Annotation of src/usr.bin/ssh/packet.c, Revision 1.207
1.206 jsg 1: /* $OpenBSD: packet.c,v 1.205 2015/01/30 01:13:33 djm Exp $ */
1.1 deraadt 2: /*
1.15 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
1.35 deraadt 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.
1.29 markus 8: *
1.35 deraadt 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".
1.29 markus 14: *
1.25 markus 15: *
16: * SSH2 packet format added by Markus Friedl.
1.69 markus 17: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
1.25 markus 18: *
1.35 deraadt 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.
1.15 deraadt 38: */
1.1 deraadt 39:
1.203 deraadt 40: #include <sys/param.h> /* MIN roundup */
1.142 deraadt 41: #include <sys/types.h>
1.105 markus 42: #include <sys/queue.h>
1.132 stevesk 43: #include <sys/socket.h>
1.138 stevesk 44: #include <sys/time.h>
1.132 stevesk 45: #include <netinet/in.h>
1.121 stevesk 46: #include <netinet/ip.h>
1.134 stevesk 47:
1.135 stevesk 48: #include <errno.h>
1.134 stevesk 49: #include <stdarg.h>
1.141 stevesk 50: #include <stdio.h>
1.140 stevesk 51: #include <stdlib.h>
1.137 stevesk 52: #include <string.h>
1.136 stevesk 53: #include <unistd.h>
1.203 deraadt 54: #include <limits.h>
1.142 deraadt 55: #include <signal.h>
1.184 dtucker 56: #include <time.h>
1.1 deraadt 57:
1.201 markus 58: #include <zlib.h>
59:
60: #include "buffer.h" /* typedefs XXX */
61: #include "key.h" /* typedefs XXX */
62:
1.1 deraadt 63: #include "xmalloc.h"
64: #include "crc32.h"
1.9 dugsong 65: #include "deattack.h"
1.25 markus 66: #include "compat.h"
1.45 markus 67: #include "ssh1.h"
1.25 markus 68: #include "ssh2.h"
1.37 markus 69: #include "cipher.h"
1.201 markus 70: #include "sshkey.h"
1.25 markus 71: #include "kex.h"
1.200 markus 72: #include "digest.h"
1.50 markus 73: #include "mac.h"
1.46 markus 74: #include "log.h"
75: #include "canohost.h"
1.87 stevesk 76: #include "misc.h"
1.198 millert 77: #include "channels.h"
1.95 markus 78: #include "ssh.h"
1.201 markus 79: #include "packet.h"
80: #include "roaming.h"
1.197 djm 81: #include "ssherr.h"
1.201 markus 82: #include "sshbuf.h"
1.25 markus 83:
84: #ifdef PACKET_DEBUG
85: #define DBG(x) x
86: #else
87: #define DBG(x)
88: #endif
89:
1.159 markus 90: #define PACKET_MAX_SIZE (256 * 1024)
91:
1.161 andreas 92: struct packet_state {
93: u_int32_t seqnr;
94: u_int32_t packets;
95: u_int64_t blocks;
96: u_int64_t bytes;
97: };
98:
99: struct packet {
100: TAILQ_ENTRY(packet) next;
101: u_char type;
1.201 markus 102: struct sshbuf *payload;
1.161 andreas 103: };
104:
105: struct session_state {
106: /*
107: * This variable contains the file descriptors used for
108: * communicating with the other side. connection_in is used for
109: * reading; connection_out for writing. These can be the same
110: * descriptor, in which case it is assumed to be a socket.
111: */
112: int connection_in;
113: int connection_out;
114:
115: /* Protocol flags for the remote side. */
116: u_int remote_protocol_flags;
1.1 deraadt 117:
1.161 andreas 118: /* Encryption context for receiving data. Only used for decryption. */
1.201 markus 119: struct sshcipher_ctx receive_context;
1.1 deraadt 120:
1.161 andreas 121: /* Encryption context for sending data. Only used for encryption. */
1.201 markus 122: struct sshcipher_ctx send_context;
1.14 markus 123:
1.161 andreas 124: /* Buffer for raw input data from the socket. */
1.201 markus 125: struct sshbuf *input;
1.1 deraadt 126:
1.161 andreas 127: /* Buffer for raw output data going to the socket. */
1.201 markus 128: struct sshbuf *output;
1.1 deraadt 129:
1.161 andreas 130: /* Buffer for the partial outgoing packet being constructed. */
1.201 markus 131: struct sshbuf *outgoing_packet;
1.1 deraadt 132:
1.161 andreas 133: /* Buffer for the incoming packet currently being processed. */
1.201 markus 134: struct sshbuf *incoming_packet;
1.1 deraadt 135:
1.161 andreas 136: /* Scratch buffer for packet compression/decompression. */
1.201 markus 137: struct sshbuf *compression_buffer;
138:
139: /* Incoming/outgoing compression dictionaries */
140: z_stream compression_in_stream;
141: z_stream compression_out_stream;
142: int compression_in_started;
143: int compression_out_started;
144: int compression_in_failures;
145: int compression_out_failures;
1.1 deraadt 146:
1.161 andreas 147: /*
148: * Flag indicating whether packet compression/decompression is
149: * enabled.
150: */
151: int packet_compression;
1.1 deraadt 152:
1.161 andreas 153: /* default maximum packet size */
154: u_int max_packet_size;
1.1 deraadt 155:
1.161 andreas 156: /* Flag indicating whether this module has been initialized. */
157: int initialized;
1.12 markus 158:
1.161 andreas 159: /* Set to true if the connection is interactive. */
160: int interactive_mode;
1.1 deraadt 161:
1.161 andreas 162: /* Set to true if we are the server side. */
163: int server_side;
1.1 deraadt 164:
1.161 andreas 165: /* Set to true if we are authenticated. */
166: int after_authentication;
1.118 markus 167:
1.161 andreas 168: int keep_alive_timeouts;
1.118 markus 169:
1.161 andreas 170: /* The maximum time that we will wait to send or receive a packet */
171: int packet_timeout_ms;
1.151 dtucker 172:
1.161 andreas 173: /* Session key information for Encryption and MAC */
1.201 markus 174: struct newkeys *newkeys[MODE_MAX];
1.161 andreas 175: struct packet_state p_read, p_send;
1.154 dtucker 176:
1.184 dtucker 177: /* Volume-based rekeying */
1.161 andreas 178: u_int64_t max_blocks_in, max_blocks_out;
179: u_int32_t rekey_limit;
1.105 markus 180:
1.184 dtucker 181: /* Time-based rekeying */
182: time_t rekey_interval; /* how often in seconds */
183: time_t rekey_time; /* time of last rekeying */
184:
1.161 andreas 185: /* Session key for protocol v1 */
186: u_char ssh1_key[SSH_SESSION_KEY_LENGTH];
187: u_int ssh1_keylen;
1.25 markus 188:
1.161 andreas 189: /* roundup current message to extra_pad bytes */
190: u_char extra_pad;
1.95 markus 191:
1.161 andreas 192: /* XXX discard incoming data after MAC error */
193: u_int packet_discard;
1.201 markus 194: struct sshmac *packet_discard_mac;
1.71 markus 195:
1.161 andreas 196: /* Used in packet_read_poll2() */
197: u_int packlen;
1.159 markus 198:
1.165 andreas 199: /* Used in packet_send2 */
200: int rekeying;
201:
202: /* Used in packet_set_interactive */
203: int set_interactive_called;
204:
205: /* Used in packet_set_maxsize */
206: int set_maxsize_called;
207:
1.201 markus 208: /* One-off warning about weak ciphers */
209: int cipher_warning_done;
210:
211: /* SSH1 CRC compensation attack detector */
212: struct deattack_ctx deattack;
213:
1.161 andreas 214: TAILQ_HEAD(, packet) outgoing;
1.105 markus 215: };
1.161 andreas 216:
1.201 markus 217: struct ssh *
218: ssh_alloc_session_state(void)
1.161 andreas 219: {
1.201 markus 220: struct ssh *ssh = NULL;
221: struct session_state *state = NULL;
1.161 andreas 222:
1.201 markus 223: if ((ssh = calloc(1, sizeof(*ssh))) == NULL ||
224: (state = calloc(1, sizeof(*state))) == NULL ||
225: (state->input = sshbuf_new()) == NULL ||
226: (state->output = sshbuf_new()) == NULL ||
227: (state->outgoing_packet = sshbuf_new()) == NULL ||
228: (state->incoming_packet = sshbuf_new()) == NULL)
229: goto fail;
230: TAILQ_INIT(&state->outgoing);
1.202 markus 231: TAILQ_INIT(&ssh->private_keys);
232: TAILQ_INIT(&ssh->public_keys);
1.201 markus 233: state->connection_in = -1;
234: state->connection_out = -1;
235: state->max_packet_size = 32768;
236: state->packet_timeout_ms = -1;
237: state->p_send.packets = state->p_read.packets = 0;
238: state->initialized = 1;
239: /*
240: * ssh_packet_send2() needs to queue packets until
241: * we've done the initial key exchange.
242: */
243: state->rekeying = 1;
244: ssh->state = state;
245: return ssh;
246: fail:
247: if (state) {
248: sshbuf_free(state->input);
249: sshbuf_free(state->output);
250: sshbuf_free(state->incoming_packet);
251: sshbuf_free(state->outgoing_packet);
252: free(state);
253: }
254: free(ssh);
255: return NULL;
1.161 andreas 256: }
1.105 markus 257:
1.16 markus 258: /*
259: * Sets the descriptors used for communication. Disables encryption until
260: * packet_set_encryption_key is called.
261: */
1.201 markus 262: struct ssh *
263: ssh_packet_set_connection(struct ssh *ssh, int fd_in, int fd_out)
1.1 deraadt 264: {
1.201 markus 265: struct session_state *state;
266: const struct sshcipher *none = cipher_by_name("none");
1.197 djm 267: int r;
1.97 deraadt 268:
1.205 djm 269: if (none == NULL) {
270: error("%s: cannot load cipher 'none'", __func__);
271: return NULL;
272: }
1.201 markus 273: if (ssh == NULL)
274: ssh = ssh_alloc_session_state();
1.205 djm 275: if (ssh == NULL) {
276: error("%s: cound not allocate state", __func__);
277: return NULL;
278: }
1.201 markus 279: state = ssh->state;
280: state->connection_in = fd_in;
281: state->connection_out = fd_out;
282: if ((r = cipher_init(&state->send_context, none,
1.197 djm 283: (const u_char *)"", 0, NULL, 0, CIPHER_ENCRYPT)) != 0 ||
1.201 markus 284: (r = cipher_init(&state->receive_context, none,
1.205 djm 285: (const u_char *)"", 0, NULL, 0, CIPHER_DECRYPT)) != 0) {
286: error("%s: cipher_init failed: %s", __func__, ssh_err(r));
287: return NULL;
288: }
1.201 markus 289: state->newkeys[MODE_IN] = state->newkeys[MODE_OUT] = NULL;
290: deattack_init(&state->deattack);
1.207 ! djm 291: /*
! 292: * Cache the IP address of the remote connection for use in error
! 293: * messages that might be generated after the connection has closed.
! 294: */
! 295: (void)ssh_remote_ipaddr(ssh);
1.201 markus 296: return ssh;
1.1 deraadt 297: }
298:
1.154 dtucker 299: void
1.201 markus 300: ssh_packet_set_timeout(struct ssh *ssh, int timeout, int count)
1.154 dtucker 301: {
1.201 markus 302: struct session_state *state = ssh->state;
303:
1.174 djm 304: if (timeout <= 0 || count <= 0) {
1.201 markus 305: state->packet_timeout_ms = -1;
1.154 dtucker 306: return;
307: }
308: if ((INT_MAX / 1000) / count < timeout)
1.201 markus 309: state->packet_timeout_ms = INT_MAX;
1.154 dtucker 310: else
1.201 markus 311: state->packet_timeout_ms = timeout * count * 1000;
1.154 dtucker 312: }
313:
1.201 markus 314: int
315: ssh_packet_stop_discard(struct ssh *ssh)
1.159 markus 316: {
1.201 markus 317: struct session_state *state = ssh->state;
318: int r;
319:
320: if (state->packet_discard_mac) {
1.159 markus 321: char buf[1024];
1.201 markus 322:
1.159 markus 323: memset(buf, 'a', sizeof(buf));
1.201 markus 324: while (sshbuf_len(state->incoming_packet) <
1.161 andreas 325: PACKET_MAX_SIZE)
1.201 markus 326: if ((r = sshbuf_put(state->incoming_packet, buf,
327: sizeof(buf))) != 0)
328: return r;
329: (void) mac_compute(state->packet_discard_mac,
330: state->p_read.seqnr,
331: sshbuf_ptr(state->incoming_packet), PACKET_MAX_SIZE,
332: NULL, 0);
1.159 markus 333: }
1.201 markus 334: logit("Finished discarding for %.200s", ssh_remote_ipaddr(ssh));
335: return SSH_ERR_MAC_INVALID;
1.159 markus 336: }
337:
1.201 markus 338: static int
339: ssh_packet_start_discard(struct ssh *ssh, struct sshenc *enc,
340: struct sshmac *mac, u_int packet_length, u_int discard)
1.159 markus 341: {
1.201 markus 342: struct session_state *state = ssh->state;
343: int r;
344:
345: if (enc == NULL || !cipher_is_cbc(enc->cipher) || (mac && mac->etm)) {
346: if ((r = sshpkt_disconnect(ssh, "Packet corrupt")) != 0)
347: return r;
348: return SSH_ERR_MAC_INVALID;
349: }
1.159 markus 350: if (packet_length != PACKET_MAX_SIZE && mac && mac->enabled)
1.201 markus 351: state->packet_discard_mac = mac;
352: if (sshbuf_len(state->input) >= discard &&
353: (r = ssh_packet_stop_discard(ssh)) != 0)
354: return r;
355: state->packet_discard = discard - sshbuf_len(state->input);
356: return 0;
1.159 markus 357: }
358:
1.19 markus 359: /* Returns 1 if remote host is connected via socket, 0 if not. */
360:
361: int
1.201 markus 362: ssh_packet_connection_is_on_socket(struct ssh *ssh)
1.19 markus 363: {
1.201 markus 364: struct session_state *state = ssh->state;
1.19 markus 365: struct sockaddr_storage from, to;
366: socklen_t fromlen, tolen;
367:
368: /* filedescriptors in and out are the same, so it's a socket */
1.201 markus 369: if (state->connection_in == state->connection_out)
1.19 markus 370: return 1;
371: fromlen = sizeof(from);
372: memset(&from, 0, sizeof(from));
1.201 markus 373: if (getpeername(state->connection_in, (struct sockaddr *)&from,
1.161 andreas 374: &fromlen) < 0)
1.19 markus 375: return 0;
376: tolen = sizeof(to);
377: memset(&to, 0, sizeof(to));
1.201 markus 378: if (getpeername(state->connection_out, (struct sockaddr *)&to,
1.161 andreas 379: &tolen) < 0)
1.19 markus 380: return 0;
381: if (fromlen != tolen || memcmp(&from, &to, fromlen) != 0)
382: return 0;
383: if (from.ss_family != AF_INET && from.ss_family != AF_INET6)
384: return 0;
385: return 1;
386: }
387:
1.91 markus 388: void
1.201 markus 389: ssh_packet_get_bytes(struct ssh *ssh, u_int64_t *ibytes, u_int64_t *obytes)
1.91 markus 390: {
1.201 markus 391: if (ibytes)
392: *ibytes = ssh->state->p_read.bytes;
393: if (obytes)
394: *obytes = ssh->state->p_send.bytes;
1.91 markus 395: }
1.125 deraadt 396:
1.91 markus 397: int
1.201 markus 398: ssh_packet_connection_af(struct ssh *ssh)
1.19 markus 399: {
400: struct sockaddr_storage to;
1.21 deraadt 401: socklen_t tolen = sizeof(to);
1.19 markus 402:
403: memset(&to, 0, sizeof(to));
1.201 markus 404: if (getsockname(ssh->state->connection_out, (struct sockaddr *)&to,
1.161 andreas 405: &tolen) < 0)
1.19 markus 406: return 0;
1.173 djm 407: return to.ss_family;
1.19 markus 408: }
409:
1.1 deraadt 410: /* Sets the connection into non-blocking mode. */
411:
1.2 provos 412: void
1.201 markus 413: ssh_packet_set_nonblocking(struct ssh *ssh)
1.1 deraadt 414: {
1.14 markus 415: /* Set the socket into non-blocking mode. */
1.201 markus 416: set_nonblock(ssh->state->connection_in);
1.14 markus 417:
1.201 markus 418: if (ssh->state->connection_out != ssh->state->connection_in)
419: set_nonblock(ssh->state->connection_out);
1.1 deraadt 420: }
421:
422: /* Returns the socket used for reading. */
423:
1.2 provos 424: int
1.201 markus 425: ssh_packet_get_connection_in(struct ssh *ssh)
1.1 deraadt 426: {
1.201 markus 427: return ssh->state->connection_in;
1.1 deraadt 428: }
429:
430: /* Returns the descriptor used for writing. */
431:
1.2 provos 432: int
1.201 markus 433: ssh_packet_get_connection_out(struct ssh *ssh)
1.1 deraadt 434: {
1.201 markus 435: return ssh->state->connection_out;
436: }
437:
438: /*
439: * Returns the IP-address of the remote host as a string. The returned
440: * string must not be freed.
441: */
442:
443: const char *
444: ssh_remote_ipaddr(struct ssh *ssh)
445: {
446: /* Check whether we have cached the ipaddr. */
447: if (ssh->remote_ipaddr == NULL)
448: ssh->remote_ipaddr = ssh_packet_connection_is_on_socket(ssh) ?
449: get_peer_ipaddr(ssh->state->connection_in) :
450: strdup("UNKNOWN");
451: if (ssh->remote_ipaddr == NULL)
452: return "UNKNOWN";
453: return ssh->remote_ipaddr;
1.1 deraadt 454: }
455:
456: /* Closes the connection and clears and frees internal data structures. */
457:
1.2 provos 458: void
1.201 markus 459: ssh_packet_close(struct ssh *ssh)
1.1 deraadt 460: {
1.201 markus 461: struct session_state *state = ssh->state;
462: int r;
463: u_int mode;
464:
465: if (!state->initialized)
1.14 markus 466: return;
1.201 markus 467: state->initialized = 0;
468: if (state->connection_in == state->connection_out) {
469: shutdown(state->connection_out, SHUT_RDWR);
470: close(state->connection_out);
1.14 markus 471: } else {
1.201 markus 472: close(state->connection_in);
473: close(state->connection_out);
1.14 markus 474: }
1.201 markus 475: sshbuf_free(state->input);
476: sshbuf_free(state->output);
477: sshbuf_free(state->outgoing_packet);
478: sshbuf_free(state->incoming_packet);
479: for (mode = 0; mode < MODE_MAX; mode++)
480: kex_free_newkeys(state->newkeys[mode]);
481: if (state->compression_buffer) {
482: sshbuf_free(state->compression_buffer);
483: if (state->compression_out_started) {
484: z_streamp stream = &state->compression_out_stream;
485: debug("compress outgoing: "
486: "raw data %llu, compressed %llu, factor %.2f",
487: (unsigned long long)stream->total_in,
488: (unsigned long long)stream->total_out,
489: stream->total_in == 0 ? 0.0 :
490: (double) stream->total_out / stream->total_in);
491: if (state->compression_out_failures == 0)
492: deflateEnd(stream);
493: }
494: if (state->compression_in_started) {
495: z_streamp stream = &state->compression_out_stream;
496: debug("compress incoming: "
497: "raw data %llu, compressed %llu, factor %.2f",
498: (unsigned long long)stream->total_out,
499: (unsigned long long)stream->total_in,
500: stream->total_out == 0 ? 0.0 :
501: (double) stream->total_in / stream->total_out);
502: if (state->compression_in_failures == 0)
503: inflateEnd(stream);
504: }
1.14 markus 505: }
1.201 markus 506: if ((r = cipher_cleanup(&state->send_context)) != 0)
507: error("%s: cipher_cleanup failed: %s", __func__, ssh_err(r));
508: if ((r = cipher_cleanup(&state->receive_context)) != 0)
509: error("%s: cipher_cleanup failed: %s", __func__, ssh_err(r));
510: if (ssh->remote_ipaddr) {
511: free(ssh->remote_ipaddr);
512: ssh->remote_ipaddr = NULL;
513: }
514: free(ssh->state);
515: ssh->state = NULL;
1.1 deraadt 516: }
517:
518: /* Sets remote side protocol flags. */
519:
1.2 provos 520: void
1.201 markus 521: ssh_packet_set_protocol_flags(struct ssh *ssh, u_int protocol_flags)
1.1 deraadt 522: {
1.201 markus 523: ssh->state->remote_protocol_flags = protocol_flags;
1.1 deraadt 524: }
525:
526: /* Returns the remote protocol flags set earlier by the above function. */
527:
1.40 markus 528: u_int
1.201 markus 529: ssh_packet_get_protocol_flags(struct ssh *ssh)
1.1 deraadt 530: {
1.201 markus 531: return ssh->state->remote_protocol_flags;
1.1 deraadt 532: }
533:
1.16 markus 534: /*
535: * Starts packet compression from the next packet on in both directions.
536: * Level is compression level 1 (fastest) - 9 (slow, best) as in gzip.
537: */
1.1 deraadt 538:
1.201 markus 539: static int
540: ssh_packet_init_compression(struct ssh *ssh)
1.60 markus 541: {
1.201 markus 542: if (!ssh->state->compression_buffer &&
543: ((ssh->state->compression_buffer = sshbuf_new()) == NULL))
544: return SSH_ERR_ALLOC_FAIL;
545: return 0;
1.60 markus 546: }
547:
1.201 markus 548: static int
549: start_compression_out(struct ssh *ssh, int level)
1.1 deraadt 550: {
1.201 markus 551: if (level < 1 || level > 9)
552: return SSH_ERR_INVALID_ARGUMENT;
553: debug("Enabling compression at level %d.", level);
554: if (ssh->state->compression_out_started == 1)
555: deflateEnd(&ssh->state->compression_out_stream);
556: switch (deflateInit(&ssh->state->compression_out_stream, level)) {
557: case Z_OK:
558: ssh->state->compression_out_started = 1;
559: break;
560: case Z_MEM_ERROR:
561: return SSH_ERR_ALLOC_FAIL;
562: default:
563: return SSH_ERR_INTERNAL_ERROR;
564: }
565: return 0;
1.1 deraadt 566: }
567:
1.201 markus 568: static int
569: start_compression_in(struct ssh *ssh)
570: {
571: if (ssh->state->compression_in_started == 1)
572: inflateEnd(&ssh->state->compression_in_stream);
573: switch (inflateInit(&ssh->state->compression_in_stream)) {
574: case Z_OK:
575: ssh->state->compression_in_started = 1;
576: break;
577: case Z_MEM_ERROR:
578: return SSH_ERR_ALLOC_FAIL;
579: default:
580: return SSH_ERR_INTERNAL_ERROR;
581: }
582: return 0;
583: }
1.95 markus 584:
1.201 markus 585: int
586: ssh_packet_start_compression(struct ssh *ssh, int level)
1.1 deraadt 587: {
1.197 djm 588: int r;
1.97 deraadt 589:
1.201 markus 590: if (ssh->state->packet_compression && !compat20)
591: return SSH_ERR_INTERNAL_ERROR;
592: ssh->state->packet_compression = 1;
593: if ((r = ssh_packet_init_compression(ssh)) != 0 ||
594: (r = start_compression_in(ssh)) != 0 ||
595: (r = start_compression_out(ssh, level)) != 0)
596: return r;
597: return 0;
1.95 markus 598: }
599:
1.201 markus 600: /* XXX remove need for separate compression buffer */
601: static int
602: compress_buffer(struct ssh *ssh, struct sshbuf *in, struct sshbuf *out)
1.95 markus 603: {
1.201 markus 604: u_char buf[4096];
605: int r, status;
606:
607: if (ssh->state->compression_out_started != 1)
608: return SSH_ERR_INTERNAL_ERROR;
609:
610: /* This case is not handled below. */
611: if (sshbuf_len(in) == 0)
612: return 0;
613:
614: /* Input is the contents of the input buffer. */
615: if ((ssh->state->compression_out_stream.next_in =
616: sshbuf_mutable_ptr(in)) == NULL)
617: return SSH_ERR_INTERNAL_ERROR;
618: ssh->state->compression_out_stream.avail_in = sshbuf_len(in);
619:
620: /* Loop compressing until deflate() returns with avail_out != 0. */
621: do {
622: /* Set up fixed-size output buffer. */
623: ssh->state->compression_out_stream.next_out = buf;
624: ssh->state->compression_out_stream.avail_out = sizeof(buf);
625:
626: /* Compress as much data into the buffer as possible. */
627: status = deflate(&ssh->state->compression_out_stream,
628: Z_PARTIAL_FLUSH);
629: switch (status) {
630: case Z_MEM_ERROR:
631: return SSH_ERR_ALLOC_FAIL;
632: case Z_OK:
633: /* Append compressed data to output_buffer. */
634: if ((r = sshbuf_put(out, buf, sizeof(buf) -
635: ssh->state->compression_out_stream.avail_out)) != 0)
636: return r;
637: break;
638: case Z_STREAM_ERROR:
639: default:
640: ssh->state->compression_out_failures++;
641: return SSH_ERR_INVALID_FORMAT;
642: }
643: } while (ssh->state->compression_out_stream.avail_out == 0);
644: return 0;
1.1 deraadt 645: }
646:
1.201 markus 647: static int
648: uncompress_buffer(struct ssh *ssh, struct sshbuf *in, struct sshbuf *out)
1.1 deraadt 649: {
1.201 markus 650: u_char buf[4096];
651: int r, status;
1.1 deraadt 652:
1.201 markus 653: if (ssh->state->compression_in_started != 1)
654: return SSH_ERR_INTERNAL_ERROR;
1.25 markus 655:
1.201 markus 656: if ((ssh->state->compression_in_stream.next_in =
657: sshbuf_mutable_ptr(in)) == NULL)
658: return SSH_ERR_INTERNAL_ERROR;
659: ssh->state->compression_in_stream.avail_in = sshbuf_len(in);
1.97 deraadt 660:
1.201 markus 661: for (;;) {
662: /* Set up fixed-size output buffer. */
663: ssh->state->compression_in_stream.next_out = buf;
664: ssh->state->compression_in_stream.avail_out = sizeof(buf);
665:
666: status = inflate(&ssh->state->compression_in_stream,
667: Z_PARTIAL_FLUSH);
668: switch (status) {
669: case Z_OK:
670: if ((r = sshbuf_put(out, buf, sizeof(buf) -
671: ssh->state->compression_in_stream.avail_out)) != 0)
672: return r;
673: break;
674: case Z_BUF_ERROR:
675: /*
676: * Comments in zlib.h say that we should keep calling
677: * inflate() until we get an error. This appears to
678: * be the error that we get.
679: */
680: return 0;
681: case Z_DATA_ERROR:
682: return SSH_ERR_INVALID_FORMAT;
683: case Z_MEM_ERROR:
684: return SSH_ERR_ALLOC_FAIL;
685: case Z_STREAM_ERROR:
686: default:
687: ssh->state->compression_in_failures++;
688: return SSH_ERR_INTERNAL_ERROR;
689: }
690: }
691: /* NOTREACHED */
1.1 deraadt 692: }
1.125 deraadt 693:
1.201 markus 694: /* Serialise compression state into a blob for privsep */
695: static int
696: ssh_packet_get_compress_state(struct sshbuf *m, struct ssh *ssh)
1.1 deraadt 697: {
1.201 markus 698: struct session_state *state = ssh->state;
699: struct sshbuf *b;
700: int r;
701:
702: if ((b = sshbuf_new()) == NULL)
703: return SSH_ERR_ALLOC_FAIL;
704: if (state->compression_in_started) {
705: if ((r = sshbuf_put_string(b, &state->compression_in_stream,
706: sizeof(state->compression_in_stream))) != 0)
707: goto out;
708: } else if ((r = sshbuf_put_string(b, NULL, 0)) != 0)
709: goto out;
710: if (state->compression_out_started) {
711: if ((r = sshbuf_put_string(b, &state->compression_out_stream,
712: sizeof(state->compression_out_stream))) != 0)
713: goto out;
714: } else if ((r = sshbuf_put_string(b, NULL, 0)) != 0)
715: goto out;
716: r = sshbuf_put_stringb(m, b);
717: out:
718: sshbuf_free(b);
719: return r;
1.1 deraadt 720: }
1.125 deraadt 721:
1.201 markus 722: /* Deserialise compression state from a blob for privsep */
723: static int
724: ssh_packet_set_compress_state(struct ssh *ssh, struct sshbuf *m)
1.162 andreas 725: {
1.201 markus 726: struct session_state *state = ssh->state;
727: struct sshbuf *b = NULL;
728: int r;
729: const u_char *inblob, *outblob;
730: size_t inl, outl;
1.162 andreas 731:
1.201 markus 732: if ((r = sshbuf_froms(m, &b)) != 0)
733: goto out;
734: if ((r = sshbuf_get_string_direct(b, &inblob, &inl)) != 0 ||
735: (r = sshbuf_get_string_direct(b, &outblob, &outl)) != 0)
736: goto out;
737: if (inl == 0)
738: state->compression_in_started = 0;
739: else if (inl != sizeof(state->compression_in_stream)) {
740: r = SSH_ERR_INTERNAL_ERROR;
741: goto out;
742: } else {
743: state->compression_in_started = 1;
744: memcpy(&state->compression_in_stream, inblob, inl);
745: }
746: if (outl == 0)
747: state->compression_out_started = 0;
748: else if (outl != sizeof(state->compression_out_stream)) {
749: r = SSH_ERR_INTERNAL_ERROR;
750: goto out;
751: } else {
752: state->compression_out_started = 1;
753: memcpy(&state->compression_out_stream, outblob, outl);
754: }
755: r = 0;
756: out:
757: sshbuf_free(b);
758: return r;
1.1 deraadt 759: }
1.125 deraadt 760:
1.24 markus 761: void
1.201 markus 762: ssh_packet_set_compress_hooks(struct ssh *ssh, void *ctx,
763: void *(*allocfunc)(void *, u_int, u_int),
764: void (*freefunc)(void *, void *))
765: {
766: ssh->state->compression_out_stream.zalloc = (alloc_func)allocfunc;
767: ssh->state->compression_out_stream.zfree = (free_func)freefunc;
768: ssh->state->compression_out_stream.opaque = ctx;
769: ssh->state->compression_in_stream.zalloc = (alloc_func)allocfunc;
770: ssh->state->compression_in_stream.zfree = (free_func)freefunc;
771: ssh->state->compression_in_stream.opaque = ctx;
1.24 markus 772: }
1.125 deraadt 773:
1.201 markus 774: /*
775: * Causes any further packets to be encrypted using the given key. The same
776: * key is used for both sending and reception. However, both directions are
777: * encrypted independently of each other.
778: */
1.125 deraadt 779:
1.195 markus 780: #ifdef WITH_OPENSSL
1.2 provos 781: void
1.201 markus 782: ssh_packet_set_encryption_key(struct ssh *ssh, const u_char *key, u_int keylen, int number)
1.1 deraadt 783: {
1.201 markus 784: struct session_state *state = ssh->state;
785: const struct sshcipher *cipher = cipher_by_number(number);
786: int r;
787: const char *wmsg;
1.125 deraadt 788:
1.201 markus 789: if (cipher == NULL)
790: fatal("%s: unknown cipher number %d", __func__, number);
791: if (keylen < 20)
792: fatal("%s: keylen too small: %d", __func__, keylen);
793: if (keylen > SSH_SESSION_KEY_LENGTH)
794: fatal("%s: keylen too big: %d", __func__, keylen);
795: memcpy(state->ssh1_key, key, keylen);
796: state->ssh1_keylen = keylen;
797: if ((r = cipher_init(&state->send_context, cipher, key, keylen,
798: NULL, 0, CIPHER_ENCRYPT)) != 0 ||
799: (r = cipher_init(&state->receive_context, cipher, key, keylen,
800: NULL, 0, CIPHER_DECRYPT) != 0))
801: fatal("%s: cipher_init failed: %s", __func__, ssh_err(r));
802: if (!state->cipher_warning_done &&
803: ((wmsg = cipher_warning_message(&state->send_context)) != NULL ||
804: (wmsg = cipher_warning_message(&state->send_context)) != NULL)) {
805: error("Warning: %s", wmsg);
806: state->cipher_warning_done = 1;
807: }
1.170 djm 808: }
1.195 markus 809: #endif
1.170 djm 810:
1.16 markus 811: /*
812: * Finalizes and sends the packet. If the encryption key has been set,
813: * encrypts the packet before sending.
814: */
1.14 markus 815:
1.201 markus 816: int
817: ssh_packet_send1(struct ssh *ssh)
1.1 deraadt 818: {
1.201 markus 819: struct session_state *state = ssh->state;
1.89 markus 820: u_char buf[8], *cp;
1.201 markus 821: int r, padding, len;
1.40 markus 822: u_int checksum;
1.14 markus 823:
1.16 markus 824: /*
825: * If using packet compression, compress the payload of the outgoing
826: * packet.
827: */
1.201 markus 828: if (state->packet_compression) {
829: sshbuf_reset(state->compression_buffer);
1.14 markus 830: /* Skip padding. */
1.201 markus 831: if ((r = sshbuf_consume(state->outgoing_packet, 8)) != 0)
832: goto out;
1.14 markus 833: /* padding */
1.201 markus 834: if ((r = sshbuf_put(state->compression_buffer,
835: "\0\0\0\0\0\0\0\0", 8)) != 0)
836: goto out;
837: if ((r = compress_buffer(ssh, state->outgoing_packet,
838: state->compression_buffer)) != 0)
839: goto out;
840: sshbuf_reset(state->outgoing_packet);
841: if ((r = sshbuf_putb(state->outgoing_packet,
842: state->compression_buffer)) != 0)
843: goto out;
1.14 markus 844: }
845: /* Compute packet length without padding (add checksum, remove padding). */
1.201 markus 846: len = sshbuf_len(state->outgoing_packet) + 4 - 8;
1.14 markus 847:
1.32 markus 848: /* Insert padding. Initialized to zero in packet_start1() */
1.14 markus 849: padding = 8 - len % 8;
1.201 markus 850: if (!state->send_context.plaintext) {
851: cp = sshbuf_mutable_ptr(state->outgoing_packet);
852: if (cp == NULL) {
853: r = SSH_ERR_INTERNAL_ERROR;
854: goto out;
1.14 markus 855: }
1.201 markus 856: arc4random_buf(cp + 8 - padding, padding);
1.14 markus 857: }
1.201 markus 858: if ((r = sshbuf_consume(state->outgoing_packet, 8 - padding)) != 0)
859: goto out;
1.14 markus 860:
861: /* Add check bytes. */
1.201 markus 862: checksum = ssh_crc32(sshbuf_ptr(state->outgoing_packet),
863: sshbuf_len(state->outgoing_packet));
864: POKE_U32(buf, checksum);
865: if ((r = sshbuf_put(state->outgoing_packet, buf, 4)) != 0)
866: goto out;
1.1 deraadt 867:
868: #ifdef PACKET_DEBUG
1.14 markus 869: fprintf(stderr, "packet_send plain: ");
1.201 markus 870: sshbuf_dump(state->outgoing_packet, stderr);
1.1 deraadt 871: #endif
872:
1.14 markus 873: /* Append to output. */
1.201 markus 874: POKE_U32(buf, len);
875: if ((r = sshbuf_put(state->output, buf, 4)) != 0)
876: goto out;
877: if ((r = sshbuf_reserve(state->output,
878: sshbuf_len(state->outgoing_packet), &cp)) != 0)
879: goto out;
880: if ((r = cipher_crypt(&state->send_context, 0, cp,
881: sshbuf_ptr(state->outgoing_packet),
882: sshbuf_len(state->outgoing_packet), 0, 0)) != 0)
883: goto out;
1.14 markus 884:
1.1 deraadt 885: #ifdef PACKET_DEBUG
1.14 markus 886: fprintf(stderr, "encrypted: ");
1.201 markus 887: sshbuf_dump(state->output, stderr);
1.1 deraadt 888: #endif
1.201 markus 889: state->p_send.packets++;
890: state->p_send.bytes += len +
891: sshbuf_len(state->outgoing_packet);
892: sshbuf_reset(state->outgoing_packet);
1.1 deraadt 893:
1.16 markus 894: /*
1.120 djm 895: * Note that the packet is now only buffered in output. It won't be
1.205 djm 896: * actually sent until ssh_packet_write_wait or ssh_packet_write_poll
897: * is called.
1.16 markus 898: */
1.201 markus 899: r = 0;
900: out:
901: return r;
1.1 deraadt 902: }
903:
1.201 markus 904: int
905: ssh_set_newkeys(struct ssh *ssh, int mode)
1.57 markus 906: {
1.201 markus 907: struct session_state *state = ssh->state;
908: struct sshenc *enc;
909: struct sshmac *mac;
910: struct sshcomp *comp;
911: struct sshcipher_ctx *cc;
1.105 markus 912: u_int64_t *max_blocks;
1.201 markus 913: const char *wmsg;
1.197 djm 914: int r, crypt_type;
1.57 markus 915:
1.100 markus 916: debug2("set_newkeys: mode %d", mode);
1.57 markus 917:
1.88 markus 918: if (mode == MODE_OUT) {
1.201 markus 919: cc = &state->send_context;
1.115 avsm 920: crypt_type = CIPHER_ENCRYPT;
1.201 markus 921: state->p_send.packets = state->p_send.blocks = 0;
922: max_blocks = &state->max_blocks_out;
1.88 markus 923: } else {
1.201 markus 924: cc = &state->receive_context;
1.115 avsm 925: crypt_type = CIPHER_DECRYPT;
1.201 markus 926: state->p_read.packets = state->p_read.blocks = 0;
927: max_blocks = &state->max_blocks_in;
1.88 markus 928: }
1.201 markus 929: if (state->newkeys[mode] != NULL) {
1.100 markus 930: debug("set_newkeys: rekeying");
1.201 markus 931: if ((r = cipher_cleanup(cc)) != 0)
932: return r;
933: enc = &state->newkeys[mode]->enc;
934: mac = &state->newkeys[mode]->mac;
935: comp = &state->newkeys[mode]->comp;
1.148 pvalchev 936: mac_clear(mac);
1.192 djm 937: explicit_bzero(enc->iv, enc->iv_len);
938: explicit_bzero(enc->key, enc->key_len);
939: explicit_bzero(mac->key, mac->key_len);
1.186 djm 940: free(enc->name);
941: free(enc->iv);
942: free(enc->key);
943: free(mac->name);
944: free(mac->key);
945: free(comp->name);
1.201 markus 946: free(state->newkeys[mode]);
1.57 markus 947: }
1.201 markus 948: /* move newkeys from kex to state */
949: if ((state->newkeys[mode] = ssh->kex->newkeys[mode]) == NULL)
950: return SSH_ERR_INTERNAL_ERROR;
951: ssh->kex->newkeys[mode] = NULL;
952: enc = &state->newkeys[mode]->enc;
953: mac = &state->newkeys[mode]->mac;
954: comp = &state->newkeys[mode]->comp;
955: if (cipher_authlen(enc->cipher) == 0) {
956: if ((r = mac_init(mac)) != 0)
957: return r;
958: }
959: mac->enabled = 1;
1.57 markus 960: DBG(debug("cipher_init_context: %d", mode));
1.197 djm 961: if ((r = cipher_init(cc, enc->cipher, enc->key, enc->key_len,
962: enc->iv, enc->iv_len, crypt_type)) != 0)
1.201 markus 963: return r;
964: if (!state->cipher_warning_done &&
965: (wmsg = cipher_warning_message(cc)) != NULL) {
966: error("Warning: %s", wmsg);
967: state->cipher_warning_done = 1;
968: }
1.91 markus 969: /* Deleting the keys does not gain extra security */
1.192 djm 970: /* explicit_bzero(enc->iv, enc->block_size);
971: explicit_bzero(enc->key, enc->key_len);
972: explicit_bzero(mac->key, mac->key_len); */
1.118 markus 973: if ((comp->type == COMP_ZLIB ||
1.161 andreas 974: (comp->type == COMP_DELAYED &&
1.201 markus 975: state->after_authentication)) && comp->enabled == 0) {
976: if ((r = ssh_packet_init_compression(ssh)) < 0)
977: return r;
978: if (mode == MODE_OUT) {
979: if ((r = start_compression_out(ssh, 6)) != 0)
980: return r;
981: } else {
982: if ((r = start_compression_in(ssh)) != 0)
983: return r;
984: }
1.57 markus 985: comp->enabled = 1;
986: }
1.109 markus 987: /*
988: * The 2^(blocksize*2) limit is too expensive for 3DES,
989: * blowfish, etc, so enforce a 1GB limit for small blocksizes.
990: */
991: if (enc->block_size >= 16)
992: *max_blocks = (u_int64_t)1 << (enc->block_size*2);
993: else
994: *max_blocks = ((u_int64_t)1 << 30) / enc->block_size;
1.201 markus 995: if (state->rekey_limit)
1.161 andreas 996: *max_blocks = MIN(*max_blocks,
1.201 markus 997: state->rekey_limit / enc->block_size);
998: return 0;
1.57 markus 999: }
1000:
1.16 markus 1001: /*
1.118 markus 1002: * Delayed compression for SSH2 is enabled after authentication:
1.143 dtucker 1003: * This happens on the server side after a SSH2_MSG_USERAUTH_SUCCESS is sent,
1.118 markus 1004: * and on the client side after a SSH2_MSG_USERAUTH_SUCCESS is received.
1005: */
1.201 markus 1006: static int
1007: ssh_packet_enable_delayed_compress(struct ssh *ssh)
1.118 markus 1008: {
1.201 markus 1009: struct session_state *state = ssh->state;
1010: struct sshcomp *comp = NULL;
1011: int r, mode;
1.118 markus 1012:
1013: /*
1014: * Remember that we are past the authentication step, so rekeying
1015: * with COMP_DELAYED will turn on compression immediately.
1016: */
1.201 markus 1017: state->after_authentication = 1;
1.118 markus 1018: for (mode = 0; mode < MODE_MAX; mode++) {
1.145 markus 1019: /* protocol error: USERAUTH_SUCCESS received before NEWKEYS */
1.201 markus 1020: if (state->newkeys[mode] == NULL)
1.145 markus 1021: continue;
1.201 markus 1022: comp = &state->newkeys[mode]->comp;
1.118 markus 1023: if (comp && !comp->enabled && comp->type == COMP_DELAYED) {
1.201 markus 1024: if ((r = ssh_packet_init_compression(ssh)) != 0)
1025: return r;
1026: if (mode == MODE_OUT) {
1027: if ((r = start_compression_out(ssh, 6)) != 0)
1028: return r;
1029: } else {
1030: if ((r = start_compression_in(ssh)) != 0)
1031: return r;
1032: }
1.118 markus 1033: comp->enabled = 1;
1034: }
1035: }
1.201 markus 1036: return 0;
1.118 markus 1037: }
1038:
1039: /*
1.25 markus 1040: * Finalize packet in SSH2 format (compress, mac, encrypt, enqueue)
1041: */
1.201 markus 1042: int
1043: ssh_packet_send2_wrapped(struct ssh *ssh)
1.25 markus 1044: {
1.201 markus 1045: struct session_state *state = ssh->state;
1.200 markus 1046: u_char type, *cp, macbuf[SSH_DIGEST_MAX_LENGTH];
1.178 markus 1047: u_char padlen, pad = 0;
1.201 markus 1048: u_int authlen = 0, aadlen = 0;
1049: u_int len;
1050: struct sshenc *enc = NULL;
1051: struct sshmac *mac = NULL;
1052: struct sshcomp *comp = NULL;
1053: int r, block_size;
1054:
1055: if (state->newkeys[MODE_OUT] != NULL) {
1056: enc = &state->newkeys[MODE_OUT]->enc;
1057: mac = &state->newkeys[MODE_OUT]->mac;
1058: comp = &state->newkeys[MODE_OUT]->comp;
1.180 markus 1059: /* disable mac for authenticated encryption */
1060: if ((authlen = cipher_authlen(enc->cipher)) != 0)
1061: mac = NULL;
1.25 markus 1062: }
1.88 markus 1063: block_size = enc ? enc->block_size : 8;
1.180 markus 1064: aadlen = (mac && mac->enabled && mac->etm) || authlen ? 4 : 0;
1.25 markus 1065:
1.201 markus 1066: type = (sshbuf_ptr(state->outgoing_packet))[5];
1.25 markus 1067:
1068: #ifdef PACKET_DEBUG
1069: fprintf(stderr, "plain: ");
1.201 markus 1070: sshbuf_dump(state->outgoing_packet, stderr);
1.25 markus 1071: #endif
1072:
1073: if (comp && comp->enabled) {
1.201 markus 1074: len = sshbuf_len(state->outgoing_packet);
1.25 markus 1075: /* skip header, compress only payload */
1.201 markus 1076: if ((r = sshbuf_consume(state->outgoing_packet, 5)) != 0)
1077: goto out;
1078: sshbuf_reset(state->compression_buffer);
1079: if ((r = compress_buffer(ssh, state->outgoing_packet,
1080: state->compression_buffer)) != 0)
1081: goto out;
1082: sshbuf_reset(state->outgoing_packet);
1083: if ((r = sshbuf_put(state->outgoing_packet,
1084: "\0\0\0\0\0", 5)) != 0 ||
1085: (r = sshbuf_putb(state->outgoing_packet,
1086: state->compression_buffer)) != 0)
1087: goto out;
1088: DBG(debug("compression: raw %d compressed %zd", len,
1089: sshbuf_len(state->outgoing_packet)));
1.25 markus 1090: }
1091:
1092: /* sizeof (packet_len + pad_len + payload) */
1.201 markus 1093: len = sshbuf_len(state->outgoing_packet);
1.25 markus 1094:
1095: /*
1096: * calc size of padding, alloc space, get random data,
1097: * minimum padding is 4 bytes
1098: */
1.178 markus 1099: len -= aadlen; /* packet length is not encrypted for EtM modes */
1.25 markus 1100: padlen = block_size - (len % block_size);
1101: if (padlen < 4)
1102: padlen += block_size;
1.201 markus 1103: if (state->extra_pad) {
1.71 markus 1104: /* will wrap if extra_pad+padlen > 255 */
1.201 markus 1105: state->extra_pad =
1106: roundup(state->extra_pad, block_size);
1107: pad = state->extra_pad -
1108: ((len + padlen) % state->extra_pad);
1.193 djm 1109: DBG(debug3("%s: adding %d (len %d padlen %d extra_pad %d)",
1.201 markus 1110: __func__, pad, len, padlen, state->extra_pad));
1.71 markus 1111: padlen += pad;
1.201 markus 1112: state->extra_pad = 0;
1.71 markus 1113: }
1.201 markus 1114: if ((r = sshbuf_reserve(state->outgoing_packet, padlen, &cp)) != 0)
1115: goto out;
1116: if (enc && !state->send_context.plaintext) {
1.32 markus 1117: /* random padding */
1.201 markus 1118: arc4random_buf(cp, padlen);
1.32 markus 1119: } else {
1120: /* clear padding */
1.192 djm 1121: explicit_bzero(cp, padlen);
1.25 markus 1122: }
1.178 markus 1123: /* sizeof (packet_len + pad_len + payload + padding) */
1.201 markus 1124: len = sshbuf_len(state->outgoing_packet);
1125: cp = sshbuf_mutable_ptr(state->outgoing_packet);
1126: if (cp == NULL) {
1127: r = SSH_ERR_INTERNAL_ERROR;
1128: goto out;
1129: }
1.25 markus 1130: /* packet_length includes payload, padding and padding length field */
1.201 markus 1131: POKE_U32(cp, len - 4);
1.89 markus 1132: cp[4] = padlen;
1.178 markus 1133: DBG(debug("send: len %d (includes padlen %d, aadlen %d)",
1134: len, padlen, aadlen));
1.25 markus 1135:
1136: /* compute MAC over seqnr and packet(length fields, payload, padding) */
1.178 markus 1137: if (mac && mac->enabled && !mac->etm) {
1.201 markus 1138: if ((r = mac_compute(mac, state->p_send.seqnr,
1139: sshbuf_ptr(state->outgoing_packet), len,
1.200 markus 1140: macbuf, sizeof(macbuf))) != 0)
1.201 markus 1141: goto out;
1142: DBG(debug("done calc MAC out #%d", state->p_send.seqnr));
1.25 markus 1143: }
1144: /* encrypt packet and append to output buffer. */
1.201 markus 1145: if ((r = sshbuf_reserve(state->output,
1146: sshbuf_len(state->outgoing_packet) + authlen, &cp)) != 0)
1147: goto out;
1148: if ((r = cipher_crypt(&state->send_context, state->p_send.seqnr, cp,
1149: sshbuf_ptr(state->outgoing_packet),
1150: len - aadlen, aadlen, authlen)) != 0)
1151: goto out;
1.25 markus 1152: /* append unencrypted MAC */
1.178 markus 1153: if (mac && mac->enabled) {
1154: if (mac->etm) {
1155: /* EtM: compute mac over aadlen + cipher text */
1.201 markus 1156: if ((r = mac_compute(mac, state->p_send.seqnr,
1157: cp, len, macbuf, sizeof(macbuf))) != 0)
1158: goto out;
1.178 markus 1159: DBG(debug("done calc MAC(EtM) out #%d",
1.201 markus 1160: state->p_send.seqnr));
1.178 markus 1161: }
1.201 markus 1162: if ((r = sshbuf_put(state->output, macbuf, mac->mac_len)) != 0)
1163: goto out;
1.178 markus 1164: }
1.25 markus 1165: #ifdef PACKET_DEBUG
1166: fprintf(stderr, "encrypted: ");
1.201 markus 1167: sshbuf_dump(state->output, stderr);
1.25 markus 1168: #endif
1.29 markus 1169: /* increment sequence number for outgoing packets */
1.201 markus 1170: if (++state->p_send.seqnr == 0)
1.106 itojun 1171: logit("outgoing seqnr wraps around");
1.201 markus 1172: if (++state->p_send.packets == 0)
1173: if (!(ssh->compat & SSH_BUG_NOREKEY))
1174: return SSH_ERR_NEED_REKEY;
1175: state->p_send.blocks += len / block_size;
1176: state->p_send.bytes += len;
1177: sshbuf_reset(state->outgoing_packet);
1.25 markus 1178:
1.57 markus 1179: if (type == SSH2_MSG_NEWKEYS)
1.201 markus 1180: r = ssh_set_newkeys(ssh, MODE_OUT);
1181: else if (type == SSH2_MSG_USERAUTH_SUCCESS && state->server_side)
1182: r = ssh_packet_enable_delayed_compress(ssh);
1183: else
1184: r = 0;
1185: out:
1186: return r;
1.25 markus 1187: }
1188:
1.201 markus 1189: int
1190: ssh_packet_send2(struct ssh *ssh)
1.105 markus 1191: {
1.201 markus 1192: struct session_state *state = ssh->state;
1.105 markus 1193: struct packet *p;
1.201 markus 1194: u_char type;
1195: int r;
1.105 markus 1196:
1.201 markus 1197: type = sshbuf_ptr(state->outgoing_packet)[5];
1.105 markus 1198:
1199: /* during rekeying we can only send key exchange messages */
1.201 markus 1200: if (state->rekeying) {
1.175 markus 1201: if ((type < SSH2_MSG_TRANSPORT_MIN) ||
1202: (type > SSH2_MSG_TRANSPORT_MAX) ||
1203: (type == SSH2_MSG_SERVICE_REQUEST) ||
1204: (type == SSH2_MSG_SERVICE_ACCEPT)) {
1.105 markus 1205: debug("enqueue packet: %u", type);
1.201 markus 1206: p = calloc(1, sizeof(*p));
1207: if (p == NULL)
1208: return SSH_ERR_ALLOC_FAIL;
1.105 markus 1209: p->type = type;
1.201 markus 1210: p->payload = state->outgoing_packet;
1211: TAILQ_INSERT_TAIL(&state->outgoing, p, next);
1212: state->outgoing_packet = sshbuf_new();
1213: if (state->outgoing_packet == NULL)
1214: return SSH_ERR_ALLOC_FAIL;
1215: return 0;
1.105 markus 1216: }
1217: }
1218:
1219: /* rekeying starts with sending KEXINIT */
1220: if (type == SSH2_MSG_KEXINIT)
1.201 markus 1221: state->rekeying = 1;
1.105 markus 1222:
1.201 markus 1223: if ((r = ssh_packet_send2_wrapped(ssh)) != 0)
1224: return r;
1.105 markus 1225:
1226: /* after a NEWKEYS message we can send the complete queue */
1227: if (type == SSH2_MSG_NEWKEYS) {
1.201 markus 1228: state->rekeying = 0;
1229: state->rekey_time = monotime();
1230: while ((p = TAILQ_FIRST(&state->outgoing))) {
1.105 markus 1231: type = p->type;
1232: debug("dequeue packet: %u", type);
1.201 markus 1233: sshbuf_free(state->outgoing_packet);
1234: state->outgoing_packet = p->payload;
1235: TAILQ_REMOVE(&state->outgoing, p, next);
1.186 djm 1236: free(p);
1.201 markus 1237: if ((r = ssh_packet_send2_wrapped(ssh)) != 0)
1238: return r;
1.105 markus 1239: }
1240: }
1.201 markus 1241: return 0;
1.25 markus 1242: }
1243:
1244: /*
1.16 markus 1245: * Waits until a packet has been received, and returns its type. Note that
1246: * no other data is processed until this returns, so this function should not
1247: * be used during the interactive session.
1248: */
1.1 deraadt 1249:
1.2 provos 1250: int
1.201 markus 1251: ssh_packet_read_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
1.1 deraadt 1252: {
1.201 markus 1253: struct session_state *state = ssh->state;
1254: int len, r, ms_remain, cont;
1.56 millert 1255: fd_set *setp;
1.14 markus 1256: char buf[8192];
1.155 deraadt 1257: struct timeval timeout, start, *timeoutp = NULL;
1258:
1.25 markus 1259: DBG(debug("packet_read()"));
1.14 markus 1260:
1.201 markus 1261: setp = (fd_set *)calloc(howmany(state->connection_in + 1,
1.161 andreas 1262: NFDBITS), sizeof(fd_mask));
1.201 markus 1263: if (setp == NULL)
1264: return SSH_ERR_ALLOC_FAIL;
1.56 millert 1265:
1.205 djm 1266: /*
1267: * Since we are blocking, ensure that all written packets have
1268: * been sent.
1269: */
1.207 ! djm 1270: if ((r = ssh_packet_write_wait(ssh)) != 0)
1.205 djm 1271: return r;
1.14 markus 1272:
1273: /* Stay in the loop until we have received a complete packet. */
1274: for (;;) {
1275: /* Try to read a packet from the buffer. */
1.201 markus 1276: r = ssh_packet_read_poll_seqnr(ssh, typep, seqnr_p);
1277: if (r != 0)
1278: break;
1.62 markus 1279: if (!compat20 && (
1.201 markus 1280: *typep == SSH_SMSG_SUCCESS
1281: || *typep == SSH_SMSG_FAILURE
1282: || *typep == SSH_CMSG_EOF
1283: || *typep == SSH_CMSG_EXIT_CONFIRMATION))
1284: if ((r = sshpkt_get_end(ssh)) != 0)
1285: break;
1.14 markus 1286: /* If we got a packet, return it. */
1.201 markus 1287: if (*typep != SSH_MSG_NONE)
1288: break;
1.16 markus 1289: /*
1290: * Otherwise, wait for some data to arrive, add it to the
1291: * buffer, and try again.
1292: */
1.201 markus 1293: memset(setp, 0, howmany(state->connection_in + 1,
1.161 andreas 1294: NFDBITS) * sizeof(fd_mask));
1.201 markus 1295: FD_SET(state->connection_in, setp);
1.16 markus 1296:
1.201 markus 1297: if (state->packet_timeout_ms > 0) {
1298: ms_remain = state->packet_timeout_ms;
1.154 dtucker 1299: timeoutp = &timeout;
1300: }
1.14 markus 1301: /* Wait for some data to arrive. */
1.154 dtucker 1302: for (;;) {
1.201 markus 1303: if (state->packet_timeout_ms != -1) {
1.154 dtucker 1304: ms_to_timeval(&timeout, ms_remain);
1305: gettimeofday(&start, NULL);
1306: }
1.201 markus 1307: if ((r = select(state->connection_in + 1, setp,
1.161 andreas 1308: NULL, NULL, timeoutp)) >= 0)
1.154 dtucker 1309: break;
1.161 andreas 1310: if (errno != EAGAIN && errno != EINTR)
1.154 dtucker 1311: break;
1.201 markus 1312: if (state->packet_timeout_ms == -1)
1.154 dtucker 1313: continue;
1314: ms_subtract_diff(&start, &ms_remain);
1315: if (ms_remain <= 0) {
1.201 markus 1316: r = 0;
1.154 dtucker 1317: break;
1318: }
1319: }
1.204 djm 1320: if (r == 0)
1321: return SSH_ERR_CONN_TIMEOUT;
1.14 markus 1322: /* Read data from the socket. */
1.163 andreas 1323: do {
1324: cont = 0;
1.201 markus 1325: len = roaming_read(state->connection_in, buf,
1.163 andreas 1326: sizeof(buf), &cont);
1327: } while (len == 0 && cont);
1.204 djm 1328: if (len == 0)
1329: return SSH_ERR_CONN_CLOSED;
1.14 markus 1330: if (len < 0)
1.204 djm 1331: return SSH_ERR_SYSTEM_ERROR;
1332:
1.14 markus 1333: /* Append it to the buffer. */
1.204 djm 1334: if ((r = ssh_packet_process_incoming(ssh, buf, len)) != 0)
1335: return r;
1.14 markus 1336: }
1.201 markus 1337: free(setp);
1338: return r;
1.1 deraadt 1339: }
1340:
1.77 djm 1341: int
1.201 markus 1342: ssh_packet_read(struct ssh *ssh)
1.77 djm 1343: {
1.201 markus 1344: u_char type;
1345: int r;
1346:
1347: if ((r = ssh_packet_read_seqnr(ssh, &type, NULL)) != 0)
1348: fatal("%s: %s", __func__, ssh_err(r));
1349: return type;
1.77 djm 1350: }
1351:
1.16 markus 1352: /*
1353: * Waits until a packet has been received, verifies that its type matches
1354: * that given, and gives a fatal error and exits if there is a mismatch.
1355: */
1.1 deraadt 1356:
1.205 djm 1357: int
1358: ssh_packet_read_expect(struct ssh *ssh, u_int expected_type)
1.1 deraadt 1359: {
1.205 djm 1360: int r;
1361: u_char type;
1.1 deraadt 1362:
1.205 djm 1363: if ((r = ssh_packet_read_seqnr(ssh, &type, NULL)) != 0)
1364: return r;
1365: if (type != expected_type) {
1366: if ((r = sshpkt_disconnect(ssh,
1.201 markus 1367: "Protocol error: expected packet type %d, got %d",
1.205 djm 1368: expected_type, type)) != 0)
1369: return r;
1370: return SSH_ERR_PROTOCOL_ERROR;
1371: }
1372: return 0;
1.1 deraadt 1373: }
1374:
1375: /* Checks if a full packet is available in the data received so far via
1.14 markus 1376: * packet_process_incoming. If so, reads the packet; otherwise returns
1377: * SSH_MSG_NONE. This does not wait for data from the connection.
1378: *
1.150 dtucker 1379: * SSH_MSG_DISCONNECT is handled specially here. Also,
1380: * SSH_MSG_IGNORE messages are skipped by this function and are never returned
1381: * to higher levels.
1.14 markus 1382: */
1.1 deraadt 1383:
1.201 markus 1384: int
1385: ssh_packet_read_poll1(struct ssh *ssh, u_char *typep)
1.1 deraadt 1386: {
1.201 markus 1387: struct session_state *state = ssh->state;
1.40 markus 1388: u_int len, padded_len;
1.205 djm 1389: const char *emsg;
1.201 markus 1390: const u_char *cp;
1391: u_char *p;
1.40 markus 1392: u_int checksum, stored_checksum;
1.201 markus 1393: int r;
1394:
1395: *typep = SSH_MSG_NONE;
1.14 markus 1396:
1397: /* Check if input size is less than minimum packet size. */
1.201 markus 1398: if (sshbuf_len(state->input) < 4 + 8)
1399: return 0;
1.14 markus 1400: /* Get length of incoming packet. */
1.201 markus 1401: len = PEEK_U32(sshbuf_ptr(state->input));
1.205 djm 1402: if (len < 1 + 2 + 2 || len > 256 * 1024) {
1403: if ((r = sshpkt_disconnect(ssh, "Bad packet length %u",
1404: len)) != 0)
1405: return r;
1406: return SSH_ERR_CONN_CORRUPT;
1407: }
1.14 markus 1408: padded_len = (len + 8) & ~7;
1409:
1410: /* Check if the packet has been entirely received. */
1.201 markus 1411: if (sshbuf_len(state->input) < 4 + padded_len)
1412: return 0;
1.14 markus 1413:
1414: /* The entire packet is in buffer. */
1415:
1416: /* Consume packet length. */
1.201 markus 1417: if ((r = sshbuf_consume(state->input, 4)) != 0)
1418: goto out;
1.14 markus 1419:
1.62 markus 1420: /*
1421: * Cryptographic attack detector for ssh
1422: * (C)1998 CORE-SDI, Buenos Aires Argentina
1423: * Ariel Futoransky(futo@core-sdi.com)
1424: */
1.201 markus 1425: if (!state->receive_context.plaintext) {
1.205 djm 1426: emsg = NULL;
1.201 markus 1427: switch (detect_attack(&state->deattack,
1428: sshbuf_ptr(state->input), padded_len)) {
1429: case DEATTACK_OK:
1430: break;
1.144 djm 1431: case DEATTACK_DETECTED:
1.205 djm 1432: emsg = "crc32 compensation attack detected";
1433: break;
1.144 djm 1434: case DEATTACK_DOS_DETECTED:
1.205 djm 1435: emsg = "deattack denial of service detected";
1436: break;
1.201 markus 1437: default:
1.205 djm 1438: emsg = "deattack error";
1439: break;
1440: }
1441: if (emsg != NULL) {
1442: error("%s", emsg);
1443: if ((r = sshpkt_disconnect(ssh, "%s", emsg)) != 0 ||
1444: (r = ssh_packet_write_wait(ssh)) != 0)
1445: return r;
1446: return SSH_ERR_CONN_CORRUPT;
1.144 djm 1447: }
1448: }
1.62 markus 1449:
1450: /* Decrypt data to incoming_packet. */
1.201 markus 1451: sshbuf_reset(state->incoming_packet);
1452: if ((r = sshbuf_reserve(state->incoming_packet, padded_len, &p)) != 0)
1453: goto out;
1454: if ((r = cipher_crypt(&state->receive_context, 0, p,
1455: sshbuf_ptr(state->input), padded_len, 0, 0)) != 0)
1456: goto out;
1.62 markus 1457:
1.201 markus 1458: if ((r = sshbuf_consume(state->input, padded_len)) != 0)
1459: goto out;
1.1 deraadt 1460:
1461: #ifdef PACKET_DEBUG
1.14 markus 1462: fprintf(stderr, "read_poll plain: ");
1.201 markus 1463: sshbuf_dump(state->incoming_packet, stderr);
1.1 deraadt 1464: #endif
1465:
1.14 markus 1466: /* Compute packet checksum. */
1.201 markus 1467: checksum = ssh_crc32(sshbuf_ptr(state->incoming_packet),
1468: sshbuf_len(state->incoming_packet) - 4);
1.14 markus 1469:
1470: /* Skip padding. */
1.201 markus 1471: if ((r = sshbuf_consume(state->incoming_packet, 8 - len % 8)) != 0)
1472: goto out;
1.14 markus 1473:
1474: /* Test check bytes. */
1.205 djm 1475: if (len != sshbuf_len(state->incoming_packet)) {
1476: error("%s: len %d != sshbuf_len %zd", __func__,
1.201 markus 1477: len, sshbuf_len(state->incoming_packet));
1.205 djm 1478: if ((r = sshpkt_disconnect(ssh, "invalid packet length")) != 0 ||
1479: (r = ssh_packet_write_wait(ssh)) != 0)
1480: return r;
1481: return SSH_ERR_CONN_CORRUPT;
1482: }
1.14 markus 1483:
1.201 markus 1484: cp = sshbuf_ptr(state->incoming_packet) + len - 4;
1485: stored_checksum = PEEK_U32(cp);
1.205 djm 1486: if (checksum != stored_checksum) {
1487: error("Corrupted check bytes on input");
1488: if ((r = sshpkt_disconnect(ssh, "connection corrupted")) != 0 ||
1489: (r = ssh_packet_write_wait(ssh)) != 0)
1490: return r;
1491: return SSH_ERR_CONN_CORRUPT;
1492: }
1.201 markus 1493: if ((r = sshbuf_consume_end(state->incoming_packet, 4)) < 0)
1494: goto out;
1495:
1496: if (state->packet_compression) {
1497: sshbuf_reset(state->compression_buffer);
1498: if ((r = uncompress_buffer(ssh, state->incoming_packet,
1499: state->compression_buffer)) != 0)
1500: goto out;
1501: sshbuf_reset(state->incoming_packet);
1502: if ((r = sshbuf_putb(state->incoming_packet,
1503: state->compression_buffer)) != 0)
1504: goto out;
1505: }
1506: state->p_read.packets++;
1507: state->p_read.bytes += padded_len + 4;
1508: if ((r = sshbuf_get_u8(state->incoming_packet, typep)) != 0)
1509: goto out;
1.205 djm 1510: if (*typep < SSH_MSG_MIN || *typep > SSH_MSG_MAX) {
1511: error("Invalid ssh1 packet type: %d", *typep);
1512: if ((r = sshpkt_disconnect(ssh, "invalid packet type")) != 0 ||
1513: (r = ssh_packet_write_wait(ssh)) != 0)
1514: return r;
1515: return SSH_ERR_PROTOCOL_ERROR;
1516: }
1.201 markus 1517: r = 0;
1518: out:
1519: return r;
1.1 deraadt 1520: }
1.14 markus 1521:
1.201 markus 1522: int
1523: ssh_packet_read_poll2(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
1.25 markus 1524: {
1.201 markus 1525: struct session_state *state = ssh->state;
1.40 markus 1526: u_int padlen, need;
1.201 markus 1527: u_char *cp, macbuf[SSH_DIGEST_MAX_LENGTH];
1528: u_int maclen, aadlen = 0, authlen = 0, block_size;
1529: struct sshenc *enc = NULL;
1530: struct sshmac *mac = NULL;
1531: struct sshcomp *comp = NULL;
1.200 markus 1532: int r;
1.201 markus 1533:
1534: *typep = SSH_MSG_NONE;
1535:
1536: if (state->packet_discard)
1537: return 0;
1538:
1539: if (state->newkeys[MODE_IN] != NULL) {
1540: enc = &state->newkeys[MODE_IN]->enc;
1541: mac = &state->newkeys[MODE_IN]->mac;
1542: comp = &state->newkeys[MODE_IN]->comp;
1.180 markus 1543: /* disable mac for authenticated encryption */
1544: if ((authlen = cipher_authlen(enc->cipher)) != 0)
1545: mac = NULL;
1.25 markus 1546: }
1547: maclen = mac && mac->enabled ? mac->mac_len : 0;
1.88 markus 1548: block_size = enc ? enc->block_size : 8;
1.180 markus 1549: aadlen = (mac && mac->enabled && mac->etm) || authlen ? 4 : 0;
1.25 markus 1550:
1.201 markus 1551: if (aadlen && state->packlen == 0) {
1552: if (cipher_get_length(&state->receive_context,
1553: &state->packlen, state->p_read.seqnr,
1554: sshbuf_ptr(state->input), sshbuf_len(state->input)) != 0)
1555: return 0;
1556: if (state->packlen < 1 + 4 ||
1557: state->packlen > PACKET_MAX_SIZE) {
1.178 markus 1558: #ifdef PACKET_DEBUG
1.201 markus 1559: sshbuf_dump(state->input, stderr);
1.178 markus 1560: #endif
1.201 markus 1561: logit("Bad packet length %u.", state->packlen);
1562: if ((r = sshpkt_disconnect(ssh, "Packet corrupt")) != 0)
1563: return r;
1.178 markus 1564: }
1.201 markus 1565: sshbuf_reset(state->incoming_packet);
1566: } else if (state->packlen == 0) {
1.25 markus 1567: /*
1568: * check if input size is less than the cipher block size,
1569: * decrypt first block and extract length of incoming packet
1570: */
1.201 markus 1571: if (sshbuf_len(state->input) < block_size)
1572: return 0;
1573: sshbuf_reset(state->incoming_packet);
1574: if ((r = sshbuf_reserve(state->incoming_packet, block_size,
1575: &cp)) != 0)
1576: goto out;
1577: if ((r = cipher_crypt(&state->receive_context,
1578: state->p_send.seqnr, cp, sshbuf_ptr(state->input),
1579: block_size, 0, 0)) != 0)
1580: goto out;
1581: state->packlen = PEEK_U32(sshbuf_ptr(state->incoming_packet));
1582: if (state->packlen < 1 + 4 ||
1583: state->packlen > PACKET_MAX_SIZE) {
1.110 markus 1584: #ifdef PACKET_DEBUG
1.201 markus 1585: fprintf(stderr, "input: \n");
1586: sshbuf_dump(state->input, stderr);
1587: fprintf(stderr, "incoming_packet: \n");
1588: sshbuf_dump(state->incoming_packet, stderr);
1.110 markus 1589: #endif
1.201 markus 1590: logit("Bad packet length %u.", state->packlen);
1591: return ssh_packet_start_discard(ssh, enc, mac,
1592: state->packlen, PACKET_MAX_SIZE);
1.25 markus 1593: }
1.201 markus 1594: if ((r = sshbuf_consume(state->input, block_size)) != 0)
1595: goto out;
1.25 markus 1596: }
1.201 markus 1597: DBG(debug("input: packet len %u", state->packlen+4));
1598:
1.178 markus 1599: if (aadlen) {
1600: /* only the payload is encrypted */
1.201 markus 1601: need = state->packlen;
1.178 markus 1602: } else {
1603: /*
1604: * the payload size and the payload are encrypted, but we
1605: * have a partial packet of block_size bytes
1606: */
1.201 markus 1607: need = 4 + state->packlen - block_size;
1.178 markus 1608: }
1.180 markus 1609: DBG(debug("partial packet: block %d, need %d, maclen %d, authlen %d,"
1610: " aadlen %d", block_size, need, maclen, authlen, aadlen));
1.158 markus 1611: if (need % block_size != 0) {
1612: logit("padding error: need %d block %d mod %d",
1.25 markus 1613: need, block_size, need % block_size);
1.201 markus 1614: return ssh_packet_start_discard(ssh, enc, mac,
1615: state->packlen, PACKET_MAX_SIZE - block_size);
1.158 markus 1616: }
1.25 markus 1617: /*
1618: * check if the entire packet has been received and
1.178 markus 1619: * decrypt into incoming_packet:
1620: * 'aadlen' bytes are unencrypted, but authenticated.
1.180 markus 1621: * 'need' bytes are encrypted, followed by either
1622: * 'authlen' bytes of authentication tag or
1.178 markus 1623: * 'maclen' bytes of message authentication code.
1.25 markus 1624: */
1.201 markus 1625: if (sshbuf_len(state->input) < aadlen + need + authlen + maclen)
1626: return 0;
1.25 markus 1627: #ifdef PACKET_DEBUG
1628: fprintf(stderr, "read_poll enc/full: ");
1.201 markus 1629: sshbuf_dump(state->input, stderr);
1.25 markus 1630: #endif
1.178 markus 1631: /* EtM: compute mac over encrypted input */
1.201 markus 1632: if (mac && mac->enabled && mac->etm) {
1633: if ((r = mac_compute(mac, state->p_read.seqnr,
1634: sshbuf_ptr(state->input), aadlen + need,
1.200 markus 1635: macbuf, sizeof(macbuf))) != 0)
1.201 markus 1636: goto out;
1637: }
1638: if ((r = sshbuf_reserve(state->incoming_packet, aadlen + need,
1639: &cp)) != 0)
1640: goto out;
1641: if ((r = cipher_crypt(&state->receive_context, state->p_read.seqnr, cp,
1642: sshbuf_ptr(state->input), need, aadlen, authlen)) != 0)
1643: goto out;
1644: if ((r = sshbuf_consume(state->input, aadlen + need + authlen)) != 0)
1645: goto out;
1.25 markus 1646: /*
1647: * compute MAC over seqnr and packet,
1648: * increment sequence number for incoming packet
1649: */
1.29 markus 1650: if (mac && mac->enabled) {
1.178 markus 1651: if (!mac->etm)
1.201 markus 1652: if ((r = mac_compute(mac, state->p_read.seqnr,
1653: sshbuf_ptr(state->incoming_packet),
1654: sshbuf_len(state->incoming_packet),
1.200 markus 1655: macbuf, sizeof(macbuf))) != 0)
1.201 markus 1656: goto out;
1657: if (timingsafe_bcmp(macbuf, sshbuf_ptr(state->input),
1.161 andreas 1658: mac->mac_len) != 0) {
1.159 markus 1659: logit("Corrupted MAC on input.");
1660: if (need > PACKET_MAX_SIZE)
1.201 markus 1661: return SSH_ERR_INTERNAL_ERROR;
1662: return ssh_packet_start_discard(ssh, enc, mac,
1663: state->packlen, PACKET_MAX_SIZE - need);
1664: }
1665:
1666: DBG(debug("MAC #%d ok", state->p_read.seqnr));
1667: if ((r = sshbuf_consume(state->input, mac->mac_len)) != 0)
1668: goto out;
1.25 markus 1669: }
1.77 djm 1670: if (seqnr_p != NULL)
1.201 markus 1671: *seqnr_p = state->p_read.seqnr;
1672: if (++state->p_read.seqnr == 0)
1.106 itojun 1673: logit("incoming seqnr wraps around");
1.201 markus 1674: if (++state->p_read.packets == 0)
1675: if (!(ssh->compat & SSH_BUG_NOREKEY))
1676: return SSH_ERR_NEED_REKEY;
1677: state->p_read.blocks += (state->packlen + 4) / block_size;
1678: state->p_read.bytes += state->packlen + 4;
1.25 markus 1679:
1680: /* get padlen */
1.201 markus 1681: padlen = sshbuf_ptr(state->incoming_packet)[4];
1.25 markus 1682: DBG(debug("input: padlen %d", padlen));
1.205 djm 1683: if (padlen < 4) {
1684: if ((r = sshpkt_disconnect(ssh,
1685: "Corrupted padlen %d on input.", padlen)) != 0 ||
1686: (r = ssh_packet_write_wait(ssh)) != 0)
1687: return r;
1688: return SSH_ERR_CONN_CORRUPT;
1689: }
1.25 markus 1690:
1691: /* skip packet size + padlen, discard padding */
1.201 markus 1692: if ((r = sshbuf_consume(state->incoming_packet, 4 + 1)) != 0 ||
1693: ((r = sshbuf_consume_end(state->incoming_packet, padlen)) != 0))
1694: goto out;
1.25 markus 1695:
1.201 markus 1696: DBG(debug("input: len before de-compress %zd",
1697: sshbuf_len(state->incoming_packet)));
1.25 markus 1698: if (comp && comp->enabled) {
1.201 markus 1699: sshbuf_reset(state->compression_buffer);
1700: if ((r = uncompress_buffer(ssh, state->incoming_packet,
1701: state->compression_buffer)) != 0)
1702: goto out;
1703: sshbuf_reset(state->incoming_packet);
1704: if ((r = sshbuf_putb(state->incoming_packet,
1705: state->compression_buffer)) != 0)
1706: goto out;
1707: DBG(debug("input: len after de-compress %zd",
1708: sshbuf_len(state->incoming_packet)));
1.25 markus 1709: }
1710: /*
1711: * get packet type, implies consume.
1712: * return length of payload (without type field)
1713: */
1.201 markus 1714: if ((r = sshbuf_get_u8(state->incoming_packet, typep)) != 0)
1715: goto out;
1.205 djm 1716: if (*typep < SSH2_MSG_MIN || *typep >= SSH2_MSG_LOCAL_MIN) {
1717: if ((r = sshpkt_disconnect(ssh,
1718: "Invalid ssh2 packet type: %d", *typep)) != 0 ||
1719: (r = ssh_packet_write_wait(ssh)) != 0)
1720: return r;
1721: return SSH_ERR_PROTOCOL_ERROR;
1722: }
1.201 markus 1723: if (*typep == SSH2_MSG_NEWKEYS)
1724: r = ssh_set_newkeys(ssh, MODE_IN);
1725: else if (*typep == SSH2_MSG_USERAUTH_SUCCESS && !state->server_side)
1726: r = ssh_packet_enable_delayed_compress(ssh);
1727: else
1728: r = 0;
1.25 markus 1729: #ifdef PACKET_DEBUG
1.201 markus 1730: fprintf(stderr, "read/plain[%d]:\r\n", *typep);
1731: sshbuf_dump(state->incoming_packet, stderr);
1.25 markus 1732: #endif
1.62 markus 1733: /* reset for next packet */
1.201 markus 1734: state->packlen = 0;
1735: out:
1736: return r;
1.25 markus 1737: }
1738:
1739: int
1.201 markus 1740: ssh_packet_read_poll_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
1.25 markus 1741: {
1.201 markus 1742: struct session_state *state = ssh->state;
1.96 deraadt 1743: u_int reason, seqnr;
1.201 markus 1744: int r;
1745: u_char *msg;
1.62 markus 1746:
1.25 markus 1747: for (;;) {
1.201 markus 1748: msg = NULL;
1.62 markus 1749: if (compat20) {
1.201 markus 1750: r = ssh_packet_read_poll2(ssh, typep, seqnr_p);
1751: if (r != 0)
1752: return r;
1753: if (*typep) {
1754: state->keep_alive_timeouts = 0;
1755: DBG(debug("received packet type %d", *typep));
1.153 djm 1756: }
1.201 markus 1757: switch (*typep) {
1.150 dtucker 1758: case SSH2_MSG_IGNORE:
1.151 dtucker 1759: debug3("Received SSH2_MSG_IGNORE");
1.150 dtucker 1760: break;
1.25 markus 1761: case SSH2_MSG_DEBUG:
1.201 markus 1762: if ((r = sshpkt_get_u8(ssh, NULL)) != 0 ||
1763: (r = sshpkt_get_string(ssh, &msg, NULL)) != 0 ||
1764: (r = sshpkt_get_string(ssh, NULL, NULL)) != 0) {
1765: if (msg)
1766: free(msg);
1767: return r;
1768: }
1.25 markus 1769: debug("Remote: %.900s", msg);
1.186 djm 1770: free(msg);
1.25 markus 1771: break;
1772: case SSH2_MSG_DISCONNECT:
1.201 markus 1773: if ((r = sshpkt_get_u32(ssh, &reason)) != 0 ||
1774: (r = sshpkt_get_string(ssh, &msg, NULL)) != 0)
1775: return r;
1.182 djm 1776: /* Ignore normal client exit notifications */
1.201 markus 1777: do_log2(ssh->state->server_side &&
1.182 djm 1778: reason == SSH2_DISCONNECT_BY_APPLICATION ?
1779: SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_ERROR,
1780: "Received disconnect from %s: %u: %.400s",
1.201 markus 1781: ssh_remote_ipaddr(ssh), reason, msg);
1.186 djm 1782: free(msg);
1.201 markus 1783: return SSH_ERR_DISCONNECTED;
1.84 markus 1784: case SSH2_MSG_UNIMPLEMENTED:
1.201 markus 1785: if ((r = sshpkt_get_u32(ssh, &seqnr)) != 0)
1786: return r;
1.96 deraadt 1787: debug("Received SSH2_MSG_UNIMPLEMENTED for %u",
1788: seqnr);
1.150 dtucker 1789: break;
1.25 markus 1790: default:
1.201 markus 1791: return 0;
1.48 stevesk 1792: }
1.25 markus 1793: } else {
1.201 markus 1794: r = ssh_packet_read_poll1(ssh, typep);
1795: switch (*typep) {
1.188 djm 1796: case SSH_MSG_NONE:
1797: return SSH_MSG_NONE;
1.25 markus 1798: case SSH_MSG_IGNORE:
1799: break;
1800: case SSH_MSG_DEBUG:
1.201 markus 1801: if ((r = sshpkt_get_string(ssh, &msg, NULL)) != 0)
1802: return r;
1.25 markus 1803: debug("Remote: %.900s", msg);
1.186 djm 1804: free(msg);
1.25 markus 1805: break;
1806: case SSH_MSG_DISCONNECT:
1.201 markus 1807: if ((r = sshpkt_get_string(ssh, &msg, NULL)) != 0)
1808: return r;
1.181 djm 1809: error("Received disconnect from %s: %.400s",
1.201 markus 1810: ssh_remote_ipaddr(ssh), msg);
1811: free(msg);
1812: return SSH_ERR_DISCONNECTED;
1.25 markus 1813: default:
1.201 markus 1814: DBG(debug("received packet type %d", *typep));
1815: return 0;
1.48 stevesk 1816: }
1.25 markus 1817: }
1818: }
1819: }
1820:
1.16 markus 1821: /*
1822: * Buffers the given amount of input characters. This is intended to be used
1823: * together with packet_read_poll.
1824: */
1.1 deraadt 1825:
1.204 djm 1826: int
1.201 markus 1827: ssh_packet_process_incoming(struct ssh *ssh, const char *buf, u_int len)
1.1 deraadt 1828: {
1.201 markus 1829: struct session_state *state = ssh->state;
1830: int r;
1831:
1832: if (state->packet_discard) {
1833: state->keep_alive_timeouts = 0; /* ?? */
1834: if (len >= state->packet_discard) {
1835: if ((r = ssh_packet_stop_discard(ssh)) != 0)
1.204 djm 1836: return r;
1.201 markus 1837: }
1838: state->packet_discard -= len;
1.204 djm 1839: return 0;
1.159 markus 1840: }
1.201 markus 1841: if ((r = sshbuf_put(ssh->state->input, buf, len)) != 0)
1.204 djm 1842: return r;
1843:
1844: return 0;
1.28 markus 1845: }
1846:
1847: int
1.201 markus 1848: ssh_packet_remaining(struct ssh *ssh)
1.28 markus 1849: {
1.201 markus 1850: return sshbuf_len(ssh->state->incoming_packet);
1.1 deraadt 1851: }
1852:
1.16 markus 1853: /*
1854: * Sends a diagnostic message from the server to the client. This message
1855: * can be sent at any time (but not while constructing another message). The
1856: * message is printed immediately, but only if the client is being executed
1857: * in verbose mode. These messages are primarily intended to ease debugging
1858: * authentication problems. The length of the formatted message must not
1.205 djm 1859: * exceed 1024 bytes. This will automatically call ssh_packet_write_wait.
1.16 markus 1860: */
1.2 provos 1861: void
1.201 markus 1862: ssh_packet_send_debug(struct ssh *ssh, const char *fmt,...)
1.1 deraadt 1863: {
1.14 markus 1864: char buf[1024];
1865: va_list args;
1.201 markus 1866: int r;
1.39 markus 1867:
1.201 markus 1868: if (compat20 && (ssh->compat & SSH_BUG_DEBUG))
1.39 markus 1869: return;
1.14 markus 1870:
1871: va_start(args, fmt);
1872: vsnprintf(buf, sizeof(buf), fmt, args);
1873: va_end(args);
1874:
1.30 markus 1875: if (compat20) {
1.201 markus 1876: if ((r = sshpkt_start(ssh, SSH2_MSG_DEBUG)) != 0 ||
1877: (r = sshpkt_put_u8(ssh, 0)) != 0 || /* always display */
1878: (r = sshpkt_put_cstring(ssh, buf)) != 0 ||
1879: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
1880: (r = sshpkt_send(ssh)) != 0)
1881: fatal("%s: %s", __func__, ssh_err(r));
1.30 markus 1882: } else {
1.201 markus 1883: if ((r = sshpkt_start(ssh, SSH_MSG_DEBUG)) != 0 ||
1884: (r = sshpkt_put_cstring(ssh, buf)) != 0 ||
1885: (r = sshpkt_send(ssh)) != 0)
1886: fatal("%s: %s", __func__, ssh_err(r));
1.30 markus 1887: }
1.205 djm 1888: if ((r = ssh_packet_write_wait(ssh)) != 0)
1889: fatal("%s: %s", __func__, ssh_err(r));
1890: }
1891:
1892: /*
1893: * Pretty-print connection-terminating errors and exit.
1894: */
1895: void
1896: sshpkt_fatal(struct ssh *ssh, const char *tag, int r)
1897: {
1898: switch (r) {
1899: case SSH_ERR_CONN_CLOSED:
1900: logit("Connection closed by %.200s", ssh_remote_ipaddr(ssh));
1901: cleanup_exit(255);
1902: case SSH_ERR_CONN_TIMEOUT:
1903: logit("Connection to %.200s timed out while "
1904: "waiting to write", ssh_remote_ipaddr(ssh));
1905: cleanup_exit(255);
1906: default:
1907: fatal("%s%sConnection to %.200s: %s",
1908: tag != NULL ? tag : "", tag != NULL ? ": " : "",
1909: ssh_remote_ipaddr(ssh), ssh_err(r));
1910: }
1.1 deraadt 1911: }
1912:
1.16 markus 1913: /*
1914: * Logs the error plus constructs and sends a disconnect packet, closes the
1915: * connection, and exits. This function never returns. The error message
1916: * should not contain a newline. The length of the formatted message must
1917: * not exceed 1024 bytes.
1918: */
1.2 provos 1919: void
1.201 markus 1920: ssh_packet_disconnect(struct ssh *ssh, const char *fmt,...)
1.1 deraadt 1921: {
1.14 markus 1922: char buf[1024];
1923: va_list args;
1924: static int disconnecting = 0;
1.201 markus 1925: int r;
1.97 deraadt 1926:
1.14 markus 1927: if (disconnecting) /* Guard against recursive invocations. */
1928: fatal("packet_disconnect called recursively.");
1929: disconnecting = 1;
1930:
1.16 markus 1931: /*
1932: * Format the message. Note that the caller must make sure the
1933: * message is of limited size.
1934: */
1.14 markus 1935: va_start(args, fmt);
1936: vsnprintf(buf, sizeof(buf), fmt, args);
1937: va_end(args);
1938:
1.99 markus 1939: /* Display the error locally */
1.106 itojun 1940: logit("Disconnecting: %.100s", buf);
1.99 markus 1941:
1.205 djm 1942: /*
1943: * Send the disconnect message to the other side, and wait
1944: * for it to get sent.
1945: */
1946: if ((r = sshpkt_disconnect(ssh, "%s", buf)) != 0)
1947: sshpkt_fatal(ssh, __func__, r);
1948:
1949: if ((r = ssh_packet_write_wait(ssh)) != 0)
1950: sshpkt_fatal(ssh, __func__, r);
1.14 markus 1951:
1952: /* Close the connection. */
1.201 markus 1953: ssh_packet_close(ssh);
1.112 markus 1954: cleanup_exit(255);
1.1 deraadt 1955: }
1956:
1.205 djm 1957: /*
1958: * Checks if there is any buffered output, and tries to write some of
1959: * the output.
1960: */
1961: int
1.201 markus 1962: ssh_packet_write_poll(struct ssh *ssh)
1.1 deraadt 1963: {
1.201 markus 1964: struct session_state *state = ssh->state;
1965: int len = sshbuf_len(state->output);
1966: int cont, r;
1.97 deraadt 1967:
1.14 markus 1968: if (len > 0) {
1.163 andreas 1969: cont = 0;
1.201 markus 1970: len = roaming_write(state->connection_out,
1971: sshbuf_ptr(state->output), len, &cont);
1.156 djm 1972: if (len == -1) {
1973: if (errno == EINTR || errno == EAGAIN)
1.205 djm 1974: return 0;
1975: return SSH_ERR_SYSTEM_ERROR;
1.14 markus 1976: }
1.163 andreas 1977: if (len == 0 && !cont)
1.205 djm 1978: return SSH_ERR_CONN_CLOSED;
1.201 markus 1979: if ((r = sshbuf_consume(state->output, len)) != 0)
1.205 djm 1980: return r;
1.14 markus 1981: }
1.205 djm 1982: return 0;
1.1 deraadt 1983: }
1984:
1.16 markus 1985: /*
1986: * Calls packet_write_poll repeatedly until all pending output data has been
1987: * written.
1988: */
1.205 djm 1989: int
1.201 markus 1990: ssh_packet_write_wait(struct ssh *ssh)
1.1 deraadt 1991: {
1.56 millert 1992: fd_set *setp;
1.205 djm 1993: int ret, r, ms_remain = 0;
1.154 dtucker 1994: struct timeval start, timeout, *timeoutp = NULL;
1.201 markus 1995: struct session_state *state = ssh->state;
1.56 millert 1996:
1.201 markus 1997: setp = (fd_set *)calloc(howmany(state->connection_out + 1,
1.161 andreas 1998: NFDBITS), sizeof(fd_mask));
1.201 markus 1999: if (setp == NULL)
1.205 djm 2000: return SSH_ERR_ALLOC_FAIL;
1.201 markus 2001: ssh_packet_write_poll(ssh);
2002: while (ssh_packet_have_data_to_write(ssh)) {
2003: memset(setp, 0, howmany(state->connection_out + 1,
1.161 andreas 2004: NFDBITS) * sizeof(fd_mask));
1.201 markus 2005: FD_SET(state->connection_out, setp);
1.154 dtucker 2006:
1.201 markus 2007: if (state->packet_timeout_ms > 0) {
2008: ms_remain = state->packet_timeout_ms;
1.154 dtucker 2009: timeoutp = &timeout;
2010: }
2011: for (;;) {
1.201 markus 2012: if (state->packet_timeout_ms != -1) {
1.154 dtucker 2013: ms_to_timeval(&timeout, ms_remain);
2014: gettimeofday(&start, NULL);
2015: }
1.201 markus 2016: if ((ret = select(state->connection_out + 1,
1.161 andreas 2017: NULL, setp, NULL, timeoutp)) >= 0)
1.154 dtucker 2018: break;
1.161 andreas 2019: if (errno != EAGAIN && errno != EINTR)
1.154 dtucker 2020: break;
1.201 markus 2021: if (state->packet_timeout_ms == -1)
1.154 dtucker 2022: continue;
2023: ms_subtract_diff(&start, &ms_remain);
2024: if (ms_remain <= 0) {
2025: ret = 0;
2026: break;
2027: }
2028: }
2029: if (ret == 0) {
1.205 djm 2030: free(setp);
2031: return SSH_ERR_CONN_TIMEOUT;
2032: }
2033: if ((r = ssh_packet_write_poll(ssh)) != 0) {
2034: free(setp);
2035: return r;
1.154 dtucker 2036: }
1.14 markus 2037: }
1.186 djm 2038: free(setp);
1.205 djm 2039: return 0;
1.1 deraadt 2040: }
2041:
2042: /* Returns true if there is buffered data to write to the connection. */
2043:
1.2 provos 2044: int
1.201 markus 2045: ssh_packet_have_data_to_write(struct ssh *ssh)
1.1 deraadt 2046: {
1.201 markus 2047: return sshbuf_len(ssh->state->output) != 0;
1.1 deraadt 2048: }
2049:
2050: /* Returns true if there is not too much data to write to the connection. */
2051:
1.2 provos 2052: int
1.201 markus 2053: ssh_packet_not_very_much_data_to_write(struct ssh *ssh)
1.1 deraadt 2054: {
1.201 markus 2055: if (ssh->state->interactive_mode)
2056: return sshbuf_len(ssh->state->output) < 16384;
1.14 markus 2057: else
1.201 markus 2058: return sshbuf_len(ssh->state->output) < 128 * 1024;
1.1 deraadt 2059: }
2060:
1.201 markus 2061: void
2062: ssh_packet_set_tos(struct ssh *ssh, int tos)
1.101 markus 2063: {
1.201 markus 2064: if (!ssh_packet_connection_is_on_socket(ssh))
1.101 markus 2065: return;
1.201 markus 2066: switch (ssh_packet_connection_af(ssh)) {
1.173 djm 2067: case AF_INET:
2068: debug3("%s: set IP_TOS 0x%02x", __func__, tos);
1.201 markus 2069: if (setsockopt(ssh->state->connection_in,
1.173 djm 2070: IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0)
2071: error("setsockopt IP_TOS %d: %.100s:",
2072: tos, strerror(errno));
2073: break;
2074: case AF_INET6:
2075: debug3("%s: set IPV6_TCLASS 0x%02x", __func__, tos);
1.201 markus 2076: if (setsockopt(ssh->state->connection_in,
1.173 djm 2077: IPPROTO_IPV6, IPV6_TCLASS, &tos, sizeof(tos)) < 0)
2078: error("setsockopt IPV6_TCLASS %d: %.100s:",
2079: tos, strerror(errno));
2080: break;
2081: }
1.101 markus 2082: }
2083:
1.1 deraadt 2084: /* Informs that the current session is interactive. Sets IP flags for that. */
2085:
1.2 provos 2086: void
1.201 markus 2087: ssh_packet_set_interactive(struct ssh *ssh, int interactive, int qos_interactive, int qos_bulk)
1.1 deraadt 2088: {
1.201 markus 2089: struct session_state *state = ssh->state;
2090:
2091: if (state->set_interactive_called)
1.43 markus 2092: return;
1.201 markus 2093: state->set_interactive_called = 1;
1.1 deraadt 2094:
1.14 markus 2095: /* Record that we are in interactive mode. */
1.201 markus 2096: state->interactive_mode = interactive;
1.1 deraadt 2097:
1.19 markus 2098: /* Only set socket options if using a socket. */
1.201 markus 2099: if (!ssh_packet_connection_is_on_socket(ssh))
1.14 markus 2100: return;
1.201 markus 2101: set_nodelay(state->connection_in);
2102: ssh_packet_set_tos(ssh, interactive ? qos_interactive :
2103: qos_bulk);
1.1 deraadt 2104: }
2105:
2106: /* Returns true if the current connection is interactive. */
2107:
1.2 provos 2108: int
1.201 markus 2109: ssh_packet_is_interactive(struct ssh *ssh)
1.1 deraadt 2110: {
1.201 markus 2111: return ssh->state->interactive_mode;
1.12 markus 2112: }
2113:
1.113 deraadt 2114: int
1.201 markus 2115: ssh_packet_set_maxsize(struct ssh *ssh, u_int s)
1.12 markus 2116: {
1.201 markus 2117: struct session_state *state = ssh->state;
2118:
2119: if (state->set_maxsize_called) {
1.106 itojun 2120: logit("packet_set_maxsize: called twice: old %d new %d",
1.201 markus 2121: state->max_packet_size, s);
1.14 markus 2122: return -1;
2123: }
2124: if (s < 4 * 1024 || s > 1024 * 1024) {
1.106 itojun 2125: logit("packet_set_maxsize: bad size %d", s);
1.14 markus 2126: return -1;
2127: }
1.201 markus 2128: state->set_maxsize_called = 1;
1.66 markus 2129: debug("packet_set_maxsize: setting to %d", s);
1.201 markus 2130: state->max_packet_size = s;
1.14 markus 2131: return s;
1.53 markus 2132: }
2133:
1.161 andreas 2134: int
1.201 markus 2135: ssh_packet_inc_alive_timeouts(struct ssh *ssh)
1.161 andreas 2136: {
1.201 markus 2137: return ++ssh->state->keep_alive_timeouts;
1.161 andreas 2138: }
2139:
2140: void
1.201 markus 2141: ssh_packet_set_alive_timeouts(struct ssh *ssh, int ka)
1.161 andreas 2142: {
1.201 markus 2143: ssh->state->keep_alive_timeouts = ka;
1.161 andreas 2144: }
2145:
2146: u_int
1.201 markus 2147: ssh_packet_get_maxsize(struct ssh *ssh)
1.71 markus 2148: {
1.201 markus 2149: return ssh->state->max_packet_size;
1.71 markus 2150: }
2151:
1.53 markus 2152: /*
2153: * 9.2. Ignored Data Message
1.61 markus 2154: *
1.53 markus 2155: * byte SSH_MSG_IGNORE
2156: * string data
1.61 markus 2157: *
1.53 markus 2158: * All implementations MUST understand (and ignore) this message at any
2159: * time (after receiving the protocol version). No implementation is
2160: * required to send them. This message can be used as an additional
2161: * protection measure against advanced traffic analysis techniques.
2162: */
1.54 markus 2163: void
1.201 markus 2164: ssh_packet_send_ignore(struct ssh *ssh, int nbytes)
1.54 markus 2165: {
1.115 avsm 2166: u_int32_t rnd = 0;
1.201 markus 2167: int r, i;
1.54 markus 2168:
1.201 markus 2169: if ((r = sshpkt_start(ssh, compat20 ?
2170: SSH2_MSG_IGNORE : SSH_MSG_IGNORE)) != 0 ||
2171: (r = sshpkt_put_u32(ssh, nbytes)) != 0)
2172: fatal("%s: %s", __func__, ssh_err(r));
1.75 deraadt 2173: for (i = 0; i < nbytes; i++) {
1.53 markus 2174: if (i % 4 == 0)
1.115 avsm 2175: rnd = arc4random();
1.201 markus 2176: if ((r = sshpkt_put_u8(ssh, (u_char)rnd & 0xff)) != 0)
2177: fatal("%s: %s", __func__, ssh_err(r));
1.115 avsm 2178: rnd >>= 8;
1.53 markus 2179: }
1.105 markus 2180: }
2181:
1.113 deraadt 2182: #define MAX_PACKETS (1U<<31)
1.105 markus 2183: int
1.201 markus 2184: ssh_packet_need_rekeying(struct ssh *ssh)
1.105 markus 2185: {
1.201 markus 2186: struct session_state *state = ssh->state;
2187:
2188: if (ssh->compat & SSH_BUG_NOREKEY)
1.105 markus 2189: return 0;
2190: return
1.201 markus 2191: (state->p_send.packets > MAX_PACKETS) ||
2192: (state->p_read.packets > MAX_PACKETS) ||
2193: (state->max_blocks_out &&
2194: (state->p_send.blocks > state->max_blocks_out)) ||
2195: (state->max_blocks_in &&
2196: (state->p_read.blocks > state->max_blocks_in)) ||
2197: (state->rekey_interval != 0 && state->rekey_time +
2198: state->rekey_interval <= monotime());
1.105 markus 2199: }
2200:
2201: void
1.201 markus 2202: ssh_packet_set_rekey_limits(struct ssh *ssh, u_int32_t bytes, time_t seconds)
1.105 markus 2203: {
1.184 dtucker 2204: debug3("rekey after %lld bytes, %d seconds", (long long)bytes,
2205: (int)seconds);
1.201 markus 2206: ssh->state->rekey_limit = bytes;
2207: ssh->state->rekey_interval = seconds;
1.184 dtucker 2208: /*
2209: * We set the time here so that in post-auth privsep slave we count
2210: * from the completion of the authentication.
2211: */
1.201 markus 2212: ssh->state->rekey_time = monotime();
1.184 dtucker 2213: }
2214:
2215: time_t
1.201 markus 2216: ssh_packet_get_rekey_timeout(struct ssh *ssh)
1.184 dtucker 2217: {
2218: time_t seconds;
2219:
1.201 markus 2220: seconds = ssh->state->rekey_time + ssh->state->rekey_interval -
1.187 dtucker 2221: monotime();
1.185 dtucker 2222: return (seconds <= 0 ? 1 : seconds);
1.118 markus 2223: }
2224:
2225: void
1.201 markus 2226: ssh_packet_set_server(struct ssh *ssh)
1.118 markus 2227: {
1.201 markus 2228: ssh->state->server_side = 1;
1.118 markus 2229: }
2230:
2231: void
1.201 markus 2232: ssh_packet_set_authenticated(struct ssh *ssh)
1.118 markus 2233: {
1.201 markus 2234: ssh->state->after_authentication = 1;
1.161 andreas 2235: }
2236:
2237: void *
1.201 markus 2238: ssh_packet_get_input(struct ssh *ssh)
1.161 andreas 2239: {
1.201 markus 2240: return (void *)ssh->state->input;
1.161 andreas 2241: }
2242:
2243: void *
1.201 markus 2244: ssh_packet_get_output(struct ssh *ssh)
1.161 andreas 2245: {
1.201 markus 2246: return (void *)ssh->state->output;
1.166 andreas 2247: }
2248:
1.201 markus 2249: /* XXX TODO update roaming to new API (does not work anyway) */
1.166 andreas 2250: /*
2251: * Save the state for the real connection, and use a separate state when
2252: * resuming a suspended connection.
2253: */
2254: void
1.201 markus 2255: ssh_packet_backup_state(struct ssh *ssh,
2256: struct ssh *backup_state)
1.166 andreas 2257: {
1.201 markus 2258: struct ssh *tmp;
1.166 andreas 2259:
1.201 markus 2260: close(ssh->state->connection_in);
2261: ssh->state->connection_in = -1;
2262: close(ssh->state->connection_out);
2263: ssh->state->connection_out = -1;
1.166 andreas 2264: if (backup_state)
2265: tmp = backup_state;
2266: else
1.201 markus 2267: tmp = ssh_alloc_session_state();
2268: backup_state = ssh;
2269: ssh = tmp;
1.166 andreas 2270: }
2271:
1.201 markus 2272: /* XXX FIXME FIXME FIXME */
1.166 andreas 2273: /*
2274: * Swap in the old state when resuming a connecion.
2275: */
2276: void
1.201 markus 2277: ssh_packet_restore_state(struct ssh *ssh,
2278: struct ssh *backup_state)
1.166 andreas 2279: {
1.201 markus 2280: struct ssh *tmp;
1.166 andreas 2281: u_int len;
1.201 markus 2282: int r;
1.166 andreas 2283:
2284: tmp = backup_state;
1.201 markus 2285: backup_state = ssh;
2286: ssh = tmp;
2287: ssh->state->connection_in = backup_state->state->connection_in;
2288: backup_state->state->connection_in = -1;
2289: ssh->state->connection_out = backup_state->state->connection_out;
2290: backup_state->state->connection_out = -1;
2291: len = sshbuf_len(backup_state->state->input);
1.166 andreas 2292: if (len > 0) {
1.201 markus 2293: if ((r = sshbuf_putb(ssh->state->input,
2294: backup_state->state->input)) != 0)
2295: fatal("%s: %s", __func__, ssh_err(r));
2296: sshbuf_reset(backup_state->state->input);
1.166 andreas 2297: add_recv_bytes(len);
1.196 markus 2298: }
2299: }
2300:
2301: /* Reset after_authentication and reset compression in post-auth privsep */
1.201 markus 2302: static int
2303: ssh_packet_set_postauth(struct ssh *ssh)
1.196 markus 2304: {
1.201 markus 2305: struct sshcomp *comp;
2306: int r, mode;
1.196 markus 2307:
2308: debug("%s: called", __func__);
2309: /* This was set in net child, but is not visible in user child */
1.201 markus 2310: ssh->state->after_authentication = 1;
2311: ssh->state->rekeying = 0;
1.196 markus 2312: for (mode = 0; mode < MODE_MAX; mode++) {
1.201 markus 2313: if (ssh->state->newkeys[mode] == NULL)
1.196 markus 2314: continue;
1.201 markus 2315: comp = &ssh->state->newkeys[mode]->comp;
2316: if (comp && comp->enabled &&
2317: (r = ssh_packet_init_compression(ssh)) != 0)
2318: return r;
2319: }
2320: return 0;
2321: }
2322:
2323: /* Packet state (de-)serialization for privsep */
2324:
2325: /* turn kex into a blob for packet state serialization */
2326: static int
2327: kex_to_blob(struct sshbuf *m, struct kex *kex)
2328: {
2329: int r;
2330:
2331: if ((r = sshbuf_put_string(m, kex->session_id,
2332: kex->session_id_len)) != 0 ||
2333: (r = sshbuf_put_u32(m, kex->we_need)) != 0 ||
2334: (r = sshbuf_put_u32(m, kex->hostkey_type)) != 0 ||
2335: (r = sshbuf_put_u32(m, kex->kex_type)) != 0 ||
2336: (r = sshbuf_put_stringb(m, kex->my)) != 0 ||
2337: (r = sshbuf_put_stringb(m, kex->peer)) != 0 ||
2338: (r = sshbuf_put_u32(m, kex->flags)) != 0 ||
2339: (r = sshbuf_put_cstring(m, kex->client_version_string)) != 0 ||
2340: (r = sshbuf_put_cstring(m, kex->server_version_string)) != 0)
2341: return r;
2342: return 0;
2343: }
2344:
2345: /* turn key exchange results into a blob for packet state serialization */
2346: static int
2347: newkeys_to_blob(struct sshbuf *m, struct ssh *ssh, int mode)
2348: {
2349: struct sshbuf *b;
2350: struct sshcipher_ctx *cc;
2351: struct sshcomp *comp;
2352: struct sshenc *enc;
2353: struct sshmac *mac;
2354: struct newkeys *newkey;
2355: int r;
2356:
2357: if ((newkey = ssh->state->newkeys[mode]) == NULL)
2358: return SSH_ERR_INTERNAL_ERROR;
2359: enc = &newkey->enc;
2360: mac = &newkey->mac;
2361: comp = &newkey->comp;
2362: cc = (mode == MODE_OUT) ? &ssh->state->send_context :
2363: &ssh->state->receive_context;
2364: if ((r = cipher_get_keyiv(cc, enc->iv, enc->iv_len)) != 0)
2365: return r;
2366: if ((b = sshbuf_new()) == NULL)
2367: return SSH_ERR_ALLOC_FAIL;
2368: /* The cipher struct is constant and shared, you export pointer */
2369: if ((r = sshbuf_put_cstring(b, enc->name)) != 0 ||
2370: (r = sshbuf_put(b, &enc->cipher, sizeof(enc->cipher))) != 0 ||
2371: (r = sshbuf_put_u32(b, enc->enabled)) != 0 ||
2372: (r = sshbuf_put_u32(b, enc->block_size)) != 0 ||
2373: (r = sshbuf_put_string(b, enc->key, enc->key_len)) != 0 ||
2374: (r = sshbuf_put_string(b, enc->iv, enc->iv_len)) != 0)
2375: goto out;
2376: if (cipher_authlen(enc->cipher) == 0) {
2377: if ((r = sshbuf_put_cstring(b, mac->name)) != 0 ||
2378: (r = sshbuf_put_u32(b, mac->enabled)) != 0 ||
2379: (r = sshbuf_put_string(b, mac->key, mac->key_len)) != 0)
2380: goto out;
2381: }
2382: if ((r = sshbuf_put_u32(b, comp->type)) != 0 ||
2383: (r = sshbuf_put_u32(b, comp->enabled)) != 0 ||
2384: (r = sshbuf_put_cstring(b, comp->name)) != 0)
2385: goto out;
2386: r = sshbuf_put_stringb(m, b);
2387: out:
2388: if (b != NULL)
2389: sshbuf_free(b);
2390: return r;
2391: }
2392:
2393: /* serialize packet state into a blob */
2394: int
2395: ssh_packet_get_state(struct ssh *ssh, struct sshbuf *m)
2396: {
2397: struct session_state *state = ssh->state;
2398: u_char *p;
2399: size_t slen, rlen;
2400: int r, ssh1cipher;
2401:
2402: if (!compat20) {
2403: ssh1cipher = cipher_get_number(state->receive_context.cipher);
2404: slen = cipher_get_keyiv_len(&state->send_context);
2405: rlen = cipher_get_keyiv_len(&state->receive_context);
2406: if ((r = sshbuf_put_u32(m, state->remote_protocol_flags)) != 0 ||
2407: (r = sshbuf_put_u32(m, ssh1cipher)) != 0 ||
2408: (r = sshbuf_put_string(m, state->ssh1_key, state->ssh1_keylen)) != 0 ||
2409: (r = sshbuf_put_u32(m, slen)) != 0 ||
2410: (r = sshbuf_reserve(m, slen, &p)) != 0 ||
2411: (r = cipher_get_keyiv(&state->send_context, p, slen)) != 0 ||
2412: (r = sshbuf_put_u32(m, rlen)) != 0 ||
2413: (r = sshbuf_reserve(m, rlen, &p)) != 0 ||
2414: (r = cipher_get_keyiv(&state->receive_context, p, rlen)) != 0)
2415: return r;
2416: } else {
2417: if ((r = kex_to_blob(m, ssh->kex)) != 0 ||
2418: (r = newkeys_to_blob(m, ssh, MODE_OUT)) != 0 ||
2419: (r = newkeys_to_blob(m, ssh, MODE_IN)) != 0 ||
2420: (r = sshbuf_put_u32(m, state->p_send.seqnr)) != 0 ||
2421: (r = sshbuf_put_u64(m, state->p_send.blocks)) != 0 ||
2422: (r = sshbuf_put_u32(m, state->p_send.packets)) != 0 ||
2423: (r = sshbuf_put_u64(m, state->p_send.bytes)) != 0 ||
2424: (r = sshbuf_put_u32(m, state->p_read.seqnr)) != 0 ||
2425: (r = sshbuf_put_u64(m, state->p_read.blocks)) != 0 ||
2426: (r = sshbuf_put_u32(m, state->p_read.packets)) != 0 ||
2427: (r = sshbuf_put_u64(m, state->p_read.bytes)) != 0)
2428: return r;
2429: }
2430:
2431: slen = cipher_get_keycontext(&state->send_context, NULL);
2432: rlen = cipher_get_keycontext(&state->receive_context, NULL);
2433: if ((r = sshbuf_put_u32(m, slen)) != 0 ||
2434: (r = sshbuf_reserve(m, slen, &p)) != 0)
2435: return r;
2436: if (cipher_get_keycontext(&state->send_context, p) != (int)slen)
2437: return SSH_ERR_INTERNAL_ERROR;
2438: if ((r = sshbuf_put_u32(m, rlen)) != 0 ||
2439: (r = sshbuf_reserve(m, rlen, &p)) != 0)
2440: return r;
2441: if (cipher_get_keycontext(&state->receive_context, p) != (int)rlen)
2442: return SSH_ERR_INTERNAL_ERROR;
2443:
2444: if ((r = ssh_packet_get_compress_state(m, ssh)) != 0 ||
2445: (r = sshbuf_put_stringb(m, state->input)) != 0 ||
2446: (r = sshbuf_put_stringb(m, state->output)) != 0)
2447: return r;
2448:
2449: if (compat20) {
2450: if ((r = sshbuf_put_u64(m, get_sent_bytes())) != 0 ||
2451: (r = sshbuf_put_u64(m, get_recv_bytes())) != 0)
2452: return r;
2453: }
2454: return 0;
2455: }
2456:
2457: /* restore key exchange results from blob for packet state de-serialization */
2458: static int
2459: newkeys_from_blob(struct sshbuf *m, struct ssh *ssh, int mode)
2460: {
2461: struct sshbuf *b = NULL;
2462: struct sshcomp *comp;
2463: struct sshenc *enc;
2464: struct sshmac *mac;
2465: struct newkeys *newkey = NULL;
2466: size_t keylen, ivlen, maclen;
2467: int r;
2468:
2469: if ((newkey = calloc(1, sizeof(*newkey))) == NULL) {
2470: r = SSH_ERR_ALLOC_FAIL;
2471: goto out;
2472: }
2473: if ((r = sshbuf_froms(m, &b)) != 0)
2474: goto out;
2475: #ifdef DEBUG_PK
2476: sshbuf_dump(b, stderr);
2477: #endif
2478: enc = &newkey->enc;
2479: mac = &newkey->mac;
2480: comp = &newkey->comp;
2481:
2482: if ((r = sshbuf_get_cstring(b, &enc->name, NULL)) != 0 ||
2483: (r = sshbuf_get(b, &enc->cipher, sizeof(enc->cipher))) != 0 ||
2484: (r = sshbuf_get_u32(b, (u_int *)&enc->enabled)) != 0 ||
2485: (r = sshbuf_get_u32(b, &enc->block_size)) != 0 ||
2486: (r = sshbuf_get_string(b, &enc->key, &keylen)) != 0 ||
2487: (r = sshbuf_get_string(b, &enc->iv, &ivlen)) != 0)
2488: goto out;
2489: if (cipher_authlen(enc->cipher) == 0) {
2490: if ((r = sshbuf_get_cstring(b, &mac->name, NULL)) != 0)
2491: goto out;
2492: if ((r = mac_setup(mac, mac->name)) != 0)
2493: goto out;
2494: if ((r = sshbuf_get_u32(b, (u_int *)&mac->enabled)) != 0 ||
2495: (r = sshbuf_get_string(b, &mac->key, &maclen)) != 0)
2496: goto out;
2497: if (maclen > mac->key_len) {
2498: r = SSH_ERR_INVALID_FORMAT;
2499: goto out;
2500: }
2501: mac->key_len = maclen;
2502: }
2503: if ((r = sshbuf_get_u32(b, &comp->type)) != 0 ||
2504: (r = sshbuf_get_u32(b, (u_int *)&comp->enabled)) != 0 ||
2505: (r = sshbuf_get_cstring(b, &comp->name, NULL)) != 0)
2506: goto out;
2507: if (enc->name == NULL ||
2508: cipher_by_name(enc->name) != enc->cipher) {
2509: r = SSH_ERR_INVALID_FORMAT;
2510: goto out;
2511: }
2512: if (sshbuf_len(b) != 0) {
2513: r = SSH_ERR_INVALID_FORMAT;
2514: goto out;
2515: }
2516: enc->key_len = keylen;
2517: enc->iv_len = ivlen;
2518: ssh->kex->newkeys[mode] = newkey;
2519: newkey = NULL;
2520: r = 0;
2521: out:
2522: if (newkey != NULL)
2523: free(newkey);
2524: if (b != NULL)
2525: sshbuf_free(b);
2526: return r;
2527: }
2528:
2529: /* restore kex from blob for packet state de-serialization */
2530: static int
2531: kex_from_blob(struct sshbuf *m, struct kex **kexp)
2532: {
2533: struct kex *kex;
2534: int r;
2535:
2536: if ((kex = calloc(1, sizeof(struct kex))) == NULL ||
2537: (kex->my = sshbuf_new()) == NULL ||
2538: (kex->peer = sshbuf_new()) == NULL) {
2539: r = SSH_ERR_ALLOC_FAIL;
2540: goto out;
2541: }
2542: if ((r = sshbuf_get_string(m, &kex->session_id, &kex->session_id_len)) != 0 ||
2543: (r = sshbuf_get_u32(m, &kex->we_need)) != 0 ||
2544: (r = sshbuf_get_u32(m, (u_int *)&kex->hostkey_type)) != 0 ||
2545: (r = sshbuf_get_u32(m, &kex->kex_type)) != 0 ||
2546: (r = sshbuf_get_stringb(m, kex->my)) != 0 ||
2547: (r = sshbuf_get_stringb(m, kex->peer)) != 0 ||
2548: (r = sshbuf_get_u32(m, &kex->flags)) != 0 ||
2549: (r = sshbuf_get_cstring(m, &kex->client_version_string, NULL)) != 0 ||
2550: (r = sshbuf_get_cstring(m, &kex->server_version_string, NULL)) != 0)
2551: goto out;
2552: kex->server = 1;
2553: kex->done = 1;
2554: r = 0;
2555: out:
2556: if (r != 0 || kexp == NULL) {
2557: if (kex != NULL) {
2558: if (kex->my != NULL)
2559: sshbuf_free(kex->my);
2560: if (kex->peer != NULL)
2561: sshbuf_free(kex->peer);
2562: free(kex);
2563: }
2564: if (kexp != NULL)
2565: *kexp = NULL;
2566: } else {
2567: *kexp = kex;
2568: }
2569: return r;
2570: }
2571:
2572: /*
2573: * Restore packet state from content of blob 'm' (de-serialization).
2574: * Note that 'm' will be partially consumed on parsing or any other errors.
2575: */
2576: int
2577: ssh_packet_set_state(struct ssh *ssh, struct sshbuf *m)
2578: {
2579: struct session_state *state = ssh->state;
2580: const u_char *ssh1key, *ivin, *ivout, *keyin, *keyout, *input, *output;
2581: size_t ssh1keylen, rlen, slen, ilen, olen;
2582: int r;
2583: u_int ssh1cipher = 0;
2584: u_int64_t sent_bytes = 0, recv_bytes = 0;
2585:
2586: if (!compat20) {
2587: if ((r = sshbuf_get_u32(m, &state->remote_protocol_flags)) != 0 ||
2588: (r = sshbuf_get_u32(m, &ssh1cipher)) != 0 ||
2589: (r = sshbuf_get_string_direct(m, &ssh1key, &ssh1keylen)) != 0 ||
2590: (r = sshbuf_get_string_direct(m, &ivout, &slen)) != 0 ||
2591: (r = sshbuf_get_string_direct(m, &ivin, &rlen)) != 0)
2592: return r;
2593: if (ssh1cipher > INT_MAX)
2594: return SSH_ERR_KEY_UNKNOWN_CIPHER;
2595: ssh_packet_set_encryption_key(ssh, ssh1key, ssh1keylen,
2596: (int)ssh1cipher);
2597: if (cipher_get_keyiv_len(&state->send_context) != (int)slen ||
2598: cipher_get_keyiv_len(&state->receive_context) != (int)rlen)
2599: return SSH_ERR_INVALID_FORMAT;
2600: if ((r = cipher_set_keyiv(&state->send_context, ivout)) != 0 ||
2601: (r = cipher_set_keyiv(&state->receive_context, ivin)) != 0)
2602: return r;
2603: } else {
2604: if ((r = kex_from_blob(m, &ssh->kex)) != 0 ||
2605: (r = newkeys_from_blob(m, ssh, MODE_OUT)) != 0 ||
2606: (r = newkeys_from_blob(m, ssh, MODE_IN)) != 0 ||
2607: (r = sshbuf_get_u32(m, &state->p_send.seqnr)) != 0 ||
2608: (r = sshbuf_get_u64(m, &state->p_send.blocks)) != 0 ||
2609: (r = sshbuf_get_u32(m, &state->p_send.packets)) != 0 ||
2610: (r = sshbuf_get_u64(m, &state->p_send.bytes)) != 0 ||
2611: (r = sshbuf_get_u32(m, &state->p_read.seqnr)) != 0 ||
2612: (r = sshbuf_get_u64(m, &state->p_read.blocks)) != 0 ||
2613: (r = sshbuf_get_u32(m, &state->p_read.packets)) != 0 ||
2614: (r = sshbuf_get_u64(m, &state->p_read.bytes)) != 0)
2615: return r;
2616: /* XXX ssh_set_newkeys overrides p_read.packets? XXX */
2617: if ((r = ssh_set_newkeys(ssh, MODE_IN)) != 0 ||
2618: (r = ssh_set_newkeys(ssh, MODE_OUT)) != 0)
2619: return r;
2620: }
2621: if ((r = sshbuf_get_string_direct(m, &keyout, &slen)) != 0 ||
2622: (r = sshbuf_get_string_direct(m, &keyin, &rlen)) != 0)
2623: return r;
2624: if (cipher_get_keycontext(&state->send_context, NULL) != (int)slen ||
2625: cipher_get_keycontext(&state->receive_context, NULL) != (int)rlen)
2626: return SSH_ERR_INVALID_FORMAT;
2627: cipher_set_keycontext(&state->send_context, keyout);
2628: cipher_set_keycontext(&state->receive_context, keyin);
2629:
2630: if ((r = ssh_packet_set_compress_state(ssh, m)) != 0 ||
2631: (r = ssh_packet_set_postauth(ssh)) != 0)
2632: return r;
2633:
2634: sshbuf_reset(state->input);
2635: sshbuf_reset(state->output);
2636: if ((r = sshbuf_get_string_direct(m, &input, &ilen)) != 0 ||
2637: (r = sshbuf_get_string_direct(m, &output, &olen)) != 0 ||
2638: (r = sshbuf_put(state->input, input, ilen)) != 0 ||
2639: (r = sshbuf_put(state->output, output, olen)) != 0)
2640: return r;
2641:
2642: if (compat20) {
2643: if ((r = sshbuf_get_u64(m, &sent_bytes)) != 0 ||
2644: (r = sshbuf_get_u64(m, &recv_bytes)) != 0)
2645: return r;
2646: roam_set_bytes(sent_bytes, recv_bytes);
2647: }
2648: if (sshbuf_len(m))
2649: return SSH_ERR_INVALID_FORMAT;
2650: debug3("%s: done", __func__);
2651: return 0;
2652: }
2653:
2654: /* NEW API */
2655:
2656: /* put data to the outgoing packet */
2657:
2658: int
2659: sshpkt_put(struct ssh *ssh, const void *v, size_t len)
2660: {
2661: return sshbuf_put(ssh->state->outgoing_packet, v, len);
2662: }
2663:
2664: int
2665: sshpkt_putb(struct ssh *ssh, const struct sshbuf *b)
2666: {
2667: return sshbuf_putb(ssh->state->outgoing_packet, b);
2668: }
2669:
2670: int
2671: sshpkt_put_u8(struct ssh *ssh, u_char val)
2672: {
2673: return sshbuf_put_u8(ssh->state->outgoing_packet, val);
2674: }
2675:
2676: int
2677: sshpkt_put_u32(struct ssh *ssh, u_int32_t val)
2678: {
2679: return sshbuf_put_u32(ssh->state->outgoing_packet, val);
2680: }
2681:
2682: int
2683: sshpkt_put_u64(struct ssh *ssh, u_int64_t val)
2684: {
2685: return sshbuf_put_u64(ssh->state->outgoing_packet, val);
2686: }
2687:
2688: int
2689: sshpkt_put_string(struct ssh *ssh, const void *v, size_t len)
2690: {
2691: return sshbuf_put_string(ssh->state->outgoing_packet, v, len);
2692: }
2693:
2694: int
2695: sshpkt_put_cstring(struct ssh *ssh, const void *v)
2696: {
2697: return sshbuf_put_cstring(ssh->state->outgoing_packet, v);
2698: }
2699:
2700: int
2701: sshpkt_put_stringb(struct ssh *ssh, const struct sshbuf *v)
2702: {
2703: return sshbuf_put_stringb(ssh->state->outgoing_packet, v);
2704: }
2705:
2706: int
2707: sshpkt_put_ec(struct ssh *ssh, const EC_POINT *v, const EC_GROUP *g)
2708: {
2709: return sshbuf_put_ec(ssh->state->outgoing_packet, v, g);
2710: }
2711:
2712: int
2713: sshpkt_put_bignum1(struct ssh *ssh, const BIGNUM *v)
2714: {
2715: return sshbuf_put_bignum1(ssh->state->outgoing_packet, v);
2716: }
2717:
2718: int
2719: sshpkt_put_bignum2(struct ssh *ssh, const BIGNUM *v)
2720: {
2721: return sshbuf_put_bignum2(ssh->state->outgoing_packet, v);
2722: }
2723:
2724: /* fetch data from the incoming packet */
2725:
2726: int
2727: sshpkt_get(struct ssh *ssh, void *valp, size_t len)
2728: {
2729: return sshbuf_get(ssh->state->incoming_packet, valp, len);
2730: }
2731:
2732: int
2733: sshpkt_get_u8(struct ssh *ssh, u_char *valp)
2734: {
2735: return sshbuf_get_u8(ssh->state->incoming_packet, valp);
2736: }
2737:
2738: int
2739: sshpkt_get_u32(struct ssh *ssh, u_int32_t *valp)
2740: {
2741: return sshbuf_get_u32(ssh->state->incoming_packet, valp);
2742: }
2743:
2744: int
2745: sshpkt_get_u64(struct ssh *ssh, u_int64_t *valp)
2746: {
2747: return sshbuf_get_u64(ssh->state->incoming_packet, valp);
2748: }
2749:
2750: int
2751: sshpkt_get_string(struct ssh *ssh, u_char **valp, size_t *lenp)
2752: {
2753: return sshbuf_get_string(ssh->state->incoming_packet, valp, lenp);
2754: }
2755:
2756: int
2757: sshpkt_get_string_direct(struct ssh *ssh, const u_char **valp, size_t *lenp)
2758: {
2759: return sshbuf_get_string_direct(ssh->state->incoming_packet, valp, lenp);
2760: }
2761:
2762: int
2763: sshpkt_get_cstring(struct ssh *ssh, char **valp, size_t *lenp)
2764: {
2765: return sshbuf_get_cstring(ssh->state->incoming_packet, valp, lenp);
2766: }
2767:
2768: int
2769: sshpkt_get_ec(struct ssh *ssh, EC_POINT *v, const EC_GROUP *g)
2770: {
2771: return sshbuf_get_ec(ssh->state->incoming_packet, v, g);
2772: }
2773:
2774: int
2775: sshpkt_get_bignum1(struct ssh *ssh, BIGNUM *v)
2776: {
2777: return sshbuf_get_bignum1(ssh->state->incoming_packet, v);
2778: }
2779:
2780: int
2781: sshpkt_get_bignum2(struct ssh *ssh, BIGNUM *v)
2782: {
2783: return sshbuf_get_bignum2(ssh->state->incoming_packet, v);
2784: }
2785:
2786: int
2787: sshpkt_get_end(struct ssh *ssh)
2788: {
2789: if (sshbuf_len(ssh->state->incoming_packet) > 0)
2790: return SSH_ERR_UNEXPECTED_TRAILING_DATA;
2791: return 0;
2792: }
2793:
2794: const u_char *
2795: sshpkt_ptr(struct ssh *ssh, size_t *lenp)
2796: {
2797: if (lenp != NULL)
2798: *lenp = sshbuf_len(ssh->state->incoming_packet);
2799: return sshbuf_ptr(ssh->state->incoming_packet);
2800: }
2801:
2802: /* start a new packet */
2803:
2804: int
2805: sshpkt_start(struct ssh *ssh, u_char type)
2806: {
2807: u_char buf[9];
2808: int len;
2809:
2810: DBG(debug("packet_start[%d]", type));
2811: len = compat20 ? 6 : 9;
2812: memset(buf, 0, len - 1);
2813: buf[len - 1] = type;
2814: sshbuf_reset(ssh->state->outgoing_packet);
2815: return sshbuf_put(ssh->state->outgoing_packet, buf, len);
2816: }
2817:
2818: /* send it */
2819:
2820: int
2821: sshpkt_send(struct ssh *ssh)
2822: {
2823: if (compat20)
2824: return ssh_packet_send2(ssh);
2825: else
2826: return ssh_packet_send1(ssh);
2827: }
2828:
2829: int
2830: sshpkt_disconnect(struct ssh *ssh, const char *fmt,...)
2831: {
2832: char buf[1024];
2833: va_list args;
2834: int r;
2835:
2836: va_start(args, fmt);
2837: vsnprintf(buf, sizeof(buf), fmt, args);
2838: va_end(args);
2839:
2840: if (compat20) {
2841: if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 ||
2842: (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_PROTOCOL_ERROR)) != 0 ||
2843: (r = sshpkt_put_cstring(ssh, buf)) != 0 ||
2844: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
2845: (r = sshpkt_send(ssh)) != 0)
2846: return r;
2847: } else {
2848: if ((r = sshpkt_start(ssh, SSH_MSG_DISCONNECT)) != 0 ||
2849: (r = sshpkt_put_cstring(ssh, buf)) != 0 ||
2850: (r = sshpkt_send(ssh)) != 0)
2851: return r;
1.166 andreas 2852: }
1.201 markus 2853: return 0;
2854: }
2855:
2856: /* roundup current message to pad bytes */
2857: int
2858: sshpkt_add_padding(struct ssh *ssh, u_char pad)
2859: {
2860: ssh->state->extra_pad = pad;
2861: return 0;
1.1 deraadt 2862: }
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