/usr/src/usr.bin/ssh/ssh/../packet.c

Bug Summary

File:	src/usr.bin/ssh/ssh/../packet.c
Warning:	line 1285, column 11 Use of memory after it is freed
Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.4 -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name packet.c -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 -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -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/obj -resource-dir /usr/local/llvm16/lib/clang/16 -I /usr/src/usr.bin/ssh/ssh/.. -D WITH_OPENSSL -D WITH_ZLIB -D WITH_DSA -D ENABLE_PKCS11 -D HAVE_DLOPEN -internal-isystem /usr/local/llvm16/lib/clang/16/include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -fdebug-compilation-dir=/usr/src/usr.bin/ssh/ssh/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fcf-protection=branch -fno-jump-tables -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/scan/2024-01-11-140451-98009-1 -x c /usr/src/usr.bin/ssh/ssh/../packet.c
1/* $OpenBSD: packet.c,v 1.313 2023/12/18 14:45:17 djm 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/../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/../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/../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_MAX0x7fffffff / 1000) / count < timeout)
319		state->packet_timeout_ms = INT_MAX0x7fffffff;
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/../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/../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/../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/../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/../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/../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/../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/../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/../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/../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/../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/../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/../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/../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/../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), "1.3.0.1-motley", (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), "1.3.0.1-motley"
, (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_SYNC_FLUSH2);
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/../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/../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/../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/../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/../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/../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/../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/../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/../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/../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/../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_PING192:
1038	case SSH2_MSG_PONG193:
1039	case SSH2_MSG_CHANNEL_DATA94:
1040	case SSH2_MSG_CHANNEL_EXTENDED_DATA95:
1041	case SSH2_MSG_CHANNEL_WINDOW_ADJUST93:
1042		return 0;
1043	default:
1044		return 1;
1045	}
1046}
1047 
1048/*
1049 * Finalize packet in SSH2 format (compress, mac, encrypt, enqueue)
1050 */
1051int
1052ssh_packet_send2_wrapped(struct ssh *ssh)
1053{
1054	struct session_state *state = ssh->state;
1055	u_char type, *cp, macbuf[SSH_DIGEST_MAX_LENGTH64];
1056	u_char tmp, padlen, pad = 0;
1057	u_int authlen = 0, aadlen = 0;
1058	u_int len;
1059	struct sshenc *enc   = NULL((void *)0);
1060	struct sshmac *mac   = NULL((void *)0);
1061	struct sshcomp *comp = NULL((void *)0);
1062	int r, block_size;
1063 
1064	if (state->newkeys[MODE_OUT] != NULL((void *)0)) {
1065		enc  = &state->newkeys[MODE_OUT]->enc;
1066		mac  = &state->newkeys[MODE_OUT]->mac;
1067		comp = &state->newkeys[MODE_OUT]->comp;
1068		/* disable mac for authenticated encryption */
1069		if ((authlen = cipher_authlen(enc->cipher)) != 0)
1070			mac = NULL((void *)0);
1071	}
1072	block_size = enc ? enc->block_size : 8;
1073	aadlen = (mac && mac->enabled && mac->etm) || authlen ? 4 : 0;
1074 
1075	type = (sshbuf_ptr(state->outgoing_packet))[5];
1076	if (ssh_packet_log_type(type))
1077		debug3("send packet: type %u", type)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1077
, 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "send packet: type %u"
, type);
1078#ifdef PACKET_DEBUG
1079	fprintf(stderr(&__sF[2]), "plain:     ");
1080	sshbuf_dump(state->outgoing_packet, stderr(&__sF[2]));
1081#endif
1082 
1083	if (comp && comp->enabled) {
1084		len = sshbuf_len(state->outgoing_packet);
1085		/* skip header, compress only payload */
1086		if ((r = sshbuf_consume(state->outgoing_packet, 5)) != 0)
1087			goto out;
1088		sshbuf_reset(state->compression_buffer);
1089		if ((r = compress_buffer(ssh, state->outgoing_packet,
1090		    state->compression_buffer)) != 0)
1091			goto out;
1092		sshbuf_reset(state->outgoing_packet);
1093		if ((r = sshbuf_put(state->outgoing_packet,
1094		    "\0\0\0\0\0", 5)) != 0 ||
1095		    (r = sshbuf_putb(state->outgoing_packet,
1096		    state->compression_buffer)) != 0)
1097			goto out;
1098		DBG(debug("compression: raw %d compressed %zd", len,
1099		    sshbuf_len(state->outgoing_packet)));
1100	}
1101 
1102	/* sizeof (packet_len + pad_len + payload) */
1103	len = sshbuf_len(state->outgoing_packet);
1104 
1105	/*
1106	 * calc size of padding, alloc space, get random data,
1107	 * minimum padding is 4 bytes
1108	 */
1109	len -= aadlen; /* packet length is not encrypted for EtM modes */
1110	padlen = block_size - (len % block_size);
1111	if (padlen < 4)
1112		padlen += block_size;
1113	if (state->extra_pad) {
1114		tmp = state->extra_pad;
1115		state->extra_pad =
1116		    ROUNDUP(state->extra_pad, block_size)((((state->extra_pad)+((block_size)-1))/(block_size))*(block_size
));
1117		/* check if roundup overflowed */
1118		if (state->extra_pad < tmp)
1119			return SSH_ERR_INVALID_ARGUMENT-10;
1120		tmp = (len + padlen) % state->extra_pad;
1121		/* Check whether pad calculation below will underflow */
1122		if (tmp > state->extra_pad)
1123			return SSH_ERR_INVALID_ARGUMENT-10;
1124		pad = state->extra_pad - tmp;
1125		DBG(debug3_f("adding %d (len %d padlen %d extra_pad %d)",
1126		    pad, len, padlen, state->extra_pad));
1127		tmp = padlen;
1128		padlen += pad;
1129		/* Check whether padlen calculation overflowed */
1130		if (padlen < tmp)
1131			return SSH_ERR_INVALID_ARGUMENT-10; /* overflow */
1132		state->extra_pad = 0;
1133	}
1134	if ((r = sshbuf_reserve(state->outgoing_packet, padlen, &cp)) != 0)
1135		goto out;
1136	if (enc && !cipher_ctx_is_plaintext(state->send_context)) {
1137		/* random padding */
1138		arc4random_buf(cp, padlen);
1139	} else {
1140		/* clear padding */
1141		explicit_bzero(cp, padlen);
1142	}
1143	/* sizeof (packet_len + pad_len + payload + padding) */
1144	len = sshbuf_len(state->outgoing_packet);
1145	cp = sshbuf_mutable_ptr(state->outgoing_packet);
1146	if (cp == NULL((void *)0)) {
1147		r = SSH_ERR_INTERNAL_ERROR-1;
1148		goto out;
1149	}
1150	/* packet_length includes payload, padding and padding length field */
1151	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);
1152	cp[4] = padlen;
1153	DBG(debug("send: len %d (includes padlen %d, aadlen %d)",
1154	    len, padlen, aadlen));
1155 
1156	/* compute MAC over seqnr and packet(length fields, payload, padding) */
1157	if (mac && mac->enabled && !mac->etm) {
1158		if ((r = mac_compute(mac, state->p_send.seqnr,
1159		    sshbuf_ptr(state->outgoing_packet), len,
1160		    macbuf, sizeof(macbuf))) != 0)
1161			goto out;
1162		DBG(debug("done calc MAC out #%d", state->p_send.seqnr));
1163	}
1164	/* encrypt packet and append to output buffer. */
1165	if ((r = sshbuf_reserve(state->output,
1166	    sshbuf_len(state->outgoing_packet) + authlen, &cp)) != 0)
1167		goto out;
1168	if ((r = cipher_crypt(state->send_context, state->p_send.seqnr, cp,
1169	    sshbuf_ptr(state->outgoing_packet),
1170	    len - aadlen, aadlen, authlen)) != 0)
1171		goto out;
1172	/* append unencrypted MAC */
1173	if (mac && mac->enabled) {
1174		if (mac->etm) {
1175			/* EtM: compute mac over aadlen + cipher text */
1176			if ((r = mac_compute(mac, state->p_send.seqnr,
1177			    cp, len, macbuf, sizeof(macbuf))) != 0)
1178				goto out;
1179			DBG(debug("done calc MAC(EtM) out #%d",
1180			    state->p_send.seqnr));
1181		}
1182		if ((r = sshbuf_put(state->output, macbuf, mac->mac_len)) != 0)
1183			goto out;
1184	}
1185#ifdef PACKET_DEBUG
1186	fprintf(stderr(&__sF[2]), "encrypted: ");
1187	sshbuf_dump(state->output, stderr(&__sF[2]));
1188#endif
1189	/* increment sequence number for outgoing packets */
1190	if (++state->p_send.seqnr == 0) {
1191		if ((ssh->kex->flags & KEX_INITIAL0x0002) != 0) {
1192			ssh_packet_disconnect(ssh, "outgoing sequence number "
1193			    "wrapped during initial key exchange");
1194		}
1195		logit("outgoing seqnr wraps around")sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1195
, 0, SYSLOG_LEVEL_INFO, ((void *)0), "outgoing seqnr wraps around"
);
1196	}
1197	if (++state->p_send.packets == 0)
1198		if (!(ssh->compat & SSH_BUG_NOREKEY0x00008000))
1199			return SSH_ERR_NEED_REKEY-39;
1200	state->p_send.blocks += len / block_size;
1201	state->p_send.bytes += len;
1202	sshbuf_reset(state->outgoing_packet);
1203 
1204	if (type == SSH2_MSG_NEWKEYS21 && ssh->kex->kex_strict) {
1205		debug_f("resetting send seqnr %u", state->p_send.seqnr)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1205
, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "resetting send seqnr %u"
, state->p_send.seqnr);
1206		state->p_send.seqnr = 0;
1207	}
1208 
1209	if (type == SSH2_MSG_NEWKEYS21)
1210		r = ssh_set_newkeys(ssh, MODE_OUT);
1211	else if (type == SSH2_MSG_USERAUTH_SUCCESS52 && state->server_side)
1212		r = ssh_packet_enable_delayed_compress(ssh);
1213	else
1214		r = 0;
1215 out:
1216	return r;
1217}
1218 
1219/* returns non-zero if the specified packet type is usec by KEX */
1220static int
1221ssh_packet_type_is_kex(u_char type)
1222{
1223	return
1224	    type >= SSH2_MSG_TRANSPORT_MIN1 &&
1225	    type <= SSH2_MSG_TRANSPORT_MAX49 &&
1226	    type != SSH2_MSG_SERVICE_REQUEST5 &&
1227	    type != SSH2_MSG_SERVICE_ACCEPT6 &&
1228	    type != SSH2_MSG_EXT_INFO7;
1229}
1230 
1231int
1232ssh_packet_send2(struct ssh *ssh)
1233{
1234	struct session_state *state = ssh->state;
1235	struct packet *p;
1236	u_char type;
1237	int r, need_rekey;
1238 
1239	if (sshbuf_len(state->outgoing_packet) < 6)
21
←
Assuming the condition is false→
22
←
Taking false branch→
1240		return SSH_ERR_INTERNAL_ERROR-1;
1241	type = sshbuf_ptr(state->outgoing_packet)[5];
1242	need_rekey = !ssh_packet_type_is_kex(type) &&
23
←
Assuming the condition is false→
1243	    ssh_packet_need_rekeying(ssh, sshbuf_len(state->outgoing_packet));
1244 
1245	/*
1246	 * During rekeying we can only send key exchange messages.
1247	 * Queue everything else.
1248	 */
1249	if ((need_rekey23.1
'need_rekey' is 0
 || state->rekeying) && !ssh_packet_type_is_kex(type)) {
24
←
Assuming field 'rekeying' is 0→
1250		if (need_rekey)
1251			debug3_f("rekex triggered")sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1251
, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "rekex triggered");
1252		debug("enqueue packet: %u", type)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1252
, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "enqueue packet: %u", type
);
1253		p = calloc(1, sizeof(*p));
1254		if (p == NULL((void *)0))
1255			return SSH_ERR_ALLOC_FAIL-2;
1256		p->type = type;
1257		p->payload = state->outgoing_packet;
1258		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);
1259		state->outgoing_packet = sshbuf_new();
1260		if (state->outgoing_packet == NULL((void *)0))
1261			return SSH_ERR_ALLOC_FAIL-2;
1262		if (need_rekey) {
1263			/*
1264			 * This packet triggered a rekey, so send the
1265			 * KEXINIT now.
1266			 * NB. reenters this function via kex_start_rekex().
1267			 */
1268			return kex_start_rekex(ssh);
1269		}
1270		return 0;
1271	}
1272 
1273	/* rekeying starts with sending KEXINIT */
1274	if (type == SSH2_MSG_KEXINIT20)
25
←
Assuming 'type' is not equal to SSH2_MSG_KEXINIT→
26
←
Taking false branch→
1275		state->rekeying = 1;
1276 
1277	if ((r = ssh_packet_send2_wrapped(ssh)) != 0)
27
←
Assuming the condition is false→
28
←
Taking false branch→
1278		return r;
1279 
1280	/* after a NEWKEYS message we can send the complete queue */
1281	if (type == SSH2_MSG_NEWKEYS21) {
29
←
Assuming 'type' is equal to SSH2_MSG_NEWKEYS→
30
←
Taking true branch→
1282		state->rekeying = 0;
1283		state->rekey_time = monotime();
1284		while ((p = TAILQ_FIRST(&state->outgoing)((&state->outgoing)->tqh_first))) {
31
←
Loop condition is true.  Entering loop body→
40
←
Loop condition is true.  Entering loop body→
1285			type = p->type;
41
←
Use of memory after it is freed
1286			/*
1287			 * If this packet triggers a rekex, then skip the
1288			 * remaining packets in the queue for now.
1289			 * NB. re-enters this function via kex_start_rekex.
1290			 */
1291			if (ssh_packet_need_rekeying(ssh,
32
←
Assuming the condition is false→
33
←
Taking false branch→
1292			    sshbuf_len(p->payload))) {
1293				debug3_f("queued packet triggered rekex")sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1293
, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "queued packet triggered rekex"
);
1294				return kex_start_rekex(ssh);
1295			}
1296			debug("dequeue packet: %u", type)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1296
, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "dequeue packet: %u", type
);
1297			sshbuf_free(state->outgoing_packet);
1298			state->outgoing_packet = p->payload;
1299			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);
34
←
Assuming field 'tqe_next' is equal to null→
35
←
Taking false branch→
36
←
Loop condition is false.  Exiting loop→
1300			memset(p, 0, sizeof(*p));
1301			free(p);
37
←
Memory is released→
1302			if ((r = ssh_packet_send2_wrapped(ssh)) != 0)
38
←
Assuming the condition is false→
39
←
Taking false branch→
1303				return r;
1304		}
1305	}
1306	return 0;
1307}
1308 
1309/*
1310 * Waits until a packet has been received, and returns its type.  Note that
1311 * no other data is processed until this returns, so this function should not
1312 * be used during the interactive session.
1313 */
1314 
1315int
1316ssh_packet_read_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
1317{
1318	struct session_state *state = ssh->state;
1319	int len, r, ms_remain = 0;
1320	struct pollfd pfd;
1321	char buf[8192];
1322	struct timeval start;
1323	struct timespec timespec, *timespecp = NULL((void *)0);
1324 
1325	DBG(debug("packet_read()"));
1326 
1327	/*
1328	 * Since we are blocking, ensure that all written packets have
1329	 * been sent.
1330	 */
1331	if ((r = ssh_packet_write_wait(ssh)) != 0)
2
←
Assuming the condition is false→
3
←
Taking false branch→
1332		goto out;
1333 
1334	/* Stay in the loop until we have received a complete packet. */
1335	for (;;) {
4
←
Loop condition is true.  Entering loop body→
1336		/* Try to read a packet from the buffer. */
1337		if ((r = ssh_packet_read_poll_seqnr(ssh, typep, seqnr_p)) != 0)
5
←
Calling 'ssh_packet_read_poll_seqnr'→
1338			break;
1339		/* If we got a packet, return it. */
1340		if (*typep != SSH_MSG_NONE0)
1341			break;
1342		/*
1343		 * Otherwise, wait for some data to arrive, add it to the
1344		 * buffer, and try again.
1345		 */
1346		pfd.fd = state->connection_in;
1347		pfd.events = POLLIN0x0001;
1348 
1349		if (state->packet_timeout_ms > 0) {
1350			ms_remain = state->packet_timeout_ms;
1351			timespecp = &timespec;
1352		}
1353		/* Wait for some data to arrive. */
1354		for (;;) {
1355			if (state->packet_timeout_ms > 0) {
1356				ms_to_timespec(&timespec, ms_remain);
1357				monotime_tv(&start);
1358			}
1359			if ((r = ppoll(&pfd, 1, timespecp, NULL((void *)0))) >= 0)
1360				break;
1361			if (errno(*__errno()) != EAGAIN35 && errno(*__errno()) != EINTR4) {
1362				r = SSH_ERR_SYSTEM_ERROR-24;
1363				goto out;
1364			}
1365			if (state->packet_timeout_ms <= 0)
1366				continue;
1367			ms_subtract_diff(&start, &ms_remain);
1368			if (ms_remain <= 0) {
1369				r = 0;
1370				break;
1371			}
1372		}
1373		if (r == 0) {
1374			r = SSH_ERR_CONN_TIMEOUT-53;
1375			goto out;
1376		}
1377		/* Read data from the socket. */
1378		len = read(state->connection_in, buf, sizeof(buf));
1379		if (len == 0) {
1380			r = SSH_ERR_CONN_CLOSED-52;
1381			goto out;
1382		}
1383		if (len == -1) {
1384			r = SSH_ERR_SYSTEM_ERROR-24;
1385			goto out;
1386		}
1387 
1388		/* Append it to the buffer. */
1389		if ((r = ssh_packet_process_incoming(ssh, buf, len)) != 0)
1390			goto out;
1391	}
1392 out:
1393	return r;
1394}
1395 
1396int
1397ssh_packet_read(struct ssh *ssh)
1398{
1399	u_char type;
1400	int r;
1401 
1402	if ((r = ssh_packet_read_seqnr(ssh, &type, NULL((void *)0))) != 0)
1
Calling 'ssh_packet_read_seqnr'→
1403		fatal_fr(r, "read")sshfatal("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1403
, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "read");
1404	return type;
1405}
1406 
1407static int
1408ssh_packet_read_poll2_mux(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
1409{
1410	struct session_state *state = ssh->state;
1411	const u_char *cp;
1412	size_t need;
1413	int r;
1414 
1415	if (ssh->kex)
1416		return SSH_ERR_INTERNAL_ERROR-1;
1417	*typep = SSH_MSG_NONE0;
1418	cp = sshbuf_ptr(state->input);
1419	if (state->packlen == 0) {
1420		if (sshbuf_len(state->input) < 4 + 1)
1421			return 0; /* packet is incomplete */
1422		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]));
1423		if (state->packlen < 4 + 1 ||
1424		    state->packlen > PACKET_MAX_SIZE(256 * 1024))
1425			return SSH_ERR_MESSAGE_INCOMPLETE-3;
1426	}
1427	need = state->packlen + 4;
1428	if (sshbuf_len(state->input) < need)
1429		return 0; /* packet is incomplete */
1430	sshbuf_reset(state->incoming_packet);
1431	if ((r = sshbuf_put(state->incoming_packet, cp + 4,
1432	    state->packlen)) != 0 ||
1433	    (r = sshbuf_consume(state->input, need)) != 0 ||
1434	    (r = sshbuf_get_u8(state->incoming_packet, NULL((void *)0))) != 0 ||
1435	    (r = sshbuf_get_u8(state->incoming_packet, typep)) != 0)
1436		return r;
1437	if (ssh_packet_log_type(*typep))
1438		debug3_f("type %u", *typep)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1438
, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "type %u", *typep);
1439	/* sshbuf_dump(state->incoming_packet, stderr); */
1440	/* reset for next packet */
1441	state->packlen = 0;
1442	return r;
1443}
1444 
1445int
1446ssh_packet_read_poll2(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
1447{
1448	struct session_state *state = ssh->state;
1449	u_int padlen, need;
1450	u_char *cp;
1451	u_int maclen, aadlen = 0, authlen = 0, block_size;
1452	struct sshenc *enc   = NULL((void *)0);
1453	struct sshmac *mac   = NULL((void *)0);
1454	struct sshcomp *comp = NULL((void *)0);
1455	int r;
1456 
1457	if (state->mux)
1458		return ssh_packet_read_poll2_mux(ssh, typep, seqnr_p);
1459 
1460	*typep = SSH_MSG_NONE0;
1461 
1462	if (state->packet_discard)
1463		return 0;
1464 
1465	if (state->newkeys[MODE_IN] != NULL((void *)0)) {
1466		enc  = &state->newkeys[MODE_IN]->enc;
1467		mac  = &state->newkeys[MODE_IN]->mac;
1468		comp = &state->newkeys[MODE_IN]->comp;
1469		/* disable mac for authenticated encryption */
1470		if ((authlen = cipher_authlen(enc->cipher)) != 0)
1471			mac = NULL((void *)0);
1472	}
1473	maclen = mac && mac->enabled ? mac->mac_len : 0;
1474	block_size = enc ? enc->block_size : 8;
1475	aadlen = (mac && mac->enabled && mac->etm) || authlen ? 4 : 0;
1476 
1477	if (aadlen && state->packlen == 0) {
1478		if (cipher_get_length(state->receive_context,
1479		    &state->packlen, state->p_read.seqnr,
1480		    sshbuf_ptr(state->input), sshbuf_len(state->input)) != 0)
1481			return 0;
1482		if (state->packlen < 1 + 4 ||
1483		    state->packlen > PACKET_MAX_SIZE(256 * 1024)) {
1484#ifdef PACKET_DEBUG
1485			sshbuf_dump(state->input, stderr(&__sF[2]));
1486#endif
1487			logit("Bad packet length %u.", state->packlen)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1487
, 0, SYSLOG_LEVEL_INFO, ((void *)0), "Bad packet length %u.",
 state->packlen);
1488			if ((r = sshpkt_disconnect(ssh, "Packet corrupt")) != 0)
1489				return r;
1490			return SSH_ERR_CONN_CORRUPT-54;
1491		}
1492		sshbuf_reset(state->incoming_packet);
1493	} else if (state->packlen == 0) {
1494		/*
1495		 * check if input size is less than the cipher block size,
1496		 * decrypt first block and extract length of incoming packet
1497		 */
1498		if (sshbuf_len(state->input) < block_size)
1499			return 0;
1500		sshbuf_reset(state->incoming_packet);
1501		if ((r = sshbuf_reserve(state->incoming_packet, block_size,
1502		    &cp)) != 0)
1503			goto out;
1504		if ((r = cipher_crypt(state->receive_context,
1505		    state->p_send.seqnr, cp, sshbuf_ptr(state->input),
1506		    block_size, 0, 0)) != 0)
1507			goto out;
1508		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]));
1509		if (state->packlen < 1 + 4 ||
1510		    state->packlen > PACKET_MAX_SIZE(256 * 1024)) {
1511#ifdef PACKET_DEBUG
1512			fprintf(stderr(&__sF[2]), "input: \n");
1513			sshbuf_dump(state->input, stderr(&__sF[2]));
1514			fprintf(stderr(&__sF[2]), "incoming_packet: \n");
1515			sshbuf_dump(state->incoming_packet, stderr(&__sF[2]));
1516#endif
1517			logit("Bad packet length %u.", state->packlen)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1517
, 0, SYSLOG_LEVEL_INFO, ((void *)0), "Bad packet length %u.",
 state->packlen);
1518			return ssh_packet_start_discard(ssh, enc, mac, 0,
1519			    PACKET_MAX_SIZE(256 * 1024));
1520		}
1521		if ((r = sshbuf_consume(state->input, block_size)) != 0)
1522			goto out;
1523	}
1524	DBG(debug("input: packet len %u", state->packlen+4));
1525 
1526	if (aadlen) {
1527		/* only the payload is encrypted */
1528		need = state->packlen;
1529	} else {
1530		/*
1531		 * the payload size and the payload are encrypted, but we
1532		 * have a partial packet of block_size bytes
1533		 */
1534		need = 4 + state->packlen - block_size;
1535	}
1536	DBG(debug("partial packet: block %d, need %d, maclen %d, authlen %d,"
1537	    " aadlen %d", block_size, need, maclen, authlen, aadlen));
1538	if (need % block_size != 0) {
1539		logit("padding error: need %d block %d mod %d",sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1540
, 0, SYSLOG_LEVEL_INFO, ((void *)0), "padding error: need %d block %d mod %d"
, need, block_size, need % block_size)
1540		    need, block_size, need % block_size)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1540
, 0, SYSLOG_LEVEL_INFO, ((void *)0), "padding error: need %d block %d mod %d"
, need, block_size, need % block_size);
1541		return ssh_packet_start_discard(ssh, enc, mac, 0,
1542		    PACKET_MAX_SIZE(256 * 1024) - block_size);
1543	}
1544	/*
1545	 * check if the entire packet has been received and
1546	 * decrypt into incoming_packet:
1547	 * 'aadlen' bytes are unencrypted, but authenticated.
1548	 * 'need' bytes are encrypted, followed by either
1549	 * 'authlen' bytes of authentication tag or
1550	 * 'maclen' bytes of message authentication code.
1551	 */
1552	if (sshbuf_len(state->input) < aadlen + need + authlen + maclen)
1553		return 0; /* packet is incomplete */
1554#ifdef PACKET_DEBUG
1555	fprintf(stderr(&__sF[2]), "read_poll enc/full: ");
1556	sshbuf_dump(state->input, stderr(&__sF[2]));
1557#endif
1558	/* EtM: check mac over encrypted input */
1559	if (mac && mac->enabled && mac->etm) {
1560		if ((r = mac_check(mac, state->p_read.seqnr,
1561		    sshbuf_ptr(state->input), aadlen + need,
1562		    sshbuf_ptr(state->input) + aadlen + need + authlen,
1563		    maclen)) != 0) {
1564			if (r == SSH_ERR_MAC_INVALID-30)
1565				logit("Corrupted MAC on input.")sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1565
, 0, SYSLOG_LEVEL_INFO, ((void *)0), "Corrupted MAC on input."
);
1566			goto out;
1567		}
1568	}
1569	if ((r = sshbuf_reserve(state->incoming_packet, aadlen + need,
1570	    &cp)) != 0)
1571		goto out;
1572	if ((r = cipher_crypt(state->receive_context, state->p_read.seqnr, cp,
1573	    sshbuf_ptr(state->input), need, aadlen, authlen)) != 0)
1574		goto out;
1575	if ((r = sshbuf_consume(state->input, aadlen + need + authlen)) != 0)
1576		goto out;
1577	if (mac && mac->enabled) {
1578		/* Not EtM: check MAC over cleartext */
1579		if (!mac->etm && (r = mac_check(mac, state->p_read.seqnr,
1580		    sshbuf_ptr(state->incoming_packet),
1581		    sshbuf_len(state->incoming_packet),
1582		    sshbuf_ptr(state->input), maclen)) != 0) {
1583			if (r != SSH_ERR_MAC_INVALID-30)
1584				goto out;
1585			logit("Corrupted MAC on input.")sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1585
, 0, SYSLOG_LEVEL_INFO, ((void *)0), "Corrupted MAC on input."
);
1586			if (need + block_size > PACKET_MAX_SIZE(256 * 1024))
1587				return SSH_ERR_INTERNAL_ERROR-1;
1588			return ssh_packet_start_discard(ssh, enc, mac,
1589			    sshbuf_len(state->incoming_packet),
1590			    PACKET_MAX_SIZE(256 * 1024) - need - block_size);
1591		}
1592		/* Remove MAC from input buffer */
1593		DBG(debug("MAC #%d ok", state->p_read.seqnr));
1594		if ((r = sshbuf_consume(state->input, mac->mac_len)) != 0)
1595			goto out;
1596	}
1597 
1598	if (seqnr_p != NULL((void *)0))
1599		*seqnr_p = state->p_read.seqnr;
1600	if (++state->p_read.seqnr == 0) {
1601		if ((ssh->kex->flags & KEX_INITIAL0x0002) != 0) {
1602			ssh_packet_disconnect(ssh, "incoming sequence number "
1603			    "wrapped during initial key exchange");
1604		}
1605		logit("incoming seqnr wraps around")sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1605
, 0, SYSLOG_LEVEL_INFO, ((void *)0), "incoming seqnr wraps around"
);
1606	}
1607	if (++state->p_read.packets == 0)
1608		if (!(ssh->compat & SSH_BUG_NOREKEY0x00008000))
1609			return SSH_ERR_NEED_REKEY-39;
1610	state->p_read.blocks += (state->packlen + 4) / block_size;
1611	state->p_read.bytes += state->packlen + 4;
1612 
1613	/* get padlen */
1614	padlen = sshbuf_ptr(state->incoming_packet)[4];
1615	DBG(debug("input: padlen %d", padlen));
1616	if (padlen < 4)	{
1617		if ((r = sshpkt_disconnect(ssh,
1618		    "Corrupted padlen %d on input.", padlen)) != 0 ||
1619		    (r = ssh_packet_write_wait(ssh)) != 0)
1620			return r;
1621		return SSH_ERR_CONN_CORRUPT-54;
1622	}
1623 
1624	/* skip packet size + padlen, discard padding */
1625	if ((r = sshbuf_consume(state->incoming_packet, 4 + 1)) != 0 ||
1626	    ((r = sshbuf_consume_end(state->incoming_packet, padlen)) != 0))
1627		goto out;
1628 
1629	DBG(debug("input: len before de-compress %zd",
1630	    sshbuf_len(state->incoming_packet)));
1631	if (comp && comp->enabled) {
1632		sshbuf_reset(state->compression_buffer);
1633		if ((r = uncompress_buffer(ssh, state->incoming_packet,
1634		    state->compression_buffer)) != 0)
1635			goto out;
1636		sshbuf_reset(state->incoming_packet);
1637		if ((r = sshbuf_putb(state->incoming_packet,
1638		    state->compression_buffer)) != 0)
1639			goto out;
1640		DBG(debug("input: len after de-compress %zd",
1641		    sshbuf_len(state->incoming_packet)));
1642	}
1643	/*
1644	 * get packet type, implies consume.
1645	 * return length of payload (without type field)
1646	 */
1647	if ((r = sshbuf_get_u8(state->incoming_packet, typep)) != 0)
1648		goto out;
1649	if (ssh_packet_log_type(*typep))
1650		debug3("receive packet: type %u", *typep)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1650
, 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "receive packet: type %u"
, *typep);
1651	if (*typep < SSH2_MSG_MIN1) {
1652		if ((r = sshpkt_disconnect(ssh,
1653		    "Invalid ssh2 packet type: %d", *typep)) != 0 ||
1654		    (r = ssh_packet_write_wait(ssh)) != 0)
1655			return r;
1656		return SSH_ERR_PROTOCOL_ERROR-55;
1657	}
1658	if (state->hook_in != NULL((void *)0) &&
1659	    (r = state->hook_in(ssh, state->incoming_packet, typep,
1660	    state->hook_in_ctx)) != 0)
1661		return r;
1662	if (*typep == SSH2_MSG_USERAUTH_SUCCESS52 && !state->server_side)
1663		r = ssh_packet_enable_delayed_compress(ssh);
1664	else
1665		r = 0;
1666#ifdef PACKET_DEBUG
1667	fprintf(stderr(&__sF[2]), "read/plain[%d]:\r\n", *typep);
1668	sshbuf_dump(state->incoming_packet, stderr(&__sF[2]));
1669#endif
1670	/* reset for next packet */
1671	state->packlen = 0;
1672	if (*typep == SSH2_MSG_NEWKEYS21 && ssh->kex->kex_strict) {
1673		debug_f("resetting read seqnr %u", state->p_read.seqnr)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1673
, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "resetting read seqnr %u"
, state->p_read.seqnr);
1674		state->p_read.seqnr = 0;
1675	}
1676 
1677	if ((r = ssh_packet_check_rekey(ssh)) != 0)
1678		return r;
1679 out:
1680	return r;
1681}
1682 
1683int
1684ssh_packet_read_poll_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
1685{
1686	struct session_state *state = ssh->state;
1687	u_int reason, seqnr;
1688	int r;
1689	u_char *msg;
1690	const u_char *d;
1691	size_t len;
1692 
1693	for (;;) {
6
←
Loop condition is true.  Entering loop body→
1694		msg = NULL((void *)0);
1695		r = ssh_packet_read_poll2(ssh, typep, seqnr_p);
1696		if (r != 0)
7
←
Assuming 'r' is equal to 0→
8
←
Taking false branch→
1697			return r;
1698		if (*typep == 0) {
9
←
Assuming the condition is false→
10
←
Taking false branch→
1699			/* no message ready */
1700			return 0;
1701		}
1702		state->keep_alive_timeouts = 0;
1703		DBG(debug("received packet type %d", *typep));
1704 
1705		/* Always process disconnect messages */
1706		if (*typep == SSH2_MSG_DISCONNECT1) {
11
←
Assuming the condition is false→
1707			if ((r = sshpkt_get_u32(ssh, &reason)) != 0 ||
1708			    (r = sshpkt_get_string(ssh, &msg, NULL((void *)0))) != 0)
1709				return r;
1710			/* Ignore normal client exit notifications */
1711			do_log2(ssh->state->server_side &&sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1716
, 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)
1712			    reason == SSH2_DISCONNECT_BY_APPLICATION ?sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1716
, 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)
1713			    SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_ERROR,sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1716
, 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)
1714			    "Received disconnect from %s port %d:"sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1716
, 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)
1715			    "%u: %.400s", ssh_remote_ipaddr(ssh),sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1716
, 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)
1716			    ssh_remote_port(ssh), reason, msg)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1716
, 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);
1717			free(msg);
1718			return SSH_ERR_DISCONNECTED-29;
1719		}
1720 
1721		/*
1722		 * Do not implicitly handle any messages here during initial
1723		 * KEX when in strict mode. They will be need to be allowed
1724		 * explicitly by the KEX dispatch table or they will generate
1725		 * protocol errors.
1726		 */
1727		if (ssh->kex != NULL((void *)0) &&
12
←
Assuming field 'kex' is equal to NULL→
1728		    (ssh->kex->flags & KEX_INITIAL0x0002) && ssh->kex->kex_strict)
1729			return 0;
1730		/* Implicitly handle transport-level messages */
1731		switch (*typep) {
13
←
Control jumps to 'case 192:'  at line 1751→
1732		case SSH2_MSG_IGNORE2:
1733			debug3("Received SSH2_MSG_IGNORE")sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1733
, 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "Received SSH2_MSG_IGNORE"
);
1734			break;
1735		case SSH2_MSG_DEBUG4:
1736			if ((r = sshpkt_get_u8(ssh, NULL((void *)0))) != 0 ||
1737			    (r = sshpkt_get_string(ssh, &msg, NULL((void *)0))) != 0 ||
1738			    (r = sshpkt_get_string(ssh, NULL((void *)0), NULL((void *)0))) != 0) {
1739				free(msg);
1740				return r;
1741			}
1742			debug("Remote: %.900s", msg)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1742
, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Remote: %.900s", msg);
1743			free(msg);
1744			break;
1745		case SSH2_MSG_UNIMPLEMENTED3:
1746			if ((r = sshpkt_get_u32(ssh, &seqnr)) != 0)
1747				return r;
1748			debug("Received SSH2_MSG_UNIMPLEMENTED for %u",sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1749
, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Received SSH2_MSG_UNIMPLEMENTED for %u"
, seqnr)
1749			    seqnr)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1749
, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Received SSH2_MSG_UNIMPLEMENTED for %u"
, seqnr);
1750			break;
1751		case SSH2_MSG_PING192:
1752			if ((r = sshpkt_get_string_direct(ssh, &d, &len)) != 0)
14
←
Assuming the condition is false→
1753				return r;
1754			DBG(debug("Received SSH2_MSG_PING len %zu", len));
1755			if ((r = sshpkt_start(ssh, SSH2_MSG_PONG193)) != 0 ||
15
←
Assuming the condition is false→
1756			    (r = sshpkt_put_string(ssh, d, len)) != 0 ||
16
←
Assuming the condition is false→
1757			    (r = sshpkt_send(ssh)) != 0)
17
←
Calling 'sshpkt_send'→
1758				return r;
1759			break;
1760		case SSH2_MSG_PONG193:
1761			if ((r = sshpkt_get_string_direct(ssh,
1762			    NULL((void *)0), &len)) != 0)
1763				return r;
1764			DBG(debug("Received SSH2_MSG_PONG len %zu", len));
1765			break;
1766		default:
1767			return 0;
1768		}
1769	}
1770}
1771 
1772/*
1773 * Buffers the supplied input data. This is intended to be used together
1774 * with packet_read_poll().
1775 */
1776int
1777ssh_packet_process_incoming(struct ssh *ssh, const char *buf, u_int len)
1778{
1779	struct session_state *state = ssh->state;
1780	int r;
1781 
1782	if (state->packet_discard) {
1783		state->keep_alive_timeouts = 0; /* ?? */
1784		if (len >= state->packet_discard) {
1785			if ((r = ssh_packet_stop_discard(ssh)) != 0)
1786				return r;
1787		}
1788		state->packet_discard -= len;
1789		return 0;
1790	}
1791	if ((r = sshbuf_put(state->input, buf, len)) != 0)
1792		return r;
1793 
1794	return 0;
1795}
1796 
1797/* Reads and buffers data from the specified fd */
1798int
1799ssh_packet_process_read(struct ssh *ssh, int fd)
1800{
1801	struct session_state *state = ssh->state;
1802	int r;
1803	size_t rlen;
1804 
1805	if ((r = sshbuf_read(fd, state->input, PACKET_MAX_SIZE(256 * 1024), &rlen)) != 0)
1806		return r;
1807 
1808	if (state->packet_discard) {
1809		if ((r = sshbuf_consume_end(state->input, rlen)) != 0)
1810			return r;
1811		state->keep_alive_timeouts = 0; /* ?? */
1812		if (rlen >= state->packet_discard) {
1813			if ((r = ssh_packet_stop_discard(ssh)) != 0)
1814				return r;
1815		}
1816		state->packet_discard -= rlen;
1817		return 0;
1818	}
1819	return 0;
1820}
1821 
1822int
1823ssh_packet_remaining(struct ssh *ssh)
1824{
1825	return sshbuf_len(ssh->state->incoming_packet);
1826}
1827 
1828/*
1829 * Sends a diagnostic message from the server to the client.  This message
1830 * can be sent at any time (but not while constructing another message). The
1831 * message is printed immediately, but only if the client is being executed
1832 * in verbose mode.  These messages are primarily intended to ease debugging
1833 * authentication problems.   The length of the formatted message must not
1834 * exceed 1024 bytes.  This will automatically call ssh_packet_write_wait.
1835 */
1836void
1837ssh_packet_send_debug(struct ssh *ssh, const char *fmt,...)
1838{
1839	char buf[1024];
1840	va_list args;
1841	int r;
1842 
1843	if ((ssh->compat & SSH_BUG_DEBUG0x00000040))
1844		return;
1845 
1846	va_start(args, fmt)__builtin_va_start((args), fmt);
1847	vsnprintf(buf, sizeof(buf), fmt, args);
1848	va_end(args)__builtin_va_end((args));
1849 
1850	debug3("sending debug message: %s", buf)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1850
, 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "sending debug message: %s"
, buf);
1851 
1852	if ((r = sshpkt_start(ssh, SSH2_MSG_DEBUG4)) != 0 ||
1853	    (r = sshpkt_put_u8(ssh, 0)) != 0 || /* always display */
1854	    (r = sshpkt_put_cstring(ssh, buf)) != 0 ||
1855	    (r = sshpkt_put_cstring(ssh, "")) != 0 ||
1856	    (r = sshpkt_send(ssh)) != 0 ||
1857	    (r = ssh_packet_write_wait(ssh)) != 0)
1858		fatal_fr(r, "send DEBUG")sshfatal("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1858
, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send DEBUG");
1859}
1860 
1861void
1862sshpkt_fmt_connection_id(struct ssh *ssh, char *s, size_t l)
1863{
1864	snprintf(s, l, "%.200s%s%s port %d",
1865	    ssh->log_preamble ? ssh->log_preamble : "",
1866	    ssh->log_preamble ? " " : "",
1867	    ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
1868}
1869 
1870/*
1871 * Pretty-print connection-terminating errors and exit.
1872 */
1873static void
1874sshpkt_vfatal(struct ssh *ssh, int r, const char *fmt, va_list ap)
1875{
1876	char *tag = NULL((void *)0), remote_id[512];
1877	int oerrno = errno(*__errno());
1878 
1879	sshpkt_fmt_connection_id(ssh, remote_id, sizeof(remote_id));
1880 
1881	switch (r) {
1882	case SSH_ERR_CONN_CLOSED-52:
1883		ssh_packet_clear_keys(ssh);
1884		logdie("Connection closed by %s", remote_id)sshlogdie("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1884
, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Connection closed by %s"
, remote_id);
1885	case SSH_ERR_CONN_TIMEOUT-53:
1886		ssh_packet_clear_keys(ssh);
1887		logdie("Connection %s %s timed out",sshlogdie("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1888
, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Connection %s %s timed out"
, ssh->state->server_side ? "from" : "to", remote_id)
1888		    ssh->state->server_side ? "from" : "to", remote_id)sshlogdie("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1888
, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Connection %s %s timed out"
, ssh->state->server_side ? "from" : "to", remote_id);
1889	case SSH_ERR_DISCONNECTED-29:
1890		ssh_packet_clear_keys(ssh);
1891		logdie("Disconnected from %s", remote_id)sshlogdie("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1891
, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Disconnected from %s",
 remote_id);
1892	case SSH_ERR_SYSTEM_ERROR-24:
1893		if (errno(*__errno()) == ECONNRESET54) {
1894			ssh_packet_clear_keys(ssh);
1895			logdie("Connection reset by %s", remote_id)sshlogdie("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1895
, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Connection reset by %s"
, remote_id);
1896		}
1897		/* FALLTHROUGH */
1898	case SSH_ERR_NO_CIPHER_ALG_MATCH-31:
1899	case SSH_ERR_NO_MAC_ALG_MATCH-32:
1900	case SSH_ERR_NO_COMPRESS_ALG_MATCH-33:
1901	case SSH_ERR_NO_KEX_ALG_MATCH-34:
1902	case SSH_ERR_NO_HOSTKEY_ALG_MATCH-35:
1903		if (ssh->kex && ssh->kex->failed_choice) {
1904			ssh_packet_clear_keys(ssh);
1905			errno(*__errno()) = oerrno;
1906			logdie("Unable to negotiate with %s: %s. "sshlogdie("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1908
, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Unable to negotiate with %s: %s. "
 "Their offer: %s", remote_id, ssh_err(r), ssh->kex->failed_choice
)
1907			    "Their offer: %s", remote_id, ssh_err(r),sshlogdie("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1908
, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Unable to negotiate with %s: %s. "
 "Their offer: %s", remote_id, ssh_err(r), ssh->kex->failed_choice
)
1908			    ssh->kex->failed_choice)sshlogdie("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1908
, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Unable to negotiate with %s: %s. "
 "Their offer: %s", remote_id, ssh_err(r), ssh->kex->failed_choice
);
1909		}
1910		/* FALLTHROUGH */
1911	default:
1912		if (vasprintf(&tag, fmt, ap) == -1) {
1913			ssh_packet_clear_keys(ssh);
1914			logdie_f("could not allocate failure message")sshlogdie("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1914
, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "could not allocate failure message"
);
1915		}
1916		ssh_packet_clear_keys(ssh);
1917		errno(*__errno()) = oerrno;
1918		logdie_r(r, "%s%sConnection %s %s",sshlogdie("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1920
, 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)
1919		    tag != NULL ? tag : "", tag != NULL ? ": " : "",sshlogdie("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1920
, 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)
1920		    ssh->state->server_side ? "from" : "to", remote_id)sshlogdie("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1920
, 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);
1921	}
1922}
1923 
1924void
1925sshpkt_fatal(struct ssh *ssh, int r, const char *fmt, ...)
1926{
1927	va_list ap;
1928 
1929	va_start(ap, fmt)__builtin_va_start((ap), fmt);
1930	sshpkt_vfatal(ssh, r, fmt, ap);
1931	/* NOTREACHED */
1932	va_end(ap)__builtin_va_end((ap));
1933	logdie_f("should have exited")sshlogdie("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1933
, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "should have exited");
1934}
1935 
1936/*
1937 * Logs the error plus constructs and sends a disconnect packet, closes the
1938 * connection, and exits.  This function never returns. The error message
1939 * should not contain a newline.  The length of the formatted message must
1940 * not exceed 1024 bytes.
1941 */
1942void
1943ssh_packet_disconnect(struct ssh *ssh, const char *fmt,...)
1944{
1945	char buf[1024], remote_id[512];
1946	va_list args;
1947	static int disconnecting = 0;
1948	int r;
1949 
1950	if (disconnecting)	/* Guard against recursive invocations. */
1951		fatal("packet_disconnect called recursively.")sshfatal("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1951
, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "packet_disconnect called recursively."
);
1952	disconnecting = 1;
1953 
1954	/*
1955	 * Format the message.  Note that the caller must make sure the
1956	 * message is of limited size.
1957	 */
1958	sshpkt_fmt_connection_id(ssh, remote_id, sizeof(remote_id));
1959	va_start(args, fmt)__builtin_va_start((args), fmt);
1960	vsnprintf(buf, sizeof(buf), fmt, args);
1961	va_end(args)__builtin_va_end((args));
1962 
1963	/* Display the error locally */
1964	logit("Disconnecting %s: %.100s", remote_id, buf)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 1964
, 0, SYSLOG_LEVEL_INFO, ((void *)0), "Disconnecting %s: %.100s"
, remote_id, buf);
1965 
1966	/*
1967	 * Send the disconnect message to the other side, and wait
1968	 * for it to get sent.
1969	 */
1970	if ((r = sshpkt_disconnect(ssh, "%s", buf)) != 0)
1971		sshpkt_fatal(ssh, r, "%s", __func__);
1972 
1973	if ((r = ssh_packet_write_wait(ssh)) != 0)
1974		sshpkt_fatal(ssh, r, "%s", __func__);
1975 
1976	/* Close the connection. */
1977	ssh_packet_close(ssh);
1978	cleanup_exit(255);
1979}
1980 
1981/*
1982 * Checks if there is any buffered output, and tries to write some of
1983 * the output.
1984 */
1985int
1986ssh_packet_write_poll(struct ssh *ssh)
1987{
1988	struct session_state *state = ssh->state;
1989	int len = sshbuf_len(state->output);
1990	int r;
1991 
1992	if (len > 0) {
1993		len = write(state->connection_out,
1994		    sshbuf_ptr(state->output), len);
1995		if (len == -1) {
1996			if (errno(*__errno()) == EINTR4 || errno(*__errno()) == EAGAIN35)
1997				return 0;
1998			return SSH_ERR_SYSTEM_ERROR-24;
1999		}
2000		if (len == 0)
2001			return SSH_ERR_CONN_CLOSED-52;
2002		if ((r = sshbuf_consume(state->output, len)) != 0)
2003			return r;
2004	}
2005	return 0;
2006}
2007 
2008/*
2009 * Calls packet_write_poll repeatedly until all pending output data has been
2010 * written.
2011 */
2012int
2013ssh_packet_write_wait(struct ssh *ssh)
2014{
2015	int ret, r, ms_remain = 0;
2016	struct timeval start;
2017	struct timespec timespec, *timespecp = NULL((void *)0);
2018	struct session_state *state = ssh->state;
2019	struct pollfd pfd;
2020 
2021	if ((r = ssh_packet_write_poll(ssh)) != 0)
2022		return r;
2023	while (ssh_packet_have_data_to_write(ssh)) {
2024		pfd.fd = state->connection_out;
2025		pfd.events = POLLOUT0x0004;
2026 
2027		if (state->packet_timeout_ms > 0) {
2028			ms_remain = state->packet_timeout_ms;
2029			timespecp = &timespec;
2030		}
2031		for (;;) {
2032			if (state->packet_timeout_ms > 0) {
2033				ms_to_timespec(&timespec, ms_remain);
2034				monotime_tv(&start);
2035			}
2036			if ((ret = ppoll(&pfd, 1, timespecp, NULL((void *)0))) >= 0)
2037				break;
2038			if (errno(*__errno()) != EAGAIN35 && errno(*__errno()) != EINTR4)
2039				break;
2040			if (state->packet_timeout_ms <= 0)
2041				continue;
2042			ms_subtract_diff(&start, &ms_remain);
2043			if (ms_remain <= 0) {
2044				ret = 0;
2045				break;
2046			}
2047		}
2048		if (ret == 0)
2049			return SSH_ERR_CONN_TIMEOUT-53;
2050		if ((r = ssh_packet_write_poll(ssh)) != 0)
2051			return r;
2052	}
2053	return 0;
2054}
2055 
2056/* Returns true if there is buffered data to write to the connection. */
2057 
2058int
2059ssh_packet_have_data_to_write(struct ssh *ssh)
2060{
2061	return sshbuf_len(ssh->state->output) != 0;
2062}
2063 
2064/* Returns true if there is not too much data to write to the connection. */
2065 
2066int
2067ssh_packet_not_very_much_data_to_write(struct ssh *ssh)
2068{
2069	if (ssh->state->interactive_mode)
2070		return sshbuf_len(ssh->state->output) < 16384;
2071	else
2072		return sshbuf_len(ssh->state->output) < 128 * 1024;
2073}
2074 
2075/*
2076 * returns true when there are at most a few keystrokes of data to write
2077 * and the connection is in interactive mode.
2078 */
2079 
2080int
2081ssh_packet_interactive_data_to_write(struct ssh *ssh)
2082{
2083	return ssh->state->interactive_mode &&
2084	    sshbuf_len(ssh->state->output) < 256;
2085}
2086 
2087void
2088ssh_packet_set_tos(struct ssh *ssh, int tos)
2089{
2090	if (!ssh_packet_connection_is_on_socket(ssh) || tos == INT_MAX0x7fffffff)
2091		return;
2092	set_sock_tos(ssh->state->connection_in, tos);
2093}
2094 
2095/* Informs that the current session is interactive.  Sets IP flags for that. */
2096 
2097void
2098ssh_packet_set_interactive(struct ssh *ssh, int interactive, int qos_interactive, int qos_bulk)
2099{
2100	struct session_state *state = ssh->state;
2101 
2102	if (state->set_interactive_called)
2103		return;
2104	state->set_interactive_called = 1;
2105 
2106	/* Record that we are in interactive mode. */
2107	state->interactive_mode = interactive;
2108 
2109	/* Only set socket options if using a socket.  */
2110	if (!ssh_packet_connection_is_on_socket(ssh))
2111		return;
2112	set_nodelay(state->connection_in);
2113	ssh_packet_set_tos(ssh, interactive ? qos_interactive : qos_bulk);
2114}
2115 
2116/* Returns true if the current connection is interactive. */
2117 
2118int
2119ssh_packet_is_interactive(struct ssh *ssh)
2120{
2121	return ssh->state->interactive_mode;
2122}
2123 
2124int
2125ssh_packet_set_maxsize(struct ssh *ssh, u_int s)
2126{
2127	struct session_state *state = ssh->state;
2128 
2129	if (state->set_maxsize_called) {
2130		logit_f("called twice: old %d new %d",sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 2131
, 1, SYSLOG_LEVEL_INFO, ((void *)0), "called twice: old %d new %d"
, state->max_packet_size, s)
2131		    state->max_packet_size, s)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 2131
, 1, SYSLOG_LEVEL_INFO, ((void *)0), "called twice: old %d new %d"
, state->max_packet_size, s);
2132		return -1;
2133	}
2134	if (s < 4 * 1024 || s > 1024 * 1024) {
2135		logit_f("bad size %d", s)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 2135
, 1, SYSLOG_LEVEL_INFO, ((void *)0), "bad size %d", s);
2136		return -1;
2137	}
2138	state->set_maxsize_called = 1;
2139	debug_f("setting to %d", s)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 2139
, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "setting to %d", s);
2140	state->max_packet_size = s;
2141	return s;
2142}
2143 
2144int
2145ssh_packet_inc_alive_timeouts(struct ssh *ssh)
2146{
2147	return ++ssh->state->keep_alive_timeouts;
2148}
2149 
2150void
2151ssh_packet_set_alive_timeouts(struct ssh *ssh, int ka)
2152{
2153	ssh->state->keep_alive_timeouts = ka;
2154}
2155 
2156u_int
2157ssh_packet_get_maxsize(struct ssh *ssh)
2158{
2159	return ssh->state->max_packet_size;
2160}
2161 
2162void
2163ssh_packet_set_rekey_limits(struct ssh *ssh, u_int64_t bytes, u_int32_t seconds)
2164{
2165	debug3("rekey after %llu bytes, %u seconds", (unsigned long long)bytes,sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 2166
, 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "rekey after %llu bytes, %u seconds"
, (unsigned long long)bytes, (unsigned int)seconds)
2166	    (unsigned int)seconds)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 2166
, 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "rekey after %llu bytes, %u seconds"
, (unsigned long long)bytes, (unsigned int)seconds);
2167	ssh->state->rekey_limit = bytes;
2168	ssh->state->rekey_interval = seconds;
2169}
2170 
2171time_t
2172ssh_packet_get_rekey_timeout(struct ssh *ssh)
2173{
2174	time_t seconds;
2175 
2176	seconds = ssh->state->rekey_time + ssh->state->rekey_interval -
2177	    monotime();
2178	return (seconds <= 0 ? 1 : seconds);
2179}
2180 
2181void
2182ssh_packet_set_server(struct ssh *ssh)
2183{
2184	ssh->state->server_side = 1;
2185	ssh->kex->server = 1; /* XXX unify? */
2186}
2187 
2188void
2189ssh_packet_set_authenticated(struct ssh *ssh)
2190{
2191	ssh->state->after_authentication = 1;
2192}
2193 
2194void *
2195ssh_packet_get_input(struct ssh *ssh)
2196{
2197	return (void *)ssh->state->input;
2198}
2199 
2200void *
2201ssh_packet_get_output(struct ssh *ssh)
2202{
2203	return (void *)ssh->state->output;
2204}
2205 
2206/* Reset after_authentication and reset compression in post-auth privsep */
2207static int
2208ssh_packet_set_postauth(struct ssh *ssh)
2209{
2210	int r;
2211 
2212	debug_f("called")sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 2212
, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "called");
2213	/* This was set in net child, but is not visible in user child */
2214	ssh->state->after_authentication = 1;
2215	ssh->state->rekeying = 0;
2216	if ((r = ssh_packet_enable_delayed_compress(ssh)) != 0)
2217		return r;
2218	return 0;
2219}
2220 
2221/* Packet state (de-)serialization for privsep */
2222 
2223/* turn kex into a blob for packet state serialization */
2224static int
2225kex_to_blob(struct sshbuf *m, struct kex *kex)
2226{
2227	int r;
2228 
2229	if ((r = sshbuf_put_u32(m, kex->we_need)) != 0 ||
2230	    (r = sshbuf_put_cstring(m, kex->hostkey_alg)) != 0 ||
2231	    (r = sshbuf_put_u32(m, kex->hostkey_type)) != 0 ||
2232	    (r = sshbuf_put_u32(m, kex->hostkey_nid)) != 0 ||
2233	    (r = sshbuf_put_u32(m, kex->kex_type)) != 0 ||
2234	    (r = sshbuf_put_u32(m, kex->kex_strict)) != 0 ||
2235	    (r = sshbuf_put_stringb(m, kex->my)) != 0 ||
2236	    (r = sshbuf_put_stringb(m, kex->peer)) != 0 ||
2237	    (r = sshbuf_put_stringb(m, kex->client_version)) != 0 ||
2238	    (r = sshbuf_put_stringb(m, kex->server_version)) != 0 ||
2239	    (r = sshbuf_put_stringb(m, kex->session_id)) != 0 ||
2240	    (r = sshbuf_put_u32(m, kex->flags)) != 0)
2241		return r;
2242	return 0;
2243}
2244 
2245/* turn key exchange results into a blob for packet state serialization */
2246static int
2247newkeys_to_blob(struct sshbuf *m, struct ssh *ssh, int mode)
2248{
2249	struct sshbuf *b;
2250	struct sshcipher_ctx *cc;
2251	struct sshcomp *comp;
2252	struct sshenc *enc;
2253	struct sshmac *mac;
2254	struct newkeys *newkey;
2255	int r;
2256 
2257	if ((newkey = ssh->state->newkeys[mode]) == NULL((void *)0))
2258		return SSH_ERR_INTERNAL_ERROR-1;
2259	enc = &newkey->enc;
2260	mac = &newkey->mac;
2261	comp = &newkey->comp;
2262	cc = (mode == MODE_OUT) ? ssh->state->send_context :
2263	    ssh->state->receive_context;
2264	if ((r = cipher_get_keyiv(cc, enc->iv, enc->iv_len)) != 0)
2265		return r;
2266	if ((b = sshbuf_new()) == NULL((void *)0))
2267		return SSH_ERR_ALLOC_FAIL-2;
2268	if ((r = sshbuf_put_cstring(b, enc->name)) != 0 ||
2269	    (r = sshbuf_put_u32(b, enc->enabled)) != 0 ||
2270	    (r = sshbuf_put_u32(b, enc->block_size)) != 0 ||
2271	    (r = sshbuf_put_string(b, enc->key, enc->key_len)) != 0 ||
2272	    (r = sshbuf_put_string(b, enc->iv, enc->iv_len)) != 0)
2273		goto out;
2274	if (cipher_authlen(enc->cipher) == 0) {
2275		if ((r = sshbuf_put_cstring(b, mac->name)) != 0 ||
2276		    (r = sshbuf_put_u32(b, mac->enabled)) != 0 ||
2277		    (r = sshbuf_put_string(b, mac->key, mac->key_len)) != 0)
2278			goto out;
2279	}
2280	if ((r = sshbuf_put_u32(b, comp->type)) != 0 ||
2281	    (r = sshbuf_put_cstring(b, comp->name)) != 0)
2282		goto out;
2283	r = sshbuf_put_stringb(m, b);
2284 out:
2285	sshbuf_free(b);
2286	return r;
2287}
2288 
2289/* serialize packet state into a blob */
2290int
2291ssh_packet_get_state(struct ssh *ssh, struct sshbuf *m)
2292{
2293	struct session_state *state = ssh->state;
2294	int r;
2295 
2296	if ((r = kex_to_blob(m, ssh->kex)) != 0 ||
2297	    (r = newkeys_to_blob(m, ssh, MODE_OUT)) != 0 ||
2298	    (r = newkeys_to_blob(m, ssh, MODE_IN)) != 0 ||
2299	    (r = sshbuf_put_u64(m, state->rekey_limit)) != 0 ||
2300	    (r = sshbuf_put_u32(m, state->rekey_interval)) != 0 ||
2301	    (r = sshbuf_put_u32(m, state->p_send.seqnr)) != 0 ||
2302	    (r = sshbuf_put_u64(m, state->p_send.blocks)) != 0 ||
2303	    (r = sshbuf_put_u32(m, state->p_send.packets)) != 0 ||
2304	    (r = sshbuf_put_u64(m, state->p_send.bytes)) != 0 ||
2305	    (r = sshbuf_put_u32(m, state->p_read.seqnr)) != 0 ||
2306	    (r = sshbuf_put_u64(m, state->p_read.blocks)) != 0 ||
2307	    (r = sshbuf_put_u32(m, state->p_read.packets)) != 0 ||
2308	    (r = sshbuf_put_u64(m, state->p_read.bytes)) != 0 ||
2309	    (r = sshbuf_put_stringb(m, state->input)) != 0 ||
2310	    (r = sshbuf_put_stringb(m, state->output)) != 0)
2311		return r;
2312 
2313	return 0;
2314}
2315 
2316/* restore key exchange results from blob for packet state de-serialization */
2317static int
2318newkeys_from_blob(struct sshbuf *m, struct ssh *ssh, int mode)
2319{
2320	struct sshbuf *b = NULL((void *)0);
2321	struct sshcomp *comp;
2322	struct sshenc *enc;
2323	struct sshmac *mac;
2324	struct newkeys *newkey = NULL((void *)0);
2325	size_t keylen, ivlen, maclen;
2326	int r;
2327 
2328	if ((newkey = calloc(1, sizeof(*newkey))) == NULL((void *)0)) {
2329		r = SSH_ERR_ALLOC_FAIL-2;
2330		goto out;
2331	}
2332	if ((r = sshbuf_froms(m, &b)) != 0)
2333		goto out;
2334#ifdef DEBUG_PK
2335	sshbuf_dump(b, stderr(&__sF[2]));
2336#endif
2337	enc = &newkey->enc;
2338	mac = &newkey->mac;
2339	comp = &newkey->comp;
2340 
2341	if ((r = sshbuf_get_cstring(b, &enc->name, NULL((void *)0))) != 0 ||
2342	    (r = sshbuf_get_u32(b, (u_int *)&enc->enabled)) != 0 ||
2343	    (r = sshbuf_get_u32(b, &enc->block_size)) != 0 ||
2344	    (r = sshbuf_get_string(b, &enc->key, &keylen)) != 0 ||
2345	    (r = sshbuf_get_string(b, &enc->iv, &ivlen)) != 0)
2346		goto out;
2347	if ((enc->cipher = cipher_by_name(enc->name)) == NULL((void *)0)) {
2348		r = SSH_ERR_INVALID_FORMAT-4;
2349		goto out;
2350	}
2351	if (cipher_authlen(enc->cipher) == 0) {
2352		if ((r = sshbuf_get_cstring(b, &mac->name, NULL((void *)0))) != 0)
2353			goto out;
2354		if ((r = mac_setup(mac, mac->name)) != 0)
2355			goto out;
2356		if ((r = sshbuf_get_u32(b, (u_int *)&mac->enabled)) != 0 ||
2357		    (r = sshbuf_get_string(b, &mac->key, &maclen)) != 0)
2358			goto out;
2359		if (maclen > mac->key_len) {
2360			r = SSH_ERR_INVALID_FORMAT-4;
2361			goto out;
2362		}
2363		mac->key_len = maclen;
2364	}
2365	if ((r = sshbuf_get_u32(b, &comp->type)) != 0 ||
2366	    (r = sshbuf_get_cstring(b, &comp->name, NULL((void *)0))) != 0)
2367		goto out;
2368	if (sshbuf_len(b) != 0) {
2369		r = SSH_ERR_INVALID_FORMAT-4;
2370		goto out;
2371	}
2372	enc->key_len = keylen;
2373	enc->iv_len = ivlen;
2374	ssh->kex->newkeys[mode] = newkey;
2375	newkey = NULL((void *)0);
2376	r = 0;
2377 out:
2378	free(newkey);
2379	sshbuf_free(b);
2380	return r;
2381}
2382 
2383/* restore kex from blob for packet state de-serialization */
2384static int
2385kex_from_blob(struct sshbuf *m, struct kex **kexp)
2386{
2387	struct kex *kex;
2388	int r;
2389 
2390	if ((kex = kex_new()) == NULL((void *)0))
2391		return SSH_ERR_ALLOC_FAIL-2;
2392	if ((r = sshbuf_get_u32(m, &kex->we_need)) != 0 ||
2393	    (r = sshbuf_get_cstring(m, &kex->hostkey_alg, NULL((void *)0))) != 0 ||
2394	    (r = sshbuf_get_u32(m, (u_int *)&kex->hostkey_type)) != 0 ||
2395	    (r = sshbuf_get_u32(m, (u_int *)&kex->hostkey_nid)) != 0 ||
2396	    (r = sshbuf_get_u32(m, &kex->kex_type)) != 0 ||
2397	    (r = sshbuf_get_u32(m, &kex->kex_strict)) != 0 ||
2398	    (r = sshbuf_get_stringb(m, kex->my)) != 0 ||
2399	    (r = sshbuf_get_stringb(m, kex->peer)) != 0 ||
2400	    (r = sshbuf_get_stringb(m, kex->client_version)) != 0 ||
2401	    (r = sshbuf_get_stringb(m, kex->server_version)) != 0 ||
2402	    (r = sshbuf_get_stringb(m, kex->session_id)) != 0 ||
2403	    (r = sshbuf_get_u32(m, &kex->flags)) != 0)
2404		goto out;
2405	kex->server = 1;
2406	kex->done = 1;
2407	r = 0;
2408 out:
2409	if (r != 0 || kexp == NULL((void *)0)) {
2410		kex_free(kex);
2411		if (kexp != NULL((void *)0))
2412			*kexp = NULL((void *)0);
2413	} else {
2414		kex_free(*kexp);
2415		*kexp = kex;
2416	}
2417	return r;
2418}
2419 
2420/*
2421 * Restore packet state from content of blob 'm' (de-serialization).
2422 * Note that 'm' will be partially consumed on parsing or any other errors.
2423 */
2424int
2425ssh_packet_set_state(struct ssh *ssh, struct sshbuf *m)
2426{
2427	struct session_state *state = ssh->state;
2428	const u_char *input, *output;
2429	size_t ilen, olen;
2430	int r;
2431 
2432	if ((r = kex_from_blob(m, &ssh->kex)) != 0 ||
2433	    (r = newkeys_from_blob(m, ssh, MODE_OUT)) != 0 ||
2434	    (r = newkeys_from_blob(m, ssh, MODE_IN)) != 0 ||
2435	    (r = sshbuf_get_u64(m, &state->rekey_limit)) != 0 ||
2436	    (r = sshbuf_get_u32(m, &state->rekey_interval)) != 0 ||
2437	    (r = sshbuf_get_u32(m, &state->p_send.seqnr)) != 0 ||
2438	    (r = sshbuf_get_u64(m, &state->p_send.blocks)) != 0 ||
2439	    (r = sshbuf_get_u32(m, &state->p_send.packets)) != 0 ||
2440	    (r = sshbuf_get_u64(m, &state->p_send.bytes)) != 0 ||
2441	    (r = sshbuf_get_u32(m, &state->p_read.seqnr)) != 0 ||
2442	    (r = sshbuf_get_u64(m, &state->p_read.blocks)) != 0 ||
2443	    (r = sshbuf_get_u32(m, &state->p_read.packets)) != 0 ||
2444	    (r = sshbuf_get_u64(m, &state->p_read.bytes)) != 0)
2445		return r;
2446	/*
2447	 * We set the time here so that in post-auth privsep child we
2448	 * count from the completion of the authentication.
2449	 */
2450	state->rekey_time = monotime();
2451	/* XXX ssh_set_newkeys overrides p_read.packets? XXX */
2452	if ((r = ssh_set_newkeys(ssh, MODE_IN)) != 0 ||
2453	    (r = ssh_set_newkeys(ssh, MODE_OUT)) != 0)
2454		return r;
2455 
2456	if ((r = ssh_packet_set_postauth(ssh)) != 0)
2457		return r;
2458 
2459	sshbuf_reset(state->input);
2460	sshbuf_reset(state->output);
2461	if ((r = sshbuf_get_string_direct(m, &input, &ilen)) != 0 ||
2462	    (r = sshbuf_get_string_direct(m, &output, &olen)) != 0 ||
2463	    (r = sshbuf_put(state->input, input, ilen)) != 0 ||
2464	    (r = sshbuf_put(state->output, output, olen)) != 0)
2465		return r;
2466 
2467	if (sshbuf_len(m))
2468		return SSH_ERR_INVALID_FORMAT-4;
2469	debug3_f("done")sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 2469
, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "done");
2470	return 0;
2471}
2472 
2473/* NEW API */
2474 
2475/* put data to the outgoing packet */
2476 
2477int
2478sshpkt_put(struct ssh *ssh, const void *v, size_t len)
2479{
2480	return sshbuf_put(ssh->state->outgoing_packet, v, len);
2481}
2482 
2483int
2484sshpkt_putb(struct ssh *ssh, const struct sshbuf *b)
2485{
2486	return sshbuf_putb(ssh->state->outgoing_packet, b);
2487}
2488 
2489int
2490sshpkt_put_u8(struct ssh *ssh, u_char val)
2491{
2492	return sshbuf_put_u8(ssh->state->outgoing_packet, val);
2493}
2494 
2495int
2496sshpkt_put_u32(struct ssh *ssh, u_int32_t val)
2497{
2498	return sshbuf_put_u32(ssh->state->outgoing_packet, val);
2499}
2500 
2501int
2502sshpkt_put_u64(struct ssh *ssh, u_int64_t val)
2503{
2504	return sshbuf_put_u64(ssh->state->outgoing_packet, val);
2505}
2506 
2507int
2508sshpkt_put_string(struct ssh *ssh, const void *v, size_t len)
2509{
2510	return sshbuf_put_string(ssh->state->outgoing_packet, v, len);
2511}
2512 
2513int
2514sshpkt_put_cstring(struct ssh *ssh, const void *v)
2515{
2516	return sshbuf_put_cstring(ssh->state->outgoing_packet, v);
2517}
2518 
2519int
2520sshpkt_put_stringb(struct ssh *ssh, const struct sshbuf *v)
2521{
2522	return sshbuf_put_stringb(ssh->state->outgoing_packet, v);
2523}
2524 
2525#ifdef WITH_OPENSSL1
2526int
2527sshpkt_put_ec(struct ssh *ssh, const EC_POINT *v, const EC_GROUP *g)
2528{
2529	return sshbuf_put_ec(ssh->state->outgoing_packet, v, g);
2530}
2531 
2532 
2533int
2534sshpkt_put_bignum2(struct ssh *ssh, const BIGNUM *v)
2535{
2536	return sshbuf_put_bignum2(ssh->state->outgoing_packet, v);
2537}
2538#endif /* WITH_OPENSSL */
2539 
2540/* fetch data from the incoming packet */
2541 
2542int
2543sshpkt_get(struct ssh *ssh, void *valp, size_t len)
2544{
2545	return sshbuf_get(ssh->state->incoming_packet, valp, len);
2546}
2547 
2548int
2549sshpkt_get_u8(struct ssh *ssh, u_char *valp)
2550{
2551	return sshbuf_get_u8(ssh->state->incoming_packet, valp);
2552}
2553 
2554int
2555sshpkt_get_u32(struct ssh *ssh, u_int32_t *valp)
2556{
2557	return sshbuf_get_u32(ssh->state->incoming_packet, valp);
2558}
2559 
2560int
2561sshpkt_get_u64(struct ssh *ssh, u_int64_t *valp)
2562{
2563	return sshbuf_get_u64(ssh->state->incoming_packet, valp);
2564}
2565 
2566int
2567sshpkt_get_string(struct ssh *ssh, u_char **valp, size_t *lenp)
2568{
2569	return sshbuf_get_string(ssh->state->incoming_packet, valp, lenp);
2570}
2571 
2572int
2573sshpkt_get_string_direct(struct ssh *ssh, const u_char **valp, size_t *lenp)
2574{
2575	return sshbuf_get_string_direct(ssh->state->incoming_packet, valp, lenp);
2576}
2577 
2578int
2579sshpkt_peek_string_direct(struct ssh *ssh, const u_char **valp, size_t *lenp)
2580{
2581	return sshbuf_peek_string_direct(ssh->state->incoming_packet, valp, lenp);
2582}
2583 
2584int
2585sshpkt_get_cstring(struct ssh *ssh, char **valp, size_t *lenp)
2586{
2587	return sshbuf_get_cstring(ssh->state->incoming_packet, valp, lenp);
2588}
2589 
2590int
2591sshpkt_getb_froms(struct ssh *ssh, struct sshbuf **valp)
2592{
2593	return sshbuf_froms(ssh->state->incoming_packet, valp);
2594}
2595 
2596#ifdef WITH_OPENSSL1
2597int
2598sshpkt_get_ec(struct ssh *ssh, EC_POINT *v, const EC_GROUP *g)
2599{
2600	return sshbuf_get_ec(ssh->state->incoming_packet, v, g);
2601}
2602 
2603int
2604sshpkt_get_bignum2(struct ssh *ssh, BIGNUM **valp)
2605{
2606	return sshbuf_get_bignum2(ssh->state->incoming_packet, valp);
2607}
2608#endif /* WITH_OPENSSL */
2609 
2610int
2611sshpkt_get_end(struct ssh *ssh)
2612{
2613	if (sshbuf_len(ssh->state->incoming_packet) > 0)
2614		return SSH_ERR_UNEXPECTED_TRAILING_DATA-23;
2615	return 0;
2616}
2617 
2618const u_char *
2619sshpkt_ptr(struct ssh *ssh, size_t *lenp)
2620{
2621	if (lenp != NULL((void *)0))
2622		*lenp = sshbuf_len(ssh->state->incoming_packet);
2623	return sshbuf_ptr(ssh->state->incoming_packet);
2624}
2625 
2626/* start a new packet */
2627 
2628int
2629sshpkt_start(struct ssh *ssh, u_char type)
2630{
2631	u_char buf[6]; /* u32 packet length, u8 pad len, u8 type */
2632 
2633	DBG(debug("packet_start[%d]", type));
2634	memset(buf, 0, sizeof(buf));
2635	buf[sizeof(buf) - 1] = type;
2636	sshbuf_reset(ssh->state->outgoing_packet);
2637	return sshbuf_put(ssh->state->outgoing_packet, buf, sizeof(buf));
2638}
2639 
2640static int
2641ssh_packet_send_mux(struct ssh *ssh)
2642{
2643	struct session_state *state = ssh->state;
2644	u_char type, *cp;
2645	size_t len;
2646	int r;
2647 
2648	if (ssh->kex)
2649		return SSH_ERR_INTERNAL_ERROR-1;
2650	len = sshbuf_len(state->outgoing_packet);
2651	if (len < 6)
2652		return SSH_ERR_INTERNAL_ERROR-1;
2653	cp = sshbuf_mutable_ptr(state->outgoing_packet);
2654	type = cp[5];
2655	if (ssh_packet_log_type(type))
2656		debug3_f("type %u", type)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 2656
, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "type %u", type);
2657	/* drop everything, but the connection protocol */
2658	if (type >= SSH2_MSG_CONNECTION_MIN80 &&
2659	    type <= SSH2_MSG_CONNECTION_MAX127) {
2660		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);
2661		if ((r = sshbuf_putb(state->output,
2662		    state->outgoing_packet)) != 0)
2663			return r;
2664		/* sshbuf_dump(state->output, stderr); */
2665	}
2666	sshbuf_reset(state->outgoing_packet);
2667	return 0;
2668}
2669 
2670/*
2671 * 9.2.  Ignored Data Message
2672 *
2673 *   byte      SSH_MSG_IGNORE
2674 *   string    data
2675 *
2676 * All implementations MUST understand (and ignore) this message at any
2677 * time (after receiving the protocol version). No implementation is
2678 * required to send them. This message can be used as an additional
2679 * protection measure against advanced traffic analysis techniques.
2680 */
2681int
2682sshpkt_msg_ignore(struct ssh *ssh, u_int nbytes)
2683{
2684	u_int32_t rnd = 0;
2685	int r;
2686	u_int i;
2687 
2688	if ((r = sshpkt_start(ssh, SSH2_MSG_IGNORE2)) != 0 ||
2689	    (r = sshpkt_put_u32(ssh, nbytes)) != 0)
2690		return r;
2691	for (i = 0; i < nbytes; i++) {
2692		if (i % 4 == 0)
2693			rnd = arc4random();
2694		if ((r = sshpkt_put_u8(ssh, (u_char)rnd & 0xff)) != 0)
2695			return r;
2696		rnd >>= 8;
2697	}
2698	return 0;
2699}
2700 
2701/* send it */
2702 
2703int
2704sshpkt_send(struct ssh *ssh)
2705{
2706	if (ssh->state17.1
Field 'state' is non-null
 && ssh->state->mux)
18
←
Assuming field 'mux' is 0→
19
←
Taking false branch→
2707		return ssh_packet_send_mux(ssh);
2708	return ssh_packet_send2(ssh);
20
←
Calling 'ssh_packet_send2'→
2709}
2710 
2711int
2712sshpkt_disconnect(struct ssh *ssh, const char *fmt,...)
2713{
2714	char buf[1024];
2715	va_list args;
2716	int r;
2717 
2718	va_start(args, fmt)__builtin_va_start((args), fmt);
2719	vsnprintf(buf, sizeof(buf), fmt, args);
2720	va_end(args)__builtin_va_end((args));
2721 
2722	debug2_f("sending SSH2_MSG_DISCONNECT: %s", buf)sshlog("/usr/src/usr.bin/ssh/ssh/../packet.c", __func__, 2722
, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "sending SSH2_MSG_DISCONNECT: %s"
, buf);
2723	if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT1)) != 0 ||
2724	    (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_PROTOCOL_ERROR2)) != 0 ||
2725	    (r = sshpkt_put_cstring(ssh, buf)) != 0 ||
2726	    (r = sshpkt_put_cstring(ssh, "")) != 0 ||
2727	    (r = sshpkt_send(ssh)) != 0)
2728		return r;
2729	return 0;
2730}
2731 
2732/* roundup current message to pad bytes */
2733int
2734sshpkt_add_padding(struct ssh *ssh, u_char pad)
2735{
2736	ssh->state->extra_pad = pad;
2737	return 0;
2738}