blob: d0c66fe57cb89ee890404dba751a377c06c57c57 [file] [log] [blame]
Damien Miller72de9822012-02-11 08:19:21 +11001/* $OpenBSD: packet.c,v 1.176 2012/01/25 19:40:09 markus Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11004 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * 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.
Damien Miller33b13562000-04-04 14:38:59 +10008 *
Damien Millere4340be2000-09-16 13:29:08 +11009 * 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".
Damien Miller33b13562000-04-04 14:38:59 +100014 *
Damien Millere4340be2000-09-16 13:29:08 +110015 *
16 * SSH2 packet format added by Markus Friedl.
Ben Lindstrom44697232001-07-04 03:32:30 +000017 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110018 *
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.
Damien Miller95def091999-11-25 00:26:21 +110038 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100039
40#include "includes.h"
Damien Miller68f8e992006-03-15 11:24:12 +110041
Damien Millere3b60b52006-07-10 21:08:03 +100042#include <sys/types.h>
Damien Millera0898b82003-04-09 21:05:52 +100043#include "openbsd-compat/sys-queue.h"
Damien Miller8dbffe72006-08-05 11:02:17 +100044#include <sys/param.h>
Damien Miller8ec8c3e2006-07-10 20:35:38 +100045#include <sys/socket.h>
Damien Miller9aec9192006-08-05 10:57:45 +100046#ifdef HAVE_SYS_TIME_H
47# include <sys/time.h>
48#endif
Damien Miller8ec8c3e2006-07-10 20:35:38 +100049
Damien Miller8ec8c3e2006-07-10 20:35:38 +100050#include <netinet/in.h>
Damien Miller68f8e992006-03-15 11:24:12 +110051#include <netinet/ip.h>
Darren Tuckerdace2332006-09-22 19:22:17 +100052#include <arpa/inet.h>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100053
Darren Tucker39972492006-07-12 22:22:46 +100054#include <errno.h>
Darren Tucker5d196262006-07-12 22:15:16 +100055#include <stdarg.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100056#include <stdio.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100057#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100058#include <string.h>
Damien Millere6b3b612006-07-24 14:01:23 +100059#include <unistd.h>
Damien Millerd7834352006-08-05 12:39:39 +100060#include <signal.h>
Darren Tucker5d196262006-07-12 22:15:16 +100061
Damien Millerd4a8b7e1999-10-27 13:42:43 +100062#include "xmalloc.h"
63#include "buffer.h"
64#include "packet.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100065#include "crc32.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100066#include "compress.h"
67#include "deattack.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000068#include "channels.h"
Damien Miller33b13562000-04-04 14:38:59 +100069#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000070#include "ssh1.h"
Damien Miller33b13562000-04-04 14:38:59 +100071#include "ssh2.h"
Damien Miller874d77b2000-10-14 16:23:11 +110072#include "cipher.h"
Damien Millerd7834352006-08-05 12:39:39 +100073#include "key.h"
Damien Miller33b13562000-04-04 14:38:59 +100074#include "kex.h"
Ben Lindstrom06b33aa2001-02-15 03:01:59 +000075#include "mac.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000076#include "log.h"
77#include "canohost.h"
Damien Miller4d007762002-02-05 11:52:54 +110078#include "misc.h"
Ben Lindstrom402c6cc2002-06-21 00:43:42 +000079#include "ssh.h"
Darren Tuckerc5564e12009-06-21 18:53:53 +100080#include "roaming.h"
Damien Miller33b13562000-04-04 14:38:59 +100081
82#ifdef PACKET_DEBUG
83#define DBG(x) x
84#else
85#define DBG(x)
86#endif
87
Damien Miller13ae44c2009-01-28 16:38:41 +110088#define PACKET_MAX_SIZE (256 * 1024)
89
Darren Tuckerf7288d72009-06-21 18:12:20 +100090struct packet_state {
Damien Millera5539d22003-04-09 20:50:06 +100091 u_int32_t seqnr;
92 u_int32_t packets;
93 u_int64_t blocks;
Damien Millerb61f3fc2008-07-11 17:36:48 +100094 u_int64_t bytes;
Darren Tuckerf7288d72009-06-21 18:12:20 +100095};
Damien Miller13ae44c2009-01-28 16:38:41 +110096
Damien Millera5539d22003-04-09 20:50:06 +100097struct packet {
98 TAILQ_ENTRY(packet) next;
99 u_char type;
100 Buffer payload;
101};
Darren Tuckerf7288d72009-06-21 18:12:20 +1000102
103struct session_state {
104 /*
105 * This variable contains the file descriptors used for
106 * communicating with the other side. connection_in is used for
107 * reading; connection_out for writing. These can be the same
108 * descriptor, in which case it is assumed to be a socket.
109 */
110 int connection_in;
111 int connection_out;
112
113 /* Protocol flags for the remote side. */
114 u_int remote_protocol_flags;
115
116 /* Encryption context for receiving data. Only used for decryption. */
117 CipherContext receive_context;
118
119 /* Encryption context for sending data. Only used for encryption. */
120 CipherContext send_context;
121
122 /* Buffer for raw input data from the socket. */
123 Buffer input;
124
125 /* Buffer for raw output data going to the socket. */
126 Buffer output;
127
128 /* Buffer for the partial outgoing packet being constructed. */
129 Buffer outgoing_packet;
130
131 /* Buffer for the incoming packet currently being processed. */
132 Buffer incoming_packet;
133
134 /* Scratch buffer for packet compression/decompression. */
135 Buffer compression_buffer;
136 int compression_buffer_ready;
137
138 /*
139 * Flag indicating whether packet compression/decompression is
140 * enabled.
141 */
142 int packet_compression;
143
144 /* default maximum packet size */
145 u_int max_packet_size;
146
147 /* Flag indicating whether this module has been initialized. */
148 int initialized;
149
150 /* Set to true if the connection is interactive. */
151 int interactive_mode;
152
153 /* Set to true if we are the server side. */
154 int server_side;
155
156 /* Set to true if we are authenticated. */
157 int after_authentication;
158
159 int keep_alive_timeouts;
160
161 /* The maximum time that we will wait to send or receive a packet */
162 int packet_timeout_ms;
163
164 /* Session key information for Encryption and MAC */
165 Newkeys *newkeys[MODE_MAX];
166 struct packet_state p_read, p_send;
167
168 u_int64_t max_blocks_in, max_blocks_out;
169 u_int32_t rekey_limit;
170
171 /* Session key for protocol v1 */
172 u_char ssh1_key[SSH_SESSION_KEY_LENGTH];
173 u_int ssh1_keylen;
174
175 /* roundup current message to extra_pad bytes */
176 u_char extra_pad;
177
178 /* XXX discard incoming data after MAC error */
179 u_int packet_discard;
180 Mac *packet_discard_mac;
181
182 /* Used in packet_read_poll2() */
183 u_int packlen;
184
Darren Tucker7b935c72009-06-21 18:59:36 +1000185 /* Used in packet_send2 */
186 int rekeying;
187
188 /* Used in packet_set_interactive */
189 int set_interactive_called;
190
191 /* Used in packet_set_maxsize */
192 int set_maxsize_called;
193
Darren Tuckerf7288d72009-06-21 18:12:20 +1000194 TAILQ_HEAD(, packet) outgoing;
195};
196
Darren Tuckere841eb02009-07-06 07:11:13 +1000197static struct session_state *active_state, *backup_state;
Darren Tuckerf7288d72009-06-21 18:12:20 +1000198
199static struct session_state *
Darren Tuckerb422afa2009-06-21 18:58:46 +1000200alloc_session_state(void)
Darren Tuckerf7288d72009-06-21 18:12:20 +1000201{
Damien Miller7a221a12010-11-20 15:14:29 +1100202 struct session_state *s = xcalloc(1, sizeof(*s));
Darren Tuckerf7288d72009-06-21 18:12:20 +1000203
Damien Miller7a221a12010-11-20 15:14:29 +1100204 s->connection_in = -1;
205 s->connection_out = -1;
206 s->max_packet_size = 32768;
207 s->packet_timeout_ms = -1;
208 return s;
Darren Tuckerf7288d72009-06-21 18:12:20 +1000209}
Damien Millera5539d22003-04-09 20:50:06 +1000210
Damien Miller5428f641999-11-25 11:54:57 +1100211/*
212 * Sets the descriptors used for communication. Disables encryption until
213 * packet_set_encryption_key is called.
214 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000215void
216packet_set_connection(int fd_in, int fd_out)
217{
Damien Miller874d77b2000-10-14 16:23:11 +1100218 Cipher *none = cipher_by_name("none");
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000219
Damien Miller874d77b2000-10-14 16:23:11 +1100220 if (none == NULL)
221 fatal("packet_set_connection: cannot load cipher 'none'");
Darren Tuckerf7288d72009-06-21 18:12:20 +1000222 if (active_state == NULL)
223 active_state = alloc_session_state();
224 active_state->connection_in = fd_in;
225 active_state->connection_out = fd_out;
226 cipher_init(&active_state->send_context, none, (const u_char *)"",
Darren Tucker1f8311c2004-05-13 16:39:33 +1000227 0, NULL, 0, CIPHER_ENCRYPT);
Darren Tuckerf7288d72009-06-21 18:12:20 +1000228 cipher_init(&active_state->receive_context, none, (const u_char *)"",
Darren Tucker1f8311c2004-05-13 16:39:33 +1000229 0, NULL, 0, CIPHER_DECRYPT);
Darren Tuckerf7288d72009-06-21 18:12:20 +1000230 active_state->newkeys[MODE_IN] = active_state->newkeys[MODE_OUT] = NULL;
231 if (!active_state->initialized) {
232 active_state->initialized = 1;
233 buffer_init(&active_state->input);
234 buffer_init(&active_state->output);
235 buffer_init(&active_state->outgoing_packet);
236 buffer_init(&active_state->incoming_packet);
237 TAILQ_INIT(&active_state->outgoing);
238 active_state->p_send.packets = active_state->p_read.packets = 0;
Damien Miller95def091999-11-25 00:26:21 +1100239 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000240}
241
Darren Tucker3fc464e2008-06-13 06:42:45 +1000242void
243packet_set_timeout(int timeout, int count)
244{
Damien Miller8ed4de82011-12-19 10:52:50 +1100245 if (timeout <= 0 || count <= 0) {
Darren Tuckerf7288d72009-06-21 18:12:20 +1000246 active_state->packet_timeout_ms = -1;
Darren Tucker3fc464e2008-06-13 06:42:45 +1000247 return;
248 }
249 if ((INT_MAX / 1000) / count < timeout)
Darren Tuckerf7288d72009-06-21 18:12:20 +1000250 active_state->packet_timeout_ms = INT_MAX;
Darren Tucker3fc464e2008-06-13 06:42:45 +1000251 else
Darren Tuckerf7288d72009-06-21 18:12:20 +1000252 active_state->packet_timeout_ms = timeout * count * 1000;
Darren Tucker3fc464e2008-06-13 06:42:45 +1000253}
254
Damien Miller13ae44c2009-01-28 16:38:41 +1100255static void
256packet_stop_discard(void)
257{
Darren Tuckerf7288d72009-06-21 18:12:20 +1000258 if (active_state->packet_discard_mac) {
Damien Miller13ae44c2009-01-28 16:38:41 +1100259 char buf[1024];
260
261 memset(buf, 'a', sizeof(buf));
Darren Tuckerf7288d72009-06-21 18:12:20 +1000262 while (buffer_len(&active_state->incoming_packet) <
263 PACKET_MAX_SIZE)
264 buffer_append(&active_state->incoming_packet, buf,
265 sizeof(buf));
266 (void) mac_compute(active_state->packet_discard_mac,
267 active_state->p_read.seqnr,
268 buffer_ptr(&active_state->incoming_packet),
Damien Miller13ae44c2009-01-28 16:38:41 +1100269 PACKET_MAX_SIZE);
270 }
271 logit("Finished discarding for %.200s", get_remote_ipaddr());
272 cleanup_exit(255);
273}
274
275static void
276packet_start_discard(Enc *enc, Mac *mac, u_int packet_length, u_int discard)
277{
Damien Miller61433be2009-02-14 16:35:01 +1100278 if (enc == NULL || !cipher_is_cbc(enc->cipher))
Damien Miller13ae44c2009-01-28 16:38:41 +1100279 packet_disconnect("Packet corrupt");
280 if (packet_length != PACKET_MAX_SIZE && mac && mac->enabled)
Darren Tuckerf7288d72009-06-21 18:12:20 +1000281 active_state->packet_discard_mac = mac;
282 if (buffer_len(&active_state->input) >= discard)
Damien Miller13ae44c2009-01-28 16:38:41 +1100283 packet_stop_discard();
Darren Tuckerf7288d72009-06-21 18:12:20 +1000284 active_state->packet_discard = discard -
285 buffer_len(&active_state->input);
Damien Miller13ae44c2009-01-28 16:38:41 +1100286}
287
Damien Miller34132e52000-01-14 15:45:46 +1100288/* Returns 1 if remote host is connected via socket, 0 if not. */
289
290int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000291packet_connection_is_on_socket(void)
Damien Miller34132e52000-01-14 15:45:46 +1100292{
293 struct sockaddr_storage from, to;
294 socklen_t fromlen, tolen;
295
296 /* filedescriptors in and out are the same, so it's a socket */
Darren Tuckerf7288d72009-06-21 18:12:20 +1000297 if (active_state->connection_in == active_state->connection_out)
Damien Miller34132e52000-01-14 15:45:46 +1100298 return 1;
299 fromlen = sizeof(from);
300 memset(&from, 0, sizeof(from));
Darren Tuckerf7288d72009-06-21 18:12:20 +1000301 if (getpeername(active_state->connection_in, (struct sockaddr *)&from,
302 &fromlen) < 0)
Damien Miller34132e52000-01-14 15:45:46 +1100303 return 0;
304 tolen = sizeof(to);
305 memset(&to, 0, sizeof(to));
Darren Tuckerf7288d72009-06-21 18:12:20 +1000306 if (getpeername(active_state->connection_out, (struct sockaddr *)&to,
307 &tolen) < 0)
Damien Miller34132e52000-01-14 15:45:46 +1100308 return 0;
309 if (fromlen != tolen || memcmp(&from, &to, fromlen) != 0)
310 return 0;
311 if (from.ss_family != AF_INET && from.ss_family != AF_INET6)
312 return 0;
313 return 1;
314}
315
Ben Lindstrom6328ab32002-03-22 02:54:23 +0000316/*
Ben Lindstromf6027d32002-03-22 01:42:04 +0000317 * Exports an IV from the CipherContext required to export the key
318 * state back from the unprivileged child to the privileged parent
319 * process.
320 */
321
322void
323packet_get_keyiv(int mode, u_char *iv, u_int len)
324{
325 CipherContext *cc;
326
327 if (mode == MODE_OUT)
Darren Tuckerf7288d72009-06-21 18:12:20 +1000328 cc = &active_state->send_context;
Ben Lindstromf6027d32002-03-22 01:42:04 +0000329 else
Darren Tuckerf7288d72009-06-21 18:12:20 +1000330 cc = &active_state->receive_context;
Ben Lindstromf6027d32002-03-22 01:42:04 +0000331
332 cipher_get_keyiv(cc, iv, len);
333}
334
335int
336packet_get_keycontext(int mode, u_char *dat)
337{
338 CipherContext *cc;
Ben Lindstrom6328ab32002-03-22 02:54:23 +0000339
Ben Lindstromf6027d32002-03-22 01:42:04 +0000340 if (mode == MODE_OUT)
Darren Tuckerf7288d72009-06-21 18:12:20 +1000341 cc = &active_state->send_context;
Ben Lindstromf6027d32002-03-22 01:42:04 +0000342 else
Darren Tuckerf7288d72009-06-21 18:12:20 +1000343 cc = &active_state->receive_context;
Ben Lindstromf6027d32002-03-22 01:42:04 +0000344
345 return (cipher_get_keycontext(cc, dat));
346}
347
348void
349packet_set_keycontext(int mode, u_char *dat)
350{
351 CipherContext *cc;
Ben Lindstrom6328ab32002-03-22 02:54:23 +0000352
Ben Lindstromf6027d32002-03-22 01:42:04 +0000353 if (mode == MODE_OUT)
Darren Tuckerf7288d72009-06-21 18:12:20 +1000354 cc = &active_state->send_context;
Ben Lindstromf6027d32002-03-22 01:42:04 +0000355 else
Darren Tuckerf7288d72009-06-21 18:12:20 +1000356 cc = &active_state->receive_context;
Ben Lindstromf6027d32002-03-22 01:42:04 +0000357
358 cipher_set_keycontext(cc, dat);
359}
360
361int
362packet_get_keyiv_len(int mode)
363{
364 CipherContext *cc;
365
366 if (mode == MODE_OUT)
Darren Tuckerf7288d72009-06-21 18:12:20 +1000367 cc = &active_state->send_context;
Ben Lindstromf6027d32002-03-22 01:42:04 +0000368 else
Darren Tuckerf7288d72009-06-21 18:12:20 +1000369 cc = &active_state->receive_context;
Ben Lindstromf6027d32002-03-22 01:42:04 +0000370
371 return (cipher_get_keyiv_len(cc));
372}
Damien Miller4f7becb2006-03-26 14:10:14 +1100373
Ben Lindstromf6027d32002-03-22 01:42:04 +0000374void
375packet_set_iv(int mode, u_char *dat)
376{
377 CipherContext *cc;
378
379 if (mode == MODE_OUT)
Darren Tuckerf7288d72009-06-21 18:12:20 +1000380 cc = &active_state->send_context;
Ben Lindstromf6027d32002-03-22 01:42:04 +0000381 else
Darren Tuckerf7288d72009-06-21 18:12:20 +1000382 cc = &active_state->receive_context;
Ben Lindstromf6027d32002-03-22 01:42:04 +0000383
384 cipher_set_keyiv(cc, dat);
385}
Damien Miller4f7becb2006-03-26 14:10:14 +1100386
Ben Lindstromf6027d32002-03-22 01:42:04 +0000387int
Damien Miller2b92d322003-06-11 22:05:06 +1000388packet_get_ssh1_cipher(void)
Ben Lindstromf6027d32002-03-22 01:42:04 +0000389{
Darren Tuckerf7288d72009-06-21 18:12:20 +1000390 return (cipher_get_number(active_state->receive_context.cipher));
Ben Lindstromf6027d32002-03-22 01:42:04 +0000391}
392
Damien Millera5539d22003-04-09 20:50:06 +1000393void
Damien Miller7a221a12010-11-20 15:14:29 +1100394packet_get_state(int mode, u_int32_t *seqnr, u_int64_t *blocks,
395 u_int32_t *packets, u_int64_t *bytes)
Ben Lindstromf6027d32002-03-22 01:42:04 +0000396{
Damien Millera5539d22003-04-09 20:50:06 +1000397 struct packet_state *state;
398
Darren Tuckerf7288d72009-06-21 18:12:20 +1000399 state = (mode == MODE_IN) ?
400 &active_state->p_read : &active_state->p_send;
Damien Millerb61f3fc2008-07-11 17:36:48 +1000401 if (seqnr)
402 *seqnr = state->seqnr;
403 if (blocks)
404 *blocks = state->blocks;
405 if (packets)
406 *packets = state->packets;
407 if (bytes)
408 *bytes = state->bytes;
Ben Lindstromf6027d32002-03-22 01:42:04 +0000409}
410
411void
Damien Millerb61f3fc2008-07-11 17:36:48 +1000412packet_set_state(int mode, u_int32_t seqnr, u_int64_t blocks, u_int32_t packets,
413 u_int64_t bytes)
Ben Lindstromf6027d32002-03-22 01:42:04 +0000414{
Damien Millera5539d22003-04-09 20:50:06 +1000415 struct packet_state *state;
416
Darren Tuckerf7288d72009-06-21 18:12:20 +1000417 state = (mode == MODE_IN) ?
418 &active_state->p_read : &active_state->p_send;
Damien Millera5539d22003-04-09 20:50:06 +1000419 state->seqnr = seqnr;
420 state->blocks = blocks;
421 state->packets = packets;
Damien Millerb61f3fc2008-07-11 17:36:48 +1000422 state->bytes = bytes;
Ben Lindstromf6027d32002-03-22 01:42:04 +0000423}
424
Damien Millerd2ac5d72011-05-15 08:43:13 +1000425static int
426packet_connection_af(void)
Damien Miller34132e52000-01-14 15:45:46 +1100427{
428 struct sockaddr_storage to;
Damien Miller6fe375d2000-01-23 09:38:00 +1100429 socklen_t tolen = sizeof(to);
Damien Miller34132e52000-01-14 15:45:46 +1100430
431 memset(&to, 0, sizeof(to));
Darren Tuckerf7288d72009-06-21 18:12:20 +1000432 if (getsockname(active_state->connection_out, (struct sockaddr *)&to,
433 &tolen) < 0)
Damien Miller34132e52000-01-14 15:45:46 +1100434 return 0;
Damien Milleraa100c52002-04-26 16:54:34 +1000435#ifdef IPV4_IN_IPV6
Damien Millera8e06ce2003-11-21 23:48:55 +1100436 if (to.ss_family == AF_INET6 &&
Damien Milleraa100c52002-04-26 16:54:34 +1000437 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&to)->sin6_addr))
Damien Millerd2ac5d72011-05-15 08:43:13 +1000438 return AF_INET;
Damien Milleraa100c52002-04-26 16:54:34 +1000439#endif
Damien Millerd2ac5d72011-05-15 08:43:13 +1000440 return to.ss_family;
Damien Miller34132e52000-01-14 15:45:46 +1100441}
442
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000443/* Sets the connection into non-blocking mode. */
444
445void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000446packet_set_nonblocking(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000447{
Damien Miller95def091999-11-25 00:26:21 +1100448 /* Set the socket into non-blocking mode. */
Darren Tuckerf7288d72009-06-21 18:12:20 +1000449 set_nonblock(active_state->connection_in);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000450
Darren Tuckerf7288d72009-06-21 18:12:20 +1000451 if (active_state->connection_out != active_state->connection_in)
452 set_nonblock(active_state->connection_out);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000453}
454
455/* Returns the socket used for reading. */
456
457int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000458packet_get_connection_in(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000459{
Darren Tuckerf7288d72009-06-21 18:12:20 +1000460 return active_state->connection_in;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000461}
462
463/* Returns the descriptor used for writing. */
464
465int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000466packet_get_connection_out(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000467{
Darren Tuckerf7288d72009-06-21 18:12:20 +1000468 return active_state->connection_out;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000469}
470
471/* Closes the connection and clears and frees internal data structures. */
472
473void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000474packet_close(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000475{
Darren Tuckerf7288d72009-06-21 18:12:20 +1000476 if (!active_state->initialized)
Damien Miller95def091999-11-25 00:26:21 +1100477 return;
Darren Tuckerf7288d72009-06-21 18:12:20 +1000478 active_state->initialized = 0;
479 if (active_state->connection_in == active_state->connection_out) {
480 shutdown(active_state->connection_out, SHUT_RDWR);
481 close(active_state->connection_out);
Damien Miller95def091999-11-25 00:26:21 +1100482 } else {
Darren Tuckerf7288d72009-06-21 18:12:20 +1000483 close(active_state->connection_in);
484 close(active_state->connection_out);
Damien Miller95def091999-11-25 00:26:21 +1100485 }
Darren Tuckerf7288d72009-06-21 18:12:20 +1000486 buffer_free(&active_state->input);
487 buffer_free(&active_state->output);
488 buffer_free(&active_state->outgoing_packet);
489 buffer_free(&active_state->incoming_packet);
490 if (active_state->compression_buffer_ready) {
491 buffer_free(&active_state->compression_buffer);
Damien Miller95def091999-11-25 00:26:21 +1100492 buffer_compress_uninit();
493 }
Darren Tuckerf7288d72009-06-21 18:12:20 +1000494 cipher_cleanup(&active_state->send_context);
495 cipher_cleanup(&active_state->receive_context);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000496}
497
498/* Sets remote side protocol flags. */
499
500void
Ben Lindstrom46c16222000-12-22 01:43:59 +0000501packet_set_protocol_flags(u_int protocol_flags)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000502{
Darren Tuckerf7288d72009-06-21 18:12:20 +1000503 active_state->remote_protocol_flags = protocol_flags;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000504}
505
506/* Returns the remote protocol flags set earlier by the above function. */
507
Ben Lindstrom46c16222000-12-22 01:43:59 +0000508u_int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000509packet_get_protocol_flags(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000510{
Darren Tuckerf7288d72009-06-21 18:12:20 +1000511 return active_state->remote_protocol_flags;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000512}
513
Damien Miller5428f641999-11-25 11:54:57 +1100514/*
515 * Starts packet compression from the next packet on in both directions.
516 * Level is compression level 1 (fastest) - 9 (slow, best) as in gzip.
517 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000518
Ben Lindstrombba81212001-06-25 05:01:22 +0000519static void
520packet_init_compression(void)
Ben Lindstromfb50cdf2001-04-05 23:20:46 +0000521{
Darren Tuckerf7288d72009-06-21 18:12:20 +1000522 if (active_state->compression_buffer_ready == 1)
Ben Lindstromfb50cdf2001-04-05 23:20:46 +0000523 return;
Darren Tuckerf7288d72009-06-21 18:12:20 +1000524 active_state->compression_buffer_ready = 1;
525 buffer_init(&active_state->compression_buffer);
Ben Lindstromfb50cdf2001-04-05 23:20:46 +0000526}
527
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000528void
529packet_start_compression(int level)
530{
Darren Tuckerf7288d72009-06-21 18:12:20 +1000531 if (active_state->packet_compression && !compat20)
Damien Miller95def091999-11-25 00:26:21 +1100532 fatal("Compression already enabled.");
Darren Tuckerf7288d72009-06-21 18:12:20 +1000533 active_state->packet_compression = 1;
Ben Lindstromfb50cdf2001-04-05 23:20:46 +0000534 packet_init_compression();
535 buffer_compress_init_send(level);
536 buffer_compress_init_recv();
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000537}
538
Damien Miller5428f641999-11-25 11:54:57 +1100539/*
Damien Miller5428f641999-11-25 11:54:57 +1100540 * Causes any further packets to be encrypted using the given key. The same
541 * key is used for both sending and reception. However, both directions are
542 * encrypted independently of each other.
543 */
Ben Lindstrom402c6cc2002-06-21 00:43:42 +0000544
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000545void
Damien Miller7a221a12010-11-20 15:14:29 +1100546packet_set_encryption_key(const u_char *key, u_int keylen, int number)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000547{
Damien Miller874d77b2000-10-14 16:23:11 +1100548 Cipher *cipher = cipher_by_number(number);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000549
Damien Miller874d77b2000-10-14 16:23:11 +1100550 if (cipher == NULL)
551 fatal("packet_set_encryption_key: unknown cipher number %d", number);
Damien Miller33b13562000-04-04 14:38:59 +1000552 if (keylen < 20)
Damien Miller874d77b2000-10-14 16:23:11 +1100553 fatal("packet_set_encryption_key: keylen too small: %d", keylen);
Ben Lindstrom402c6cc2002-06-21 00:43:42 +0000554 if (keylen > SSH_SESSION_KEY_LENGTH)
555 fatal("packet_set_encryption_key: keylen too big: %d", keylen);
Darren Tuckerf7288d72009-06-21 18:12:20 +1000556 memcpy(active_state->ssh1_key, key, keylen);
557 active_state->ssh1_keylen = keylen;
558 cipher_init(&active_state->send_context, cipher, key, keylen, NULL,
559 0, CIPHER_ENCRYPT);
560 cipher_init(&active_state->receive_context, cipher, key, keylen, NULL,
561 0, CIPHER_DECRYPT);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000562}
563
Ben Lindstrom402c6cc2002-06-21 00:43:42 +0000564u_int
565packet_get_encryption_key(u_char *key)
566{
567 if (key == NULL)
Darren Tuckerf7288d72009-06-21 18:12:20 +1000568 return (active_state->ssh1_keylen);
569 memcpy(key, active_state->ssh1_key, active_state->ssh1_keylen);
570 return (active_state->ssh1_keylen);
Ben Lindstrom402c6cc2002-06-21 00:43:42 +0000571}
572
Ben Lindstrom80c6d772001-06-05 21:09:18 +0000573/* Start constructing a packet to send. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000574void
Ben Lindstrom80c6d772001-06-05 21:09:18 +0000575packet_start(u_char type)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000576{
Ben Lindstrom80c6d772001-06-05 21:09:18 +0000577 u_char buf[9];
578 int len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000579
Ben Lindstrom204e4882001-03-05 06:47:00 +0000580 DBG(debug("packet_start[%d]", type));
Ben Lindstrom80c6d772001-06-05 21:09:18 +0000581 len = compat20 ? 6 : 9;
582 memset(buf, 0, len - 1);
583 buf[len - 1] = type;
Darren Tuckerf7288d72009-06-21 18:12:20 +1000584 buffer_clear(&active_state->outgoing_packet);
585 buffer_append(&active_state->outgoing_packet, buf, len);
Damien Miller33b13562000-04-04 14:38:59 +1000586}
587
Ben Lindstrom80c6d772001-06-05 21:09:18 +0000588/* Append payload. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000589void
590packet_put_char(int value)
591{
Damien Miller95def091999-11-25 00:26:21 +1100592 char ch = value;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000593
Darren Tuckerf7288d72009-06-21 18:12:20 +1000594 buffer_append(&active_state->outgoing_packet, &ch, 1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000595}
Damien Miller4f7becb2006-03-26 14:10:14 +1100596
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000597void
Ben Lindstrom46c16222000-12-22 01:43:59 +0000598packet_put_int(u_int value)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000599{
Darren Tuckerf7288d72009-06-21 18:12:20 +1000600 buffer_put_int(&active_state->outgoing_packet, value);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000601}
Damien Miller4f7becb2006-03-26 14:10:14 +1100602
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000603void
Darren Tucker761c3892009-06-21 18:16:26 +1000604packet_put_int64(u_int64_t value)
605{
606 buffer_put_int64(&active_state->outgoing_packet, value);
607}
608
609void
Damien Miller5a6b4fe2001-12-21 14:56:54 +1100610packet_put_string(const void *buf, u_int len)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000611{
Darren Tuckerf7288d72009-06-21 18:12:20 +1000612 buffer_put_string(&active_state->outgoing_packet, buf, len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000613}
Damien Miller4f7becb2006-03-26 14:10:14 +1100614
Damien Miller33b13562000-04-04 14:38:59 +1000615void
616packet_put_cstring(const char *str)
617{
Darren Tuckerf7288d72009-06-21 18:12:20 +1000618 buffer_put_cstring(&active_state->outgoing_packet, str);
Damien Miller33b13562000-04-04 14:38:59 +1000619}
Damien Miller4f7becb2006-03-26 14:10:14 +1100620
Damien Miller33b13562000-04-04 14:38:59 +1000621void
Damien Miller5a6b4fe2001-12-21 14:56:54 +1100622packet_put_raw(const void *buf, u_int len)
Damien Miller33b13562000-04-04 14:38:59 +1000623{
Darren Tuckerf7288d72009-06-21 18:12:20 +1000624 buffer_append(&active_state->outgoing_packet, buf, len);
Damien Miller33b13562000-04-04 14:38:59 +1000625}
Damien Miller4f7becb2006-03-26 14:10:14 +1100626
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000627void
Damien Miller95def091999-11-25 00:26:21 +1100628packet_put_bignum(BIGNUM * value)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000629{
Darren Tuckerf7288d72009-06-21 18:12:20 +1000630 buffer_put_bignum(&active_state->outgoing_packet, value);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000631}
Damien Miller4f7becb2006-03-26 14:10:14 +1100632
Damien Miller33b13562000-04-04 14:38:59 +1000633void
634packet_put_bignum2(BIGNUM * value)
635{
Darren Tuckerf7288d72009-06-21 18:12:20 +1000636 buffer_put_bignum2(&active_state->outgoing_packet, value);
Damien Miller33b13562000-04-04 14:38:59 +1000637}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000638
Damien Miller6af914a2010-09-10 11:39:26 +1000639#ifdef OPENSSL_HAS_ECC
Damien Millereb8b60e2010-08-31 22:41:14 +1000640void
641packet_put_ecpoint(const EC_GROUP *curve, const EC_POINT *point)
642{
643 buffer_put_ecpoint(&active_state->outgoing_packet, curve, point);
644}
Damien Miller6af914a2010-09-10 11:39:26 +1000645#endif
Damien Millereb8b60e2010-08-31 22:41:14 +1000646
Damien Miller5428f641999-11-25 11:54:57 +1100647/*
648 * Finalizes and sends the packet. If the encryption key has been set,
649 * encrypts the packet before sending.
650 */
Damien Miller95def091999-11-25 00:26:21 +1100651
Ben Lindstrombba81212001-06-25 05:01:22 +0000652static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000653packet_send1(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000654{
Ben Lindstrom4a7714a2002-02-26 18:04:38 +0000655 u_char buf[8], *cp;
Damien Miller95def091999-11-25 00:26:21 +1100656 int i, padding, len;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000657 u_int checksum;
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000658 u_int32_t rnd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000659
Damien Miller5428f641999-11-25 11:54:57 +1100660 /*
661 * If using packet compression, compress the payload of the outgoing
662 * packet.
663 */
Darren Tuckerf7288d72009-06-21 18:12:20 +1000664 if (active_state->packet_compression) {
665 buffer_clear(&active_state->compression_buffer);
Damien Miller95def091999-11-25 00:26:21 +1100666 /* Skip padding. */
Darren Tuckerf7288d72009-06-21 18:12:20 +1000667 buffer_consume(&active_state->outgoing_packet, 8);
Damien Miller95def091999-11-25 00:26:21 +1100668 /* padding */
Darren Tuckerf7288d72009-06-21 18:12:20 +1000669 buffer_append(&active_state->compression_buffer,
670 "\0\0\0\0\0\0\0\0", 8);
671 buffer_compress(&active_state->outgoing_packet,
672 &active_state->compression_buffer);
673 buffer_clear(&active_state->outgoing_packet);
674 buffer_append(&active_state->outgoing_packet,
675 buffer_ptr(&active_state->compression_buffer),
676 buffer_len(&active_state->compression_buffer));
Damien Miller95def091999-11-25 00:26:21 +1100677 }
678 /* Compute packet length without padding (add checksum, remove padding). */
Darren Tuckerf7288d72009-06-21 18:12:20 +1000679 len = buffer_len(&active_state->outgoing_packet) + 4 - 8;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000680
Damien Millere247cc42000-05-07 12:03:14 +1000681 /* Insert padding. Initialized to zero in packet_start1() */
Damien Miller95def091999-11-25 00:26:21 +1100682 padding = 8 - len % 8;
Darren Tuckerf7288d72009-06-21 18:12:20 +1000683 if (!active_state->send_context.plaintext) {
684 cp = buffer_ptr(&active_state->outgoing_packet);
Damien Miller95def091999-11-25 00:26:21 +1100685 for (i = 0; i < padding; i++) {
686 if (i % 4 == 0)
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000687 rnd = arc4random();
688 cp[7 - i] = rnd & 0xff;
689 rnd >>= 8;
Damien Miller95def091999-11-25 00:26:21 +1100690 }
691 }
Darren Tuckerf7288d72009-06-21 18:12:20 +1000692 buffer_consume(&active_state->outgoing_packet, 8 - padding);
Damien Miller95def091999-11-25 00:26:21 +1100693
694 /* Add check bytes. */
Darren Tuckerf7288d72009-06-21 18:12:20 +1000695 checksum = ssh_crc32(buffer_ptr(&active_state->outgoing_packet),
696 buffer_len(&active_state->outgoing_packet));
Damien Miller3f941882006-03-31 23:13:02 +1100697 put_u32(buf, checksum);
Darren Tuckerf7288d72009-06-21 18:12:20 +1000698 buffer_append(&active_state->outgoing_packet, buf, 4);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000699
700#ifdef PACKET_DEBUG
Damien Miller95def091999-11-25 00:26:21 +1100701 fprintf(stderr, "packet_send plain: ");
Darren Tuckerf7288d72009-06-21 18:12:20 +1000702 buffer_dump(&active_state->outgoing_packet);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000703#endif
704
Damien Miller95def091999-11-25 00:26:21 +1100705 /* Append to output. */
Damien Miller3f941882006-03-31 23:13:02 +1100706 put_u32(buf, len);
Darren Tuckerf7288d72009-06-21 18:12:20 +1000707 buffer_append(&active_state->output, buf, 4);
708 cp = buffer_append_space(&active_state->output,
709 buffer_len(&active_state->outgoing_packet));
710 cipher_crypt(&active_state->send_context, cp,
711 buffer_ptr(&active_state->outgoing_packet),
712 buffer_len(&active_state->outgoing_packet));
Damien Miller95def091999-11-25 00:26:21 +1100713
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000714#ifdef PACKET_DEBUG
Damien Miller95def091999-11-25 00:26:21 +1100715 fprintf(stderr, "encrypted: ");
Darren Tuckerf7288d72009-06-21 18:12:20 +1000716 buffer_dump(&active_state->output);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000717#endif
Darren Tuckerf7288d72009-06-21 18:12:20 +1000718 active_state->p_send.packets++;
719 active_state->p_send.bytes += len +
720 buffer_len(&active_state->outgoing_packet);
721 buffer_clear(&active_state->outgoing_packet);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000722
Damien Miller5428f641999-11-25 11:54:57 +1100723 /*
Damien Miller788f2122005-11-05 15:14:59 +1100724 * Note that the packet is now only buffered in output. It won't be
Damien Miller5428f641999-11-25 11:54:57 +1100725 * actually sent until packet_write_wait or packet_write_poll is
726 * called.
727 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000728}
729
Ben Lindstromf6027d32002-03-22 01:42:04 +0000730void
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000731set_newkeys(int mode)
732{
733 Enc *enc;
734 Mac *mac;
735 Comp *comp;
736 CipherContext *cc;
Damien Millera5539d22003-04-09 20:50:06 +1000737 u_int64_t *max_blocks;
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000738 int crypt_type;
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000739
Ben Lindstrom064496f2002-12-23 02:04:22 +0000740 debug2("set_newkeys: mode %d", mode);
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000741
Damien Miller963f6b22002-02-19 15:21:23 +1100742 if (mode == MODE_OUT) {
Darren Tuckerf7288d72009-06-21 18:12:20 +1000743 cc = &active_state->send_context;
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000744 crypt_type = CIPHER_ENCRYPT;
Darren Tuckerf7288d72009-06-21 18:12:20 +1000745 active_state->p_send.packets = active_state->p_send.blocks = 0;
746 max_blocks = &active_state->max_blocks_out;
Damien Miller963f6b22002-02-19 15:21:23 +1100747 } else {
Darren Tuckerf7288d72009-06-21 18:12:20 +1000748 cc = &active_state->receive_context;
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000749 crypt_type = CIPHER_DECRYPT;
Darren Tuckerf7288d72009-06-21 18:12:20 +1000750 active_state->p_read.packets = active_state->p_read.blocks = 0;
751 max_blocks = &active_state->max_blocks_in;
Damien Miller963f6b22002-02-19 15:21:23 +1100752 }
Darren Tuckerf7288d72009-06-21 18:12:20 +1000753 if (active_state->newkeys[mode] != NULL) {
Ben Lindstrom064496f2002-12-23 02:04:22 +0000754 debug("set_newkeys: rekeying");
Damien Miller963f6b22002-02-19 15:21:23 +1100755 cipher_cleanup(cc);
Darren Tuckerf7288d72009-06-21 18:12:20 +1000756 enc = &active_state->newkeys[mode]->enc;
757 mac = &active_state->newkeys[mode]->mac;
758 comp = &active_state->newkeys[mode]->comp;
Damien Millere45796f2007-06-11 14:01:42 +1000759 mac_clear(mac);
Ben Lindstrom5ba23b32001-04-05 02:05:21 +0000760 xfree(enc->name);
761 xfree(enc->iv);
762 xfree(enc->key);
763 xfree(mac->name);
764 xfree(mac->key);
765 xfree(comp->name);
Darren Tuckerf7288d72009-06-21 18:12:20 +1000766 xfree(active_state->newkeys[mode]);
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000767 }
Darren Tuckerf7288d72009-06-21 18:12:20 +1000768 active_state->newkeys[mode] = kex_get_newkeys(mode);
769 if (active_state->newkeys[mode] == NULL)
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000770 fatal("newkeys: no keys for mode %d", mode);
Darren Tuckerf7288d72009-06-21 18:12:20 +1000771 enc = &active_state->newkeys[mode]->enc;
772 mac = &active_state->newkeys[mode]->mac;
773 comp = &active_state->newkeys[mode]->comp;
Damien Millere45796f2007-06-11 14:01:42 +1000774 if (mac_init(mac) == 0)
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000775 mac->enabled = 1;
776 DBG(debug("cipher_init_context: %d", mode));
Damien Miller963f6b22002-02-19 15:21:23 +1100777 cipher_init(cc, enc->cipher, enc->key, enc->key_len,
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000778 enc->iv, enc->block_size, crypt_type);
Ben Lindstromf6027d32002-03-22 01:42:04 +0000779 /* Deleting the keys does not gain extra security */
780 /* memset(enc->iv, 0, enc->block_size);
Darren Tucker5f3d5be2007-06-05 18:30:18 +1000781 memset(enc->key, 0, enc->key_len);
782 memset(mac->key, 0, mac->key_len); */
Damien Miller9786e6e2005-07-26 21:54:56 +1000783 if ((comp->type == COMP_ZLIB ||
Darren Tuckerf7288d72009-06-21 18:12:20 +1000784 (comp->type == COMP_DELAYED &&
785 active_state->after_authentication)) && comp->enabled == 0) {
Ben Lindstromfb50cdf2001-04-05 23:20:46 +0000786 packet_init_compression();
787 if (mode == MODE_OUT)
788 buffer_compress_init_send(6);
789 else
790 buffer_compress_init_recv();
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000791 comp->enabled = 1;
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000792 }
Darren Tucker81a0b372003-07-14 17:31:06 +1000793 /*
794 * The 2^(blocksize*2) limit is too expensive for 3DES,
795 * blowfish, etc, so enforce a 1GB limit for small blocksizes.
796 */
797 if (enc->block_size >= 16)
798 *max_blocks = (u_int64_t)1 << (enc->block_size*2);
799 else
800 *max_blocks = ((u_int64_t)1 << 30) / enc->block_size;
Darren Tuckerf7288d72009-06-21 18:12:20 +1000801 if (active_state->rekey_limit)
802 *max_blocks = MIN(*max_blocks,
803 active_state->rekey_limit / enc->block_size);
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000804}
805
Damien Miller5428f641999-11-25 11:54:57 +1100806/*
Damien Miller9786e6e2005-07-26 21:54:56 +1000807 * Delayed compression for SSH2 is enabled after authentication:
Darren Tuckerf676c572006-08-05 18:51:08 +1000808 * This happens on the server side after a SSH2_MSG_USERAUTH_SUCCESS is sent,
Damien Miller9786e6e2005-07-26 21:54:56 +1000809 * and on the client side after a SSH2_MSG_USERAUTH_SUCCESS is received.
810 */
811static void
812packet_enable_delayed_compress(void)
813{
814 Comp *comp = NULL;
815 int mode;
816
817 /*
818 * Remember that we are past the authentication step, so rekeying
819 * with COMP_DELAYED will turn on compression immediately.
820 */
Darren Tuckerf7288d72009-06-21 18:12:20 +1000821 active_state->after_authentication = 1;
Damien Miller9786e6e2005-07-26 21:54:56 +1000822 for (mode = 0; mode < MODE_MAX; mode++) {
Darren Tucker4aa665b2006-09-21 13:00:25 +1000823 /* protocol error: USERAUTH_SUCCESS received before NEWKEYS */
Darren Tuckerf7288d72009-06-21 18:12:20 +1000824 if (active_state->newkeys[mode] == NULL)
Darren Tucker4aa665b2006-09-21 13:00:25 +1000825 continue;
Darren Tuckerf7288d72009-06-21 18:12:20 +1000826 comp = &active_state->newkeys[mode]->comp;
Damien Miller9786e6e2005-07-26 21:54:56 +1000827 if (comp && !comp->enabled && comp->type == COMP_DELAYED) {
Damien Millerb5c01252005-08-12 22:10:28 +1000828 packet_init_compression();
Damien Miller9786e6e2005-07-26 21:54:56 +1000829 if (mode == MODE_OUT)
830 buffer_compress_init_send(6);
831 else
832 buffer_compress_init_recv();
833 comp->enabled = 1;
834 }
835 }
836}
837
838/*
Damien Miller33b13562000-04-04 14:38:59 +1000839 * Finalize packet in SSH2 format (compress, mac, encrypt, enqueue)
840 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000841static void
Damien Millera5539d22003-04-09 20:50:06 +1000842packet_send2_wrapped(void)
Damien Miller33b13562000-04-04 14:38:59 +1000843{
Ben Lindstrom4a7714a2002-02-26 18:04:38 +0000844 u_char type, *cp, *macbuf = NULL;
Damien Miller9f643902001-11-12 11:02:52 +1100845 u_char padlen, pad;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000846 u_int packet_length = 0;
Damien Miller9f643902001-11-12 11:02:52 +1100847 u_int i, len;
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000848 u_int32_t rnd = 0;
Damien Miller33b13562000-04-04 14:38:59 +1000849 Enc *enc = NULL;
850 Mac *mac = NULL;
851 Comp *comp = NULL;
852 int block_size;
853
Darren Tuckerf7288d72009-06-21 18:12:20 +1000854 if (active_state->newkeys[MODE_OUT] != NULL) {
855 enc = &active_state->newkeys[MODE_OUT]->enc;
856 mac = &active_state->newkeys[MODE_OUT]->mac;
857 comp = &active_state->newkeys[MODE_OUT]->comp;
Damien Miller33b13562000-04-04 14:38:59 +1000858 }
Damien Miller963f6b22002-02-19 15:21:23 +1100859 block_size = enc ? enc->block_size : 8;
Damien Miller33b13562000-04-04 14:38:59 +1000860
Darren Tuckerf7288d72009-06-21 18:12:20 +1000861 cp = buffer_ptr(&active_state->outgoing_packet);
Ben Lindstrom4a7714a2002-02-26 18:04:38 +0000862 type = cp[5];
Damien Miller33b13562000-04-04 14:38:59 +1000863
864#ifdef PACKET_DEBUG
865 fprintf(stderr, "plain: ");
Darren Tuckerf7288d72009-06-21 18:12:20 +1000866 buffer_dump(&active_state->outgoing_packet);
Damien Miller33b13562000-04-04 14:38:59 +1000867#endif
868
869 if (comp && comp->enabled) {
Darren Tuckerf7288d72009-06-21 18:12:20 +1000870 len = buffer_len(&active_state->outgoing_packet);
Damien Miller33b13562000-04-04 14:38:59 +1000871 /* skip header, compress only payload */
Darren Tuckerf7288d72009-06-21 18:12:20 +1000872 buffer_consume(&active_state->outgoing_packet, 5);
873 buffer_clear(&active_state->compression_buffer);
874 buffer_compress(&active_state->outgoing_packet,
875 &active_state->compression_buffer);
876 buffer_clear(&active_state->outgoing_packet);
877 buffer_append(&active_state->outgoing_packet, "\0\0\0\0\0", 5);
878 buffer_append(&active_state->outgoing_packet,
879 buffer_ptr(&active_state->compression_buffer),
880 buffer_len(&active_state->compression_buffer));
Damien Miller33b13562000-04-04 14:38:59 +1000881 DBG(debug("compression: raw %d compressed %d", len,
Darren Tuckerf7288d72009-06-21 18:12:20 +1000882 buffer_len(&active_state->outgoing_packet)));
Damien Miller33b13562000-04-04 14:38:59 +1000883 }
884
885 /* sizeof (packet_len + pad_len + payload) */
Darren Tuckerf7288d72009-06-21 18:12:20 +1000886 len = buffer_len(&active_state->outgoing_packet);
Damien Miller33b13562000-04-04 14:38:59 +1000887
888 /*
889 * calc size of padding, alloc space, get random data,
890 * minimum padding is 4 bytes
891 */
892 padlen = block_size - (len % block_size);
893 if (padlen < 4)
894 padlen += block_size;
Darren Tuckerf7288d72009-06-21 18:12:20 +1000895 if (active_state->extra_pad) {
Damien Miller9f643902001-11-12 11:02:52 +1100896 /* will wrap if extra_pad+padlen > 255 */
Darren Tuckerf7288d72009-06-21 18:12:20 +1000897 active_state->extra_pad =
898 roundup(active_state->extra_pad, block_size);
899 pad = active_state->extra_pad -
900 ((len + padlen) % active_state->extra_pad);
Ben Lindstrom8b08d812002-03-26 02:09:41 +0000901 debug3("packet_send2: adding %d (len %d padlen %d extra_pad %d)",
Darren Tuckerf7288d72009-06-21 18:12:20 +1000902 pad, len, padlen, active_state->extra_pad);
Damien Miller9f643902001-11-12 11:02:52 +1100903 padlen += pad;
Darren Tuckerf7288d72009-06-21 18:12:20 +1000904 active_state->extra_pad = 0;
Damien Miller9f643902001-11-12 11:02:52 +1100905 }
Darren Tuckerf7288d72009-06-21 18:12:20 +1000906 cp = buffer_append_space(&active_state->outgoing_packet, padlen);
907 if (enc && !active_state->send_context.plaintext) {
Damien Millere247cc42000-05-07 12:03:14 +1000908 /* random padding */
Damien Miller33b13562000-04-04 14:38:59 +1000909 for (i = 0; i < padlen; i++) {
910 if (i % 4 == 0)
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000911 rnd = arc4random();
912 cp[i] = rnd & 0xff;
913 rnd >>= 8;
Damien Miller33b13562000-04-04 14:38:59 +1000914 }
Damien Millere247cc42000-05-07 12:03:14 +1000915 } else {
916 /* clear padding */
917 memset(cp, 0, padlen);
Damien Miller33b13562000-04-04 14:38:59 +1000918 }
919 /* packet_length includes payload, padding and padding length field */
Darren Tuckerf7288d72009-06-21 18:12:20 +1000920 packet_length = buffer_len(&active_state->outgoing_packet) - 4;
921 cp = buffer_ptr(&active_state->outgoing_packet);
Damien Miller3f941882006-03-31 23:13:02 +1100922 put_u32(cp, packet_length);
Ben Lindstrom4a7714a2002-02-26 18:04:38 +0000923 cp[4] = padlen;
Damien Miller33b13562000-04-04 14:38:59 +1000924 DBG(debug("send: len %d (includes padlen %d)", packet_length+4, padlen));
925
926 /* compute MAC over seqnr and packet(length fields, payload, padding) */
927 if (mac && mac->enabled) {
Darren Tuckerf7288d72009-06-21 18:12:20 +1000928 macbuf = mac_compute(mac, active_state->p_send.seqnr,
929 buffer_ptr(&active_state->outgoing_packet),
930 buffer_len(&active_state->outgoing_packet));
931 DBG(debug("done calc MAC out #%d", active_state->p_send.seqnr));
Damien Miller33b13562000-04-04 14:38:59 +1000932 }
933 /* encrypt packet and append to output buffer. */
Darren Tuckerf7288d72009-06-21 18:12:20 +1000934 cp = buffer_append_space(&active_state->output,
935 buffer_len(&active_state->outgoing_packet));
936 cipher_crypt(&active_state->send_context, cp,
937 buffer_ptr(&active_state->outgoing_packet),
938 buffer_len(&active_state->outgoing_packet));
Damien Miller33b13562000-04-04 14:38:59 +1000939 /* append unencrypted MAC */
940 if (mac && mac->enabled)
Darren Tuckerf7288d72009-06-21 18:12:20 +1000941 buffer_append(&active_state->output, macbuf, mac->mac_len);
Damien Miller33b13562000-04-04 14:38:59 +1000942#ifdef PACKET_DEBUG
943 fprintf(stderr, "encrypted: ");
Darren Tuckerf7288d72009-06-21 18:12:20 +1000944 buffer_dump(&active_state->output);
Damien Miller33b13562000-04-04 14:38:59 +1000945#endif
Damien Miller4af51302000-04-16 11:18:38 +1000946 /* increment sequence number for outgoing packets */
Darren Tuckerf7288d72009-06-21 18:12:20 +1000947 if (++active_state->p_send.seqnr == 0)
Damien Miller996acd22003-04-09 20:59:48 +1000948 logit("outgoing seqnr wraps around");
Darren Tuckerf7288d72009-06-21 18:12:20 +1000949 if (++active_state->p_send.packets == 0)
Damien Millera5539d22003-04-09 20:50:06 +1000950 if (!(datafellows & SSH_BUG_NOREKEY))
951 fatal("XXX too many packets with same key");
Darren Tuckerf7288d72009-06-21 18:12:20 +1000952 active_state->p_send.blocks += (packet_length + 4) / block_size;
953 active_state->p_send.bytes += packet_length + 4;
954 buffer_clear(&active_state->outgoing_packet);
Damien Miller33b13562000-04-04 14:38:59 +1000955
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000956 if (type == SSH2_MSG_NEWKEYS)
957 set_newkeys(MODE_OUT);
Darren Tuckerf7288d72009-06-21 18:12:20 +1000958 else if (type == SSH2_MSG_USERAUTH_SUCCESS && active_state->server_side)
Damien Miller9786e6e2005-07-26 21:54:56 +1000959 packet_enable_delayed_compress();
Damien Miller33b13562000-04-04 14:38:59 +1000960}
961
Damien Millera5539d22003-04-09 20:50:06 +1000962static void
963packet_send2(void)
964{
Damien Millera5539d22003-04-09 20:50:06 +1000965 struct packet *p;
966 u_char type, *cp;
967
Darren Tuckerf7288d72009-06-21 18:12:20 +1000968 cp = buffer_ptr(&active_state->outgoing_packet);
Damien Millera5539d22003-04-09 20:50:06 +1000969 type = cp[5];
970
971 /* during rekeying we can only send key exchange messages */
Darren Tucker7b935c72009-06-21 18:59:36 +1000972 if (active_state->rekeying) {
Damien Miller1de2cfe2012-02-11 08:18:43 +1100973 if ((type < SSH2_MSG_TRANSPORT_MIN) ||
974 (type > SSH2_MSG_TRANSPORT_MAX) ||
975 (type == SSH2_MSG_SERVICE_REQUEST) ||
976 (type == SSH2_MSG_SERVICE_ACCEPT)) {
Damien Millera5539d22003-04-09 20:50:06 +1000977 debug("enqueue packet: %u", type);
978 p = xmalloc(sizeof(*p));
979 p->type = type;
Darren Tuckerf7288d72009-06-21 18:12:20 +1000980 memcpy(&p->payload, &active_state->outgoing_packet,
981 sizeof(Buffer));
982 buffer_init(&active_state->outgoing_packet);
983 TAILQ_INSERT_TAIL(&active_state->outgoing, p, next);
Damien Millera5539d22003-04-09 20:50:06 +1000984 return;
985 }
986 }
987
988 /* rekeying starts with sending KEXINIT */
989 if (type == SSH2_MSG_KEXINIT)
Darren Tucker7b935c72009-06-21 18:59:36 +1000990 active_state->rekeying = 1;
Damien Millera5539d22003-04-09 20:50:06 +1000991
992 packet_send2_wrapped();
993
994 /* after a NEWKEYS message we can send the complete queue */
995 if (type == SSH2_MSG_NEWKEYS) {
Darren Tucker7b935c72009-06-21 18:59:36 +1000996 active_state->rekeying = 0;
Darren Tuckerf7288d72009-06-21 18:12:20 +1000997 while ((p = TAILQ_FIRST(&active_state->outgoing))) {
Damien Millera5539d22003-04-09 20:50:06 +1000998 type = p->type;
999 debug("dequeue packet: %u", type);
Darren Tuckerf7288d72009-06-21 18:12:20 +10001000 buffer_free(&active_state->outgoing_packet);
1001 memcpy(&active_state->outgoing_packet, &p->payload,
Damien Millera5539d22003-04-09 20:50:06 +10001002 sizeof(Buffer));
Darren Tuckerf7288d72009-06-21 18:12:20 +10001003 TAILQ_REMOVE(&active_state->outgoing, p, next);
Damien Millera5539d22003-04-09 20:50:06 +10001004 xfree(p);
1005 packet_send2_wrapped();
1006 }
1007 }
1008}
1009
Damien Miller33b13562000-04-04 14:38:59 +10001010void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00001011packet_send(void)
Damien Miller33b13562000-04-04 14:38:59 +10001012{
Ben Lindstrom80c6d772001-06-05 21:09:18 +00001013 if (compat20)
Damien Miller33b13562000-04-04 14:38:59 +10001014 packet_send2();
1015 else
1016 packet_send1();
1017 DBG(debug("packet_send done"));
1018}
1019
Damien Miller33b13562000-04-04 14:38:59 +10001020/*
Damien Miller5428f641999-11-25 11:54:57 +11001021 * Waits until a packet has been received, and returns its type. Note that
1022 * no other data is processed until this returns, so this function should not
1023 * be used during the interactive session.
1024 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001025
1026int
Damien Millerdff50992002-01-22 23:16:32 +11001027packet_read_seqnr(u_int32_t *seqnr_p)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001028{
Darren Tuckerc5564e12009-06-21 18:53:53 +10001029 int type, len, ret, ms_remain, cont;
Ben Lindstromcb978aa2001-03-05 07:07:49 +00001030 fd_set *setp;
Damien Miller95def091999-11-25 00:26:21 +11001031 char buf[8192];
Darren Tucker3fc464e2008-06-13 06:42:45 +10001032 struct timeval timeout, start, *timeoutp = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001033
Darren Tucker99bb7612008-06-13 22:02:50 +10001034 DBG(debug("packet_read()"));
1035
Darren Tuckerf7288d72009-06-21 18:12:20 +10001036 setp = (fd_set *)xcalloc(howmany(active_state->connection_in + 1,
1037 NFDBITS), sizeof(fd_mask));
Ben Lindstromcb978aa2001-03-05 07:07:49 +00001038
Damien Miller95def091999-11-25 00:26:21 +11001039 /* Since we are blocking, ensure that all written packets have been sent. */
1040 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001041
Damien Miller95def091999-11-25 00:26:21 +11001042 /* Stay in the loop until we have received a complete packet. */
1043 for (;;) {
1044 /* Try to read a packet from the buffer. */
Damien Millerdff50992002-01-22 23:16:32 +11001045 type = packet_read_poll_seqnr(seqnr_p);
Ben Lindstrom80c6d772001-06-05 21:09:18 +00001046 if (!compat20 && (
Damien Millere247cc42000-05-07 12:03:14 +10001047 type == SSH_SMSG_SUCCESS
Damien Miller95def091999-11-25 00:26:21 +11001048 || type == SSH_SMSG_FAILURE
1049 || type == SSH_CMSG_EOF
Damien Millere247cc42000-05-07 12:03:14 +10001050 || type == SSH_CMSG_EXIT_CONFIRMATION))
Damien Miller48b03fc2002-01-22 23:11:40 +11001051 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +11001052 /* If we got a packet, return it. */
Ben Lindstromcb978aa2001-03-05 07:07:49 +00001053 if (type != SSH_MSG_NONE) {
1054 xfree(setp);
Damien Miller95def091999-11-25 00:26:21 +11001055 return type;
Ben Lindstromcb978aa2001-03-05 07:07:49 +00001056 }
Damien Miller5428f641999-11-25 11:54:57 +11001057 /*
1058 * Otherwise, wait for some data to arrive, add it to the
1059 * buffer, and try again.
1060 */
Darren Tuckerf7288d72009-06-21 18:12:20 +10001061 memset(setp, 0, howmany(active_state->connection_in + 1,
1062 NFDBITS) * sizeof(fd_mask));
1063 FD_SET(active_state->connection_in, setp);
Damien Miller5428f641999-11-25 11:54:57 +11001064
Darren Tuckerf7288d72009-06-21 18:12:20 +10001065 if (active_state->packet_timeout_ms > 0) {
1066 ms_remain = active_state->packet_timeout_ms;
Darren Tucker3fc464e2008-06-13 06:42:45 +10001067 timeoutp = &timeout;
1068 }
Damien Miller95def091999-11-25 00:26:21 +11001069 /* Wait for some data to arrive. */
Darren Tucker3fc464e2008-06-13 06:42:45 +10001070 for (;;) {
Darren Tuckerf7288d72009-06-21 18:12:20 +10001071 if (active_state->packet_timeout_ms != -1) {
Darren Tucker3fc464e2008-06-13 06:42:45 +10001072 ms_to_timeval(&timeout, ms_remain);
1073 gettimeofday(&start, NULL);
1074 }
Darren Tuckerf7288d72009-06-21 18:12:20 +10001075 if ((ret = select(active_state->connection_in + 1, setp,
1076 NULL, NULL, timeoutp)) >= 0)
Darren Tucker3fc464e2008-06-13 06:42:45 +10001077 break;
Damien Millerea437422009-10-02 11:49:03 +10001078 if (errno != EAGAIN && errno != EINTR &&
1079 errno != EWOULDBLOCK)
Darren Tucker3fc464e2008-06-13 06:42:45 +10001080 break;
Darren Tuckerf7288d72009-06-21 18:12:20 +10001081 if (active_state->packet_timeout_ms == -1)
Darren Tucker3fc464e2008-06-13 06:42:45 +10001082 continue;
1083 ms_subtract_diff(&start, &ms_remain);
1084 if (ms_remain <= 0) {
1085 ret = 0;
1086 break;
1087 }
1088 }
1089 if (ret == 0) {
1090 logit("Connection to %.200s timed out while "
1091 "waiting to read", get_remote_ipaddr());
1092 cleanup_exit(255);
1093 }
Damien Miller95def091999-11-25 00:26:21 +11001094 /* Read data from the socket. */
Darren Tuckerc5564e12009-06-21 18:53:53 +10001095 do {
1096 cont = 0;
1097 len = roaming_read(active_state->connection_in, buf,
1098 sizeof(buf), &cont);
1099 } while (len == 0 && cont);
Damien Miller5e7c10e1999-12-16 13:18:04 +11001100 if (len == 0) {
Damien Miller996acd22003-04-09 20:59:48 +10001101 logit("Connection closed by %.200s", get_remote_ipaddr());
Darren Tucker3e33cec2003-10-02 16:12:36 +10001102 cleanup_exit(255);
Damien Miller5e7c10e1999-12-16 13:18:04 +11001103 }
Damien Miller95def091999-11-25 00:26:21 +11001104 if (len < 0)
1105 fatal("Read from socket failed: %.100s", strerror(errno));
1106 /* Append it to the buffer. */
1107 packet_process_incoming(buf, len);
1108 }
1109 /* NOTREACHED */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001110}
1111
Damien Miller278f9072001-12-21 15:00:19 +11001112int
Damien Millerdff50992002-01-22 23:16:32 +11001113packet_read(void)
Damien Miller278f9072001-12-21 15:00:19 +11001114{
Damien Millerdff50992002-01-22 23:16:32 +11001115 return packet_read_seqnr(NULL);
Damien Miller278f9072001-12-21 15:00:19 +11001116}
1117
Damien Miller5428f641999-11-25 11:54:57 +11001118/*
1119 * Waits until a packet has been received, verifies that its type matches
1120 * that given, and gives a fatal error and exits if there is a mismatch.
1121 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001122
1123void
Damien Millerdff50992002-01-22 23:16:32 +11001124packet_read_expect(int expected_type)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001125{
Damien Miller95def091999-11-25 00:26:21 +11001126 int type;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001127
Damien Millerdff50992002-01-22 23:16:32 +11001128 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +11001129 if (type != expected_type)
1130 packet_disconnect("Protocol error: expected packet type %d, got %d",
Damien Miller33b13562000-04-04 14:38:59 +10001131 expected_type, type);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001132}
1133
1134/* Checks if a full packet is available in the data received so far via
Damien Miller95def091999-11-25 00:26:21 +11001135 * packet_process_incoming. If so, reads the packet; otherwise returns
1136 * SSH_MSG_NONE. This does not wait for data from the connection.
1137 *
Damien Miller5ed3d572008-02-10 22:27:47 +11001138 * SSH_MSG_DISCONNECT is handled specially here. Also,
1139 * SSH_MSG_IGNORE messages are skipped by this function and are never returned
1140 * to higher levels.
Damien Miller95def091999-11-25 00:26:21 +11001141 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001142
Ben Lindstrombba81212001-06-25 05:01:22 +00001143static int
Damien Millerdff50992002-01-22 23:16:32 +11001144packet_read_poll1(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001145{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001146 u_int len, padded_len;
Ben Lindstrom4a7714a2002-02-26 18:04:38 +00001147 u_char *cp, type;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001148 u_int checksum, stored_checksum;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001149
Damien Miller95def091999-11-25 00:26:21 +11001150 /* Check if input size is less than minimum packet size. */
Darren Tuckerf7288d72009-06-21 18:12:20 +10001151 if (buffer_len(&active_state->input) < 4 + 8)
Damien Miller95def091999-11-25 00:26:21 +11001152 return SSH_MSG_NONE;
1153 /* Get length of incoming packet. */
Darren Tuckerf7288d72009-06-21 18:12:20 +10001154 cp = buffer_ptr(&active_state->input);
Damien Miller3f941882006-03-31 23:13:02 +11001155 len = get_u32(cp);
Damien Miller95def091999-11-25 00:26:21 +11001156 if (len < 1 + 2 + 2 || len > 256 * 1024)
Ben Lindstrom0cc2a472002-11-09 15:41:39 +00001157 packet_disconnect("Bad packet length %u.", len);
Damien Miller95def091999-11-25 00:26:21 +11001158 padded_len = (len + 8) & ~7;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001159
Damien Miller95def091999-11-25 00:26:21 +11001160 /* Check if the packet has been entirely received. */
Darren Tuckerf7288d72009-06-21 18:12:20 +10001161 if (buffer_len(&active_state->input) < 4 + padded_len)
Damien Miller95def091999-11-25 00:26:21 +11001162 return SSH_MSG_NONE;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001163
Damien Miller95def091999-11-25 00:26:21 +11001164 /* The entire packet is in buffer. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001165
Damien Miller95def091999-11-25 00:26:21 +11001166 /* Consume packet length. */
Darren Tuckerf7288d72009-06-21 18:12:20 +10001167 buffer_consume(&active_state->input, 4);
Damien Miller95def091999-11-25 00:26:21 +11001168
Ben Lindstrom80c6d772001-06-05 21:09:18 +00001169 /*
1170 * Cryptographic attack detector for ssh
1171 * (C)1998 CORE-SDI, Buenos Aires Argentina
1172 * Ariel Futoransky(futo@core-sdi.com)
1173 */
Darren Tuckerf7288d72009-06-21 18:12:20 +10001174 if (!active_state->receive_context.plaintext) {
1175 switch (detect_attack(buffer_ptr(&active_state->input),
1176 padded_len)) {
Damien Miller3c9c1fb2006-09-17 06:08:53 +10001177 case DEATTACK_DETECTED:
1178 packet_disconnect("crc32 compensation attack: "
1179 "network attack detected");
1180 case DEATTACK_DOS_DETECTED:
1181 packet_disconnect("deattack denial of "
1182 "service detected");
1183 }
1184 }
Ben Lindstrom80c6d772001-06-05 21:09:18 +00001185
1186 /* Decrypt data to incoming_packet. */
Darren Tuckerf7288d72009-06-21 18:12:20 +10001187 buffer_clear(&active_state->incoming_packet);
1188 cp = buffer_append_space(&active_state->incoming_packet, padded_len);
1189 cipher_crypt(&active_state->receive_context, cp,
1190 buffer_ptr(&active_state->input), padded_len);
Ben Lindstrom80c6d772001-06-05 21:09:18 +00001191
Darren Tuckerf7288d72009-06-21 18:12:20 +10001192 buffer_consume(&active_state->input, padded_len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001193
1194#ifdef PACKET_DEBUG
Damien Miller95def091999-11-25 00:26:21 +11001195 fprintf(stderr, "read_poll plain: ");
Darren Tuckerf7288d72009-06-21 18:12:20 +10001196 buffer_dump(&active_state->incoming_packet);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001197#endif
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001198
Damien Miller95def091999-11-25 00:26:21 +11001199 /* Compute packet checksum. */
Darren Tuckerf7288d72009-06-21 18:12:20 +10001200 checksum = ssh_crc32(buffer_ptr(&active_state->incoming_packet),
1201 buffer_len(&active_state->incoming_packet) - 4);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001202
Damien Miller95def091999-11-25 00:26:21 +11001203 /* Skip padding. */
Darren Tuckerf7288d72009-06-21 18:12:20 +10001204 buffer_consume(&active_state->incoming_packet, 8 - len % 8);
Damien Millerfd7c9111999-11-08 16:15:55 +11001205
Damien Miller95def091999-11-25 00:26:21 +11001206 /* Test check bytes. */
Darren Tuckerf7288d72009-06-21 18:12:20 +10001207 if (len != buffer_len(&active_state->incoming_packet))
Damien Miller278f9072001-12-21 15:00:19 +11001208 packet_disconnect("packet_read_poll1: len %d != buffer_len %d.",
Darren Tuckerf7288d72009-06-21 18:12:20 +10001209 len, buffer_len(&active_state->incoming_packet));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001210
Darren Tuckerf7288d72009-06-21 18:12:20 +10001211 cp = (u_char *)buffer_ptr(&active_state->incoming_packet) + len - 4;
Damien Miller3f941882006-03-31 23:13:02 +11001212 stored_checksum = get_u32(cp);
Damien Miller95def091999-11-25 00:26:21 +11001213 if (checksum != stored_checksum)
1214 packet_disconnect("Corrupted check bytes on input.");
Darren Tuckerf7288d72009-06-21 18:12:20 +10001215 buffer_consume_end(&active_state->incoming_packet, 4);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001216
Darren Tuckerf7288d72009-06-21 18:12:20 +10001217 if (active_state->packet_compression) {
1218 buffer_clear(&active_state->compression_buffer);
1219 buffer_uncompress(&active_state->incoming_packet,
1220 &active_state->compression_buffer);
1221 buffer_clear(&active_state->incoming_packet);
1222 buffer_append(&active_state->incoming_packet,
1223 buffer_ptr(&active_state->compression_buffer),
1224 buffer_len(&active_state->compression_buffer));
Damien Miller95def091999-11-25 00:26:21 +11001225 }
Darren Tuckerf7288d72009-06-21 18:12:20 +10001226 active_state->p_read.packets++;
1227 active_state->p_read.bytes += padded_len + 4;
1228 type = buffer_get_char(&active_state->incoming_packet);
Darren Tuckerb2694f02004-11-05 20:27:54 +11001229 if (type < SSH_MSG_MIN || type > SSH_MSG_MAX)
1230 packet_disconnect("Invalid ssh1 packet type: %d", type);
Ben Lindstrom80c6d772001-06-05 21:09:18 +00001231 return type;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001232}
Damien Miller95def091999-11-25 00:26:21 +11001233
Ben Lindstrombba81212001-06-25 05:01:22 +00001234static int
Damien Millerdff50992002-01-22 23:16:32 +11001235packet_read_poll2(u_int32_t *seqnr_p)
Damien Miller33b13562000-04-04 14:38:59 +10001236{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001237 u_int padlen, need;
Ben Lindstrom4a7714a2002-02-26 18:04:38 +00001238 u_char *macbuf, *cp, type;
Damien Millereccb9de2005-06-17 12:59:34 +10001239 u_int maclen, block_size;
Damien Miller33b13562000-04-04 14:38:59 +10001240 Enc *enc = NULL;
1241 Mac *mac = NULL;
1242 Comp *comp = NULL;
1243
Darren Tuckerf7288d72009-06-21 18:12:20 +10001244 if (active_state->packet_discard)
Damien Miller13ae44c2009-01-28 16:38:41 +11001245 return SSH_MSG_NONE;
1246
Darren Tuckerf7288d72009-06-21 18:12:20 +10001247 if (active_state->newkeys[MODE_IN] != NULL) {
1248 enc = &active_state->newkeys[MODE_IN]->enc;
1249 mac = &active_state->newkeys[MODE_IN]->mac;
1250 comp = &active_state->newkeys[MODE_IN]->comp;
Damien Miller33b13562000-04-04 14:38:59 +10001251 }
1252 maclen = mac && mac->enabled ? mac->mac_len : 0;
Damien Miller963f6b22002-02-19 15:21:23 +11001253 block_size = enc ? enc->block_size : 8;
Damien Miller33b13562000-04-04 14:38:59 +10001254
Darren Tuckerf7288d72009-06-21 18:12:20 +10001255 if (active_state->packlen == 0) {
Damien Miller33b13562000-04-04 14:38:59 +10001256 /*
1257 * check if input size is less than the cipher block size,
1258 * decrypt first block and extract length of incoming packet
1259 */
Darren Tuckerf7288d72009-06-21 18:12:20 +10001260 if (buffer_len(&active_state->input) < block_size)
Damien Miller33b13562000-04-04 14:38:59 +10001261 return SSH_MSG_NONE;
Darren Tuckerf7288d72009-06-21 18:12:20 +10001262 buffer_clear(&active_state->incoming_packet);
1263 cp = buffer_append_space(&active_state->incoming_packet,
Damien Miller33b13562000-04-04 14:38:59 +10001264 block_size);
Darren Tuckerf7288d72009-06-21 18:12:20 +10001265 cipher_crypt(&active_state->receive_context, cp,
1266 buffer_ptr(&active_state->input), block_size);
1267 cp = buffer_ptr(&active_state->incoming_packet);
1268 active_state->packlen = get_u32(cp);
1269 if (active_state->packlen < 1 + 4 ||
1270 active_state->packlen > PACKET_MAX_SIZE) {
Darren Tuckera8151da2003-09-22 21:06:46 +10001271#ifdef PACKET_DEBUG
Darren Tuckerf7288d72009-06-21 18:12:20 +10001272 buffer_dump(&active_state->incoming_packet);
Darren Tuckera8151da2003-09-22 21:06:46 +10001273#endif
Darren Tuckerf7288d72009-06-21 18:12:20 +10001274 logit("Bad packet length %u.", active_state->packlen);
1275 packet_start_discard(enc, mac, active_state->packlen,
Damien Miller13ae44c2009-01-28 16:38:41 +11001276 PACKET_MAX_SIZE);
1277 return SSH_MSG_NONE;
Damien Miller33b13562000-04-04 14:38:59 +10001278 }
Darren Tuckerf7288d72009-06-21 18:12:20 +10001279 DBG(debug("input: packet len %u", active_state->packlen+4));
1280 buffer_consume(&active_state->input, block_size);
Damien Miller33b13562000-04-04 14:38:59 +10001281 }
1282 /* we have a partial packet of block_size bytes */
Darren Tuckerf7288d72009-06-21 18:12:20 +10001283 need = 4 + active_state->packlen - block_size;
Damien Miller33b13562000-04-04 14:38:59 +10001284 DBG(debug("partial packet %d, need %d, maclen %d", block_size,
1285 need, maclen));
Darren Tucker99d11a32008-12-01 21:40:48 +11001286 if (need % block_size != 0) {
1287 logit("padding error: need %d block %d mod %d",
Damien Miller33b13562000-04-04 14:38:59 +10001288 need, block_size, need % block_size);
Darren Tuckerf7288d72009-06-21 18:12:20 +10001289 packet_start_discard(enc, mac, active_state->packlen,
Damien Miller13ae44c2009-01-28 16:38:41 +11001290 PACKET_MAX_SIZE - block_size);
1291 return SSH_MSG_NONE;
Darren Tucker99d11a32008-12-01 21:40:48 +11001292 }
Damien Miller33b13562000-04-04 14:38:59 +10001293 /*
1294 * check if the entire packet has been received and
1295 * decrypt into incoming_packet
1296 */
Darren Tuckerf7288d72009-06-21 18:12:20 +10001297 if (buffer_len(&active_state->input) < need + maclen)
Damien Miller33b13562000-04-04 14:38:59 +10001298 return SSH_MSG_NONE;
1299#ifdef PACKET_DEBUG
1300 fprintf(stderr, "read_poll enc/full: ");
Darren Tuckerf7288d72009-06-21 18:12:20 +10001301 buffer_dump(&active_state->input);
Damien Miller33b13562000-04-04 14:38:59 +10001302#endif
Darren Tuckerf7288d72009-06-21 18:12:20 +10001303 cp = buffer_append_space(&active_state->incoming_packet, need);
1304 cipher_crypt(&active_state->receive_context, cp,
1305 buffer_ptr(&active_state->input), need);
1306 buffer_consume(&active_state->input, need);
Damien Miller33b13562000-04-04 14:38:59 +10001307 /*
1308 * compute MAC over seqnr and packet,
1309 * increment sequence number for incoming packet
1310 */
Damien Miller4af51302000-04-16 11:18:38 +10001311 if (mac && mac->enabled) {
Darren Tuckerf7288d72009-06-21 18:12:20 +10001312 macbuf = mac_compute(mac, active_state->p_read.seqnr,
1313 buffer_ptr(&active_state->incoming_packet),
1314 buffer_len(&active_state->incoming_packet));
Damien Millerea1651c2010-07-16 13:58:37 +10001315 if (timingsafe_bcmp(macbuf, buffer_ptr(&active_state->input),
Darren Tuckerf7288d72009-06-21 18:12:20 +10001316 mac->mac_len) != 0) {
Damien Miller13ae44c2009-01-28 16:38:41 +11001317 logit("Corrupted MAC on input.");
1318 if (need > PACKET_MAX_SIZE)
1319 fatal("internal error need %d", need);
Darren Tuckerf7288d72009-06-21 18:12:20 +10001320 packet_start_discard(enc, mac, active_state->packlen,
Damien Miller13ae44c2009-01-28 16:38:41 +11001321 PACKET_MAX_SIZE - need);
1322 return SSH_MSG_NONE;
1323 }
1324
Darren Tuckerf7288d72009-06-21 18:12:20 +10001325 DBG(debug("MAC #%d ok", active_state->p_read.seqnr));
1326 buffer_consume(&active_state->input, mac->mac_len);
Damien Miller33b13562000-04-04 14:38:59 +10001327 }
Damien Miller13ae44c2009-01-28 16:38:41 +11001328 /* XXX now it's safe to use fatal/packet_disconnect */
Damien Miller278f9072001-12-21 15:00:19 +11001329 if (seqnr_p != NULL)
Darren Tuckerf7288d72009-06-21 18:12:20 +10001330 *seqnr_p = active_state->p_read.seqnr;
1331 if (++active_state->p_read.seqnr == 0)
Damien Miller996acd22003-04-09 20:59:48 +10001332 logit("incoming seqnr wraps around");
Darren Tuckerf7288d72009-06-21 18:12:20 +10001333 if (++active_state->p_read.packets == 0)
Damien Millera5539d22003-04-09 20:50:06 +10001334 if (!(datafellows & SSH_BUG_NOREKEY))
1335 fatal("XXX too many packets with same key");
Darren Tuckerf7288d72009-06-21 18:12:20 +10001336 active_state->p_read.blocks += (active_state->packlen + 4) / block_size;
1337 active_state->p_read.bytes += active_state->packlen + 4;
Damien Miller33b13562000-04-04 14:38:59 +10001338
1339 /* get padlen */
Darren Tuckerf7288d72009-06-21 18:12:20 +10001340 cp = buffer_ptr(&active_state->incoming_packet);
Ben Lindstrom4a7714a2002-02-26 18:04:38 +00001341 padlen = cp[4];
Damien Miller33b13562000-04-04 14:38:59 +10001342 DBG(debug("input: padlen %d", padlen));
1343 if (padlen < 4)
1344 packet_disconnect("Corrupted padlen %d on input.", padlen);
1345
1346 /* skip packet size + padlen, discard padding */
Darren Tuckerf7288d72009-06-21 18:12:20 +10001347 buffer_consume(&active_state->incoming_packet, 4 + 1);
1348 buffer_consume_end(&active_state->incoming_packet, padlen);
Damien Miller33b13562000-04-04 14:38:59 +10001349
Darren Tuckerf7288d72009-06-21 18:12:20 +10001350 DBG(debug("input: len before de-compress %d",
1351 buffer_len(&active_state->incoming_packet)));
Damien Miller33b13562000-04-04 14:38:59 +10001352 if (comp && comp->enabled) {
Darren Tuckerf7288d72009-06-21 18:12:20 +10001353 buffer_clear(&active_state->compression_buffer);
1354 buffer_uncompress(&active_state->incoming_packet,
1355 &active_state->compression_buffer);
1356 buffer_clear(&active_state->incoming_packet);
1357 buffer_append(&active_state->incoming_packet,
1358 buffer_ptr(&active_state->compression_buffer),
1359 buffer_len(&active_state->compression_buffer));
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001360 DBG(debug("input: len after de-compress %d",
Darren Tuckerf7288d72009-06-21 18:12:20 +10001361 buffer_len(&active_state->incoming_packet)));
Damien Miller33b13562000-04-04 14:38:59 +10001362 }
1363 /*
1364 * get packet type, implies consume.
1365 * return length of payload (without type field)
1366 */
Darren Tuckerf7288d72009-06-21 18:12:20 +10001367 type = buffer_get_char(&active_state->incoming_packet);
Darren Tuckerb2694f02004-11-05 20:27:54 +11001368 if (type < SSH2_MSG_MIN || type >= SSH2_MSG_LOCAL_MIN)
1369 packet_disconnect("Invalid ssh2 packet type: %d", type);
Ben Lindstrom2d90e002001-04-04 02:00:54 +00001370 if (type == SSH2_MSG_NEWKEYS)
1371 set_newkeys(MODE_IN);
Darren Tuckerf7288d72009-06-21 18:12:20 +10001372 else if (type == SSH2_MSG_USERAUTH_SUCCESS &&
1373 !active_state->server_side)
Damien Miller9786e6e2005-07-26 21:54:56 +10001374 packet_enable_delayed_compress();
Damien Miller33b13562000-04-04 14:38:59 +10001375#ifdef PACKET_DEBUG
Ben Lindstrom204e4882001-03-05 06:47:00 +00001376 fprintf(stderr, "read/plain[%d]:\r\n", type);
Darren Tuckerf7288d72009-06-21 18:12:20 +10001377 buffer_dump(&active_state->incoming_packet);
Damien Miller33b13562000-04-04 14:38:59 +10001378#endif
Ben Lindstrom80c6d772001-06-05 21:09:18 +00001379 /* reset for next packet */
Darren Tuckerf7288d72009-06-21 18:12:20 +10001380 active_state->packlen = 0;
Ben Lindstrom80c6d772001-06-05 21:09:18 +00001381 return type;
Damien Miller33b13562000-04-04 14:38:59 +10001382}
1383
1384int
Damien Millerdff50992002-01-22 23:16:32 +11001385packet_read_poll_seqnr(u_int32_t *seqnr_p)
Damien Miller33b13562000-04-04 14:38:59 +10001386{
Ben Lindstrom3f584742002-06-23 21:49:25 +00001387 u_int reason, seqnr;
Ben Lindstrom80c6d772001-06-05 21:09:18 +00001388 u_char type;
Damien Miller33b13562000-04-04 14:38:59 +10001389 char *msg;
Damien Miller33b13562000-04-04 14:38:59 +10001390
Ben Lindstrom80c6d772001-06-05 21:09:18 +00001391 for (;;) {
1392 if (compat20) {
Damien Millerdff50992002-01-22 23:16:32 +11001393 type = packet_read_poll2(seqnr_p);
Darren Tucker136e56f2008-06-08 12:49:30 +10001394 if (type) {
Darren Tuckerf7288d72009-06-21 18:12:20 +10001395 active_state->keep_alive_timeouts = 0;
Damien Miller33b13562000-04-04 14:38:59 +10001396 DBG(debug("received packet type %d", type));
Darren Tucker136e56f2008-06-08 12:49:30 +10001397 }
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001398 switch (type) {
Damien Miller5ed3d572008-02-10 22:27:47 +11001399 case SSH2_MSG_IGNORE:
Damien Miller58226f62008-03-07 18:33:30 +11001400 debug3("Received SSH2_MSG_IGNORE");
Damien Miller5ed3d572008-02-10 22:27:47 +11001401 break;
Damien Miller33b13562000-04-04 14:38:59 +10001402 case SSH2_MSG_DEBUG:
1403 packet_get_char();
1404 msg = packet_get_string(NULL);
1405 debug("Remote: %.900s", msg);
1406 xfree(msg);
1407 msg = packet_get_string(NULL);
1408 xfree(msg);
1409 break;
1410 case SSH2_MSG_DISCONNECT:
1411 reason = packet_get_int();
1412 msg = packet_get_string(NULL);
Damien Miller996acd22003-04-09 20:59:48 +10001413 logit("Received disconnect from %s: %u: %.400s",
Ben Lindstrom3f584742002-06-23 21:49:25 +00001414 get_remote_ipaddr(), reason, msg);
Damien Miller33b13562000-04-04 14:38:59 +10001415 xfree(msg);
Darren Tucker3e33cec2003-10-02 16:12:36 +10001416 cleanup_exit(255);
Damien Miller33b13562000-04-04 14:38:59 +10001417 break;
Damien Miller659811f2002-01-22 23:23:11 +11001418 case SSH2_MSG_UNIMPLEMENTED:
1419 seqnr = packet_get_int();
Ben Lindstrom3f584742002-06-23 21:49:25 +00001420 debug("Received SSH2_MSG_UNIMPLEMENTED for %u",
1421 seqnr);
Damien Miller5ed3d572008-02-10 22:27:47 +11001422 break;
Damien Miller33b13562000-04-04 14:38:59 +10001423 default:
1424 return type;
Kevin Stevesef4eea92001-02-05 12:42:17 +00001425 }
Damien Miller33b13562000-04-04 14:38:59 +10001426 } else {
Damien Millerdff50992002-01-22 23:16:32 +11001427 type = packet_read_poll1();
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001428 switch (type) {
Damien Miller33b13562000-04-04 14:38:59 +10001429 case SSH_MSG_IGNORE:
1430 break;
1431 case SSH_MSG_DEBUG:
1432 msg = packet_get_string(NULL);
1433 debug("Remote: %.900s", msg);
1434 xfree(msg);
1435 break;
1436 case SSH_MSG_DISCONNECT:
1437 msg = packet_get_string(NULL);
Damien Miller996acd22003-04-09 20:59:48 +10001438 logit("Received disconnect from %s: %.400s",
Ben Lindstrom3f584742002-06-23 21:49:25 +00001439 get_remote_ipaddr(), msg);
Darren Tucker3e33cec2003-10-02 16:12:36 +10001440 cleanup_exit(255);
Damien Miller33b13562000-04-04 14:38:59 +10001441 break;
1442 default:
Ben Lindstrom80c6d772001-06-05 21:09:18 +00001443 if (type)
Damien Miller33b13562000-04-04 14:38:59 +10001444 DBG(debug("received packet type %d", type));
1445 return type;
Kevin Stevesef4eea92001-02-05 12:42:17 +00001446 }
Damien Miller33b13562000-04-04 14:38:59 +10001447 }
1448 }
1449}
1450
Damien Miller5428f641999-11-25 11:54:57 +11001451/*
1452 * Buffers the given amount of input characters. This is intended to be used
1453 * together with packet_read_poll.
1454 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001455
1456void
Ben Lindstrom46c16222000-12-22 01:43:59 +00001457packet_process_incoming(const char *buf, u_int len)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001458{
Darren Tuckerf7288d72009-06-21 18:12:20 +10001459 if (active_state->packet_discard) {
1460 active_state->keep_alive_timeouts = 0; /* ?? */
1461 if (len >= active_state->packet_discard)
Damien Miller13ae44c2009-01-28 16:38:41 +11001462 packet_stop_discard();
Darren Tuckerf7288d72009-06-21 18:12:20 +10001463 active_state->packet_discard -= len;
Damien Miller13ae44c2009-01-28 16:38:41 +11001464 return;
1465 }
Darren Tuckerf7288d72009-06-21 18:12:20 +10001466 buffer_append(&active_state->input, buf, len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001467}
1468
1469/* Returns a character from the packet. */
1470
Ben Lindstrom46c16222000-12-22 01:43:59 +00001471u_int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00001472packet_get_char(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001473{
Damien Miller95def091999-11-25 00:26:21 +11001474 char ch;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001475
Darren Tuckerf7288d72009-06-21 18:12:20 +10001476 buffer_get(&active_state->incoming_packet, &ch, 1);
Ben Lindstrom46c16222000-12-22 01:43:59 +00001477 return (u_char) ch;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001478}
1479
1480/* Returns an integer from the packet data. */
1481
Ben Lindstrom46c16222000-12-22 01:43:59 +00001482u_int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00001483packet_get_int(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001484{
Darren Tuckerf7288d72009-06-21 18:12:20 +10001485 return buffer_get_int(&active_state->incoming_packet);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001486}
1487
Darren Tucker761c3892009-06-21 18:16:26 +10001488/* Returns an 64 bit integer from the packet data. */
1489
1490u_int64_t
1491packet_get_int64(void)
1492{
1493 return buffer_get_int64(&active_state->incoming_packet);
1494}
1495
Damien Miller5428f641999-11-25 11:54:57 +11001496/*
1497 * Returns an arbitrary precision integer from the packet data. The integer
1498 * must have been initialized before this call.
1499 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001500
1501void
Damien Millerd432ccf2002-01-22 23:14:44 +11001502packet_get_bignum(BIGNUM * value)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001503{
Darren Tuckerf7288d72009-06-21 18:12:20 +10001504 buffer_get_bignum(&active_state->incoming_packet, value);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001505}
1506
Damien Miller33b13562000-04-04 14:38:59 +10001507void
Damien Millerd432ccf2002-01-22 23:14:44 +11001508packet_get_bignum2(BIGNUM * value)
Damien Miller33b13562000-04-04 14:38:59 +10001509{
Darren Tuckerf7288d72009-06-21 18:12:20 +10001510 buffer_get_bignum2(&active_state->incoming_packet, value);
Damien Miller33b13562000-04-04 14:38:59 +10001511}
1512
Damien Miller6af914a2010-09-10 11:39:26 +10001513#ifdef OPENSSL_HAS_ECC
Damien Millereb8b60e2010-08-31 22:41:14 +10001514void
1515packet_get_ecpoint(const EC_GROUP *curve, EC_POINT *point)
1516{
1517 buffer_get_ecpoint(&active_state->incoming_packet, curve, point);
1518}
Damien Miller6af914a2010-09-10 11:39:26 +10001519#endif
Damien Millereb8b60e2010-08-31 22:41:14 +10001520
Damien Miller5a6b4fe2001-12-21 14:56:54 +11001521void *
Damien Millereccb9de2005-06-17 12:59:34 +10001522packet_get_raw(u_int *length_ptr)
Damien Miller33b13562000-04-04 14:38:59 +10001523{
Darren Tuckerf7288d72009-06-21 18:12:20 +10001524 u_int bytes = buffer_len(&active_state->incoming_packet);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001525
Damien Miller33b13562000-04-04 14:38:59 +10001526 if (length_ptr != NULL)
1527 *length_ptr = bytes;
Darren Tuckerf7288d72009-06-21 18:12:20 +10001528 return buffer_ptr(&active_state->incoming_packet);
Damien Miller33b13562000-04-04 14:38:59 +10001529}
1530
Damien Miller4af51302000-04-16 11:18:38 +10001531int
1532packet_remaining(void)
1533{
Darren Tuckerf7288d72009-06-21 18:12:20 +10001534 return buffer_len(&active_state->incoming_packet);
Damien Miller4af51302000-04-16 11:18:38 +10001535}
1536
Damien Miller5428f641999-11-25 11:54:57 +11001537/*
1538 * Returns a string from the packet data. The string is allocated using
1539 * xmalloc; it is the responsibility of the calling program to free it when
1540 * no longer needed. The length_ptr argument may be NULL, or point to an
1541 * integer into which the length of the string is stored.
1542 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001543
Damien Miller5a6b4fe2001-12-21 14:56:54 +11001544void *
Ben Lindstrom46c16222000-12-22 01:43:59 +00001545packet_get_string(u_int *length_ptr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001546{
Darren Tuckerf7288d72009-06-21 18:12:20 +10001547 return buffer_get_string(&active_state->incoming_packet, length_ptr);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001548}
1549
Damien Millerdb255ca2008-05-19 14:59:37 +10001550void *
1551packet_get_string_ptr(u_int *length_ptr)
1552{
Darren Tuckerf7288d72009-06-21 18:12:20 +10001553 return buffer_get_string_ptr(&active_state->incoming_packet, length_ptr);
Damien Millerdb255ca2008-05-19 14:59:37 +10001554}
1555
Damien Millerda108ec2010-08-31 22:36:39 +10001556/* Ensures the returned string has no embedded \0 characters in it. */
1557char *
1558packet_get_cstring(u_int *length_ptr)
1559{
1560 return buffer_get_cstring(&active_state->incoming_packet, length_ptr);
1561}
1562
Damien Miller5428f641999-11-25 11:54:57 +11001563/*
1564 * Sends a diagnostic message from the server to the client. This message
1565 * can be sent at any time (but not while constructing another message). The
1566 * message is printed immediately, but only if the client is being executed
1567 * in verbose mode. These messages are primarily intended to ease debugging
1568 * authentication problems. The length of the formatted message must not
1569 * exceed 1024 bytes. This will automatically call packet_write_wait.
1570 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001571
1572void
Damien Miller95def091999-11-25 00:26:21 +11001573packet_send_debug(const char *fmt,...)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001574{
Damien Miller95def091999-11-25 00:26:21 +11001575 char buf[1024];
1576 va_list args;
1577
Ben Lindstroma14ee472000-12-07 01:24:58 +00001578 if (compat20 && (datafellows & SSH_BUG_DEBUG))
1579 return;
1580
Damien Miller95def091999-11-25 00:26:21 +11001581 va_start(args, fmt);
1582 vsnprintf(buf, sizeof(buf), fmt, args);
1583 va_end(args);
1584
Damien Miller7c8af4f2000-05-01 08:24:07 +10001585 if (compat20) {
1586 packet_start(SSH2_MSG_DEBUG);
1587 packet_put_char(0); /* bool: always display */
1588 packet_put_cstring(buf);
1589 packet_put_cstring("");
1590 } else {
1591 packet_start(SSH_MSG_DEBUG);
1592 packet_put_cstring(buf);
1593 }
Damien Miller95def091999-11-25 00:26:21 +11001594 packet_send();
1595 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001596}
1597
Damien Miller5428f641999-11-25 11:54:57 +11001598/*
1599 * Logs the error plus constructs and sends a disconnect packet, closes the
1600 * connection, and exits. This function never returns. The error message
1601 * should not contain a newline. The length of the formatted message must
1602 * not exceed 1024 bytes.
1603 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001604
1605void
Damien Miller95def091999-11-25 00:26:21 +11001606packet_disconnect(const char *fmt,...)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001607{
Damien Miller95def091999-11-25 00:26:21 +11001608 char buf[1024];
1609 va_list args;
1610 static int disconnecting = 0;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001611
Damien Miller95def091999-11-25 00:26:21 +11001612 if (disconnecting) /* Guard against recursive invocations. */
1613 fatal("packet_disconnect called recursively.");
1614 disconnecting = 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001615
Damien Miller5428f641999-11-25 11:54:57 +11001616 /*
1617 * Format the message. Note that the caller must make sure the
1618 * message is of limited size.
1619 */
Damien Miller95def091999-11-25 00:26:21 +11001620 va_start(args, fmt);
1621 vsnprintf(buf, sizeof(buf), fmt, args);
1622 va_end(args);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001623
Ben Lindstrom9bda7ae2002-11-09 15:46:24 +00001624 /* Display the error locally */
Damien Miller996acd22003-04-09 20:59:48 +10001625 logit("Disconnecting: %.100s", buf);
Ben Lindstrom9bda7ae2002-11-09 15:46:24 +00001626
Damien Miller95def091999-11-25 00:26:21 +11001627 /* Send the disconnect message to the other side, and wait for it to get sent. */
Damien Miller33b13562000-04-04 14:38:59 +10001628 if (compat20) {
1629 packet_start(SSH2_MSG_DISCONNECT);
1630 packet_put_int(SSH2_DISCONNECT_PROTOCOL_ERROR);
1631 packet_put_cstring(buf);
1632 packet_put_cstring("");
1633 } else {
1634 packet_start(SSH_MSG_DISCONNECT);
Ben Lindstrom664408d2001-06-09 01:42:01 +00001635 packet_put_cstring(buf);
Damien Miller33b13562000-04-04 14:38:59 +10001636 }
Damien Miller95def091999-11-25 00:26:21 +11001637 packet_send();
1638 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001639
Damien Miller95def091999-11-25 00:26:21 +11001640 /* Stop listening for connections. */
Ben Lindstrom601e4362001-06-21 03:19:23 +00001641 channel_close_all();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001642
Damien Miller95def091999-11-25 00:26:21 +11001643 /* Close the connection. */
1644 packet_close();
Darren Tucker3e33cec2003-10-02 16:12:36 +10001645 cleanup_exit(255);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001646}
1647
Damien Miller5428f641999-11-25 11:54:57 +11001648/* Checks if there is any buffered output, and tries to write some of the output. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001649
1650void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00001651packet_write_poll(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001652{
Darren Tuckerf7288d72009-06-21 18:12:20 +10001653 int len = buffer_len(&active_state->output);
Darren Tuckerc5564e12009-06-21 18:53:53 +10001654 int cont;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001655
Damien Miller95def091999-11-25 00:26:21 +11001656 if (len > 0) {
Darren Tuckerc5564e12009-06-21 18:53:53 +10001657 cont = 0;
1658 len = roaming_write(active_state->connection_out,
1659 buffer_ptr(&active_state->output), len, &cont);
Damien Millerd874fa52008-07-05 09:40:56 +10001660 if (len == -1) {
Damien Millerea437422009-10-02 11:49:03 +10001661 if (errno == EINTR || errno == EAGAIN ||
1662 errno == EWOULDBLOCK)
Damien Miller95def091999-11-25 00:26:21 +11001663 return;
Damien Millerd874fa52008-07-05 09:40:56 +10001664 fatal("Write failed: %.100s", strerror(errno));
Damien Miller95def091999-11-25 00:26:21 +11001665 }
Darren Tuckerc5564e12009-06-21 18:53:53 +10001666 if (len == 0 && !cont)
Damien Millerd874fa52008-07-05 09:40:56 +10001667 fatal("Write connection closed");
Darren Tuckerf7288d72009-06-21 18:12:20 +10001668 buffer_consume(&active_state->output, len);
Damien Miller95def091999-11-25 00:26:21 +11001669 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001670}
1671
Damien Miller5428f641999-11-25 11:54:57 +11001672/*
1673 * Calls packet_write_poll repeatedly until all pending output data has been
1674 * written.
1675 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001676
1677void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00001678packet_write_wait(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001679{
Ben Lindstromcb978aa2001-03-05 07:07:49 +00001680 fd_set *setp;
Darren Tucker3fc464e2008-06-13 06:42:45 +10001681 int ret, ms_remain;
1682 struct timeval start, timeout, *timeoutp = NULL;
Ben Lindstromcb978aa2001-03-05 07:07:49 +00001683
Darren Tuckerf7288d72009-06-21 18:12:20 +10001684 setp = (fd_set *)xcalloc(howmany(active_state->connection_out + 1,
1685 NFDBITS), sizeof(fd_mask));
Damien Miller95def091999-11-25 00:26:21 +11001686 packet_write_poll();
1687 while (packet_have_data_to_write()) {
Darren Tuckerf7288d72009-06-21 18:12:20 +10001688 memset(setp, 0, howmany(active_state->connection_out + 1,
1689 NFDBITS) * sizeof(fd_mask));
1690 FD_SET(active_state->connection_out, setp);
Darren Tucker3fc464e2008-06-13 06:42:45 +10001691
Darren Tuckerf7288d72009-06-21 18:12:20 +10001692 if (active_state->packet_timeout_ms > 0) {
1693 ms_remain = active_state->packet_timeout_ms;
Darren Tucker3fc464e2008-06-13 06:42:45 +10001694 timeoutp = &timeout;
1695 }
1696 for (;;) {
Darren Tuckerf7288d72009-06-21 18:12:20 +10001697 if (active_state->packet_timeout_ms != -1) {
Darren Tucker3fc464e2008-06-13 06:42:45 +10001698 ms_to_timeval(&timeout, ms_remain);
1699 gettimeofday(&start, NULL);
1700 }
Darren Tuckerf7288d72009-06-21 18:12:20 +10001701 if ((ret = select(active_state->connection_out + 1,
1702 NULL, setp, NULL, timeoutp)) >= 0)
Darren Tucker3fc464e2008-06-13 06:42:45 +10001703 break;
Damien Millerea437422009-10-02 11:49:03 +10001704 if (errno != EAGAIN && errno != EINTR &&
1705 errno != EWOULDBLOCK)
Darren Tucker3fc464e2008-06-13 06:42:45 +10001706 break;
Darren Tuckerf7288d72009-06-21 18:12:20 +10001707 if (active_state->packet_timeout_ms == -1)
Darren Tucker3fc464e2008-06-13 06:42:45 +10001708 continue;
1709 ms_subtract_diff(&start, &ms_remain);
1710 if (ms_remain <= 0) {
1711 ret = 0;
1712 break;
1713 }
1714 }
1715 if (ret == 0) {
1716 logit("Connection to %.200s timed out while "
1717 "waiting to write", get_remote_ipaddr());
1718 cleanup_exit(255);
1719 }
Damien Miller95def091999-11-25 00:26:21 +11001720 packet_write_poll();
1721 }
Ben Lindstromcb978aa2001-03-05 07:07:49 +00001722 xfree(setp);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001723}
1724
1725/* Returns true if there is buffered data to write to the connection. */
1726
1727int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00001728packet_have_data_to_write(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001729{
Darren Tuckerf7288d72009-06-21 18:12:20 +10001730 return buffer_len(&active_state->output) != 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001731}
1732
1733/* Returns true if there is not too much data to write to the connection. */
1734
1735int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00001736packet_not_very_much_data_to_write(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001737{
Darren Tuckerf7288d72009-06-21 18:12:20 +10001738 if (active_state->interactive_mode)
1739 return buffer_len(&active_state->output) < 16384;
Damien Miller95def091999-11-25 00:26:21 +11001740 else
Darren Tuckerf7288d72009-06-21 18:12:20 +10001741 return buffer_len(&active_state->output) < 128 * 1024;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001742}
1743
Ben Lindstromfaa1ea82002-12-23 02:42:52 +00001744static void
Damien Miller0dac6fb2010-11-20 15:19:38 +11001745packet_set_tos(int tos)
Ben Lindstroma7433982002-12-23 02:41:41 +00001746{
Damien Millerd2ac5d72011-05-15 08:43:13 +10001747#ifndef IP_TOS_IS_BROKEN
1748 if (!packet_connection_is_on_socket())
Ben Lindstroma7433982002-12-23 02:41:41 +00001749 return;
Damien Millerd2ac5d72011-05-15 08:43:13 +10001750 switch (packet_connection_af()) {
1751# ifdef IP_TOS
1752 case AF_INET:
1753 debug3("%s: set IP_TOS 0x%02x", __func__, tos);
1754 if (setsockopt(active_state->connection_in,
1755 IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0)
1756 error("setsockopt IP_TOS %d: %.100s:",
1757 tos, strerror(errno));
1758 break;
1759# endif /* IP_TOS */
1760# ifdef IPV6_TCLASS
1761 case AF_INET6:
1762 debug3("%s: set IPV6_TCLASS 0x%02x", __func__, tos);
1763 if (setsockopt(active_state->connection_in,
1764 IPPROTO_IPV6, IPV6_TCLASS, &tos, sizeof(tos)) < 0)
1765 error("setsockopt IPV6_TCLASS %d: %.100s:",
1766 tos, strerror(errno));
1767 break;
Damien Millerd2ac5d72011-05-15 08:43:13 +10001768# endif /* IPV6_TCLASS */
Damien Miller23f425b2011-05-15 08:58:15 +10001769 }
Damien Millerd2ac5d72011-05-15 08:43:13 +10001770#endif /* IP_TOS_IS_BROKEN */
Damien Miller5924ceb2003-11-22 15:02:42 +11001771}
Ben Lindstroma7433982002-12-23 02:41:41 +00001772
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001773/* Informs that the current session is interactive. Sets IP flags for that. */
1774
1775void
Damien Miller0dac6fb2010-11-20 15:19:38 +11001776packet_set_interactive(int interactive, int qos_interactive, int qos_bulk)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001777{
Darren Tucker7b935c72009-06-21 18:59:36 +10001778 if (active_state->set_interactive_called)
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001779 return;
Darren Tucker7b935c72009-06-21 18:59:36 +10001780 active_state->set_interactive_called = 1;
Ben Lindstrombf555ba2001-01-18 02:04:35 +00001781
Damien Miller95def091999-11-25 00:26:21 +11001782 /* Record that we are in interactive mode. */
Darren Tuckerf7288d72009-06-21 18:12:20 +10001783 active_state->interactive_mode = interactive;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001784
Damien Miller34132e52000-01-14 15:45:46 +11001785 /* Only set socket options if using a socket. */
1786 if (!packet_connection_is_on_socket())
Ben Lindstrom93b6b772003-04-27 17:55:33 +00001787 return;
Darren Tuckerf7288d72009-06-21 18:12:20 +10001788 set_nodelay(active_state->connection_in);
Damien Miller0dac6fb2010-11-20 15:19:38 +11001789 packet_set_tos(interactive ? qos_interactive : qos_bulk);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001790}
1791
1792/* Returns true if the current connection is interactive. */
1793
1794int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00001795packet_is_interactive(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001796{
Darren Tuckerf7288d72009-06-21 18:12:20 +10001797 return active_state->interactive_mode;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001798}
Damien Miller6162d121999-11-21 13:23:52 +11001799
Darren Tucker1f8311c2004-05-13 16:39:33 +10001800int
Darren Tucker502d3842003-06-28 12:38:01 +10001801packet_set_maxsize(u_int s)
Damien Miller6162d121999-11-21 13:23:52 +11001802{
Darren Tucker7b935c72009-06-21 18:59:36 +10001803 if (active_state->set_maxsize_called) {
Damien Miller996acd22003-04-09 20:59:48 +10001804 logit("packet_set_maxsize: called twice: old %d new %d",
Darren Tuckerf7288d72009-06-21 18:12:20 +10001805 active_state->max_packet_size, s);
Damien Miller95def091999-11-25 00:26:21 +11001806 return -1;
1807 }
1808 if (s < 4 * 1024 || s > 1024 * 1024) {
Damien Miller996acd22003-04-09 20:59:48 +10001809 logit("packet_set_maxsize: bad size %d", s);
Damien Miller95def091999-11-25 00:26:21 +11001810 return -1;
1811 }
Darren Tucker7b935c72009-06-21 18:59:36 +10001812 active_state->set_maxsize_called = 1;
Ben Lindstrom16d45b32001-06-13 04:39:18 +00001813 debug("packet_set_maxsize: setting to %d", s);
Darren Tuckerf7288d72009-06-21 18:12:20 +10001814 active_state->max_packet_size = s;
Damien Miller95def091999-11-25 00:26:21 +11001815 return s;
Damien Miller6162d121999-11-21 13:23:52 +11001816}
Ben Lindstrom5699c5f2001-03-05 06:17:49 +00001817
Darren Tuckerf7288d72009-06-21 18:12:20 +10001818int
1819packet_inc_alive_timeouts(void)
1820{
1821 return ++active_state->keep_alive_timeouts;
1822}
1823
1824void
1825packet_set_alive_timeouts(int ka)
1826{
1827 active_state->keep_alive_timeouts = ka;
1828}
1829
1830u_int
1831packet_get_maxsize(void)
1832{
1833 return active_state->max_packet_size;
1834}
1835
Damien Miller9f643902001-11-12 11:02:52 +11001836/* roundup current message to pad bytes */
1837void
1838packet_add_padding(u_char pad)
1839{
Darren Tuckerf7288d72009-06-21 18:12:20 +10001840 active_state->extra_pad = pad;
Damien Miller9f643902001-11-12 11:02:52 +11001841}
1842
Ben Lindstrom5699c5f2001-03-05 06:17:49 +00001843/*
1844 * 9.2. Ignored Data Message
Ben Lindstroma3700052001-04-05 23:26:32 +00001845 *
Ben Lindstrom5699c5f2001-03-05 06:17:49 +00001846 * byte SSH_MSG_IGNORE
1847 * string data
Ben Lindstroma3700052001-04-05 23:26:32 +00001848 *
Ben Lindstrom5699c5f2001-03-05 06:17:49 +00001849 * All implementations MUST understand (and ignore) this message at any
1850 * time (after receiving the protocol version). No implementation is
1851 * required to send them. This message can be used as an additional
1852 * protection measure against advanced traffic analysis techniques.
1853 */
Ben Lindstrome229b252001-03-05 06:28:06 +00001854void
1855packet_send_ignore(int nbytes)
1856{
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001857 u_int32_t rnd = 0;
Ben Lindstrome229b252001-03-05 06:28:06 +00001858 int i;
1859
1860 packet_start(compat20 ? SSH2_MSG_IGNORE : SSH_MSG_IGNORE);
Ben Lindstrom5699c5f2001-03-05 06:17:49 +00001861 packet_put_int(nbytes);
Damien Miller9f0f5c62001-12-21 14:45:46 +11001862 for (i = 0; i < nbytes; i++) {
Ben Lindstrom5699c5f2001-03-05 06:17:49 +00001863 if (i % 4 == 0)
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001864 rnd = arc4random();
Damien Miller8ba29fe2006-03-26 14:25:19 +11001865 packet_put_char((u_char)rnd & 0xff);
Darren Tucker3f9fdc72004-06-22 12:56:01 +10001866 rnd >>= 8;
Ben Lindstrom5699c5f2001-03-05 06:17:49 +00001867 }
1868}
Damien Millera5539d22003-04-09 20:50:06 +10001869
Darren Tucker1f8311c2004-05-13 16:39:33 +10001870#define MAX_PACKETS (1U<<31)
Damien Millera5539d22003-04-09 20:50:06 +10001871int
1872packet_need_rekeying(void)
1873{
1874 if (datafellows & SSH_BUG_NOREKEY)
1875 return 0;
1876 return
Darren Tuckerf7288d72009-06-21 18:12:20 +10001877 (active_state->p_send.packets > MAX_PACKETS) ||
1878 (active_state->p_read.packets > MAX_PACKETS) ||
1879 (active_state->max_blocks_out &&
1880 (active_state->p_send.blocks > active_state->max_blocks_out)) ||
1881 (active_state->max_blocks_in &&
1882 (active_state->p_read.blocks > active_state->max_blocks_in));
Damien Millera5539d22003-04-09 20:50:06 +10001883}
1884
1885void
1886packet_set_rekey_limit(u_int32_t bytes)
1887{
Darren Tuckerf7288d72009-06-21 18:12:20 +10001888 active_state->rekey_limit = bytes;
Damien Millera5539d22003-04-09 20:50:06 +10001889}
Damien Miller9786e6e2005-07-26 21:54:56 +10001890
1891void
1892packet_set_server(void)
1893{
Darren Tuckerf7288d72009-06-21 18:12:20 +10001894 active_state->server_side = 1;
Damien Miller9786e6e2005-07-26 21:54:56 +10001895}
1896
1897void
1898packet_set_authenticated(void)
1899{
Darren Tuckerf7288d72009-06-21 18:12:20 +10001900 active_state->after_authentication = 1;
1901}
1902
1903void *
1904packet_get_input(void)
1905{
1906 return (void *)&active_state->input;
1907}
1908
1909void *
1910packet_get_output(void)
1911{
1912 return (void *)&active_state->output;
1913}
1914
1915void *
1916packet_get_newkeys(int mode)
1917{
1918 return (void *)active_state->newkeys[mode];
Damien Miller9786e6e2005-07-26 21:54:56 +10001919}
Darren Tuckere841eb02009-07-06 07:11:13 +10001920
1921/*
1922 * Save the state for the real connection, and use a separate state when
1923 * resuming a suspended connection.
1924 */
1925void
1926packet_backup_state(void)
1927{
1928 struct session_state *tmp;
1929
1930 close(active_state->connection_in);
1931 active_state->connection_in = -1;
1932 close(active_state->connection_out);
1933 active_state->connection_out = -1;
1934 if (backup_state)
1935 tmp = backup_state;
1936 else
1937 tmp = alloc_session_state();
1938 backup_state = active_state;
1939 active_state = tmp;
1940}
1941
1942/*
1943 * Swap in the old state when resuming a connecion.
1944 */
1945void
1946packet_restore_state(void)
1947{
1948 struct session_state *tmp;
1949 void *buf;
1950 u_int len;
1951
1952 tmp = backup_state;
1953 backup_state = active_state;
1954 active_state = tmp;
1955 active_state->connection_in = backup_state->connection_in;
1956 backup_state->connection_in = -1;
1957 active_state->connection_out = backup_state->connection_out;
1958 backup_state->connection_out = -1;
1959 len = buffer_len(&backup_state->input);
1960 if (len > 0) {
1961 buf = buffer_ptr(&backup_state->input);
1962 buffer_append(&active_state->input, buf, len);
1963 buffer_clear(&backup_state->input);
1964 add_recv_bytes(len);
1965 }
1966}