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