Bug Summary

File:src/usr.bin/ssh/ssh-keyscan/../packet.c
Warning:line 1671, column 3
Value stored to 'r' is never read

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name packet.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/usr.bin/ssh/ssh-keyscan/obj -resource-dir /usr/local/lib/clang/13.0.0 -I /usr/src/usr.bin/ssh/ssh-keyscan/.. -D WITH_OPENSSL -D WITH_ZLIB -D ENABLE_PKCS11 -D HAVE_DLOPEN -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -fdebug-compilation-dir=/usr/src/usr.bin/ssh/ssh-keyscan/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c /usr/src/usr.bin/ssh/ssh-keyscan/../packet.c
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
88struct packet_state {
89 u_int32_t seqnr;
90 u_int32_t packets;
91 u_int64_t blocks;
92 u_int64_t bytes;
93};
94
95struct 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
101struct 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
209struct ssh *
210ssh_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
254void
255ssh_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 */
262int
263ssh_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 */
272struct ssh *
273ssh_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
309void
310ssh_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
324void
325ssh_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
333int
334ssh_packet_get_mux(struct ssh *ssh)
335{
336 return ssh->state->mux;
337}
338
339int
340ssh_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
358int
359ssh_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
385static int
386ssh_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
413int
414ssh_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
446void
447ssh_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
455int
456ssh_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
463void
464ssh_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
475int
476ssh_packet_get_connection_in(struct ssh *ssh)
477{
478 return ssh->state->connection_in;
479}
480
481/* Returns the descriptor used for writing. */
482
483int
484ssh_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
494const char *
495ssh_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
519int
520ssh_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
531const char *
532ssh_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
540int
541ssh_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 */
548const char *
549ssh_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
561static void
562ssh_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
630void
631ssh_packet_close(struct ssh *ssh)
632{
633 ssh_packet_close_internal(ssh, 1);
634}
635
636void
637ssh_packet_clear_keys(struct ssh *ssh)
638{
639 ssh_packet_close_internal(ssh, 0);
640}
641
642/* Sets remote side protocol flags. */
643
644void
645ssh_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
652u_int
653ssh_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
663static int
664ssh_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
673static int
674start_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
693static int
694start_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 */
711static int
712compress_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
757static int
758uncompress_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
806static int
807start_compression_out(struct ssh *ssh, int level)
808{
809 return SSH_ERR_INTERNAL_ERROR-1;
810}
811
812static int
813start_compression_in(struct ssh *ssh)
814{
815 return SSH_ERR_INTERNAL_ERROR-1;
816}
817
818static int
819compress_buffer(struct ssh *ssh, struct sshbuf *in, struct sshbuf *out)
820{
821 return SSH_ERR_INTERNAL_ERROR-1;
822}
823
824static int
825uncompress_buffer(struct ssh *ssh, struct sshbuf *in, struct sshbuf *out)
826{
827 return SSH_ERR_INTERNAL_ERROR-1;
828}
829#endif /* WITH_ZLIB */
830
831void
832ssh_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
840int
841ssh_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)
938static int
939ssh_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
985int
986ssh_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 */
999static int
1000ssh_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 */
1033int
1034ssh_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 */
1049int
1050ssh_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 */
1208static int
1209ssh_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
1219int
1220ssh_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
1303int
1304ssh_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 = &timespec;
1341 }
1342 /* Wait for some data to arrive. */
1343 for (;;) {
1344 if (state->packet_timeout_ms > 0) {
1345 ms_to_timespec(&timespec, 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
1385int
1386ssh_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
1401int
1402ssh_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
1419static int
1420ssh_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
1457int
1458ssh_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
1685int
1686ssh_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
1746int
1747ssh_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
1767int
1768ssh_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 */
1781void
1782ssh_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
1806void
1807sshpkt_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 */
1818static void
1819sshpkt_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
1869void
1870sshpkt_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 */
1887void
1888ssh_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 */
1930int
1931ssh_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 */
1957int
1958ssh_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 = &timespec;
1975 }
1976 for (;;) {
1977 if (state->packet_timeout_ms > 0) {
1978 ms_to_timespec(&timespec, 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
2003int
2004ssh_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
2011int
2012ssh_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
2020void
2021ssh_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
2030void
2031ssh_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
2051int
2052ssh_packet_is_interactive(struct ssh *ssh)
2053{
2054 return ssh->state->interactive_mode;
2055}
2056
2057int
2058ssh_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
2077int
2078ssh_packet_inc_alive_timeouts(struct ssh *ssh)
2079{
2080 return ++ssh->state->keep_alive_timeouts;
2081}
2082
2083void
2084ssh_packet_set_alive_timeouts(struct ssh *ssh, int ka)
2085{
2086 ssh->state->keep_alive_timeouts = ka;
2087}
2088
2089u_int
2090ssh_packet_get_maxsize(struct ssh *ssh)
2091{
2092 return ssh->state->max_packet_size;
2093}
2094
2095void
2096ssh_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
2104time_t
2105ssh_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
2114void
2115ssh_packet_set_server(struct ssh *ssh)
2116{
2117 ssh->state->server_side = 1;
2118 ssh->kex->server = 1; /* XXX unify? */
2119}
2120
2121void
2122ssh_packet_set_authenticated(struct ssh *ssh)
2123{
2124 ssh->state->after_authentication = 1;
2125}
2126
2127void *
2128ssh_packet_get_input(struct ssh *ssh)
2129{
2130 return (void *)ssh->state->input;
2131}
2132
2133void *
2134ssh_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 */
2140static int
2141ssh_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 */
2157static int
2158kex_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 */
2178static int
2179newkeys_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 */
2222int
2223ssh_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 */
2249static int
2250newkeys_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 */
2316static int
2317kex_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 */
2355int
2356ssh_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
2408int
2409sshpkt_put(struct ssh *ssh, const void *v, size_t len)
2410{
2411 return sshbuf_put(ssh->state->outgoing_packet, v, len);
2412}
2413
2414int
2415sshpkt_putb(struct ssh *ssh, const struct sshbuf *b)
2416{
2417 return sshbuf_putb(ssh->state->outgoing_packet, b);
2418}
2419
2420int
2421sshpkt_put_u8(struct ssh *ssh, u_char val)
2422{
2423 return sshbuf_put_u8(ssh->state->outgoing_packet, val);
2424}
2425
2426int
2427sshpkt_put_u32(struct ssh *ssh, u_int32_t val)
2428{
2429 return sshbuf_put_u32(ssh->state->outgoing_packet, val);
2430}
2431
2432int
2433sshpkt_put_u64(struct ssh *ssh, u_int64_t val)
2434{
2435 return sshbuf_put_u64(ssh->state->outgoing_packet, val);
2436}
2437
2438int
2439sshpkt_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
2444int
2445sshpkt_put_cstring(struct ssh *ssh, const void *v)
2446{
2447 return sshbuf_put_cstring(ssh->state->outgoing_packet, v);
2448}
2449
2450int
2451sshpkt_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
2457int
2458sshpkt_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
2464int
2465sshpkt_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
2473int
2474sshpkt_get(struct ssh *ssh, void *valp, size_t len)
2475{
2476 return sshbuf_get(ssh->state->incoming_packet, valp, len);
2477}
2478
2479int
2480sshpkt_get_u8(struct ssh *ssh, u_char *valp)
2481{
2482 return sshbuf_get_u8(ssh->state->incoming_packet, valp);
2483}
2484
2485int
2486sshpkt_get_u32(struct ssh *ssh, u_int32_t *valp)
2487{
2488 return sshbuf_get_u32(ssh->state->incoming_packet, valp);
2489}
2490
2491int
2492sshpkt_get_u64(struct ssh *ssh, u_int64_t *valp)
2493{
2494 return sshbuf_get_u64(ssh->state->incoming_packet, valp);
2495}
2496
2497int
2498sshpkt_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
2503int
2504sshpkt_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
2509int
2510sshpkt_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
2515int
2516sshpkt_get_cstring(struct ssh *ssh, char **valp, size_t *lenp)
2517{
2518 return sshbuf_get_cstring(ssh->state->incoming_packet, valp, lenp);
2519}
2520
2521int
2522sshpkt_getb_froms(struct ssh *ssh, struct sshbuf **valp)
2523{
2524 return sshbuf_froms(ssh->state->incoming_packet, valp);
2525}
2526
2527#ifdef WITH_OPENSSL1
2528int
2529sshpkt_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
2534int
2535sshpkt_get_bignum2(struct ssh *ssh, BIGNUM **valp)
2536{
2537 return sshbuf_get_bignum2(ssh->state->incoming_packet, valp);
2538}
2539#endif /* WITH_OPENSSL */
2540
2541int
2542sshpkt_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
2549const u_char *
2550sshpkt_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
2559int
2560sshpkt_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
2571static int
2572ssh_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 */
2612int
2613sshpkt_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
2634int
2635sshpkt_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
2642int
2643sshpkt_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 */
2663int
2664sshpkt_add_padding(struct ssh *ssh, u_char pad)
2665{
2666 ssh->state->extra_pad = pad;
2667 return 0;
2668}