_MSG_UNIMPLEMENTED for %u" , seqnr); |
| 1734 | break; |
| 1735 | default: |
| 1736 | return 0; |
| 1737 | } |
| 1738 | } |
| 1739 | } |
| 1740 | |
| 1741 | /* |
| 1742 | * Buffers the given amount of input characters. This is intended to be used |
| 1743 | * together with packet_read_poll. |
| 1744 | */ |
| 1745 | |
| 1746 | int |
| 1747 | ssh_packet_process_incoming(struct ssh *ssh, const char *buf, u_int len) |
| 1748 | { |
| 1749 | struct session_state *state = ssh->state; |
| 1750 | int r; |
| 1751 | |
| 1752 | if (state->packet_discard) { |
| 1753 | state->keep_alive_timeouts = 0; /* ?? */ |
| 1754 | if (len >= state->packet_discard) { |
| 1755 | if ((r = ssh_packet_stop_discard(ssh)) != 0) |
| 1756 | return r; |
| 1757 | } |
| 1758 | state->packet_discard -= len; |
| 1759 | return 0; |
| 1760 | } |
| 1761 | if ((r = sshbuf_put(ssh->state->input, buf, len)) != 0) |
| 1762 | return r; |
| 1763 | |
| 1764 | return 0; |
| 1765 | } |
| 1766 | |
| 1767 | int |
| 1768 | ssh_packet_remaining(struct ssh *ssh) |
| 1769 | { |
| 1770 | return sshbuf_len(ssh->state->incoming_packet); |
| 1771 | } |
| 1772 | |
| 1773 | /* |
| 1774 | * Sends a diagnostic message from the server to the client. This message |
| 1775 | * can be sent at any time (but not while constructing another message). The |
| 1776 | * message is printed immediately, but only if the client is being executed |
| 1777 | * in verbose mode. These messages are primarily intended to ease debugging |
| 1778 | * authentication problems. The length of the formatted message must not |
| 1779 | * exceed 1024 bytes. This will automatically call ssh_packet_write_wait. |
| 1780 | */ |
| 1781 | void |
| 1782 | ssh_packet_send_debug(struct ssh *ssh, const char *fmt,...) |
| 1783 | { |
| 1784 | char buf[1024]; |
| 1785 | va_list args; |
| 1786 | int r; |
| 1787 | |
| 1788 | if ((ssh->compat & SSH_BUG_DEBUG0x00000040)) |
| 1789 | return; |
| 1790 | |
| 1791 | va_start(args, fmt)__builtin_va_start(args, fmt); |
| 1792 | vsnprintf(buf, sizeof(buf), fmt, args); |
| 1793 | va_end(args)__builtin_va_end(args); |
| 1794 | |
| 1795 | debug3("sending debug message: %s", buf)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1795, 0, SYSLOG_LEVEL_DEBUG3, ((void*)0), "sending debug message: %s" , buf); |
| 1796 | |
| 1797 | if ((r = sshpkt_start(ssh, SSH2_MSG_DEBUG4)) != 0 || |
| 1798 | (r = sshpkt_put_u8(ssh, 0)) != 0 || /* always display */ |
| 1799 | (r = sshpkt_put_cstring(ssh, buf)) != 0 || |
| 1800 | (r = sshpkt_put_cstring(ssh, "")) != 0 || |
| 1801 | (r = sshpkt_send(ssh)) != 0 || |
| 1802 | (r = ssh_packet_write_wait(ssh)) != 0) |
| 1803 | fatal_fr(r, "send DEBUG")sshfatal("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1803, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send DEBUG"); |
| 1804 | } |
| 1805 | |
| 1806 | void |
| 1807 | sshpkt_fmt_connection_id(struct ssh *ssh, char *s, size_t l) |
| 1808 | { |
| 1809 | snprintf(s, l, "%.200s%s%s port %d", |
| 1810 | ssh->log_preamble ? ssh->log_preamble : "", |
| 1811 | ssh->log_preamble ? " " : "", |
| 1812 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh)); |
| 1813 | } |
| 1814 | |
| 1815 | /* |
| 1816 | * Pretty-print connection-terminating errors and exit. |
| 1817 | */ |
| 1818 | static void |
| 1819 | sshpkt_vfatal(struct ssh *ssh, int r, const char *fmt, va_list ap) |
| 1820 | { |
| 1821 | char *tag = NULL((void*)0), remote_id[512]; |
| 1822 | int oerrno = errno(*__errno()); |
| 1823 | |
| 1824 | sshpkt_fmt_connection_id(ssh, remote_id, sizeof(remote_id)); |
| 1825 | |
| 1826 | switch (r) { |
| 1827 | case SSH_ERR_CONN_CLOSED-52: |
| 1828 | ssh_packet_clear_keys(ssh); |
| 1829 | logdie("Connection closed by %s", remote_id)sshlogdie("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1829, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Connection closed by %s" , remote_id); |
| 1830 | case SSH_ERR_CONN_TIMEOUT-53: |
| 1831 | ssh_packet_clear_keys(ssh); |
| 1832 | logdie("Connection %s %s timed out",sshlogdie("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1833, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Connection %s %s timed out" , ssh->state->server_side ? "from" : "to", remote_id) |
| 1833 | ssh->state->server_side ? "from" : "to", remote_id)sshlogdie("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1833, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Connection %s %s timed out" , ssh->state->server_side ? "from" : "to", remote_id); |
| 1834 | case SSH_ERR_DISCONNECTED-29: |
| 1835 | ssh_packet_clear_keys(ssh); |
| 1836 | logdie("Disconnected from %s", remote_id)sshlogdie("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1836, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Disconnected from %s" , remote_id); |
| 1837 | case SSH_ERR_SYSTEM_ERROR-24: |
| 1838 | if (errno(*__errno()) == ECONNRESET54) { |
| 1839 | ssh_packet_clear_keys(ssh); |
| 1840 | logdie("Connection reset by %s", remote_id)sshlogdie("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1840, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Connection reset by %s" , remote_id); |
| 1841 | } |
| 1842 | /* FALLTHROUGH */ |
| 1843 | case SSH_ERR_NO_CIPHER_ALG_MATCH-31: |
| 1844 | case SSH_ERR_NO_MAC_ALG_MATCH-32: |
| 1845 | case SSH_ERR_NO_COMPRESS_ALG_MATCH-33: |
| 1846 | case SSH_ERR_NO_KEX_ALG_MATCH-34: |
| 1847 | case SSH_ERR_NO_HOSTKEY_ALG_MATCH-35: |
| 1848 | if (ssh && ssh->kex && ssh->kex->failed_choice) { |
| 1849 | ssh_packet_clear_keys(ssh); |
| 1850 | errno(*__errno()) = oerrno; |
| 1851 | logdie("Unable to negotiate with %s: %s. "sshlogdie("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1853, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Unable to negotiate with %s: %s. " "Their offer: %s", remote_id, ssh_err(r), ssh->kex->failed_choice ) |
| 1852 | "Their offer: %s", remote_id, ssh_err(r),sshlogdie("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1853, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Unable to negotiate with %s: %s. " "Their offer: %s", remote_id, ssh_err(r), ssh->kex->failed_choice ) |
| 1853 | ssh->kex->failed_choice)sshlogdie("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1853, 0, SYSLOG_LEVEL_ERROR, ((void*)0), "Unable to negotiate with %s: %s. " "Their offer: %s", remote_id, ssh_err(r), ssh->kex->failed_choice ); |
| 1854 | } |
| 1855 | /* FALLTHROUGH */ |
| 1856 | default: |
| 1857 | if (vasprintf(&tag, fmt, ap) == -1) { |
| 1858 | ssh_packet_clear_keys(ssh); |
| 1859 | logdie_f("could not allocate failure message")sshlogdie("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1859, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "could not allocate failure message" ); |
| 1860 | } |
| 1861 | ssh_packet_clear_keys(ssh); |
| 1862 | errno(*__errno()) = oerrno; |
| 1863 | logdie_r(r, "%s%sConnection %s %s",sshlogdie("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1865, 0, SYSLOG_LEVEL_ERROR, ssh_err(r), "%s%sConnection %s %s" , tag != ((void*)0) ? tag : "", tag != ((void*)0) ? ": " : "" , ssh->state->server_side ? "from" : "to", remote_id) |
| 1864 | tag != NULL ? tag : "", tag != NULL ? ": " : "",sshlogdie("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1865, 0, SYSLOG_LEVEL_ERROR, ssh_err(r), "%s%sConnection %s %s" , tag != ((void*)0) ? tag : "", tag != ((void*)0) ? ": " : "" , ssh->state->server_side ? "from" : "to", remote_id) |
| 1865 | ssh->state->server_side ? "from" : "to", remote_id)sshlogdie("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1865, 0, SYSLOG_LEVEL_ERROR, ssh_err(r), "%s%sConnection %s %s" , tag != ((void*)0) ? tag : "", tag != ((void*)0) ? ": " : "" , ssh->state->server_side ? "from" : "to", remote_id); |
| 1866 | } |
| 1867 | } |
| 1868 | |
| 1869 | void |
| 1870 | sshpkt_fatal(struct ssh *ssh, int r, const char *fmt, ...) |
| 1871 | { |
| 1872 | va_list ap; |
| 1873 | |
| 1874 | va_start(ap, fmt)__builtin_va_start(ap, fmt); |
| 1875 | sshpkt_vfatal(ssh, r, fmt, ap); |
| 1876 | /* NOTREACHED */ |
| 1877 | va_end(ap)__builtin_va_end(ap); |
| 1878 | logdie_f("should have exited")sshlogdie("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1878, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "should have exited" ); |
| 1879 | } |
| 1880 | |
| 1881 | /* |
| 1882 | * Logs the error plus constructs and sends a disconnect packet, closes the |
| 1883 | * connection, and exits. This function never returns. The error message |
| 1884 | * should not contain a newline. The length of the formatted message must |
| 1885 | * not exceed 1024 bytes. |
| 1886 | */ |
| 1887 | void |
| 1888 | ssh_packet_disconnect(struct ssh *ssh, const char *fmt,...) |
| 1889 | { |
| 1890 | char buf[1024], remote_id[512]; |
| 1891 | va_list args; |
| 1892 | static int disconnecting = 0; |
| 1893 | int r; |
| 1894 | |
| 1895 | if (disconnecting) /* Guard against recursive invocations. */ |
| 1896 | fatal("packet_disconnect called recursively.")sshfatal("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1896, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "packet_disconnect called recursively." ); |
| 1897 | disconnecting = 1; |
| 1898 | |
| 1899 | /* |
| 1900 | * Format the message. Note that the caller must make sure the |
| 1901 | * message is of limited size. |
| 1902 | */ |
| 1903 | sshpkt_fmt_connection_id(ssh, remote_id, sizeof(remote_id)); |
| 1904 | va_start(args, fmt)__builtin_va_start(args, fmt); |
| 1905 | vsnprintf(buf, sizeof(buf), fmt, args); |
| 1906 | va_end(args)__builtin_va_end(args); |
| 1907 | |
| 1908 | /* Display the error locally */ |
| 1909 | logit("Disconnecting %s: %.100s", remote_id, buf)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 1909, 0, SYSLOG_LEVEL_INFO, ((void*)0), "Disconnecting %s: %.100s" , remote_id, buf); |
| 1910 | |
| 1911 | /* |
| 1912 | * Send the disconnect message to the other side, and wait |
| 1913 | * for it to get sent. |
| 1914 | */ |
| 1915 | if ((r = sshpkt_disconnect(ssh, "%s", buf)) != 0) |
| 1916 | sshpkt_fatal(ssh, r, "%s", __func__); |
| 1917 | |
| 1918 | if ((r = ssh_packet_write_wait(ssh)) != 0) |
| 1919 | sshpkt_fatal(ssh, r, "%s", __func__); |
| 1920 | |
| 1921 | /* Close the connection. */ |
| 1922 | ssh_packet_close(ssh); |
| 1923 | cleanup_exit(255); |
| 1924 | } |
| 1925 | |
| 1926 | /* |
| 1927 | * Checks if there is any buffered output, and tries to write some of |
| 1928 | * the output. |
| 1929 | */ |
| 1930 | int |
| 1931 | ssh_packet_write_poll(struct ssh *ssh) |
| 1932 | { |
| 1933 | struct session_state *state = ssh->state; |
| 1934 | int len = sshbuf_len(state->output); |
| 1935 | int r; |
| 1936 | |
| 1937 | if (len > 0) { |
| 1938 | len = write(state->connection_out, |
| 1939 | sshbuf_ptr(state->output), len); |
| 1940 | if (len == -1) { |
| 1941 | if (errno(*__errno()) == EINTR4 || errno(*__errno()) == EAGAIN35) |
| 1942 | return 0; |
| 1943 | return SSH_ERR_SYSTEM_ERROR-24; |
| 1944 | } |
| 1945 | if (len == 0) |
| 1946 | return SSH_ERR_CONN_CLOSED-52; |
| 1947 | if ((r = sshbuf_consume(state->output, len)) != 0) |
| 1948 | return r; |
| 1949 | } |
| 1950 | return 0; |
| 1951 | } |
| 1952 | |
| 1953 | /* |
| 1954 | * Calls packet_write_poll repeatedly until all pending output data has been |
| 1955 | * written. |
| 1956 | */ |
| 1957 | int |
| 1958 | ssh_packet_write_wait(struct ssh *ssh) |
| 1959 | { |
| 1960 | int ret, r, ms_remain = 0; |
| 1961 | struct timeval start; |
| 1962 | struct timespec timespec, *timespecp = NULL((void*)0); |
| 1963 | struct session_state *state = ssh->state; |
| 1964 | struct pollfd pfd; |
| 1965 | |
| 1966 | if ((r = ssh_packet_write_poll(ssh)) != 0) |
| 1967 | return r; |
| 1968 | while (ssh_packet_have_data_to_write(ssh)) { |
| 1969 | pfd.fd = state->connection_out; |
| 1970 | pfd.events = POLLOUT0x0004; |
| 1971 | |
| 1972 | if (state->packet_timeout_ms > 0) { |
| 1973 | ms_remain = state->packet_timeout_ms; |
| 1974 | timespecp = ×pec; |
| 1975 | } |
| 1976 | for (;;) { |
| 1977 | if (state->packet_timeout_ms > 0) { |
| 1978 | ms_to_timespec(×pec, ms_remain); |
| 1979 | monotime_tv(&start); |
| 1980 | } |
| 1981 | if ((ret = ppoll(&pfd, 1, timespecp, NULL((void*)0))) >= 0) |
| 1982 | break; |
| 1983 | if (errno(*__errno()) != EAGAIN35 && errno(*__errno()) != EINTR4) |
| 1984 | break; |
| 1985 | if (state->packet_timeout_ms <= 0) |
| 1986 | continue; |
| 1987 | ms_subtract_diff(&start, &ms_remain); |
| 1988 | if (ms_remain <= 0) { |
| 1989 | ret = 0; |
| 1990 | break; |
| 1991 | } |
| 1992 | } |
| 1993 | if (ret == 0) |
| 1994 | return SSH_ERR_CONN_TIMEOUT-53; |
| 1995 | if ((r = ssh_packet_write_poll(ssh)) != 0) |
| 1996 | return r; |
| 1997 | } |
| 1998 | return 0; |
| 1999 | } |
| 2000 | |
| 2001 | /* Returns true if there is buffered data to write to the connection. */ |
| 2002 | |
| 2003 | int |
| 2004 | ssh_packet_have_data_to_write(struct ssh *ssh) |
| 2005 | { |
| 2006 | return sshbuf_len(ssh->state->output) != 0; |
| 2007 | } |
| 2008 | |
| 2009 | /* Returns true if there is not too much data to write to the connection. */ |
| 2010 | |
| 2011 | int |
| 2012 | ssh_packet_not_very_much_data_to_write(struct ssh *ssh) |
| 2013 | { |
| 2014 | if (ssh->state->interactive_mode) |
| 2015 | return sshbuf_len(ssh->state->output) < 16384; |
| 2016 | else |
| 2017 | return sshbuf_len(ssh->state->output) < 128 * 1024; |
| 2018 | } |
| 2019 | |
| 2020 | void |
| 2021 | ssh_packet_set_tos(struct ssh *ssh, int tos) |
| 2022 | { |
| 2023 | if (!ssh_packet_connection_is_on_socket(ssh) || tos == INT_MAX2147483647) |
| 2024 | return; |
| 2025 | set_sock_tos(ssh->state->connection_in, tos); |
| 2026 | } |
| 2027 | |
| 2028 | /* Informs that the current session is interactive. Sets IP flags for that. */ |
| 2029 | |
| 2030 | void |
| 2031 | ssh_packet_set_interactive(struct ssh *ssh, int interactive, int qos_interactive, int qos_bulk) |
| 2032 | { |
| 2033 | struct session_state *state = ssh->state; |
| 2034 | |
| 2035 | if (state->set_interactive_called) |
| 2036 | return; |
| 2037 | state->set_interactive_called = 1; |
| 2038 | |
| 2039 | /* Record that we are in interactive mode. */ |
| 2040 | state->interactive_mode = interactive; |
| 2041 | |
| 2042 | /* Only set socket options if using a socket. */ |
| 2043 | if (!ssh_packet_connection_is_on_socket(ssh)) |
| 2044 | return; |
| 2045 | set_nodelay(state->connection_in); |
| 2046 | ssh_packet_set_tos(ssh, interactive ? qos_interactive : qos_bulk); |
| 2047 | } |
| 2048 | |
| 2049 | /* Returns true if the current connection is interactive. */ |
| 2050 | |
| 2051 | int |
| 2052 | ssh_packet_is_interactive(struct ssh *ssh) |
| 2053 | { |
| 2054 | return ssh->state->interactive_mode; |
| 2055 | } |
| 2056 | |
| 2057 | int |
| 2058 | ssh_packet_set_maxsize(struct ssh *ssh, u_int s) |
| 2059 | { |
| 2060 | struct session_state *state = ssh->state; |
| 2061 | |
| 2062 | if (state->set_maxsize_called) { |
| 2063 | logit_f("called twice: old %d new %d",sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 2064, 1, SYSLOG_LEVEL_INFO, ((void*)0), "called twice: old %d new %d" , state->max_packet_size, s) |
| 2064 | state->max_packet_size, s)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 2064, 1, SYSLOG_LEVEL_INFO, ((void*)0), "called twice: old %d new %d" , state->max_packet_size, s); |
| 2065 | return -1; |
| 2066 | } |
| 2067 | if (s < 4 * 1024 || s > 1024 * 1024) { |
| 2068 | logit_f("bad size %d", s)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 2068, 1, SYSLOG_LEVEL_INFO, ((void*)0), "bad size %d", s); |
| 2069 | return -1; |
| 2070 | } |
| 2071 | state->set_maxsize_called = 1; |
| 2072 | debug_f("setting to %d", s)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 2072, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "setting to %d", s ); |
| 2073 | state->max_packet_size = s; |
| 2074 | return s; |
| 2075 | } |
| 2076 | |
| 2077 | int |
| 2078 | ssh_packet_inc_alive_timeouts(struct ssh *ssh) |
| 2079 | { |
| 2080 | return ++ssh->state->keep_alive_timeouts; |
| 2081 | } |
| 2082 | |
| 2083 | void |
| 2084 | ssh_packet_set_alive_timeouts(struct ssh *ssh, int ka) |
| 2085 | { |
| 2086 | ssh->state->keep_alive_timeouts = ka; |
| 2087 | } |
| 2088 | |
| 2089 | u_int |
| 2090 | ssh_packet_get_maxsize(struct ssh *ssh) |
| 2091 | { |
| 2092 | return ssh->state->max_packet_size; |
| 2093 | } |
| 2094 | |
| 2095 | void |
| 2096 | ssh_packet_set_rekey_limits(struct ssh *ssh, u_int64_t bytes, u_int32_t seconds) |
| 2097 | { |
| 2098 | debug3("rekey after %llu bytes, %u seconds", (unsigned long long)bytes,sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 2099, 0, SYSLOG_LEVEL_DEBUG3, ((void*)0), "rekey after %llu bytes, %u seconds" , (unsigned long long)bytes, (unsigned int)seconds) |
| 2099 | (unsigned int)seconds)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 2099, 0, SYSLOG_LEVEL_DEBUG3, ((void*)0), "rekey after %llu bytes, %u seconds" , (unsigned long long)bytes, (unsigned int)seconds); |
| 2100 | ssh->state->rekey_limit = bytes; |
| 2101 | ssh->state->rekey_interval = seconds; |
| 2102 | } |
| 2103 | |
| 2104 | time_t |
| 2105 | ssh_packet_get_rekey_timeout(struct ssh *ssh) |
| 2106 | { |
| 2107 | time_t seconds; |
| 2108 | |
| 2109 | seconds = ssh->state->rekey_time + ssh->state->rekey_interval - |
| 2110 | monotime(); |
| 2111 | return (seconds <= 0 ? 1 : seconds); |
| 2112 | } |
| 2113 | |
| 2114 | void |
| 2115 | ssh_packet_set_server(struct ssh *ssh) |
| 2116 | { |
| 2117 | ssh->state->server_side = 1; |
| 2118 | ssh->kex->server = 1; /* XXX unify? */ |
| 2119 | } |
| 2120 | |
| 2121 | void |
| 2122 | ssh_packet_set_authenticated(struct ssh *ssh) |
| 2123 | { |
| 2124 | ssh->state->after_authentication = 1; |
| 2125 | } |
| 2126 | |
| 2127 | void * |
| 2128 | ssh_packet_get_input(struct ssh *ssh) |
| 2129 | { |
| 2130 | return (void *)ssh->state->input; |
| 2131 | } |
| 2132 | |
| 2133 | void * |
| 2134 | ssh_packet_get_output(struct ssh *ssh) |
| 2135 | { |
| 2136 | return (void *)ssh->state->output; |
| 2137 | } |
| 2138 | |
| 2139 | /* Reset after_authentication and reset compression in post-auth privsep */ |
| 2140 | static int |
| 2141 | ssh_packet_set_postauth(struct ssh *ssh) |
| 2142 | { |
| 2143 | int r; |
| 2144 | |
| 2145 | debug_f("called")sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 2145, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "called"); |
| 2146 | /* This was set in net child, but is not visible in user child */ |
| 2147 | ssh->state->after_authentication = 1; |
| 2148 | ssh->state->rekeying = 0; |
| 2149 | if ((r = ssh_packet_enable_delayed_compress(ssh)) != 0) |
| 2150 | return r; |
| 2151 | return 0; |
| 2152 | } |
| 2153 | |
| 2154 | /* Packet state (de-)serialization for privsep */ |
| 2155 | |
| 2156 | /* turn kex into a blob for packet state serialization */ |
| 2157 | static int |
| 2158 | kex_to_blob(struct sshbuf *m, struct kex *kex) |
| 2159 | { |
| 2160 | int r; |
| 2161 | |
| 2162 | if ((r = sshbuf_put_u32(m, kex->we_need)) != 0 || |
| 2163 | (r = sshbuf_put_cstring(m, kex->hostkey_alg)) != 0 || |
| 2164 | (r = sshbuf_put_u32(m, kex->hostkey_type)) != 0 || |
| 2165 | (r = sshbuf_put_u32(m, kex->hostkey_nid)) != 0 || |
| 2166 | (r = sshbuf_put_u32(m, kex->kex_type)) != 0 || |
| 2167 | (r = sshbuf_put_stringb(m, kex->my)) != 0 || |
| 2168 | (r = sshbuf_put_stringb(m, kex->peer)) != 0 || |
| 2169 | (r = sshbuf_put_stringb(m, kex->client_version)) != 0 || |
| 2170 | (r = sshbuf_put_stringb(m, kex->server_version)) != 0 || |
| 2171 | (r = sshbuf_put_stringb(m, kex->session_id)) != 0 || |
| 2172 | (r = sshbuf_put_u32(m, kex->flags)) != 0) |
| 2173 | return r; |
| 2174 | return 0; |
| 2175 | } |
| 2176 | |
| 2177 | /* turn key exchange results into a blob for packet state serialization */ |
| 2178 | static int |
| 2179 | newkeys_to_blob(struct sshbuf *m, struct ssh *ssh, int mode) |
| 2180 | { |
| 2181 | struct sshbuf *b; |
| 2182 | struct sshcipher_ctx *cc; |
| 2183 | struct sshcomp *comp; |
| 2184 | struct sshenc *enc; |
| 2185 | struct sshmac *mac; |
| 2186 | struct newkeys *newkey; |
| 2187 | int r; |
| 2188 | |
| 2189 | if ((newkey = ssh->state->newkeys[mode]) == NULL((void*)0)) |
| 2190 | return SSH_ERR_INTERNAL_ERROR-1; |
| 2191 | enc = &newkey->enc; |
| 2192 | mac = &newkey->mac; |
| 2193 | comp = &newkey->comp; |
| 2194 | cc = (mode == MODE_OUT) ? ssh->state->send_context : |
| 2195 | ssh->state->receive_context; |
| 2196 | if ((r = cipher_get_keyiv(cc, enc->iv, enc->iv_len)) != 0) |
| 2197 | return r; |
| 2198 | if ((b = sshbuf_new()) == NULL((void*)0)) |
| 2199 | return SSH_ERR_ALLOC_FAIL-2; |
| 2200 | if ((r = sshbuf_put_cstring(b, enc->name)) != 0 || |
| 2201 | (r = sshbuf_put_u32(b, enc->enabled)) != 0 || |
| 2202 | (r = sshbuf_put_u32(b, enc->block_size)) != 0 || |
| 2203 | (r = sshbuf_put_string(b, enc->key, enc->key_len)) != 0 || |
| 2204 | (r = sshbuf_put_string(b, enc->iv, enc->iv_len)) != 0) |
| 2205 | goto out; |
| 2206 | if (cipher_authlen(enc->cipher) == 0) { |
| 2207 | if ((r = sshbuf_put_cstring(b, mac->name)) != 0 || |
| 2208 | (r = sshbuf_put_u32(b, mac->enabled)) != 0 || |
| 2209 | (r = sshbuf_put_string(b, mac->key, mac->key_len)) != 0) |
| 2210 | goto out; |
| 2211 | } |
| 2212 | if ((r = sshbuf_put_u32(b, comp->type)) != 0 || |
| 2213 | (r = sshbuf_put_cstring(b, comp->name)) != 0) |
| 2214 | goto out; |
| 2215 | r = sshbuf_put_stringb(m, b); |
| 2216 | out: |
| 2217 | sshbuf_free(b); |
| 2218 | return r; |
| 2219 | } |
| 2220 | |
| 2221 | /* serialize packet state into a blob */ |
| 2222 | int |
| 2223 | ssh_packet_get_state(struct ssh *ssh, struct sshbuf *m) |
| 2224 | { |
| 2225 | struct session_state *state = ssh->state; |
| 2226 | int r; |
| 2227 | |
| 2228 | if ((r = kex_to_blob(m, ssh->kex)) != 0 || |
| 2229 | (r = newkeys_to_blob(m, ssh, MODE_OUT)) != 0 || |
| 2230 | (r = newkeys_to_blob(m, ssh, MODE_IN)) != 0 || |
| 2231 | (r = sshbuf_put_u64(m, state->rekey_limit)) != 0 || |
| 2232 | (r = sshbuf_put_u32(m, state->rekey_interval)) != 0 || |
| 2233 | (r = sshbuf_put_u32(m, state->p_send.seqnr)) != 0 || |
| 2234 | (r = sshbuf_put_u64(m, state->p_send.blocks)) != 0 || |
| 2235 | (r = sshbuf_put_u32(m, state->p_send.packets)) != 0 || |
| 2236 | (r = sshbuf_put_u64(m, state->p_send.bytes)) != 0 || |
| 2237 | (r = sshbuf_put_u32(m, state->p_read.seqnr)) != 0 || |
| 2238 | (r = sshbuf_put_u64(m, state->p_read.blocks)) != 0 || |
| 2239 | (r = sshbuf_put_u32(m, state->p_read.packets)) != 0 || |
| 2240 | (r = sshbuf_put_u64(m, state->p_read.bytes)) != 0 || |
| 2241 | (r = sshbuf_put_stringb(m, state->input)) != 0 || |
| 2242 | (r = sshbuf_put_stringb(m, state->output)) != 0) |
| 2243 | return r; |
| 2244 | |
| 2245 | return 0; |
| 2246 | } |
| 2247 | |
| 2248 | /* restore key exchange results from blob for packet state de-serialization */ |
| 2249 | static int |
| 2250 | newkeys_from_blob(struct sshbuf *m, struct ssh *ssh, int mode) |
| 2251 | { |
| 2252 | struct sshbuf *b = NULL((void*)0); |
| 2253 | struct sshcomp *comp; |
| 2254 | struct sshenc *enc; |
| 2255 | struct sshmac *mac; |
| 2256 | struct newkeys *newkey = NULL((void*)0); |
| 2257 | size_t keylen, ivlen, maclen; |
| 2258 | int r; |
| 2259 | |
| 2260 | if ((newkey = calloc(1, sizeof(*newkey))) == NULL((void*)0)) { |
| 2261 | r = SSH_ERR_ALLOC_FAIL-2; |
| 2262 | goto out; |
| 2263 | } |
| 2264 | if ((r = sshbuf_froms(m, &b)) != 0) |
| 2265 | goto out; |
| 2266 | #ifdef DEBUG_PK |
| 2267 | sshbuf_dump(b, stderr(&__sF[2])); |
| 2268 | #endif |
| 2269 | enc = &newkey->enc; |
| 2270 | mac = &newkey->mac; |
| 2271 | comp = &newkey->comp; |
| 2272 | |
| 2273 | if ((r = sshbuf_get_cstring(b, &enc->name, NULL((void*)0))) != 0 || |
| 2274 | (r = sshbuf_get_u32(b, (u_int *)&enc->enabled)) != 0 || |
| 2275 | (r = sshbuf_get_u32(b, &enc->block_size)) != 0 || |
| 2276 | (r = sshbuf_get_string(b, &enc->key, &keylen)) != 0 || |
| 2277 | (r = sshbuf_get_string(b, &enc->iv, &ivlen)) != 0) |
| 2278 | goto out; |
| 2279 | if ((enc->cipher = cipher_by_name(enc->name)) == NULL((void*)0)) { |
| 2280 | r = SSH_ERR_INVALID_FORMAT-4; |
| 2281 | goto out; |
| 2282 | } |
| 2283 | if (cipher_authlen(enc->cipher) == 0) { |
| 2284 | if ((r = sshbuf_get_cstring(b, &mac->name, NULL((void*)0))) != 0) |
| 2285 | goto out; |
| 2286 | if ((r = mac_setup(mac, mac->name)) != 0) |
| 2287 | goto out; |
| 2288 | if ((r = sshbuf_get_u32(b, (u_int *)&mac->enabled)) != 0 || |
| 2289 | (r = sshbuf_get_string(b, &mac->key, &maclen)) != 0) |
| 2290 | goto out; |
| 2291 | if (maclen > mac->key_len) { |
| 2292 | r = SSH_ERR_INVALID_FORMAT-4; |
| 2293 | goto out; |
| 2294 | } |
| 2295 | mac->key_len = maclen; |
| 2296 | } |
| 2297 | if ((r = sshbuf_get_u32(b, &comp->type)) != 0 || |
| 2298 | (r = sshbuf_get_cstring(b, &comp->name, NULL((void*)0))) != 0) |
| 2299 | goto out; |
| 2300 | if (sshbuf_len(b) != 0) { |
| 2301 | r = SSH_ERR_INVALID_FORMAT-4; |
| 2302 | goto out; |
| 2303 | } |
| 2304 | enc->key_len = keylen; |
| 2305 | enc->iv_len = ivlen; |
| 2306 | ssh->kex->newkeys[mode] = newkey; |
| 2307 | newkey = NULL((void*)0); |
| 2308 | r = 0; |
| 2309 | out: |
| 2310 | free(newkey); |
| 2311 | sshbuf_free(b); |
| 2312 | return r; |
| 2313 | } |
| 2314 | |
| 2315 | /* restore kex from blob for packet state de-serialization */ |
| 2316 | static int |
| 2317 | kex_from_blob(struct sshbuf *m, struct kex **kexp) |
| 2318 | { |
| 2319 | struct kex *kex; |
| 2320 | int r; |
| 2321 | |
| 2322 | if ((kex = kex_new()) == NULL((void*)0)) |
| 2323 | return SSH_ERR_ALLOC_FAIL-2; |
| 2324 | if ((r = sshbuf_get_u32(m, &kex->we_need)) != 0 || |
| 2325 | (r = sshbuf_get_cstring(m, &kex->hostkey_alg, NULL((void*)0))) != 0 || |
| 2326 | (r = sshbuf_get_u32(m, (u_int *)&kex->hostkey_type)) != 0 || |
| 2327 | (r = sshbuf_get_u32(m, (u_int *)&kex->hostkey_nid)) != 0 || |
| 2328 | (r = sshbuf_get_u32(m, &kex->kex_type)) != 0 || |
| 2329 | (r = sshbuf_get_stringb(m, kex->my)) != 0 || |
| 2330 | (r = sshbuf_get_stringb(m, kex->peer)) != 0 || |
| 2331 | (r = sshbuf_get_stringb(m, kex->client_version)) != 0 || |
| 2332 | (r = sshbuf_get_stringb(m, kex->server_version)) != 0 || |
| 2333 | (r = sshbuf_get_stringb(m, kex->session_id)) != 0 || |
| 2334 | (r = sshbuf_get_u32(m, &kex->flags)) != 0) |
| 2335 | goto out; |
| 2336 | kex->server = 1; |
| 2337 | kex->done = 1; |
| 2338 | r = 0; |
| 2339 | out: |
| 2340 | if (r != 0 || kexp == NULL((void*)0)) { |
| 2341 | kex_free(kex); |
| 2342 | if (kexp != NULL((void*)0)) |
| 2343 | *kexp = NULL((void*)0); |
| 2344 | } else { |
| 2345 | kex_free(*kexp); |
| 2346 | *kexp = kex; |
| 2347 | } |
| 2348 | return r; |
| 2349 | } |
| 2350 | |
| 2351 | /* |
| 2352 | * Restore packet state from content of blob 'm' (de-serialization). |
| 2353 | * Note that 'm' will be partially consumed on parsing or any other errors. |
| 2354 | */ |
| 2355 | int |
| 2356 | ssh_packet_set_state(struct ssh *ssh, struct sshbuf *m) |
| 2357 | { |
| 2358 | struct session_state *state = ssh->state; |
| 2359 | const u_char *input, *output; |
| 2360 | size_t ilen, olen; |
| 2361 | int r; |
| 2362 | |
| 2363 | if ((r = kex_from_blob(m, &ssh->kex)) != 0 || |
| 2364 | (r = newkeys_from_blob(m, ssh, MODE_OUT)) != 0 || |
| 2365 | (r = newkeys_from_blob(m, ssh, MODE_IN)) != 0 || |
| 2366 | (r = sshbuf_get_u64(m, &state->rekey_limit)) != 0 || |
| 2367 | (r = sshbuf_get_u32(m, &state->rekey_interval)) != 0 || |
| 2368 | (r = sshbuf_get_u32(m, &state->p_send.seqnr)) != 0 || |
| 2369 | (r = sshbuf_get_u64(m, &state->p_send.blocks)) != 0 || |
| 2370 | (r = sshbuf_get_u32(m, &state->p_send.packets)) != 0 || |
| 2371 | (r = sshbuf_get_u64(m, &state->p_send.bytes)) != 0 || |
| 2372 | (r = sshbuf_get_u32(m, &state->p_read.seqnr)) != 0 || |
| 2373 | (r = sshbuf_get_u64(m, &state->p_read.blocks)) != 0 || |
| 2374 | (r = sshbuf_get_u32(m, &state->p_read.packets)) != 0 || |
| 2375 | (r = sshbuf_get_u64(m, &state->p_read.bytes)) != 0) |
| 2376 | return r; |
| 2377 | /* |
| 2378 | * We set the time here so that in post-auth privsep child we |
| 2379 | * count from the completion of the authentication. |
| 2380 | */ |
| 2381 | state->rekey_time = monotime(); |
| 2382 | /* XXX ssh_set_newkeys overrides p_read.packets? XXX */ |
| 2383 | if ((r = ssh_set_newkeys(ssh, MODE_IN)) != 0 || |
| 2384 | (r = ssh_set_newkeys(ssh, MODE_OUT)) != 0) |
| 2385 | return r; |
| 2386 | |
| 2387 | if ((r = ssh_packet_set_postauth(ssh)) != 0) |
| 2388 | return r; |
| 2389 | |
| 2390 | sshbuf_reset(state->input); |
| 2391 | sshbuf_reset(state->output); |
| 2392 | if ((r = sshbuf_get_string_direct(m, &input, &ilen)) != 0 || |
| 2393 | (r = sshbuf_get_string_direct(m, &output, &olen)) != 0 || |
| 2394 | (r = sshbuf_put(state->input, input, ilen)) != 0 || |
| 2395 | (r = sshbuf_put(state->output, output, olen)) != 0) |
| 2396 | return r; |
| 2397 | |
| 2398 | if (sshbuf_len(m)) |
| 2399 | return SSH_ERR_INVALID_FORMAT-4; |
| 2400 | debug3_f("done")sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 2400, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "done"); |
| 2401 | return 0; |
| 2402 | } |
| 2403 | |
| 2404 | /* NEW API */ |
| 2405 | |
| 2406 | /* put data to the outgoing packet */ |
| 2407 | |
| 2408 | int |
| 2409 | sshpkt_put(struct ssh *ssh, const void *v, size_t len) |
| 2410 | { |
| 2411 | return sshbuf_put(ssh->state->outgoing_packet, v, len); |
| 2412 | } |
| 2413 | |
| 2414 | int |
| 2415 | sshpkt_putb(struct ssh *ssh, const struct sshbuf *b) |
| 2416 | { |
| 2417 | return sshbuf_putb(ssh->state->outgoing_packet, b); |
| 2418 | } |
| 2419 | |
| 2420 | int |
| 2421 | sshpkt_put_u8(struct ssh *ssh, u_char val) |
| 2422 | { |
| 2423 | return sshbuf_put_u8(ssh->state->outgoing_packet, val); |
| 2424 | } |
| 2425 | |
| 2426 | int |
| 2427 | sshpkt_put_u32(struct ssh *ssh, u_int32_t val) |
| 2428 | { |
| 2429 | return sshbuf_put_u32(ssh->state->outgoing_packet, val); |
| 2430 | } |
| 2431 | |
| 2432 | int |
| 2433 | sshpkt_put_u64(struct ssh *ssh, u_int64_t val) |
| 2434 | { |
| 2435 | return sshbuf_put_u64(ssh->state->outgoing_packet, val); |
| 2436 | } |
| 2437 | |
| 2438 | int |
| 2439 | sshpkt_put_string(struct ssh *ssh, const void *v, size_t len) |
| 2440 | { |
| 2441 | return sshbuf_put_string(ssh->state->outgoing_packet, v, len); |
| 2442 | } |
| 2443 | |
| 2444 | int |
| 2445 | sshpkt_put_cstring(struct ssh *ssh, const void *v) |
| 2446 | { |
| 2447 | return sshbuf_put_cstring(ssh->state->outgoing_packet, v); |
| 2448 | } |
| 2449 | |
| 2450 | int |
| 2451 | sshpkt_put_stringb(struct ssh *ssh, const struct sshbuf *v) |
| 2452 | { |
| 2453 | return sshbuf_put_stringb(ssh->state->outgoing_packet, v); |
| 2454 | } |
| 2455 | |
| 2456 | #ifdef WITH_OPENSSL1 |
| 2457 | int |
| 2458 | sshpkt_put_ec(struct ssh *ssh, const EC_POINT *v, const EC_GROUP *g) |
| 2459 | { |
| 2460 | return sshbuf_put_ec(ssh->state->outgoing_packet, v, g); |
| 2461 | } |
| 2462 | |
| 2463 | |
| 2464 | int |
| 2465 | sshpkt_put_bignum2(struct ssh *ssh, const BIGNUM *v) |
| 2466 | { |
| 2467 | return sshbuf_put_bignum2(ssh->state->outgoing_packet, v); |
| 2468 | } |
| 2469 | #endif /* WITH_OPENSSL */ |
| 2470 | |
| 2471 | /* fetch data from the incoming packet */ |
| 2472 | |
| 2473 | int |
| 2474 | sshpkt_get(struct ssh *ssh, void *valp, size_t len) |
| 2475 | { |
| 2476 | return sshbuf_get(ssh->state->incoming_packet, valp, len); |
| 2477 | } |
| 2478 | |
| 2479 | int |
| 2480 | sshpkt_get_u8(struct ssh *ssh, u_char *valp) |
| 2481 | { |
| 2482 | return sshbuf_get_u8(ssh->state->incoming_packet, valp); |
| 2483 | } |
| 2484 | |
| 2485 | int |
| 2486 | sshpkt_get_u32(struct ssh *ssh, u_int32_t *valp) |
| 2487 | { |
| 2488 | return sshbuf_get_u32(ssh->state->incoming_packet, valp); |
| 2489 | } |
| 2490 | |
| 2491 | int |
| 2492 | sshpkt_get_u64(struct ssh *ssh, u_int64_t *valp) |
| 2493 | { |
| 2494 | return sshbuf_get_u64(ssh->state->incoming_packet, valp); |
| 2495 | } |
| 2496 | |
| 2497 | int |
| 2498 | sshpkt_get_string(struct ssh *ssh, u_char **valp, size_t *lenp) |
| 2499 | { |
| 2500 | return sshbuf_get_string(ssh->state->incoming_packet, valp, lenp); |
| 2501 | } |
| 2502 | |
| 2503 | int |
| 2504 | sshpkt_get_string_direct(struct ssh *ssh, const u_char **valp, size_t *lenp) |
| 2505 | { |
| 2506 | return sshbuf_get_string_direct(ssh->state->incoming_packet, valp, lenp); |
| 2507 | } |
| 2508 | |
| 2509 | int |
| 2510 | sshpkt_peek_string_direct(struct ssh *ssh, const u_char **valp, size_t *lenp) |
| 2511 | { |
| 2512 | return sshbuf_peek_string_direct(ssh->state->incoming_packet, valp, lenp); |
| 2513 | } |
| 2514 | |
| 2515 | int |
| 2516 | sshpkt_get_cstring(struct ssh *ssh, char **valp, size_t *lenp) |
| 2517 | { |
| 2518 | return sshbuf_get_cstring(ssh->state->incoming_packet, valp, lenp); |
| 2519 | } |
| 2520 | |
| 2521 | int |
| 2522 | sshpkt_getb_froms(struct ssh *ssh, struct sshbuf **valp) |
| 2523 | { |
| 2524 | return sshbuf_froms(ssh->state->incoming_packet, valp); |
| 2525 | } |
| 2526 | |
| 2527 | #ifdef WITH_OPENSSL1 |
| 2528 | int |
| 2529 | sshpkt_get_ec(struct ssh *ssh, EC_POINT *v, const EC_GROUP *g) |
| 2530 | { |
| 2531 | return sshbuf_get_ec(ssh->state->incoming_packet, v, g); |
| 2532 | } |
| 2533 | |
| 2534 | int |
| 2535 | sshpkt_get_bignum2(struct ssh *ssh, BIGNUM **valp) |
| 2536 | { |
| 2537 | return sshbuf_get_bignum2(ssh->state->incoming_packet, valp); |
| 2538 | } |
| 2539 | #endif /* WITH_OPENSSL */ |
| 2540 | |
| 2541 | int |
| 2542 | sshpkt_get_end(struct ssh *ssh) |
| 2543 | { |
| 2544 | if (sshbuf_len(ssh->state->incoming_packet) > 0) |
| 2545 | return SSH_ERR_UNEXPECTED_TRAILING_DATA-23; |
| 2546 | return 0; |
| 2547 | } |
| 2548 | |
| 2549 | const u_char * |
| 2550 | sshpkt_ptr(struct ssh *ssh, size_t *lenp) |
| 2551 | { |
| 2552 | if (lenp != NULL((void*)0)) |
| 2553 | *lenp = sshbuf_len(ssh->state->incoming_packet); |
| 2554 | return sshbuf_ptr(ssh->state->incoming_packet); |
| 2555 | } |
| 2556 | |
| 2557 | /* start a new packet */ |
| 2558 | |
| 2559 | int |
| 2560 | sshpkt_start(struct ssh *ssh, u_char type) |
| 2561 | { |
| 2562 | u_char buf[6]; /* u32 packet length, u8 pad len, u8 type */ |
| 2563 | |
| 2564 | DBG(debug("packet_start[%d]", type)); |
| 2565 | memset(buf, 0, sizeof(buf)); |
| 2566 | buf[sizeof(buf) - 1] = type; |
| 2567 | sshbuf_reset(ssh->state->outgoing_packet); |
| 2568 | return sshbuf_put(ssh->state->outgoing_packet, buf, sizeof(buf)); |
| 2569 | } |
| 2570 | |
| 2571 | static int |
| 2572 | ssh_packet_send_mux(struct ssh *ssh) |
| 2573 | { |
| 2574 | struct session_state *state = ssh->state; |
| 2575 | u_char type, *cp; |
| 2576 | size_t len; |
| 2577 | int r; |
| 2578 | |
| 2579 | if (ssh->kex) |
| 2580 | return SSH_ERR_INTERNAL_ERROR-1; |
| 2581 | len = sshbuf_len(state->outgoing_packet); |
| 2582 | if (len < 6) |
| 2583 | return SSH_ERR_INTERNAL_ERROR-1; |
| 2584 | cp = sshbuf_mutable_ptr(state->outgoing_packet); |
| 2585 | type = cp[5]; |
| 2586 | if (ssh_packet_log_type(type)) |
| 2587 | debug3_f("type %u", type)sshlog("/usr/src/usr.bin/ssh/ssh-keyscan/../packet.c", __func__ , 2587, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "type %u", type); |
| 2588 | /* drop everything, but the connection protocol */ |
| 2589 | if (type >= SSH2_MSG_CONNECTION_MIN80 && |
| 2590 | type <= SSH2_MSG_CONNECTION_MAX127) { |
| 2591 | POKE_U32(cp, len - 4)do { const u_int32_t __v = (len - 4); ((u_char *)(cp))[0] = ( __v >> 24) & 0xff; ((u_char *)(cp))[1] = (__v >> 16) & 0xff; ((u_char *)(cp))[2] = (__v >> 8) & 0xff; ((u_char *)(cp))[3] = __v & 0xff; } while (0); |
| 2592 | if ((r = sshbuf_putb(state->output, |
| 2593 | state->outgoing_packet)) != 0) |
| 2594 | return r; |
| 2595 | /* sshbuf_dump(state->output, stderr); */ |
| 2596 | } |
| 2597 | sshbuf_reset(state->outgoing_packet); |
| 2598 | return 0; |
| 2599 | } |
| 2600 | |
| 2601 | /* |
| 2602 | * 9.2. Ignored Data Message |
| 2603 | * |
| 2604 | * byte SSH_MSG_IGNORE |
| 2605 | * string data |
| 2606 | * |
| 2607 | * All implementations MUST understand (and ignore) this message at any |
| 2608 | * time (after receiving the protocol version). No implementation is |
| 2609 | * required to send them. This message can be used as an additional |
| 2610 | * protection measure against advanced traffic analysis techniques. |
| 2611 | */ |
| 2612 | int |
| 2613 | sshpkt_msg_ignore(struct ssh *ssh, u_int nbytes) |
| 2614 | { |
| 2615 | u_int32_t rnd = 0; |
| 2616 | int r; |
| 2617 | u_int i; |
| 2618 | |
| 2619 | if ((r = sshpkt_start(ssh, SSH2_MSG_IGNORE2)) != 0 || |
| 2620 | (r = sshpkt_put_u32(ssh, nbytes)) != 0) |
| 2621 | return r; |
| 2622 | for (i = 0; i < nbytes; i++) { |
| 2623 | if (i % 4 == 0) |
| 2624 | rnd = arc4random(); |
| 2625 | if ((r = sshpkt_put_u8(ssh, (u_char)rnd & 0xff)) != 0) |
| 2626 | return r; |
| 2627 | rnd >>= 8; |
| 2628 | } |
| 2629 | return 0; |
| 2630 | } |
| 2631 | |
| 2632 | /* send it */ |
| 2633 | |
| 2634 | int |
| 2635 | sshpkt_send(struct ssh *ssh) |
| 2636 | { |
| 2637 | if (ssh->state && ssh->state->mux) |
| 2638 | return ssh_packet_send_mux(ssh); |
| 2639 | return ssh_packet_send2(ssh); |
| 2640 | } |
| 2641 | |
| 2642 | int |
| 2643 | sshpkt_disconnect(struct ssh *ssh, const char *fmt,...) |
| 2644 | { |
| 2645 | char buf[1024]; |
| 2646 | va_list args; |
| 2647 | int r; |
| 2648 | |
| 2649 | va_start(args, fmt)__builtin_va_start(args, fmt); |
| 2650 | vsnprintf(buf, sizeof(buf), fmt, args); |
| 2651 | va_end(args)__builtin_va_end(args); |
| 2652 | |
| 2653 | if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT1)) != 0 || |
| 2654 | (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_PROTOCOL_ERROR2)) != 0 || |
| 2655 | (r = sshpkt_put_cstring(ssh, buf)) != 0 || |
| 2656 | (r = sshpkt_put_cstring(ssh, "")) != 0 || |
| 2657 | (r = sshpkt_send(ssh)) != 0) |
| 2658 | return r; |
| 2659 | return 0; |
| 2660 | } |
| 2661 | |
| 2662 | /* roundup current message to pad bytes */ |
| 2663 | int |
| 2664 | sshpkt_add_padding(struct ssh *ssh, u_char pad) |
| 2665 | { |
| 2666 | ssh->state->extra_pad = pad; |
| 2667 | return 0; |
| 2668 | } |