Annotation of src/usr.bin/ssh/packet.c, Revision 1.201
1.201 ! markus 1: /* $OpenBSD: packet.c,v 1.200 2015/01/13 19:31:40 markus 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:
1.142 deraadt 40: #include <sys/types.h>
1.105 markus 41: #include <sys/queue.h>
1.132 stevesk 42: #include <sys/socket.h>
1.138 stevesk 43: #include <sys/time.h>
1.139 stevesk 44: #include <sys/param.h>
1.121 stevesk 45:
1.132 stevesk 46: #include <netinet/in.h>
1.121 stevesk 47: #include <netinet/ip.h>
1.134 stevesk 48:
1.135 stevesk 49: #include <errno.h>
1.134 stevesk 50: #include <stdarg.h>
1.141 stevesk 51: #include <stdio.h>
1.140 stevesk 52: #include <stdlib.h>
1.137 stevesk 53: #include <string.h>
1.136 stevesk 54: #include <unistd.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);
! 231: state->connection_in = -1;
! 232: state->connection_out = -1;
! 233: state->max_packet_size = 32768;
! 234: state->packet_timeout_ms = -1;
! 235: state->p_send.packets = state->p_read.packets = 0;
! 236: state->initialized = 1;
! 237: /*
! 238: * ssh_packet_send2() needs to queue packets until
! 239: * we've done the initial key exchange.
! 240: */
! 241: state->rekeying = 1;
! 242: ssh->state = state;
! 243: return ssh;
! 244: fail:
! 245: if (state) {
! 246: sshbuf_free(state->input);
! 247: sshbuf_free(state->output);
! 248: sshbuf_free(state->incoming_packet);
! 249: sshbuf_free(state->outgoing_packet);
! 250: free(state);
! 251: }
! 252: free(ssh);
! 253: return NULL;
1.161 andreas 254: }
1.105 markus 255:
1.16 markus 256: /*
257: * Sets the descriptors used for communication. Disables encryption until
258: * packet_set_encryption_key is called.
259: */
1.201 ! markus 260: struct ssh *
! 261: ssh_packet_set_connection(struct ssh *ssh, int fd_in, int fd_out)
1.1 deraadt 262: {
1.201 ! markus 263: struct session_state *state;
! 264: const struct sshcipher *none = cipher_by_name("none");
1.197 djm 265: int r;
1.97 deraadt 266:
1.37 markus 267: if (none == NULL)
1.201 ! markus 268: fatal("%s: cannot load cipher 'none'", __func__);
! 269: if (ssh == NULL)
! 270: ssh = ssh_alloc_session_state();
! 271: if (ssh == NULL)
! 272: fatal("%s: cound not allocate state", __func__);
! 273: state = ssh->state;
! 274: state->connection_in = fd_in;
! 275: state->connection_out = fd_out;
! 276: if ((r = cipher_init(&state->send_context, none,
1.197 djm 277: (const u_char *)"", 0, NULL, 0, CIPHER_ENCRYPT)) != 0 ||
1.201 ! markus 278: (r = cipher_init(&state->receive_context, none,
1.197 djm 279: (const u_char *)"", 0, NULL, 0, CIPHER_DECRYPT)) != 0)
1.201 ! markus 280: fatal("%s: cipher_init failed: %s", __func__, ssh_err(r));
! 281: state->newkeys[MODE_IN] = state->newkeys[MODE_OUT] = NULL;
! 282: deattack_init(&state->deattack);
! 283: return ssh;
1.1 deraadt 284: }
285:
1.154 dtucker 286: void
1.201 ! markus 287: ssh_packet_set_timeout(struct ssh *ssh, int timeout, int count)
1.154 dtucker 288: {
1.201 ! markus 289: struct session_state *state = ssh->state;
! 290:
1.174 djm 291: if (timeout <= 0 || count <= 0) {
1.201 ! markus 292: state->packet_timeout_ms = -1;
1.154 dtucker 293: return;
294: }
295: if ((INT_MAX / 1000) / count < timeout)
1.201 ! markus 296: state->packet_timeout_ms = INT_MAX;
1.154 dtucker 297: else
1.201 ! markus 298: state->packet_timeout_ms = timeout * count * 1000;
1.154 dtucker 299: }
300:
1.201 ! markus 301: int
! 302: ssh_packet_stop_discard(struct ssh *ssh)
1.159 markus 303: {
1.201 ! markus 304: struct session_state *state = ssh->state;
! 305: int r;
! 306:
! 307: if (state->packet_discard_mac) {
1.159 markus 308: char buf[1024];
1.201 ! markus 309:
1.159 markus 310: memset(buf, 'a', sizeof(buf));
1.201 ! markus 311: while (sshbuf_len(state->incoming_packet) <
1.161 andreas 312: PACKET_MAX_SIZE)
1.201 ! markus 313: if ((r = sshbuf_put(state->incoming_packet, buf,
! 314: sizeof(buf))) != 0)
! 315: return r;
! 316: (void) mac_compute(state->packet_discard_mac,
! 317: state->p_read.seqnr,
! 318: sshbuf_ptr(state->incoming_packet), PACKET_MAX_SIZE,
! 319: NULL, 0);
1.159 markus 320: }
1.201 ! markus 321: logit("Finished discarding for %.200s", ssh_remote_ipaddr(ssh));
! 322: return SSH_ERR_MAC_INVALID;
1.159 markus 323: }
324:
1.201 ! markus 325: static int
! 326: ssh_packet_start_discard(struct ssh *ssh, struct sshenc *enc,
! 327: struct sshmac *mac, u_int packet_length, u_int discard)
1.159 markus 328: {
1.201 ! markus 329: struct session_state *state = ssh->state;
! 330: int r;
! 331:
! 332: if (enc == NULL || !cipher_is_cbc(enc->cipher) || (mac && mac->etm)) {
! 333: if ((r = sshpkt_disconnect(ssh, "Packet corrupt")) != 0)
! 334: return r;
! 335: return SSH_ERR_MAC_INVALID;
! 336: }
1.159 markus 337: if (packet_length != PACKET_MAX_SIZE && mac && mac->enabled)
1.201 ! markus 338: state->packet_discard_mac = mac;
! 339: if (sshbuf_len(state->input) >= discard &&
! 340: (r = ssh_packet_stop_discard(ssh)) != 0)
! 341: return r;
! 342: state->packet_discard = discard - sshbuf_len(state->input);
! 343: return 0;
1.159 markus 344: }
345:
1.19 markus 346: /* Returns 1 if remote host is connected via socket, 0 if not. */
347:
348: int
1.201 ! markus 349: ssh_packet_connection_is_on_socket(struct ssh *ssh)
1.19 markus 350: {
1.201 ! markus 351: struct session_state *state = ssh->state;
1.19 markus 352: struct sockaddr_storage from, to;
353: socklen_t fromlen, tolen;
354:
355: /* filedescriptors in and out are the same, so it's a socket */
1.201 ! markus 356: if (state->connection_in == state->connection_out)
1.19 markus 357: return 1;
358: fromlen = sizeof(from);
359: memset(&from, 0, sizeof(from));
1.201 ! markus 360: if (getpeername(state->connection_in, (struct sockaddr *)&from,
1.161 andreas 361: &fromlen) < 0)
1.19 markus 362: return 0;
363: tolen = sizeof(to);
364: memset(&to, 0, sizeof(to));
1.201 ! markus 365: if (getpeername(state->connection_out, (struct sockaddr *)&to,
1.161 andreas 366: &tolen) < 0)
1.19 markus 367: return 0;
368: if (fromlen != tolen || memcmp(&from, &to, fromlen) != 0)
369: return 0;
370: if (from.ss_family != AF_INET && from.ss_family != AF_INET6)
371: return 0;
372: return 1;
373: }
374:
1.91 markus 375: void
1.201 ! markus 376: ssh_packet_get_bytes(struct ssh *ssh, u_int64_t *ibytes, u_int64_t *obytes)
1.91 markus 377: {
1.201 ! markus 378: if (ibytes)
! 379: *ibytes = ssh->state->p_read.bytes;
! 380: if (obytes)
! 381: *obytes = ssh->state->p_send.bytes;
1.91 markus 382: }
1.125 deraadt 383:
1.91 markus 384: int
1.201 ! markus 385: ssh_packet_connection_af(struct ssh *ssh)
1.19 markus 386: {
387: struct sockaddr_storage to;
1.21 deraadt 388: socklen_t tolen = sizeof(to);
1.19 markus 389:
390: memset(&to, 0, sizeof(to));
1.201 ! markus 391: if (getsockname(ssh->state->connection_out, (struct sockaddr *)&to,
1.161 andreas 392: &tolen) < 0)
1.19 markus 393: return 0;
1.173 djm 394: return to.ss_family;
1.19 markus 395: }
396:
1.1 deraadt 397: /* Sets the connection into non-blocking mode. */
398:
1.2 provos 399: void
1.201 ! markus 400: ssh_packet_set_nonblocking(struct ssh *ssh)
1.1 deraadt 401: {
1.14 markus 402: /* Set the socket into non-blocking mode. */
1.201 ! markus 403: set_nonblock(ssh->state->connection_in);
1.14 markus 404:
1.201 ! markus 405: if (ssh->state->connection_out != ssh->state->connection_in)
! 406: set_nonblock(ssh->state->connection_out);
1.1 deraadt 407: }
408:
409: /* Returns the socket used for reading. */
410:
1.2 provos 411: int
1.201 ! markus 412: ssh_packet_get_connection_in(struct ssh *ssh)
1.1 deraadt 413: {
1.201 ! markus 414: return ssh->state->connection_in;
1.1 deraadt 415: }
416:
417: /* Returns the descriptor used for writing. */
418:
1.2 provos 419: int
1.201 ! markus 420: ssh_packet_get_connection_out(struct ssh *ssh)
1.1 deraadt 421: {
1.201 ! markus 422: return ssh->state->connection_out;
! 423: }
! 424:
! 425: /*
! 426: * Returns the IP-address of the remote host as a string. The returned
! 427: * string must not be freed.
! 428: */
! 429:
! 430: const char *
! 431: ssh_remote_ipaddr(struct ssh *ssh)
! 432: {
! 433: /* Check whether we have cached the ipaddr. */
! 434: if (ssh->remote_ipaddr == NULL)
! 435: ssh->remote_ipaddr = ssh_packet_connection_is_on_socket(ssh) ?
! 436: get_peer_ipaddr(ssh->state->connection_in) :
! 437: strdup("UNKNOWN");
! 438: if (ssh->remote_ipaddr == NULL)
! 439: return "UNKNOWN";
! 440: return ssh->remote_ipaddr;
1.1 deraadt 441: }
442:
443: /* Closes the connection and clears and frees internal data structures. */
444:
1.2 provos 445: void
1.201 ! markus 446: ssh_packet_close(struct ssh *ssh)
1.1 deraadt 447: {
1.201 ! markus 448: struct session_state *state = ssh->state;
! 449: int r;
! 450: u_int mode;
! 451:
! 452: if (!state->initialized)
1.14 markus 453: return;
1.201 ! markus 454: state->initialized = 0;
! 455: if (state->connection_in == state->connection_out) {
! 456: shutdown(state->connection_out, SHUT_RDWR);
! 457: close(state->connection_out);
1.14 markus 458: } else {
1.201 ! markus 459: close(state->connection_in);
! 460: close(state->connection_out);
1.14 markus 461: }
1.201 ! markus 462: sshbuf_free(state->input);
! 463: sshbuf_free(state->output);
! 464: sshbuf_free(state->outgoing_packet);
! 465: sshbuf_free(state->incoming_packet);
! 466: for (mode = 0; mode < MODE_MAX; mode++)
! 467: kex_free_newkeys(state->newkeys[mode]);
! 468: if (state->compression_buffer) {
! 469: sshbuf_free(state->compression_buffer);
! 470: if (state->compression_out_started) {
! 471: z_streamp stream = &state->compression_out_stream;
! 472: debug("compress outgoing: "
! 473: "raw data %llu, compressed %llu, factor %.2f",
! 474: (unsigned long long)stream->total_in,
! 475: (unsigned long long)stream->total_out,
! 476: stream->total_in == 0 ? 0.0 :
! 477: (double) stream->total_out / stream->total_in);
! 478: if (state->compression_out_failures == 0)
! 479: deflateEnd(stream);
! 480: }
! 481: if (state->compression_in_started) {
! 482: z_streamp stream = &state->compression_out_stream;
! 483: debug("compress incoming: "
! 484: "raw data %llu, compressed %llu, factor %.2f",
! 485: (unsigned long long)stream->total_out,
! 486: (unsigned long long)stream->total_in,
! 487: stream->total_out == 0 ? 0.0 :
! 488: (double) stream->total_in / stream->total_out);
! 489: if (state->compression_in_failures == 0)
! 490: inflateEnd(stream);
! 491: }
1.14 markus 492: }
1.201 ! markus 493: if ((r = cipher_cleanup(&state->send_context)) != 0)
! 494: error("%s: cipher_cleanup failed: %s", __func__, ssh_err(r));
! 495: if ((r = cipher_cleanup(&state->receive_context)) != 0)
! 496: error("%s: cipher_cleanup failed: %s", __func__, ssh_err(r));
! 497: if (ssh->remote_ipaddr) {
! 498: free(ssh->remote_ipaddr);
! 499: ssh->remote_ipaddr = NULL;
! 500: }
! 501: free(ssh->state);
! 502: ssh->state = NULL;
1.1 deraadt 503: }
504:
505: /* Sets remote side protocol flags. */
506:
1.2 provos 507: void
1.201 ! markus 508: ssh_packet_set_protocol_flags(struct ssh *ssh, u_int protocol_flags)
1.1 deraadt 509: {
1.201 ! markus 510: ssh->state->remote_protocol_flags = protocol_flags;
1.1 deraadt 511: }
512:
513: /* Returns the remote protocol flags set earlier by the above function. */
514:
1.40 markus 515: u_int
1.201 ! markus 516: ssh_packet_get_protocol_flags(struct ssh *ssh)
1.1 deraadt 517: {
1.201 ! markus 518: return ssh->state->remote_protocol_flags;
1.1 deraadt 519: }
520:
1.16 markus 521: /*
522: * Starts packet compression from the next packet on in both directions.
523: * Level is compression level 1 (fastest) - 9 (slow, best) as in gzip.
524: */
1.1 deraadt 525:
1.201 ! markus 526: static int
! 527: ssh_packet_init_compression(struct ssh *ssh)
1.60 markus 528: {
1.201 ! markus 529: if (!ssh->state->compression_buffer &&
! 530: ((ssh->state->compression_buffer = sshbuf_new()) == NULL))
! 531: return SSH_ERR_ALLOC_FAIL;
! 532: return 0;
1.60 markus 533: }
534:
1.201 ! markus 535: static int
! 536: start_compression_out(struct ssh *ssh, int level)
1.1 deraadt 537: {
1.201 ! markus 538: if (level < 1 || level > 9)
! 539: return SSH_ERR_INVALID_ARGUMENT;
! 540: debug("Enabling compression at level %d.", level);
! 541: if (ssh->state->compression_out_started == 1)
! 542: deflateEnd(&ssh->state->compression_out_stream);
! 543: switch (deflateInit(&ssh->state->compression_out_stream, level)) {
! 544: case Z_OK:
! 545: ssh->state->compression_out_started = 1;
! 546: break;
! 547: case Z_MEM_ERROR:
! 548: return SSH_ERR_ALLOC_FAIL;
! 549: default:
! 550: return SSH_ERR_INTERNAL_ERROR;
! 551: }
! 552: return 0;
1.1 deraadt 553: }
554:
1.201 ! markus 555: static int
! 556: start_compression_in(struct ssh *ssh)
! 557: {
! 558: if (ssh->state->compression_in_started == 1)
! 559: inflateEnd(&ssh->state->compression_in_stream);
! 560: switch (inflateInit(&ssh->state->compression_in_stream)) {
! 561: case Z_OK:
! 562: ssh->state->compression_in_started = 1;
! 563: break;
! 564: case Z_MEM_ERROR:
! 565: return SSH_ERR_ALLOC_FAIL;
! 566: default:
! 567: return SSH_ERR_INTERNAL_ERROR;
! 568: }
! 569: return 0;
! 570: }
1.95 markus 571:
1.201 ! markus 572: int
! 573: ssh_packet_start_compression(struct ssh *ssh, int level)
1.1 deraadt 574: {
1.197 djm 575: int r;
1.97 deraadt 576:
1.201 ! markus 577: if (ssh->state->packet_compression && !compat20)
! 578: return SSH_ERR_INTERNAL_ERROR;
! 579: ssh->state->packet_compression = 1;
! 580: if ((r = ssh_packet_init_compression(ssh)) != 0 ||
! 581: (r = start_compression_in(ssh)) != 0 ||
! 582: (r = start_compression_out(ssh, level)) != 0)
! 583: return r;
! 584: return 0;
1.95 markus 585: }
586:
1.201 ! markus 587: /* XXX remove need for separate compression buffer */
! 588: static int
! 589: compress_buffer(struct ssh *ssh, struct sshbuf *in, struct sshbuf *out)
1.95 markus 590: {
1.201 ! markus 591: u_char buf[4096];
! 592: int r, status;
! 593:
! 594: if (ssh->state->compression_out_started != 1)
! 595: return SSH_ERR_INTERNAL_ERROR;
! 596:
! 597: /* This case is not handled below. */
! 598: if (sshbuf_len(in) == 0)
! 599: return 0;
! 600:
! 601: /* Input is the contents of the input buffer. */
! 602: if ((ssh->state->compression_out_stream.next_in =
! 603: sshbuf_mutable_ptr(in)) == NULL)
! 604: return SSH_ERR_INTERNAL_ERROR;
! 605: ssh->state->compression_out_stream.avail_in = sshbuf_len(in);
! 606:
! 607: /* Loop compressing until deflate() returns with avail_out != 0. */
! 608: do {
! 609: /* Set up fixed-size output buffer. */
! 610: ssh->state->compression_out_stream.next_out = buf;
! 611: ssh->state->compression_out_stream.avail_out = sizeof(buf);
! 612:
! 613: /* Compress as much data into the buffer as possible. */
! 614: status = deflate(&ssh->state->compression_out_stream,
! 615: Z_PARTIAL_FLUSH);
! 616: switch (status) {
! 617: case Z_MEM_ERROR:
! 618: return SSH_ERR_ALLOC_FAIL;
! 619: case Z_OK:
! 620: /* Append compressed data to output_buffer. */
! 621: if ((r = sshbuf_put(out, buf, sizeof(buf) -
! 622: ssh->state->compression_out_stream.avail_out)) != 0)
! 623: return r;
! 624: break;
! 625: case Z_STREAM_ERROR:
! 626: default:
! 627: ssh->state->compression_out_failures++;
! 628: return SSH_ERR_INVALID_FORMAT;
! 629: }
! 630: } while (ssh->state->compression_out_stream.avail_out == 0);
! 631: return 0;
1.1 deraadt 632: }
633:
1.201 ! markus 634: static int
! 635: uncompress_buffer(struct ssh *ssh, struct sshbuf *in, struct sshbuf *out)
1.1 deraadt 636: {
1.201 ! markus 637: u_char buf[4096];
! 638: int r, status;
1.1 deraadt 639:
1.201 ! markus 640: if (ssh->state->compression_in_started != 1)
! 641: return SSH_ERR_INTERNAL_ERROR;
1.25 markus 642:
1.201 ! markus 643: if ((ssh->state->compression_in_stream.next_in =
! 644: sshbuf_mutable_ptr(in)) == NULL)
! 645: return SSH_ERR_INTERNAL_ERROR;
! 646: ssh->state->compression_in_stream.avail_in = sshbuf_len(in);
1.97 deraadt 647:
1.201 ! markus 648: for (;;) {
! 649: /* Set up fixed-size output buffer. */
! 650: ssh->state->compression_in_stream.next_out = buf;
! 651: ssh->state->compression_in_stream.avail_out = sizeof(buf);
! 652:
! 653: status = inflate(&ssh->state->compression_in_stream,
! 654: Z_PARTIAL_FLUSH);
! 655: switch (status) {
! 656: case Z_OK:
! 657: if ((r = sshbuf_put(out, buf, sizeof(buf) -
! 658: ssh->state->compression_in_stream.avail_out)) != 0)
! 659: return r;
! 660: break;
! 661: case Z_BUF_ERROR:
! 662: /*
! 663: * Comments in zlib.h say that we should keep calling
! 664: * inflate() until we get an error. This appears to
! 665: * be the error that we get.
! 666: */
! 667: return 0;
! 668: case Z_DATA_ERROR:
! 669: return SSH_ERR_INVALID_FORMAT;
! 670: case Z_MEM_ERROR:
! 671: return SSH_ERR_ALLOC_FAIL;
! 672: case Z_STREAM_ERROR:
! 673: default:
! 674: ssh->state->compression_in_failures++;
! 675: return SSH_ERR_INTERNAL_ERROR;
! 676: }
! 677: }
! 678: /* NOTREACHED */
1.1 deraadt 679: }
1.125 deraadt 680:
1.201 ! markus 681: /* Serialise compression state into a blob for privsep */
! 682: static int
! 683: ssh_packet_get_compress_state(struct sshbuf *m, struct ssh *ssh)
1.1 deraadt 684: {
1.201 ! markus 685: struct session_state *state = ssh->state;
! 686: struct sshbuf *b;
! 687: int r;
! 688:
! 689: if ((b = sshbuf_new()) == NULL)
! 690: return SSH_ERR_ALLOC_FAIL;
! 691: if (state->compression_in_started) {
! 692: if ((r = sshbuf_put_string(b, &state->compression_in_stream,
! 693: sizeof(state->compression_in_stream))) != 0)
! 694: goto out;
! 695: } else if ((r = sshbuf_put_string(b, NULL, 0)) != 0)
! 696: goto out;
! 697: if (state->compression_out_started) {
! 698: if ((r = sshbuf_put_string(b, &state->compression_out_stream,
! 699: sizeof(state->compression_out_stream))) != 0)
! 700: goto out;
! 701: } else if ((r = sshbuf_put_string(b, NULL, 0)) != 0)
! 702: goto out;
! 703: r = sshbuf_put_stringb(m, b);
! 704: out:
! 705: sshbuf_free(b);
! 706: return r;
1.1 deraadt 707: }
1.125 deraadt 708:
1.201 ! markus 709: /* Deserialise compression state from a blob for privsep */
! 710: static int
! 711: ssh_packet_set_compress_state(struct ssh *ssh, struct sshbuf *m)
1.162 andreas 712: {
1.201 ! markus 713: struct session_state *state = ssh->state;
! 714: struct sshbuf *b = NULL;
! 715: int r;
! 716: const u_char *inblob, *outblob;
! 717: size_t inl, outl;
1.162 andreas 718:
1.201 ! markus 719: if ((r = sshbuf_froms(m, &b)) != 0)
! 720: goto out;
! 721: if ((r = sshbuf_get_string_direct(b, &inblob, &inl)) != 0 ||
! 722: (r = sshbuf_get_string_direct(b, &outblob, &outl)) != 0)
! 723: goto out;
! 724: if (inl == 0)
! 725: state->compression_in_started = 0;
! 726: else if (inl != sizeof(state->compression_in_stream)) {
! 727: r = SSH_ERR_INTERNAL_ERROR;
! 728: goto out;
! 729: } else {
! 730: state->compression_in_started = 1;
! 731: memcpy(&state->compression_in_stream, inblob, inl);
! 732: }
! 733: if (outl == 0)
! 734: state->compression_out_started = 0;
! 735: else if (outl != sizeof(state->compression_out_stream)) {
! 736: r = SSH_ERR_INTERNAL_ERROR;
! 737: goto out;
! 738: } else {
! 739: state->compression_out_started = 1;
! 740: memcpy(&state->compression_out_stream, outblob, outl);
! 741: }
! 742: r = 0;
! 743: out:
! 744: sshbuf_free(b);
! 745: return r;
1.1 deraadt 746: }
1.125 deraadt 747:
1.24 markus 748: void
1.201 ! markus 749: ssh_packet_set_compress_hooks(struct ssh *ssh, void *ctx,
! 750: void *(*allocfunc)(void *, u_int, u_int),
! 751: void (*freefunc)(void *, void *))
! 752: {
! 753: ssh->state->compression_out_stream.zalloc = (alloc_func)allocfunc;
! 754: ssh->state->compression_out_stream.zfree = (free_func)freefunc;
! 755: ssh->state->compression_out_stream.opaque = ctx;
! 756: ssh->state->compression_in_stream.zalloc = (alloc_func)allocfunc;
! 757: ssh->state->compression_in_stream.zfree = (free_func)freefunc;
! 758: ssh->state->compression_in_stream.opaque = ctx;
1.24 markus 759: }
1.125 deraadt 760:
1.201 ! markus 761: /*
! 762: * Causes any further packets to be encrypted using the given key. The same
! 763: * key is used for both sending and reception. However, both directions are
! 764: * encrypted independently of each other.
! 765: */
1.125 deraadt 766:
1.195 markus 767: #ifdef WITH_OPENSSL
1.2 provos 768: void
1.201 ! markus 769: ssh_packet_set_encryption_key(struct ssh *ssh, const u_char *key, u_int keylen, int number)
1.1 deraadt 770: {
1.201 ! markus 771: struct session_state *state = ssh->state;
! 772: const struct sshcipher *cipher = cipher_by_number(number);
! 773: int r;
! 774: const char *wmsg;
1.125 deraadt 775:
1.201 ! markus 776: if (cipher == NULL)
! 777: fatal("%s: unknown cipher number %d", __func__, number);
! 778: if (keylen < 20)
! 779: fatal("%s: keylen too small: %d", __func__, keylen);
! 780: if (keylen > SSH_SESSION_KEY_LENGTH)
! 781: fatal("%s: keylen too big: %d", __func__, keylen);
! 782: memcpy(state->ssh1_key, key, keylen);
! 783: state->ssh1_keylen = keylen;
! 784: if ((r = cipher_init(&state->send_context, cipher, key, keylen,
! 785: NULL, 0, CIPHER_ENCRYPT)) != 0 ||
! 786: (r = cipher_init(&state->receive_context, cipher, key, keylen,
! 787: NULL, 0, CIPHER_DECRYPT) != 0))
! 788: fatal("%s: cipher_init failed: %s", __func__, ssh_err(r));
! 789: if (!state->cipher_warning_done &&
! 790: ((wmsg = cipher_warning_message(&state->send_context)) != NULL ||
! 791: (wmsg = cipher_warning_message(&state->send_context)) != NULL)) {
! 792: error("Warning: %s", wmsg);
! 793: state->cipher_warning_done = 1;
! 794: }
1.170 djm 795: }
1.195 markus 796: #endif
1.170 djm 797:
1.16 markus 798: /*
799: * Finalizes and sends the packet. If the encryption key has been set,
800: * encrypts the packet before sending.
801: */
1.14 markus 802:
1.201 ! markus 803: int
! 804: ssh_packet_send1(struct ssh *ssh)
1.1 deraadt 805: {
1.201 ! markus 806: struct session_state *state = ssh->state;
1.89 markus 807: u_char buf[8], *cp;
1.201 ! markus 808: int r, padding, len;
1.40 markus 809: u_int checksum;
1.14 markus 810:
1.16 markus 811: /*
812: * If using packet compression, compress the payload of the outgoing
813: * packet.
814: */
1.201 ! markus 815: if (state->packet_compression) {
! 816: sshbuf_reset(state->compression_buffer);
1.14 markus 817: /* Skip padding. */
1.201 ! markus 818: if ((r = sshbuf_consume(state->outgoing_packet, 8)) != 0)
! 819: goto out;
1.14 markus 820: /* padding */
1.201 ! markus 821: if ((r = sshbuf_put(state->compression_buffer,
! 822: "\0\0\0\0\0\0\0\0", 8)) != 0)
! 823: goto out;
! 824: if ((r = compress_buffer(ssh, state->outgoing_packet,
! 825: state->compression_buffer)) != 0)
! 826: goto out;
! 827: sshbuf_reset(state->outgoing_packet);
! 828: if ((r = sshbuf_putb(state->outgoing_packet,
! 829: state->compression_buffer)) != 0)
! 830: goto out;
1.14 markus 831: }
832: /* Compute packet length without padding (add checksum, remove padding). */
1.201 ! markus 833: len = sshbuf_len(state->outgoing_packet) + 4 - 8;
1.14 markus 834:
1.32 markus 835: /* Insert padding. Initialized to zero in packet_start1() */
1.14 markus 836: padding = 8 - len % 8;
1.201 ! markus 837: if (!state->send_context.plaintext) {
! 838: cp = sshbuf_mutable_ptr(state->outgoing_packet);
! 839: if (cp == NULL) {
! 840: r = SSH_ERR_INTERNAL_ERROR;
! 841: goto out;
1.14 markus 842: }
1.201 ! markus 843: arc4random_buf(cp + 8 - padding, padding);
1.14 markus 844: }
1.201 ! markus 845: if ((r = sshbuf_consume(state->outgoing_packet, 8 - padding)) != 0)
! 846: goto out;
1.14 markus 847:
848: /* Add check bytes. */
1.201 ! markus 849: checksum = ssh_crc32(sshbuf_ptr(state->outgoing_packet),
! 850: sshbuf_len(state->outgoing_packet));
! 851: POKE_U32(buf, checksum);
! 852: if ((r = sshbuf_put(state->outgoing_packet, buf, 4)) != 0)
! 853: goto out;
1.1 deraadt 854:
855: #ifdef PACKET_DEBUG
1.14 markus 856: fprintf(stderr, "packet_send plain: ");
1.201 ! markus 857: sshbuf_dump(state->outgoing_packet, stderr);
1.1 deraadt 858: #endif
859:
1.14 markus 860: /* Append to output. */
1.201 ! markus 861: POKE_U32(buf, len);
! 862: if ((r = sshbuf_put(state->output, buf, 4)) != 0)
! 863: goto out;
! 864: if ((r = sshbuf_reserve(state->output,
! 865: sshbuf_len(state->outgoing_packet), &cp)) != 0)
! 866: goto out;
! 867: if ((r = cipher_crypt(&state->send_context, 0, cp,
! 868: sshbuf_ptr(state->outgoing_packet),
! 869: sshbuf_len(state->outgoing_packet), 0, 0)) != 0)
! 870: goto out;
1.14 markus 871:
1.1 deraadt 872: #ifdef PACKET_DEBUG
1.14 markus 873: fprintf(stderr, "encrypted: ");
1.201 ! markus 874: sshbuf_dump(state->output, stderr);
1.1 deraadt 875: #endif
1.201 ! markus 876: state->p_send.packets++;
! 877: state->p_send.bytes += len +
! 878: sshbuf_len(state->outgoing_packet);
! 879: sshbuf_reset(state->outgoing_packet);
1.1 deraadt 880:
1.16 markus 881: /*
1.120 djm 882: * Note that the packet is now only buffered in output. It won't be
1.16 markus 883: * actually sent until packet_write_wait or packet_write_poll is
884: * called.
885: */
1.201 ! markus 886: r = 0;
! 887: out:
! 888: return r;
1.1 deraadt 889: }
890:
1.201 ! markus 891: int
! 892: ssh_set_newkeys(struct ssh *ssh, int mode)
1.57 markus 893: {
1.201 ! markus 894: struct session_state *state = ssh->state;
! 895: struct sshenc *enc;
! 896: struct sshmac *mac;
! 897: struct sshcomp *comp;
! 898: struct sshcipher_ctx *cc;
1.105 markus 899: u_int64_t *max_blocks;
1.201 ! markus 900: const char *wmsg;
1.197 djm 901: int r, crypt_type;
1.57 markus 902:
1.100 markus 903: debug2("set_newkeys: mode %d", mode);
1.57 markus 904:
1.88 markus 905: if (mode == MODE_OUT) {
1.201 ! markus 906: cc = &state->send_context;
1.115 avsm 907: crypt_type = CIPHER_ENCRYPT;
1.201 ! markus 908: state->p_send.packets = state->p_send.blocks = 0;
! 909: max_blocks = &state->max_blocks_out;
1.88 markus 910: } else {
1.201 ! markus 911: cc = &state->receive_context;
1.115 avsm 912: crypt_type = CIPHER_DECRYPT;
1.201 ! markus 913: state->p_read.packets = state->p_read.blocks = 0;
! 914: max_blocks = &state->max_blocks_in;
1.88 markus 915: }
1.201 ! markus 916: if (state->newkeys[mode] != NULL) {
1.100 markus 917: debug("set_newkeys: rekeying");
1.201 ! markus 918: if ((r = cipher_cleanup(cc)) != 0)
! 919: return r;
! 920: enc = &state->newkeys[mode]->enc;
! 921: mac = &state->newkeys[mode]->mac;
! 922: comp = &state->newkeys[mode]->comp;
1.148 pvalchev 923: mac_clear(mac);
1.192 djm 924: explicit_bzero(enc->iv, enc->iv_len);
925: explicit_bzero(enc->key, enc->key_len);
926: explicit_bzero(mac->key, mac->key_len);
1.186 djm 927: free(enc->name);
928: free(enc->iv);
929: free(enc->key);
930: free(mac->name);
931: free(mac->key);
932: free(comp->name);
1.201 ! markus 933: free(state->newkeys[mode]);
1.57 markus 934: }
1.201 ! markus 935: /* move newkeys from kex to state */
! 936: if ((state->newkeys[mode] = ssh->kex->newkeys[mode]) == NULL)
! 937: return SSH_ERR_INTERNAL_ERROR;
! 938: ssh->kex->newkeys[mode] = NULL;
! 939: enc = &state->newkeys[mode]->enc;
! 940: mac = &state->newkeys[mode]->mac;
! 941: comp = &state->newkeys[mode]->comp;
! 942: if (cipher_authlen(enc->cipher) == 0) {
! 943: if ((r = mac_init(mac)) != 0)
! 944: return r;
! 945: }
! 946: mac->enabled = 1;
1.57 markus 947: DBG(debug("cipher_init_context: %d", mode));
1.197 djm 948: if ((r = cipher_init(cc, enc->cipher, enc->key, enc->key_len,
949: enc->iv, enc->iv_len, crypt_type)) != 0)
1.201 ! markus 950: return r;
! 951: if (!state->cipher_warning_done &&
! 952: (wmsg = cipher_warning_message(cc)) != NULL) {
! 953: error("Warning: %s", wmsg);
! 954: state->cipher_warning_done = 1;
! 955: }
1.91 markus 956: /* Deleting the keys does not gain extra security */
1.192 djm 957: /* explicit_bzero(enc->iv, enc->block_size);
958: explicit_bzero(enc->key, enc->key_len);
959: explicit_bzero(mac->key, mac->key_len); */
1.118 markus 960: if ((comp->type == COMP_ZLIB ||
1.161 andreas 961: (comp->type == COMP_DELAYED &&
1.201 ! markus 962: state->after_authentication)) && comp->enabled == 0) {
! 963: if ((r = ssh_packet_init_compression(ssh)) < 0)
! 964: return r;
! 965: if (mode == MODE_OUT) {
! 966: if ((r = start_compression_out(ssh, 6)) != 0)
! 967: return r;
! 968: } else {
! 969: if ((r = start_compression_in(ssh)) != 0)
! 970: return r;
! 971: }
1.57 markus 972: comp->enabled = 1;
973: }
1.109 markus 974: /*
975: * The 2^(blocksize*2) limit is too expensive for 3DES,
976: * blowfish, etc, so enforce a 1GB limit for small blocksizes.
977: */
978: if (enc->block_size >= 16)
979: *max_blocks = (u_int64_t)1 << (enc->block_size*2);
980: else
981: *max_blocks = ((u_int64_t)1 << 30) / enc->block_size;
1.201 ! markus 982: if (state->rekey_limit)
1.161 andreas 983: *max_blocks = MIN(*max_blocks,
1.201 ! markus 984: state->rekey_limit / enc->block_size);
! 985: return 0;
1.57 markus 986: }
987:
1.16 markus 988: /*
1.118 markus 989: * Delayed compression for SSH2 is enabled after authentication:
1.143 dtucker 990: * This happens on the server side after a SSH2_MSG_USERAUTH_SUCCESS is sent,
1.118 markus 991: * and on the client side after a SSH2_MSG_USERAUTH_SUCCESS is received.
992: */
1.201 ! markus 993: static int
! 994: ssh_packet_enable_delayed_compress(struct ssh *ssh)
1.118 markus 995: {
1.201 ! markus 996: struct session_state *state = ssh->state;
! 997: struct sshcomp *comp = NULL;
! 998: int r, mode;
1.118 markus 999:
1000: /*
1001: * Remember that we are past the authentication step, so rekeying
1002: * with COMP_DELAYED will turn on compression immediately.
1003: */
1.201 ! markus 1004: state->after_authentication = 1;
1.118 markus 1005: for (mode = 0; mode < MODE_MAX; mode++) {
1.145 markus 1006: /* protocol error: USERAUTH_SUCCESS received before NEWKEYS */
1.201 ! markus 1007: if (state->newkeys[mode] == NULL)
1.145 markus 1008: continue;
1.201 ! markus 1009: comp = &state->newkeys[mode]->comp;
1.118 markus 1010: if (comp && !comp->enabled && comp->type == COMP_DELAYED) {
1.201 ! markus 1011: if ((r = ssh_packet_init_compression(ssh)) != 0)
! 1012: return r;
! 1013: if (mode == MODE_OUT) {
! 1014: if ((r = start_compression_out(ssh, 6)) != 0)
! 1015: return r;
! 1016: } else {
! 1017: if ((r = start_compression_in(ssh)) != 0)
! 1018: return r;
! 1019: }
1.118 markus 1020: comp->enabled = 1;
1021: }
1022: }
1.201 ! markus 1023: return 0;
1.118 markus 1024: }
1025:
1026: /*
1.25 markus 1027: * Finalize packet in SSH2 format (compress, mac, encrypt, enqueue)
1028: */
1.201 ! markus 1029: int
! 1030: ssh_packet_send2_wrapped(struct ssh *ssh)
1.25 markus 1031: {
1.201 ! markus 1032: struct session_state *state = ssh->state;
1.200 markus 1033: u_char type, *cp, macbuf[SSH_DIGEST_MAX_LENGTH];
1.178 markus 1034: u_char padlen, pad = 0;
1.201 ! markus 1035: u_int authlen = 0, aadlen = 0;
! 1036: u_int len;
! 1037: struct sshenc *enc = NULL;
! 1038: struct sshmac *mac = NULL;
! 1039: struct sshcomp *comp = NULL;
! 1040: int r, block_size;
! 1041:
! 1042: if (state->newkeys[MODE_OUT] != NULL) {
! 1043: enc = &state->newkeys[MODE_OUT]->enc;
! 1044: mac = &state->newkeys[MODE_OUT]->mac;
! 1045: comp = &state->newkeys[MODE_OUT]->comp;
1.180 markus 1046: /* disable mac for authenticated encryption */
1047: if ((authlen = cipher_authlen(enc->cipher)) != 0)
1048: mac = NULL;
1.25 markus 1049: }
1.88 markus 1050: block_size = enc ? enc->block_size : 8;
1.180 markus 1051: aadlen = (mac && mac->enabled && mac->etm) || authlen ? 4 : 0;
1.25 markus 1052:
1.201 ! markus 1053: type = (sshbuf_ptr(state->outgoing_packet))[5];
1.25 markus 1054:
1055: #ifdef PACKET_DEBUG
1056: fprintf(stderr, "plain: ");
1.201 ! markus 1057: sshbuf_dump(state->outgoing_packet, stderr);
1.25 markus 1058: #endif
1059:
1060: if (comp && comp->enabled) {
1.201 ! markus 1061: len = sshbuf_len(state->outgoing_packet);
1.25 markus 1062: /* skip header, compress only payload */
1.201 ! markus 1063: if ((r = sshbuf_consume(state->outgoing_packet, 5)) != 0)
! 1064: goto out;
! 1065: sshbuf_reset(state->compression_buffer);
! 1066: if ((r = compress_buffer(ssh, state->outgoing_packet,
! 1067: state->compression_buffer)) != 0)
! 1068: goto out;
! 1069: sshbuf_reset(state->outgoing_packet);
! 1070: if ((r = sshbuf_put(state->outgoing_packet,
! 1071: "\0\0\0\0\0", 5)) != 0 ||
! 1072: (r = sshbuf_putb(state->outgoing_packet,
! 1073: state->compression_buffer)) != 0)
! 1074: goto out;
! 1075: DBG(debug("compression: raw %d compressed %zd", len,
! 1076: sshbuf_len(state->outgoing_packet)));
1.25 markus 1077: }
1078:
1079: /* sizeof (packet_len + pad_len + payload) */
1.201 ! markus 1080: len = sshbuf_len(state->outgoing_packet);
1.25 markus 1081:
1082: /*
1083: * calc size of padding, alloc space, get random data,
1084: * minimum padding is 4 bytes
1085: */
1.178 markus 1086: len -= aadlen; /* packet length is not encrypted for EtM modes */
1.25 markus 1087: padlen = block_size - (len % block_size);
1088: if (padlen < 4)
1089: padlen += block_size;
1.201 ! markus 1090: if (state->extra_pad) {
1.71 markus 1091: /* will wrap if extra_pad+padlen > 255 */
1.201 ! markus 1092: state->extra_pad =
! 1093: roundup(state->extra_pad, block_size);
! 1094: pad = state->extra_pad -
! 1095: ((len + padlen) % state->extra_pad);
1.193 djm 1096: DBG(debug3("%s: adding %d (len %d padlen %d extra_pad %d)",
1.201 ! markus 1097: __func__, pad, len, padlen, state->extra_pad));
1.71 markus 1098: padlen += pad;
1.201 ! markus 1099: state->extra_pad = 0;
1.71 markus 1100: }
1.201 ! markus 1101: if ((r = sshbuf_reserve(state->outgoing_packet, padlen, &cp)) != 0)
! 1102: goto out;
! 1103: if (enc && !state->send_context.plaintext) {
1.32 markus 1104: /* random padding */
1.201 ! markus 1105: arc4random_buf(cp, padlen);
1.32 markus 1106: } else {
1107: /* clear padding */
1.192 djm 1108: explicit_bzero(cp, padlen);
1.25 markus 1109: }
1.178 markus 1110: /* sizeof (packet_len + pad_len + payload + padding) */
1.201 ! markus 1111: len = sshbuf_len(state->outgoing_packet);
! 1112: cp = sshbuf_mutable_ptr(state->outgoing_packet);
! 1113: if (cp == NULL) {
! 1114: r = SSH_ERR_INTERNAL_ERROR;
! 1115: goto out;
! 1116: }
1.25 markus 1117: /* packet_length includes payload, padding and padding length field */
1.201 ! markus 1118: POKE_U32(cp, len - 4);
1.89 markus 1119: cp[4] = padlen;
1.178 markus 1120: DBG(debug("send: len %d (includes padlen %d, aadlen %d)",
1121: len, padlen, aadlen));
1.25 markus 1122:
1123: /* compute MAC over seqnr and packet(length fields, payload, padding) */
1.178 markus 1124: if (mac && mac->enabled && !mac->etm) {
1.201 ! markus 1125: if ((r = mac_compute(mac, state->p_send.seqnr,
! 1126: sshbuf_ptr(state->outgoing_packet), len,
1.200 markus 1127: macbuf, sizeof(macbuf))) != 0)
1.201 ! markus 1128: goto out;
! 1129: DBG(debug("done calc MAC out #%d", state->p_send.seqnr));
1.25 markus 1130: }
1131: /* encrypt packet and append to output buffer. */
1.201 ! markus 1132: if ((r = sshbuf_reserve(state->output,
! 1133: sshbuf_len(state->outgoing_packet) + authlen, &cp)) != 0)
! 1134: goto out;
! 1135: if ((r = cipher_crypt(&state->send_context, state->p_send.seqnr, cp,
! 1136: sshbuf_ptr(state->outgoing_packet),
! 1137: len - aadlen, aadlen, authlen)) != 0)
! 1138: goto out;
1.25 markus 1139: /* append unencrypted MAC */
1.178 markus 1140: if (mac && mac->enabled) {
1141: if (mac->etm) {
1142: /* EtM: compute mac over aadlen + cipher text */
1.201 ! markus 1143: if ((r = mac_compute(mac, state->p_send.seqnr,
! 1144: cp, len, macbuf, sizeof(macbuf))) != 0)
! 1145: goto out;
1.178 markus 1146: DBG(debug("done calc MAC(EtM) out #%d",
1.201 ! markus 1147: state->p_send.seqnr));
1.178 markus 1148: }
1.201 ! markus 1149: if ((r = sshbuf_put(state->output, macbuf, mac->mac_len)) != 0)
! 1150: goto out;
1.178 markus 1151: }
1.25 markus 1152: #ifdef PACKET_DEBUG
1153: fprintf(stderr, "encrypted: ");
1.201 ! markus 1154: sshbuf_dump(state->output, stderr);
1.25 markus 1155: #endif
1.29 markus 1156: /* increment sequence number for outgoing packets */
1.201 ! markus 1157: if (++state->p_send.seqnr == 0)
1.106 itojun 1158: logit("outgoing seqnr wraps around");
1.201 ! markus 1159: if (++state->p_send.packets == 0)
! 1160: if (!(ssh->compat & SSH_BUG_NOREKEY))
! 1161: return SSH_ERR_NEED_REKEY;
! 1162: state->p_send.blocks += len / block_size;
! 1163: state->p_send.bytes += len;
! 1164: sshbuf_reset(state->outgoing_packet);
1.25 markus 1165:
1.57 markus 1166: if (type == SSH2_MSG_NEWKEYS)
1.201 ! markus 1167: r = ssh_set_newkeys(ssh, MODE_OUT);
! 1168: else if (type == SSH2_MSG_USERAUTH_SUCCESS && state->server_side)
! 1169: r = ssh_packet_enable_delayed_compress(ssh);
! 1170: else
! 1171: r = 0;
! 1172: out:
! 1173: return r;
1.25 markus 1174: }
1175:
1.201 ! markus 1176: int
! 1177: ssh_packet_send2(struct ssh *ssh)
1.105 markus 1178: {
1.201 ! markus 1179: struct session_state *state = ssh->state;
1.105 markus 1180: struct packet *p;
1.201 ! markus 1181: u_char type;
! 1182: int r;
1.105 markus 1183:
1.201 ! markus 1184: type = sshbuf_ptr(state->outgoing_packet)[5];
1.105 markus 1185:
1186: /* during rekeying we can only send key exchange messages */
1.201 ! markus 1187: if (state->rekeying) {
1.175 markus 1188: if ((type < SSH2_MSG_TRANSPORT_MIN) ||
1189: (type > SSH2_MSG_TRANSPORT_MAX) ||
1190: (type == SSH2_MSG_SERVICE_REQUEST) ||
1191: (type == SSH2_MSG_SERVICE_ACCEPT)) {
1.105 markus 1192: debug("enqueue packet: %u", type);
1.201 ! markus 1193: p = calloc(1, sizeof(*p));
! 1194: if (p == NULL)
! 1195: return SSH_ERR_ALLOC_FAIL;
1.105 markus 1196: p->type = type;
1.201 ! markus 1197: p->payload = state->outgoing_packet;
! 1198: TAILQ_INSERT_TAIL(&state->outgoing, p, next);
! 1199: state->outgoing_packet = sshbuf_new();
! 1200: if (state->outgoing_packet == NULL)
! 1201: return SSH_ERR_ALLOC_FAIL;
! 1202: return 0;
1.105 markus 1203: }
1204: }
1205:
1206: /* rekeying starts with sending KEXINIT */
1207: if (type == SSH2_MSG_KEXINIT)
1.201 ! markus 1208: state->rekeying = 1;
1.105 markus 1209:
1.201 ! markus 1210: if ((r = ssh_packet_send2_wrapped(ssh)) != 0)
! 1211: return r;
1.105 markus 1212:
1213: /* after a NEWKEYS message we can send the complete queue */
1214: if (type == SSH2_MSG_NEWKEYS) {
1.201 ! markus 1215: state->rekeying = 0;
! 1216: state->rekey_time = monotime();
! 1217: while ((p = TAILQ_FIRST(&state->outgoing))) {
1.105 markus 1218: type = p->type;
1219: debug("dequeue packet: %u", type);
1.201 ! markus 1220: sshbuf_free(state->outgoing_packet);
! 1221: state->outgoing_packet = p->payload;
! 1222: TAILQ_REMOVE(&state->outgoing, p, next);
1.186 djm 1223: free(p);
1.201 ! markus 1224: if ((r = ssh_packet_send2_wrapped(ssh)) != 0)
! 1225: return r;
1.105 markus 1226: }
1227: }
1.201 ! markus 1228: return 0;
1.25 markus 1229: }
1230:
1231: /*
1.16 markus 1232: * Waits until a packet has been received, and returns its type. Note that
1233: * no other data is processed until this returns, so this function should not
1234: * be used during the interactive session.
1235: */
1.1 deraadt 1236:
1.2 provos 1237: int
1.201 ! markus 1238: ssh_packet_read_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
1.1 deraadt 1239: {
1.201 ! markus 1240: struct session_state *state = ssh->state;
! 1241: int len, r, ms_remain, cont;
1.56 millert 1242: fd_set *setp;
1.14 markus 1243: char buf[8192];
1.155 deraadt 1244: struct timeval timeout, start, *timeoutp = NULL;
1245:
1.25 markus 1246: DBG(debug("packet_read()"));
1.14 markus 1247:
1.201 ! markus 1248: setp = (fd_set *)calloc(howmany(state->connection_in + 1,
1.161 andreas 1249: NFDBITS), sizeof(fd_mask));
1.201 ! markus 1250: if (setp == NULL)
! 1251: return SSH_ERR_ALLOC_FAIL;
1.56 millert 1252:
1.14 markus 1253: /* Since we are blocking, ensure that all written packets have been sent. */
1.201 ! markus 1254: ssh_packet_write_wait(ssh);
1.14 markus 1255:
1256: /* Stay in the loop until we have received a complete packet. */
1257: for (;;) {
1258: /* Try to read a packet from the buffer. */
1.201 ! markus 1259: r = ssh_packet_read_poll_seqnr(ssh, typep, seqnr_p);
! 1260: if (r != 0)
! 1261: break;
1.62 markus 1262: if (!compat20 && (
1.201 ! markus 1263: *typep == SSH_SMSG_SUCCESS
! 1264: || *typep == SSH_SMSG_FAILURE
! 1265: || *typep == SSH_CMSG_EOF
! 1266: || *typep == SSH_CMSG_EXIT_CONFIRMATION))
! 1267: if ((r = sshpkt_get_end(ssh)) != 0)
! 1268: break;
1.14 markus 1269: /* If we got a packet, return it. */
1.201 ! markus 1270: if (*typep != SSH_MSG_NONE)
! 1271: break;
1.16 markus 1272: /*
1273: * Otherwise, wait for some data to arrive, add it to the
1274: * buffer, and try again.
1275: */
1.201 ! markus 1276: memset(setp, 0, howmany(state->connection_in + 1,
1.161 andreas 1277: NFDBITS) * sizeof(fd_mask));
1.201 ! markus 1278: FD_SET(state->connection_in, setp);
1.16 markus 1279:
1.201 ! markus 1280: if (state->packet_timeout_ms > 0) {
! 1281: ms_remain = state->packet_timeout_ms;
1.154 dtucker 1282: timeoutp = &timeout;
1283: }
1.14 markus 1284: /* Wait for some data to arrive. */
1.154 dtucker 1285: for (;;) {
1.201 ! markus 1286: if (state->packet_timeout_ms != -1) {
1.154 dtucker 1287: ms_to_timeval(&timeout, ms_remain);
1288: gettimeofday(&start, NULL);
1289: }
1.201 ! markus 1290: if ((r = select(state->connection_in + 1, setp,
1.161 andreas 1291: NULL, NULL, timeoutp)) >= 0)
1.154 dtucker 1292: break;
1.161 andreas 1293: if (errno != EAGAIN && errno != EINTR)
1.154 dtucker 1294: break;
1.201 ! markus 1295: if (state->packet_timeout_ms == -1)
1.154 dtucker 1296: continue;
1297: ms_subtract_diff(&start, &ms_remain);
1298: if (ms_remain <= 0) {
1.201 ! markus 1299: r = 0;
1.154 dtucker 1300: break;
1301: }
1302: }
1.201 ! markus 1303: if (r == 0) {
1.154 dtucker 1304: logit("Connection to %.200s timed out while "
1.201 ! markus 1305: "waiting to read", ssh_remote_ipaddr(ssh));
1.154 dtucker 1306: cleanup_exit(255);
1307: }
1.14 markus 1308: /* Read data from the socket. */
1.163 andreas 1309: do {
1310: cont = 0;
1.201 ! markus 1311: len = roaming_read(state->connection_in, buf,
1.163 andreas 1312: sizeof(buf), &cont);
1313: } while (len == 0 && cont);
1.18 markus 1314: if (len == 0) {
1.201 ! markus 1315: logit("Connection closed by %.200s",
! 1316: ssh_remote_ipaddr(ssh));
1.112 markus 1317: cleanup_exit(255);
1.18 markus 1318: }
1.14 markus 1319: if (len < 0)
1320: fatal("Read from socket failed: %.100s", strerror(errno));
1321: /* Append it to the buffer. */
1.201 ! markus 1322: ssh_packet_process_incoming(ssh, buf, len);
1.14 markus 1323: }
1.201 ! markus 1324: free(setp);
! 1325: return r;
1.1 deraadt 1326: }
1327:
1.77 djm 1328: int
1.201 ! markus 1329: ssh_packet_read(struct ssh *ssh)
1.77 djm 1330: {
1.201 ! markus 1331: u_char type;
! 1332: int r;
! 1333:
! 1334: if ((r = ssh_packet_read_seqnr(ssh, &type, NULL)) != 0)
! 1335: fatal("%s: %s", __func__, ssh_err(r));
! 1336: return type;
1.77 djm 1337: }
1338:
1.16 markus 1339: /*
1340: * Waits until a packet has been received, verifies that its type matches
1341: * that given, and gives a fatal error and exits if there is a mismatch.
1342: */
1.1 deraadt 1343:
1.2 provos 1344: void
1.201 ! markus 1345: ssh_packet_read_expect(struct ssh *ssh, int expected_type)
1.1 deraadt 1346: {
1.14 markus 1347: int type;
1.1 deraadt 1348:
1.201 ! markus 1349: type = ssh_packet_read(ssh);
1.14 markus 1350: if (type != expected_type)
1.201 ! markus 1351: ssh_packet_disconnect(ssh,
! 1352: "Protocol error: expected packet type %d, got %d",
1.25 markus 1353: expected_type, type);
1.1 deraadt 1354: }
1355:
1356: /* Checks if a full packet is available in the data received so far via
1.14 markus 1357: * packet_process_incoming. If so, reads the packet; otherwise returns
1358: * SSH_MSG_NONE. This does not wait for data from the connection.
1359: *
1.150 dtucker 1360: * SSH_MSG_DISCONNECT is handled specially here. Also,
1361: * SSH_MSG_IGNORE messages are skipped by this function and are never returned
1362: * to higher levels.
1.14 markus 1363: */
1.1 deraadt 1364:
1.201 ! markus 1365: int
! 1366: ssh_packet_read_poll1(struct ssh *ssh, u_char *typep)
1.1 deraadt 1367: {
1.201 ! markus 1368: struct session_state *state = ssh->state;
1.40 markus 1369: u_int len, padded_len;
1.201 ! markus 1370: const u_char *cp;
! 1371: u_char *p;
1.40 markus 1372: u_int checksum, stored_checksum;
1.201 ! markus 1373: int r;
! 1374:
! 1375: *typep = SSH_MSG_NONE;
1.14 markus 1376:
1377: /* Check if input size is less than minimum packet size. */
1.201 ! markus 1378: if (sshbuf_len(state->input) < 4 + 8)
! 1379: return 0;
1.14 markus 1380: /* Get length of incoming packet. */
1.201 ! markus 1381: len = PEEK_U32(sshbuf_ptr(state->input));
1.14 markus 1382: if (len < 1 + 2 + 2 || len > 256 * 1024)
1.201 ! markus 1383: ssh_packet_disconnect(ssh, "Bad packet length %u.",
! 1384: len);
1.14 markus 1385: padded_len = (len + 8) & ~7;
1386:
1387: /* Check if the packet has been entirely received. */
1.201 ! markus 1388: if (sshbuf_len(state->input) < 4 + padded_len)
! 1389: return 0;
1.14 markus 1390:
1391: /* The entire packet is in buffer. */
1392:
1393: /* Consume packet length. */
1.201 ! markus 1394: if ((r = sshbuf_consume(state->input, 4)) != 0)
! 1395: goto out;
1.14 markus 1396:
1.62 markus 1397: /*
1398: * Cryptographic attack detector for ssh
1399: * (C)1998 CORE-SDI, Buenos Aires Argentina
1400: * Ariel Futoransky(futo@core-sdi.com)
1401: */
1.201 ! markus 1402: if (!state->receive_context.plaintext) {
! 1403: switch (detect_attack(&state->deattack,
! 1404: sshbuf_ptr(state->input), padded_len)) {
! 1405: case DEATTACK_OK:
! 1406: break;
1.144 djm 1407: case DEATTACK_DETECTED:
1.201 ! markus 1408: ssh_packet_disconnect(ssh,
! 1409: "crc32 compensation attack: network attack detected"
! 1410: );
1.144 djm 1411: case DEATTACK_DOS_DETECTED:
1.201 ! markus 1412: ssh_packet_disconnect(ssh,
! 1413: "deattack denial of service detected");
! 1414: default:
! 1415: ssh_packet_disconnect(ssh, "deattack error");
1.144 djm 1416: }
1417: }
1.62 markus 1418:
1419: /* Decrypt data to incoming_packet. */
1.201 ! markus 1420: sshbuf_reset(state->incoming_packet);
! 1421: if ((r = sshbuf_reserve(state->incoming_packet, padded_len, &p)) != 0)
! 1422: goto out;
! 1423: if ((r = cipher_crypt(&state->receive_context, 0, p,
! 1424: sshbuf_ptr(state->input), padded_len, 0, 0)) != 0)
! 1425: goto out;
1.62 markus 1426:
1.201 ! markus 1427: if ((r = sshbuf_consume(state->input, padded_len)) != 0)
! 1428: goto out;
1.1 deraadt 1429:
1430: #ifdef PACKET_DEBUG
1.14 markus 1431: fprintf(stderr, "read_poll plain: ");
1.201 ! markus 1432: sshbuf_dump(state->incoming_packet, stderr);
1.1 deraadt 1433: #endif
1434:
1.14 markus 1435: /* Compute packet checksum. */
1.201 ! markus 1436: checksum = ssh_crc32(sshbuf_ptr(state->incoming_packet),
! 1437: sshbuf_len(state->incoming_packet) - 4);
1.14 markus 1438:
1439: /* Skip padding. */
1.201 ! markus 1440: if ((r = sshbuf_consume(state->incoming_packet, 8 - len % 8)) != 0)
! 1441: goto out;
1.14 markus 1442:
1443: /* Test check bytes. */
1.201 ! markus 1444: if (len != sshbuf_len(state->incoming_packet))
! 1445: ssh_packet_disconnect(ssh,
! 1446: "packet_read_poll1: len %d != sshbuf_len %zd.",
! 1447: len, sshbuf_len(state->incoming_packet));
1.14 markus 1448:
1.201 ! markus 1449: cp = sshbuf_ptr(state->incoming_packet) + len - 4;
! 1450: stored_checksum = PEEK_U32(cp);
1.14 markus 1451: if (checksum != stored_checksum)
1.201 ! markus 1452: ssh_packet_disconnect(ssh,
! 1453: "Corrupted check bytes on input.");
! 1454: if ((r = sshbuf_consume_end(state->incoming_packet, 4)) < 0)
! 1455: goto out;
! 1456:
! 1457: if (state->packet_compression) {
! 1458: sshbuf_reset(state->compression_buffer);
! 1459: if ((r = uncompress_buffer(ssh, state->incoming_packet,
! 1460: state->compression_buffer)) != 0)
! 1461: goto out;
! 1462: sshbuf_reset(state->incoming_packet);
! 1463: if ((r = sshbuf_putb(state->incoming_packet,
! 1464: state->compression_buffer)) != 0)
! 1465: goto out;
! 1466: }
! 1467: state->p_read.packets++;
! 1468: state->p_read.bytes += padded_len + 4;
! 1469: if ((r = sshbuf_get_u8(state->incoming_packet, typep)) != 0)
! 1470: goto out;
! 1471: if (*typep < SSH_MSG_MIN || *typep > SSH_MSG_MAX)
! 1472: ssh_packet_disconnect(ssh,
! 1473: "Invalid ssh1 packet type: %d", *typep);
! 1474: r = 0;
! 1475: out:
! 1476: return r;
1.1 deraadt 1477: }
1.14 markus 1478:
1.201 ! markus 1479: int
! 1480: ssh_packet_read_poll2(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
1.25 markus 1481: {
1.201 ! markus 1482: struct session_state *state = ssh->state;
1.40 markus 1483: u_int padlen, need;
1.201 ! markus 1484: u_char *cp, macbuf[SSH_DIGEST_MAX_LENGTH];
! 1485: u_int maclen, aadlen = 0, authlen = 0, block_size;
! 1486: struct sshenc *enc = NULL;
! 1487: struct sshmac *mac = NULL;
! 1488: struct sshcomp *comp = NULL;
1.200 markus 1489: int r;
1.201 ! markus 1490:
! 1491: *typep = SSH_MSG_NONE;
! 1492:
! 1493: if (state->packet_discard)
! 1494: return 0;
! 1495:
! 1496: if (state->newkeys[MODE_IN] != NULL) {
! 1497: enc = &state->newkeys[MODE_IN]->enc;
! 1498: mac = &state->newkeys[MODE_IN]->mac;
! 1499: comp = &state->newkeys[MODE_IN]->comp;
1.180 markus 1500: /* disable mac for authenticated encryption */
1501: if ((authlen = cipher_authlen(enc->cipher)) != 0)
1502: mac = NULL;
1.25 markus 1503: }
1504: maclen = mac && mac->enabled ? mac->mac_len : 0;
1.88 markus 1505: block_size = enc ? enc->block_size : 8;
1.180 markus 1506: aadlen = (mac && mac->enabled && mac->etm) || authlen ? 4 : 0;
1.25 markus 1507:
1.201 ! markus 1508: if (aadlen && state->packlen == 0) {
! 1509: if (cipher_get_length(&state->receive_context,
! 1510: &state->packlen, state->p_read.seqnr,
! 1511: sshbuf_ptr(state->input), sshbuf_len(state->input)) != 0)
! 1512: return 0;
! 1513: if (state->packlen < 1 + 4 ||
! 1514: state->packlen > PACKET_MAX_SIZE) {
1.178 markus 1515: #ifdef PACKET_DEBUG
1.201 ! markus 1516: sshbuf_dump(state->input, stderr);
1.178 markus 1517: #endif
1.201 ! markus 1518: logit("Bad packet length %u.", state->packlen);
! 1519: if ((r = sshpkt_disconnect(ssh, "Packet corrupt")) != 0)
! 1520: return r;
1.178 markus 1521: }
1.201 ! markus 1522: sshbuf_reset(state->incoming_packet);
! 1523: } else if (state->packlen == 0) {
1.25 markus 1524: /*
1525: * check if input size is less than the cipher block size,
1526: * decrypt first block and extract length of incoming packet
1527: */
1.201 ! markus 1528: if (sshbuf_len(state->input) < block_size)
! 1529: return 0;
! 1530: sshbuf_reset(state->incoming_packet);
! 1531: if ((r = sshbuf_reserve(state->incoming_packet, block_size,
! 1532: &cp)) != 0)
! 1533: goto out;
! 1534: if ((r = cipher_crypt(&state->receive_context,
! 1535: state->p_send.seqnr, cp, sshbuf_ptr(state->input),
! 1536: block_size, 0, 0)) != 0)
! 1537: goto out;
! 1538: state->packlen = PEEK_U32(sshbuf_ptr(state->incoming_packet));
! 1539: if (state->packlen < 1 + 4 ||
! 1540: state->packlen > PACKET_MAX_SIZE) {
1.110 markus 1541: #ifdef PACKET_DEBUG
1.201 ! markus 1542: fprintf(stderr, "input: \n");
! 1543: sshbuf_dump(state->input, stderr);
! 1544: fprintf(stderr, "incoming_packet: \n");
! 1545: sshbuf_dump(state->incoming_packet, stderr);
1.110 markus 1546: #endif
1.201 ! markus 1547: logit("Bad packet length %u.", state->packlen);
! 1548: return ssh_packet_start_discard(ssh, enc, mac,
! 1549: state->packlen, PACKET_MAX_SIZE);
1.25 markus 1550: }
1.201 ! markus 1551: if ((r = sshbuf_consume(state->input, block_size)) != 0)
! 1552: goto out;
1.25 markus 1553: }
1.201 ! markus 1554: DBG(debug("input: packet len %u", state->packlen+4));
! 1555:
1.178 markus 1556: if (aadlen) {
1557: /* only the payload is encrypted */
1.201 ! markus 1558: need = state->packlen;
1.178 markus 1559: } else {
1560: /*
1561: * the payload size and the payload are encrypted, but we
1562: * have a partial packet of block_size bytes
1563: */
1.201 ! markus 1564: need = 4 + state->packlen - block_size;
1.178 markus 1565: }
1.180 markus 1566: DBG(debug("partial packet: block %d, need %d, maclen %d, authlen %d,"
1567: " aadlen %d", block_size, need, maclen, authlen, aadlen));
1.158 markus 1568: if (need % block_size != 0) {
1569: logit("padding error: need %d block %d mod %d",
1.25 markus 1570: need, block_size, need % block_size);
1.201 ! markus 1571: return ssh_packet_start_discard(ssh, enc, mac,
! 1572: state->packlen, PACKET_MAX_SIZE - block_size);
1.158 markus 1573: }
1.25 markus 1574: /*
1575: * check if the entire packet has been received and
1.178 markus 1576: * decrypt into incoming_packet:
1577: * 'aadlen' bytes are unencrypted, but authenticated.
1.180 markus 1578: * 'need' bytes are encrypted, followed by either
1579: * 'authlen' bytes of authentication tag or
1.178 markus 1580: * 'maclen' bytes of message authentication code.
1.25 markus 1581: */
1.201 ! markus 1582: if (sshbuf_len(state->input) < aadlen + need + authlen + maclen)
! 1583: return 0;
1.25 markus 1584: #ifdef PACKET_DEBUG
1585: fprintf(stderr, "read_poll enc/full: ");
1.201 ! markus 1586: sshbuf_dump(state->input, stderr);
1.25 markus 1587: #endif
1.178 markus 1588: /* EtM: compute mac over encrypted input */
1.201 ! markus 1589: if (mac && mac->enabled && mac->etm) {
! 1590: if ((r = mac_compute(mac, state->p_read.seqnr,
! 1591: sshbuf_ptr(state->input), aadlen + need,
1.200 markus 1592: macbuf, sizeof(macbuf))) != 0)
1.201 ! markus 1593: goto out;
! 1594: }
! 1595: if ((r = sshbuf_reserve(state->incoming_packet, aadlen + need,
! 1596: &cp)) != 0)
! 1597: goto out;
! 1598: if ((r = cipher_crypt(&state->receive_context, state->p_read.seqnr, cp,
! 1599: sshbuf_ptr(state->input), need, aadlen, authlen)) != 0)
! 1600: goto out;
! 1601: if ((r = sshbuf_consume(state->input, aadlen + need + authlen)) != 0)
! 1602: goto out;
1.25 markus 1603: /*
1604: * compute MAC over seqnr and packet,
1605: * increment sequence number for incoming packet
1606: */
1.29 markus 1607: if (mac && mac->enabled) {
1.178 markus 1608: if (!mac->etm)
1.201 ! markus 1609: if ((r = mac_compute(mac, state->p_read.seqnr,
! 1610: sshbuf_ptr(state->incoming_packet),
! 1611: sshbuf_len(state->incoming_packet),
1.200 markus 1612: macbuf, sizeof(macbuf))) != 0)
1.201 ! markus 1613: goto out;
! 1614: if (timingsafe_bcmp(macbuf, sshbuf_ptr(state->input),
1.161 andreas 1615: mac->mac_len) != 0) {
1.159 markus 1616: logit("Corrupted MAC on input.");
1617: if (need > PACKET_MAX_SIZE)
1.201 ! markus 1618: return SSH_ERR_INTERNAL_ERROR;
! 1619: return ssh_packet_start_discard(ssh, enc, mac,
! 1620: state->packlen, PACKET_MAX_SIZE - need);
! 1621: }
! 1622:
! 1623: DBG(debug("MAC #%d ok", state->p_read.seqnr));
! 1624: if ((r = sshbuf_consume(state->input, mac->mac_len)) != 0)
! 1625: goto out;
1.25 markus 1626: }
1.159 markus 1627: /* XXX now it's safe to use fatal/packet_disconnect */
1.77 djm 1628: if (seqnr_p != NULL)
1.201 ! markus 1629: *seqnr_p = state->p_read.seqnr;
! 1630: if (++state->p_read.seqnr == 0)
1.106 itojun 1631: logit("incoming seqnr wraps around");
1.201 ! markus 1632: if (++state->p_read.packets == 0)
! 1633: if (!(ssh->compat & SSH_BUG_NOREKEY))
! 1634: return SSH_ERR_NEED_REKEY;
! 1635: state->p_read.blocks += (state->packlen + 4) / block_size;
! 1636: state->p_read.bytes += state->packlen + 4;
1.25 markus 1637:
1638: /* get padlen */
1.201 ! markus 1639: padlen = sshbuf_ptr(state->incoming_packet)[4];
1.25 markus 1640: DBG(debug("input: padlen %d", padlen));
1641: if (padlen < 4)
1.201 ! markus 1642: ssh_packet_disconnect(ssh,
! 1643: "Corrupted padlen %d on input.", padlen);
1.25 markus 1644:
1645: /* skip packet size + padlen, discard padding */
1.201 ! markus 1646: if ((r = sshbuf_consume(state->incoming_packet, 4 + 1)) != 0 ||
! 1647: ((r = sshbuf_consume_end(state->incoming_packet, padlen)) != 0))
! 1648: goto out;
1.25 markus 1649:
1.201 ! markus 1650: DBG(debug("input: len before de-compress %zd",
! 1651: sshbuf_len(state->incoming_packet)));
1.25 markus 1652: if (comp && comp->enabled) {
1.201 ! markus 1653: sshbuf_reset(state->compression_buffer);
! 1654: if ((r = uncompress_buffer(ssh, state->incoming_packet,
! 1655: state->compression_buffer)) != 0)
! 1656: goto out;
! 1657: sshbuf_reset(state->incoming_packet);
! 1658: if ((r = sshbuf_putb(state->incoming_packet,
! 1659: state->compression_buffer)) != 0)
! 1660: goto out;
! 1661: DBG(debug("input: len after de-compress %zd",
! 1662: sshbuf_len(state->incoming_packet)));
1.25 markus 1663: }
1664: /*
1665: * get packet type, implies consume.
1666: * return length of payload (without type field)
1667: */
1.201 ! markus 1668: if ((r = sshbuf_get_u8(state->incoming_packet, typep)) != 0)
! 1669: goto out;
! 1670: if (*typep < SSH2_MSG_MIN || *typep >= SSH2_MSG_LOCAL_MIN)
! 1671: ssh_packet_disconnect(ssh,
! 1672: "Invalid ssh2 packet type: %d", *typep);
! 1673: if (*typep == SSH2_MSG_NEWKEYS)
! 1674: r = ssh_set_newkeys(ssh, MODE_IN);
! 1675: else if (*typep == SSH2_MSG_USERAUTH_SUCCESS && !state->server_side)
! 1676: r = ssh_packet_enable_delayed_compress(ssh);
! 1677: else
! 1678: r = 0;
1.25 markus 1679: #ifdef PACKET_DEBUG
1.201 ! markus 1680: fprintf(stderr, "read/plain[%d]:\r\n", *typep);
! 1681: sshbuf_dump(state->incoming_packet, stderr);
1.25 markus 1682: #endif
1.62 markus 1683: /* reset for next packet */
1.201 ! markus 1684: state->packlen = 0;
! 1685: out:
! 1686: return r;
1.25 markus 1687: }
1688:
1689: int
1.201 ! markus 1690: ssh_packet_read_poll_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
1.25 markus 1691: {
1.201 ! markus 1692: struct session_state *state = ssh->state;
1.96 deraadt 1693: u_int reason, seqnr;
1.201 ! markus 1694: int r;
! 1695: u_char *msg;
1.62 markus 1696:
1.25 markus 1697: for (;;) {
1.201 ! markus 1698: msg = NULL;
1.62 markus 1699: if (compat20) {
1.201 ! markus 1700: r = ssh_packet_read_poll2(ssh, typep, seqnr_p);
! 1701: if (r != 0)
! 1702: return r;
! 1703: if (*typep) {
! 1704: state->keep_alive_timeouts = 0;
! 1705: DBG(debug("received packet type %d", *typep));
1.153 djm 1706: }
1.201 ! markus 1707: switch (*typep) {
1.150 dtucker 1708: case SSH2_MSG_IGNORE:
1.151 dtucker 1709: debug3("Received SSH2_MSG_IGNORE");
1.150 dtucker 1710: break;
1.25 markus 1711: case SSH2_MSG_DEBUG:
1.201 ! markus 1712: if ((r = sshpkt_get_u8(ssh, NULL)) != 0 ||
! 1713: (r = sshpkt_get_string(ssh, &msg, NULL)) != 0 ||
! 1714: (r = sshpkt_get_string(ssh, NULL, NULL)) != 0) {
! 1715: if (msg)
! 1716: free(msg);
! 1717: return r;
! 1718: }
1.25 markus 1719: debug("Remote: %.900s", msg);
1.186 djm 1720: free(msg);
1.25 markus 1721: break;
1722: case SSH2_MSG_DISCONNECT:
1.201 ! markus 1723: if ((r = sshpkt_get_u32(ssh, &reason)) != 0 ||
! 1724: (r = sshpkt_get_string(ssh, &msg, NULL)) != 0)
! 1725: return r;
1.182 djm 1726: /* Ignore normal client exit notifications */
1.201 ! markus 1727: do_log2(ssh->state->server_side &&
1.182 djm 1728: reason == SSH2_DISCONNECT_BY_APPLICATION ?
1729: SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_ERROR,
1730: "Received disconnect from %s: %u: %.400s",
1.201 ! markus 1731: ssh_remote_ipaddr(ssh), reason, msg);
1.186 djm 1732: free(msg);
1.201 ! markus 1733: return SSH_ERR_DISCONNECTED;
1.84 markus 1734: case SSH2_MSG_UNIMPLEMENTED:
1.201 ! markus 1735: if ((r = sshpkt_get_u32(ssh, &seqnr)) != 0)
! 1736: return r;
1.96 deraadt 1737: debug("Received SSH2_MSG_UNIMPLEMENTED for %u",
1738: seqnr);
1.150 dtucker 1739: break;
1.25 markus 1740: default:
1.201 ! markus 1741: return 0;
1.48 stevesk 1742: }
1.25 markus 1743: } else {
1.201 ! markus 1744: r = ssh_packet_read_poll1(ssh, typep);
! 1745: switch (*typep) {
1.188 djm 1746: case SSH_MSG_NONE:
1747: return SSH_MSG_NONE;
1.25 markus 1748: case SSH_MSG_IGNORE:
1749: break;
1750: case SSH_MSG_DEBUG:
1.201 ! markus 1751: if ((r = sshpkt_get_string(ssh, &msg, NULL)) != 0)
! 1752: return r;
1.25 markus 1753: debug("Remote: %.900s", msg);
1.186 djm 1754: free(msg);
1.25 markus 1755: break;
1756: case SSH_MSG_DISCONNECT:
1.201 ! markus 1757: if ((r = sshpkt_get_string(ssh, &msg, NULL)) != 0)
! 1758: return r;
1.181 djm 1759: error("Received disconnect from %s: %.400s",
1.201 ! markus 1760: ssh_remote_ipaddr(ssh), msg);
! 1761: free(msg);
! 1762: return SSH_ERR_DISCONNECTED;
1.25 markus 1763: default:
1.201 ! markus 1764: DBG(debug("received packet type %d", *typep));
! 1765: return 0;
1.48 stevesk 1766: }
1.25 markus 1767: }
1768: }
1769: }
1770:
1.16 markus 1771: /*
1772: * Buffers the given amount of input characters. This is intended to be used
1773: * together with packet_read_poll.
1774: */
1.1 deraadt 1775:
1.2 provos 1776: void
1.201 ! markus 1777: ssh_packet_process_incoming(struct ssh *ssh, const char *buf, u_int len)
1.1 deraadt 1778: {
1.201 ! markus 1779: struct session_state *state = ssh->state;
! 1780: int r;
! 1781:
! 1782: if (state->packet_discard) {
! 1783: state->keep_alive_timeouts = 0; /* ?? */
! 1784: if (len >= state->packet_discard) {
! 1785: if ((r = ssh_packet_stop_discard(ssh)) != 0)
! 1786: fatal("%s: %s", __func__, ssh_err(r));
! 1787: cleanup_exit(255);
! 1788: }
! 1789: state->packet_discard -= len;
1.159 markus 1790: return;
1791: }
1.201 ! markus 1792: if ((r = sshbuf_put(ssh->state->input, buf, len)) != 0)
! 1793: fatal("%s: %s", __func__, ssh_err(r));
1.28 markus 1794: }
1795:
1796: int
1.201 ! markus 1797: ssh_packet_remaining(struct ssh *ssh)
1.28 markus 1798: {
1.201 ! markus 1799: return sshbuf_len(ssh->state->incoming_packet);
1.1 deraadt 1800: }
1801:
1.16 markus 1802: /*
1803: * Sends a diagnostic message from the server to the client. This message
1804: * can be sent at any time (but not while constructing another message). The
1805: * message is printed immediately, but only if the client is being executed
1806: * in verbose mode. These messages are primarily intended to ease debugging
1807: * authentication problems. The length of the formatted message must not
1808: * exceed 1024 bytes. This will automatically call packet_write_wait.
1809: */
1.1 deraadt 1810:
1.2 provos 1811: void
1.201 ! markus 1812: ssh_packet_send_debug(struct ssh *ssh, const char *fmt,...)
1.1 deraadt 1813: {
1.14 markus 1814: char buf[1024];
1815: va_list args;
1.201 ! markus 1816: int r;
1.39 markus 1817:
1.201 ! markus 1818: if (compat20 && (ssh->compat & SSH_BUG_DEBUG))
1.39 markus 1819: return;
1.14 markus 1820:
1821: va_start(args, fmt);
1822: vsnprintf(buf, sizeof(buf), fmt, args);
1823: va_end(args);
1824:
1.30 markus 1825: if (compat20) {
1.201 ! markus 1826: if ((r = sshpkt_start(ssh, SSH2_MSG_DEBUG)) != 0 ||
! 1827: (r = sshpkt_put_u8(ssh, 0)) != 0 || /* always display */
! 1828: (r = sshpkt_put_cstring(ssh, buf)) != 0 ||
! 1829: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
! 1830: (r = sshpkt_send(ssh)) != 0)
! 1831: fatal("%s: %s", __func__, ssh_err(r));
1.30 markus 1832: } else {
1.201 ! markus 1833: if ((r = sshpkt_start(ssh, SSH_MSG_DEBUG)) != 0 ||
! 1834: (r = sshpkt_put_cstring(ssh, buf)) != 0 ||
! 1835: (r = sshpkt_send(ssh)) != 0)
! 1836: fatal("%s: %s", __func__, ssh_err(r));
1.30 markus 1837: }
1.201 ! markus 1838: ssh_packet_write_wait(ssh);
1.1 deraadt 1839: }
1840:
1.16 markus 1841: /*
1842: * Logs the error plus constructs and sends a disconnect packet, closes the
1843: * connection, and exits. This function never returns. The error message
1844: * should not contain a newline. The length of the formatted message must
1845: * not exceed 1024 bytes.
1846: */
1.1 deraadt 1847:
1.2 provos 1848: void
1.201 ! markus 1849: ssh_packet_disconnect(struct ssh *ssh, const char *fmt,...)
1.1 deraadt 1850: {
1.14 markus 1851: char buf[1024];
1852: va_list args;
1853: static int disconnecting = 0;
1.201 ! markus 1854: int r;
1.97 deraadt 1855:
1.14 markus 1856: if (disconnecting) /* Guard against recursive invocations. */
1857: fatal("packet_disconnect called recursively.");
1858: disconnecting = 1;
1859:
1.16 markus 1860: /*
1861: * Format the message. Note that the caller must make sure the
1862: * message is of limited size.
1863: */
1.14 markus 1864: va_start(args, fmt);
1865: vsnprintf(buf, sizeof(buf), fmt, args);
1866: va_end(args);
1867:
1.99 markus 1868: /* Display the error locally */
1.106 itojun 1869: logit("Disconnecting: %.100s", buf);
1.99 markus 1870:
1.14 markus 1871: /* Send the disconnect message to the other side, and wait for it to get sent. */
1.25 markus 1872: if (compat20) {
1.201 ! markus 1873: if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 ||
! 1874: (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_PROTOCOL_ERROR)) != 0 ||
! 1875: (r = sshpkt_put_cstring(ssh, buf)) != 0 ||
! 1876: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
! 1877: (r = sshpkt_send(ssh)) != 0)
! 1878: fatal("%s: %s", __func__, ssh_err(r));
1.25 markus 1879: } else {
1.201 ! markus 1880: if ((r = sshpkt_start(ssh, SSH_MSG_DISCONNECT)) != 0 ||
! 1881: (r = sshpkt_put_cstring(ssh, buf)) != 0 ||
! 1882: (r = sshpkt_send(ssh)) != 0)
! 1883: fatal("%s: %s", __func__, ssh_err(r));
1.25 markus 1884: }
1.201 ! markus 1885: ssh_packet_write_wait(ssh);
1.14 markus 1886:
1887: /* Close the connection. */
1.201 ! markus 1888: ssh_packet_close(ssh);
1.112 markus 1889: cleanup_exit(255);
1.1 deraadt 1890: }
1891:
1.16 markus 1892: /* Checks if there is any buffered output, and tries to write some of the output. */
1.1 deraadt 1893:
1.2 provos 1894: void
1.201 ! markus 1895: ssh_packet_write_poll(struct ssh *ssh)
1.1 deraadt 1896: {
1.201 ! markus 1897: struct session_state *state = ssh->state;
! 1898: int len = sshbuf_len(state->output);
! 1899: int cont, r;
1.97 deraadt 1900:
1.14 markus 1901: if (len > 0) {
1.163 andreas 1902: cont = 0;
1.201 ! markus 1903: len = roaming_write(state->connection_out,
! 1904: sshbuf_ptr(state->output), len, &cont);
1.156 djm 1905: if (len == -1) {
1906: if (errno == EINTR || errno == EAGAIN)
1.14 markus 1907: return;
1.156 djm 1908: fatal("Write failed: %.100s", strerror(errno));
1.14 markus 1909: }
1.163 andreas 1910: if (len == 0 && !cont)
1.156 djm 1911: fatal("Write connection closed");
1.201 ! markus 1912: if ((r = sshbuf_consume(state->output, len)) != 0)
! 1913: fatal("%s: %s", __func__, ssh_err(r));
1.14 markus 1914: }
1.1 deraadt 1915: }
1916:
1.16 markus 1917: /*
1918: * Calls packet_write_poll repeatedly until all pending output data has been
1919: * written.
1920: */
1.1 deraadt 1921:
1.2 provos 1922: void
1.201 ! markus 1923: ssh_packet_write_wait(struct ssh *ssh)
1.1 deraadt 1924: {
1.56 millert 1925: fd_set *setp;
1.188 djm 1926: int ret, ms_remain = 0;
1.154 dtucker 1927: struct timeval start, timeout, *timeoutp = NULL;
1.201 ! markus 1928: struct session_state *state = ssh->state;
1.56 millert 1929:
1.201 ! markus 1930: setp = (fd_set *)calloc(howmany(state->connection_out + 1,
1.161 andreas 1931: NFDBITS), sizeof(fd_mask));
1.201 ! markus 1932: if (setp == NULL)
! 1933: fatal("%s: calloc failed", __func__);
! 1934: ssh_packet_write_poll(ssh);
! 1935: while (ssh_packet_have_data_to_write(ssh)) {
! 1936: memset(setp, 0, howmany(state->connection_out + 1,
1.161 andreas 1937: NFDBITS) * sizeof(fd_mask));
1.201 ! markus 1938: FD_SET(state->connection_out, setp);
1.154 dtucker 1939:
1.201 ! markus 1940: if (state->packet_timeout_ms > 0) {
! 1941: ms_remain = state->packet_timeout_ms;
1.154 dtucker 1942: timeoutp = &timeout;
1943: }
1944: for (;;) {
1.201 ! markus 1945: if (state->packet_timeout_ms != -1) {
1.154 dtucker 1946: ms_to_timeval(&timeout, ms_remain);
1947: gettimeofday(&start, NULL);
1948: }
1.201 ! markus 1949: if ((ret = select(state->connection_out + 1,
1.161 andreas 1950: NULL, setp, NULL, timeoutp)) >= 0)
1.154 dtucker 1951: break;
1.161 andreas 1952: if (errno != EAGAIN && errno != EINTR)
1.154 dtucker 1953: break;
1.201 ! markus 1954: if (state->packet_timeout_ms == -1)
1.154 dtucker 1955: continue;
1956: ms_subtract_diff(&start, &ms_remain);
1957: if (ms_remain <= 0) {
1958: ret = 0;
1959: break;
1960: }
1961: }
1962: if (ret == 0) {
1963: logit("Connection to %.200s timed out while "
1.201 ! markus 1964: "waiting to write", ssh_remote_ipaddr(ssh));
1.154 dtucker 1965: cleanup_exit(255);
1966: }
1.201 ! markus 1967: ssh_packet_write_poll(ssh);
1.14 markus 1968: }
1.186 djm 1969: free(setp);
1.1 deraadt 1970: }
1971:
1972: /* Returns true if there is buffered data to write to the connection. */
1973:
1.2 provos 1974: int
1.201 ! markus 1975: ssh_packet_have_data_to_write(struct ssh *ssh)
1.1 deraadt 1976: {
1.201 ! markus 1977: return sshbuf_len(ssh->state->output) != 0;
1.1 deraadt 1978: }
1979:
1980: /* Returns true if there is not too much data to write to the connection. */
1981:
1.2 provos 1982: int
1.201 ! markus 1983: ssh_packet_not_very_much_data_to_write(struct ssh *ssh)
1.1 deraadt 1984: {
1.201 ! markus 1985: if (ssh->state->interactive_mode)
! 1986: return sshbuf_len(ssh->state->output) < 16384;
1.14 markus 1987: else
1.201 ! markus 1988: return sshbuf_len(ssh->state->output) < 128 * 1024;
1.1 deraadt 1989: }
1990:
1.201 ! markus 1991: void
! 1992: ssh_packet_set_tos(struct ssh *ssh, int tos)
1.101 markus 1993: {
1.201 ! markus 1994: if (!ssh_packet_connection_is_on_socket(ssh))
1.101 markus 1995: return;
1.201 ! markus 1996: switch (ssh_packet_connection_af(ssh)) {
1.173 djm 1997: case AF_INET:
1998: debug3("%s: set IP_TOS 0x%02x", __func__, tos);
1.201 ! markus 1999: if (setsockopt(ssh->state->connection_in,
1.173 djm 2000: IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0)
2001: error("setsockopt IP_TOS %d: %.100s:",
2002: tos, strerror(errno));
2003: break;
2004: case AF_INET6:
2005: debug3("%s: set IPV6_TCLASS 0x%02x", __func__, tos);
1.201 ! markus 2006: if (setsockopt(ssh->state->connection_in,
1.173 djm 2007: IPPROTO_IPV6, IPV6_TCLASS, &tos, sizeof(tos)) < 0)
2008: error("setsockopt IPV6_TCLASS %d: %.100s:",
2009: tos, strerror(errno));
2010: break;
2011: }
1.101 markus 2012: }
2013:
1.1 deraadt 2014: /* Informs that the current session is interactive. Sets IP flags for that. */
2015:
1.2 provos 2016: void
1.201 ! markus 2017: ssh_packet_set_interactive(struct ssh *ssh, int interactive, int qos_interactive, int qos_bulk)
1.1 deraadt 2018: {
1.201 ! markus 2019: struct session_state *state = ssh->state;
! 2020:
! 2021: if (state->set_interactive_called)
1.43 markus 2022: return;
1.201 ! markus 2023: state->set_interactive_called = 1;
1.1 deraadt 2024:
1.14 markus 2025: /* Record that we are in interactive mode. */
1.201 ! markus 2026: state->interactive_mode = interactive;
1.1 deraadt 2027:
1.19 markus 2028: /* Only set socket options if using a socket. */
1.201 ! markus 2029: if (!ssh_packet_connection_is_on_socket(ssh))
1.14 markus 2030: return;
1.201 ! markus 2031: set_nodelay(state->connection_in);
! 2032: ssh_packet_set_tos(ssh, interactive ? qos_interactive :
! 2033: qos_bulk);
1.1 deraadt 2034: }
2035:
2036: /* Returns true if the current connection is interactive. */
2037:
1.2 provos 2038: int
1.201 ! markus 2039: ssh_packet_is_interactive(struct ssh *ssh)
1.1 deraadt 2040: {
1.201 ! markus 2041: return ssh->state->interactive_mode;
1.12 markus 2042: }
2043:
1.113 deraadt 2044: int
1.201 ! markus 2045: ssh_packet_set_maxsize(struct ssh *ssh, u_int s)
1.12 markus 2046: {
1.201 ! markus 2047: struct session_state *state = ssh->state;
! 2048:
! 2049: if (state->set_maxsize_called) {
1.106 itojun 2050: logit("packet_set_maxsize: called twice: old %d new %d",
1.201 ! markus 2051: state->max_packet_size, s);
1.14 markus 2052: return -1;
2053: }
2054: if (s < 4 * 1024 || s > 1024 * 1024) {
1.106 itojun 2055: logit("packet_set_maxsize: bad size %d", s);
1.14 markus 2056: return -1;
2057: }
1.201 ! markus 2058: state->set_maxsize_called = 1;
1.66 markus 2059: debug("packet_set_maxsize: setting to %d", s);
1.201 ! markus 2060: state->max_packet_size = s;
1.14 markus 2061: return s;
1.53 markus 2062: }
2063:
1.161 andreas 2064: int
1.201 ! markus 2065: ssh_packet_inc_alive_timeouts(struct ssh *ssh)
1.161 andreas 2066: {
1.201 ! markus 2067: return ++ssh->state->keep_alive_timeouts;
1.161 andreas 2068: }
2069:
2070: void
1.201 ! markus 2071: ssh_packet_set_alive_timeouts(struct ssh *ssh, int ka)
1.161 andreas 2072: {
1.201 ! markus 2073: ssh->state->keep_alive_timeouts = ka;
1.161 andreas 2074: }
2075:
2076: u_int
1.201 ! markus 2077: ssh_packet_get_maxsize(struct ssh *ssh)
1.71 markus 2078: {
1.201 ! markus 2079: return ssh->state->max_packet_size;
1.71 markus 2080: }
2081:
1.53 markus 2082: /*
2083: * 9.2. Ignored Data Message
1.61 markus 2084: *
1.53 markus 2085: * byte SSH_MSG_IGNORE
2086: * string data
1.61 markus 2087: *
1.53 markus 2088: * All implementations MUST understand (and ignore) this message at any
2089: * time (after receiving the protocol version). No implementation is
2090: * required to send them. This message can be used as an additional
2091: * protection measure against advanced traffic analysis techniques.
2092: */
1.54 markus 2093: void
1.201 ! markus 2094: ssh_packet_send_ignore(struct ssh *ssh, int nbytes)
1.54 markus 2095: {
1.115 avsm 2096: u_int32_t rnd = 0;
1.201 ! markus 2097: int r, i;
1.54 markus 2098:
1.201 ! markus 2099: if ((r = sshpkt_start(ssh, compat20 ?
! 2100: SSH2_MSG_IGNORE : SSH_MSG_IGNORE)) != 0 ||
! 2101: (r = sshpkt_put_u32(ssh, nbytes)) != 0)
! 2102: fatal("%s: %s", __func__, ssh_err(r));
1.75 deraadt 2103: for (i = 0; i < nbytes; i++) {
1.53 markus 2104: if (i % 4 == 0)
1.115 avsm 2105: rnd = arc4random();
1.201 ! markus 2106: if ((r = sshpkt_put_u8(ssh, (u_char)rnd & 0xff)) != 0)
! 2107: fatal("%s: %s", __func__, ssh_err(r));
1.115 avsm 2108: rnd >>= 8;
1.53 markus 2109: }
1.105 markus 2110: }
2111:
1.113 deraadt 2112: #define MAX_PACKETS (1U<<31)
1.105 markus 2113: int
1.201 ! markus 2114: ssh_packet_need_rekeying(struct ssh *ssh)
1.105 markus 2115: {
1.201 ! markus 2116: struct session_state *state = ssh->state;
! 2117:
! 2118: if (ssh->compat & SSH_BUG_NOREKEY)
1.105 markus 2119: return 0;
2120: return
1.201 ! markus 2121: (state->p_send.packets > MAX_PACKETS) ||
! 2122: (state->p_read.packets > MAX_PACKETS) ||
! 2123: (state->max_blocks_out &&
! 2124: (state->p_send.blocks > state->max_blocks_out)) ||
! 2125: (state->max_blocks_in &&
! 2126: (state->p_read.blocks > state->max_blocks_in)) ||
! 2127: (state->rekey_interval != 0 && state->rekey_time +
! 2128: state->rekey_interval <= monotime());
1.105 markus 2129: }
2130:
2131: void
1.201 ! markus 2132: ssh_packet_set_rekey_limits(struct ssh *ssh, u_int32_t bytes, time_t seconds)
1.105 markus 2133: {
1.184 dtucker 2134: debug3("rekey after %lld bytes, %d seconds", (long long)bytes,
2135: (int)seconds);
1.201 ! markus 2136: ssh->state->rekey_limit = bytes;
! 2137: ssh->state->rekey_interval = seconds;
1.184 dtucker 2138: /*
2139: * We set the time here so that in post-auth privsep slave we count
2140: * from the completion of the authentication.
2141: */
1.201 ! markus 2142: ssh->state->rekey_time = monotime();
1.184 dtucker 2143: }
2144:
2145: time_t
1.201 ! markus 2146: ssh_packet_get_rekey_timeout(struct ssh *ssh)
1.184 dtucker 2147: {
2148: time_t seconds;
2149:
1.201 ! markus 2150: seconds = ssh->state->rekey_time + ssh->state->rekey_interval -
1.187 dtucker 2151: monotime();
1.185 dtucker 2152: return (seconds <= 0 ? 1 : seconds);
1.118 markus 2153: }
2154:
2155: void
1.201 ! markus 2156: ssh_packet_set_server(struct ssh *ssh)
1.118 markus 2157: {
1.201 ! markus 2158: ssh->state->server_side = 1;
1.118 markus 2159: }
2160:
2161: void
1.201 ! markus 2162: ssh_packet_set_authenticated(struct ssh *ssh)
1.118 markus 2163: {
1.201 ! markus 2164: ssh->state->after_authentication = 1;
1.161 andreas 2165: }
2166:
2167: void *
1.201 ! markus 2168: ssh_packet_get_input(struct ssh *ssh)
1.161 andreas 2169: {
1.201 ! markus 2170: return (void *)ssh->state->input;
1.161 andreas 2171: }
2172:
2173: void *
1.201 ! markus 2174: ssh_packet_get_output(struct ssh *ssh)
1.161 andreas 2175: {
1.201 ! markus 2176: return (void *)ssh->state->output;
1.166 andreas 2177: }
2178:
1.201 ! markus 2179: /* XXX TODO update roaming to new API (does not work anyway) */
1.166 andreas 2180: /*
2181: * Save the state for the real connection, and use a separate state when
2182: * resuming a suspended connection.
2183: */
2184: void
1.201 ! markus 2185: ssh_packet_backup_state(struct ssh *ssh,
! 2186: struct ssh *backup_state)
1.166 andreas 2187: {
1.201 ! markus 2188: struct ssh *tmp;
1.166 andreas 2189:
1.201 ! markus 2190: close(ssh->state->connection_in);
! 2191: ssh->state->connection_in = -1;
! 2192: close(ssh->state->connection_out);
! 2193: ssh->state->connection_out = -1;
1.166 andreas 2194: if (backup_state)
2195: tmp = backup_state;
2196: else
1.201 ! markus 2197: tmp = ssh_alloc_session_state();
! 2198: backup_state = ssh;
! 2199: ssh = tmp;
1.166 andreas 2200: }
2201:
1.201 ! markus 2202: /* XXX FIXME FIXME FIXME */
1.166 andreas 2203: /*
2204: * Swap in the old state when resuming a connecion.
2205: */
2206: void
1.201 ! markus 2207: ssh_packet_restore_state(struct ssh *ssh,
! 2208: struct ssh *backup_state)
1.166 andreas 2209: {
1.201 ! markus 2210: struct ssh *tmp;
1.166 andreas 2211: u_int len;
1.201 ! markus 2212: int r;
1.166 andreas 2213:
2214: tmp = backup_state;
1.201 ! markus 2215: backup_state = ssh;
! 2216: ssh = tmp;
! 2217: ssh->state->connection_in = backup_state->state->connection_in;
! 2218: backup_state->state->connection_in = -1;
! 2219: ssh->state->connection_out = backup_state->state->connection_out;
! 2220: backup_state->state->connection_out = -1;
! 2221: len = sshbuf_len(backup_state->state->input);
1.166 andreas 2222: if (len > 0) {
1.201 ! markus 2223: if ((r = sshbuf_putb(ssh->state->input,
! 2224: backup_state->state->input)) != 0)
! 2225: fatal("%s: %s", __func__, ssh_err(r));
! 2226: sshbuf_reset(backup_state->state->input);
1.166 andreas 2227: add_recv_bytes(len);
1.196 markus 2228: }
2229: }
2230:
2231: /* Reset after_authentication and reset compression in post-auth privsep */
1.201 ! markus 2232: static int
! 2233: ssh_packet_set_postauth(struct ssh *ssh)
1.196 markus 2234: {
1.201 ! markus 2235: struct sshcomp *comp;
! 2236: int r, mode;
1.196 markus 2237:
2238: debug("%s: called", __func__);
2239: /* This was set in net child, but is not visible in user child */
1.201 ! markus 2240: ssh->state->after_authentication = 1;
! 2241: ssh->state->rekeying = 0;
1.196 markus 2242: for (mode = 0; mode < MODE_MAX; mode++) {
1.201 ! markus 2243: if (ssh->state->newkeys[mode] == NULL)
1.196 markus 2244: continue;
1.201 ! markus 2245: comp = &ssh->state->newkeys[mode]->comp;
! 2246: if (comp && comp->enabled &&
! 2247: (r = ssh_packet_init_compression(ssh)) != 0)
! 2248: return r;
! 2249: }
! 2250: return 0;
! 2251: }
! 2252:
! 2253: /* Packet state (de-)serialization for privsep */
! 2254:
! 2255: /* turn kex into a blob for packet state serialization */
! 2256: static int
! 2257: kex_to_blob(struct sshbuf *m, struct kex *kex)
! 2258: {
! 2259: int r;
! 2260:
! 2261: if ((r = sshbuf_put_string(m, kex->session_id,
! 2262: kex->session_id_len)) != 0 ||
! 2263: (r = sshbuf_put_u32(m, kex->we_need)) != 0 ||
! 2264: (r = sshbuf_put_u32(m, kex->hostkey_type)) != 0 ||
! 2265: (r = sshbuf_put_u32(m, kex->kex_type)) != 0 ||
! 2266: (r = sshbuf_put_stringb(m, kex->my)) != 0 ||
! 2267: (r = sshbuf_put_stringb(m, kex->peer)) != 0 ||
! 2268: (r = sshbuf_put_u32(m, kex->flags)) != 0 ||
! 2269: (r = sshbuf_put_cstring(m, kex->client_version_string)) != 0 ||
! 2270: (r = sshbuf_put_cstring(m, kex->server_version_string)) != 0)
! 2271: return r;
! 2272: return 0;
! 2273: }
! 2274:
! 2275: /* turn key exchange results into a blob for packet state serialization */
! 2276: static int
! 2277: newkeys_to_blob(struct sshbuf *m, struct ssh *ssh, int mode)
! 2278: {
! 2279: struct sshbuf *b;
! 2280: struct sshcipher_ctx *cc;
! 2281: struct sshcomp *comp;
! 2282: struct sshenc *enc;
! 2283: struct sshmac *mac;
! 2284: struct newkeys *newkey;
! 2285: int r;
! 2286:
! 2287: if ((newkey = ssh->state->newkeys[mode]) == NULL)
! 2288: return SSH_ERR_INTERNAL_ERROR;
! 2289: enc = &newkey->enc;
! 2290: mac = &newkey->mac;
! 2291: comp = &newkey->comp;
! 2292: cc = (mode == MODE_OUT) ? &ssh->state->send_context :
! 2293: &ssh->state->receive_context;
! 2294: if ((r = cipher_get_keyiv(cc, enc->iv, enc->iv_len)) != 0)
! 2295: return r;
! 2296: if ((b = sshbuf_new()) == NULL)
! 2297: return SSH_ERR_ALLOC_FAIL;
! 2298: /* The cipher struct is constant and shared, you export pointer */
! 2299: if ((r = sshbuf_put_cstring(b, enc->name)) != 0 ||
! 2300: (r = sshbuf_put(b, &enc->cipher, sizeof(enc->cipher))) != 0 ||
! 2301: (r = sshbuf_put_u32(b, enc->enabled)) != 0 ||
! 2302: (r = sshbuf_put_u32(b, enc->block_size)) != 0 ||
! 2303: (r = sshbuf_put_string(b, enc->key, enc->key_len)) != 0 ||
! 2304: (r = sshbuf_put_string(b, enc->iv, enc->iv_len)) != 0)
! 2305: goto out;
! 2306: if (cipher_authlen(enc->cipher) == 0) {
! 2307: if ((r = sshbuf_put_cstring(b, mac->name)) != 0 ||
! 2308: (r = sshbuf_put_u32(b, mac->enabled)) != 0 ||
! 2309: (r = sshbuf_put_string(b, mac->key, mac->key_len)) != 0)
! 2310: goto out;
! 2311: }
! 2312: if ((r = sshbuf_put_u32(b, comp->type)) != 0 ||
! 2313: (r = sshbuf_put_u32(b, comp->enabled)) != 0 ||
! 2314: (r = sshbuf_put_cstring(b, comp->name)) != 0)
! 2315: goto out;
! 2316: r = sshbuf_put_stringb(m, b);
! 2317: out:
! 2318: if (b != NULL)
! 2319: sshbuf_free(b);
! 2320: return r;
! 2321: }
! 2322:
! 2323: /* serialize packet state into a blob */
! 2324: int
! 2325: ssh_packet_get_state(struct ssh *ssh, struct sshbuf *m)
! 2326: {
! 2327: struct session_state *state = ssh->state;
! 2328: u_char *p;
! 2329: size_t slen, rlen;
! 2330: int r, ssh1cipher;
! 2331:
! 2332: if (!compat20) {
! 2333: ssh1cipher = cipher_get_number(state->receive_context.cipher);
! 2334: slen = cipher_get_keyiv_len(&state->send_context);
! 2335: rlen = cipher_get_keyiv_len(&state->receive_context);
! 2336: if ((r = sshbuf_put_u32(m, state->remote_protocol_flags)) != 0 ||
! 2337: (r = sshbuf_put_u32(m, ssh1cipher)) != 0 ||
! 2338: (r = sshbuf_put_string(m, state->ssh1_key, state->ssh1_keylen)) != 0 ||
! 2339: (r = sshbuf_put_u32(m, slen)) != 0 ||
! 2340: (r = sshbuf_reserve(m, slen, &p)) != 0 ||
! 2341: (r = cipher_get_keyiv(&state->send_context, p, slen)) != 0 ||
! 2342: (r = sshbuf_put_u32(m, rlen)) != 0 ||
! 2343: (r = sshbuf_reserve(m, rlen, &p)) != 0 ||
! 2344: (r = cipher_get_keyiv(&state->receive_context, p, rlen)) != 0)
! 2345: return r;
! 2346: } else {
! 2347: if ((r = kex_to_blob(m, ssh->kex)) != 0 ||
! 2348: (r = newkeys_to_blob(m, ssh, MODE_OUT)) != 0 ||
! 2349: (r = newkeys_to_blob(m, ssh, MODE_IN)) != 0 ||
! 2350: (r = sshbuf_put_u32(m, state->p_send.seqnr)) != 0 ||
! 2351: (r = sshbuf_put_u64(m, state->p_send.blocks)) != 0 ||
! 2352: (r = sshbuf_put_u32(m, state->p_send.packets)) != 0 ||
! 2353: (r = sshbuf_put_u64(m, state->p_send.bytes)) != 0 ||
! 2354: (r = sshbuf_put_u32(m, state->p_read.seqnr)) != 0 ||
! 2355: (r = sshbuf_put_u64(m, state->p_read.blocks)) != 0 ||
! 2356: (r = sshbuf_put_u32(m, state->p_read.packets)) != 0 ||
! 2357: (r = sshbuf_put_u64(m, state->p_read.bytes)) != 0)
! 2358: return r;
! 2359: }
! 2360:
! 2361: slen = cipher_get_keycontext(&state->send_context, NULL);
! 2362: rlen = cipher_get_keycontext(&state->receive_context, NULL);
! 2363: if ((r = sshbuf_put_u32(m, slen)) != 0 ||
! 2364: (r = sshbuf_reserve(m, slen, &p)) != 0)
! 2365: return r;
! 2366: if (cipher_get_keycontext(&state->send_context, p) != (int)slen)
! 2367: return SSH_ERR_INTERNAL_ERROR;
! 2368: if ((r = sshbuf_put_u32(m, rlen)) != 0 ||
! 2369: (r = sshbuf_reserve(m, rlen, &p)) != 0)
! 2370: return r;
! 2371: if (cipher_get_keycontext(&state->receive_context, p) != (int)rlen)
! 2372: return SSH_ERR_INTERNAL_ERROR;
! 2373:
! 2374: if ((r = ssh_packet_get_compress_state(m, ssh)) != 0 ||
! 2375: (r = sshbuf_put_stringb(m, state->input)) != 0 ||
! 2376: (r = sshbuf_put_stringb(m, state->output)) != 0)
! 2377: return r;
! 2378:
! 2379: if (compat20) {
! 2380: if ((r = sshbuf_put_u64(m, get_sent_bytes())) != 0 ||
! 2381: (r = sshbuf_put_u64(m, get_recv_bytes())) != 0)
! 2382: return r;
! 2383: }
! 2384: return 0;
! 2385: }
! 2386:
! 2387: /* restore key exchange results from blob for packet state de-serialization */
! 2388: static int
! 2389: newkeys_from_blob(struct sshbuf *m, struct ssh *ssh, int mode)
! 2390: {
! 2391: struct sshbuf *b = NULL;
! 2392: struct sshcomp *comp;
! 2393: struct sshenc *enc;
! 2394: struct sshmac *mac;
! 2395: struct newkeys *newkey = NULL;
! 2396: size_t keylen, ivlen, maclen;
! 2397: int r;
! 2398:
! 2399: if ((newkey = calloc(1, sizeof(*newkey))) == NULL) {
! 2400: r = SSH_ERR_ALLOC_FAIL;
! 2401: goto out;
! 2402: }
! 2403: if ((r = sshbuf_froms(m, &b)) != 0)
! 2404: goto out;
! 2405: #ifdef DEBUG_PK
! 2406: sshbuf_dump(b, stderr);
! 2407: #endif
! 2408: enc = &newkey->enc;
! 2409: mac = &newkey->mac;
! 2410: comp = &newkey->comp;
! 2411:
! 2412: if ((r = sshbuf_get_cstring(b, &enc->name, NULL)) != 0 ||
! 2413: (r = sshbuf_get(b, &enc->cipher, sizeof(enc->cipher))) != 0 ||
! 2414: (r = sshbuf_get_u32(b, (u_int *)&enc->enabled)) != 0 ||
! 2415: (r = sshbuf_get_u32(b, &enc->block_size)) != 0 ||
! 2416: (r = sshbuf_get_string(b, &enc->key, &keylen)) != 0 ||
! 2417: (r = sshbuf_get_string(b, &enc->iv, &ivlen)) != 0)
! 2418: goto out;
! 2419: if (cipher_authlen(enc->cipher) == 0) {
! 2420: if ((r = sshbuf_get_cstring(b, &mac->name, NULL)) != 0)
! 2421: goto out;
! 2422: if ((r = mac_setup(mac, mac->name)) != 0)
! 2423: goto out;
! 2424: if ((r = sshbuf_get_u32(b, (u_int *)&mac->enabled)) != 0 ||
! 2425: (r = sshbuf_get_string(b, &mac->key, &maclen)) != 0)
! 2426: goto out;
! 2427: if (maclen > mac->key_len) {
! 2428: r = SSH_ERR_INVALID_FORMAT;
! 2429: goto out;
! 2430: }
! 2431: mac->key_len = maclen;
! 2432: }
! 2433: if ((r = sshbuf_get_u32(b, &comp->type)) != 0 ||
! 2434: (r = sshbuf_get_u32(b, (u_int *)&comp->enabled)) != 0 ||
! 2435: (r = sshbuf_get_cstring(b, &comp->name, NULL)) != 0)
! 2436: goto out;
! 2437: if (enc->name == NULL ||
! 2438: cipher_by_name(enc->name) != enc->cipher) {
! 2439: r = SSH_ERR_INVALID_FORMAT;
! 2440: goto out;
! 2441: }
! 2442: if (sshbuf_len(b) != 0) {
! 2443: r = SSH_ERR_INVALID_FORMAT;
! 2444: goto out;
! 2445: }
! 2446: enc->key_len = keylen;
! 2447: enc->iv_len = ivlen;
! 2448: ssh->kex->newkeys[mode] = newkey;
! 2449: newkey = NULL;
! 2450: r = 0;
! 2451: out:
! 2452: if (newkey != NULL)
! 2453: free(newkey);
! 2454: if (b != NULL)
! 2455: sshbuf_free(b);
! 2456: return r;
! 2457: }
! 2458:
! 2459: /* restore kex from blob for packet state de-serialization */
! 2460: static int
! 2461: kex_from_blob(struct sshbuf *m, struct kex **kexp)
! 2462: {
! 2463: struct kex *kex;
! 2464: int r;
! 2465:
! 2466: if ((kex = calloc(1, sizeof(struct kex))) == NULL ||
! 2467: (kex->my = sshbuf_new()) == NULL ||
! 2468: (kex->peer = sshbuf_new()) == NULL) {
! 2469: r = SSH_ERR_ALLOC_FAIL;
! 2470: goto out;
! 2471: }
! 2472: if ((r = sshbuf_get_string(m, &kex->session_id, &kex->session_id_len)) != 0 ||
! 2473: (r = sshbuf_get_u32(m, &kex->we_need)) != 0 ||
! 2474: (r = sshbuf_get_u32(m, (u_int *)&kex->hostkey_type)) != 0 ||
! 2475: (r = sshbuf_get_u32(m, &kex->kex_type)) != 0 ||
! 2476: (r = sshbuf_get_stringb(m, kex->my)) != 0 ||
! 2477: (r = sshbuf_get_stringb(m, kex->peer)) != 0 ||
! 2478: (r = sshbuf_get_u32(m, &kex->flags)) != 0 ||
! 2479: (r = sshbuf_get_cstring(m, &kex->client_version_string, NULL)) != 0 ||
! 2480: (r = sshbuf_get_cstring(m, &kex->server_version_string, NULL)) != 0)
! 2481: goto out;
! 2482: kex->server = 1;
! 2483: kex->done = 1;
! 2484: r = 0;
! 2485: out:
! 2486: if (r != 0 || kexp == NULL) {
! 2487: if (kex != NULL) {
! 2488: if (kex->my != NULL)
! 2489: sshbuf_free(kex->my);
! 2490: if (kex->peer != NULL)
! 2491: sshbuf_free(kex->peer);
! 2492: free(kex);
! 2493: }
! 2494: if (kexp != NULL)
! 2495: *kexp = NULL;
! 2496: } else {
! 2497: *kexp = kex;
! 2498: }
! 2499: return r;
! 2500: }
! 2501:
! 2502: /*
! 2503: * Restore packet state from content of blob 'm' (de-serialization).
! 2504: * Note that 'm' will be partially consumed on parsing or any other errors.
! 2505: */
! 2506: int
! 2507: ssh_packet_set_state(struct ssh *ssh, struct sshbuf *m)
! 2508: {
! 2509: struct session_state *state = ssh->state;
! 2510: const u_char *ssh1key, *ivin, *ivout, *keyin, *keyout, *input, *output;
! 2511: size_t ssh1keylen, rlen, slen, ilen, olen;
! 2512: int r;
! 2513: u_int ssh1cipher = 0;
! 2514: u_int64_t sent_bytes = 0, recv_bytes = 0;
! 2515:
! 2516: if (!compat20) {
! 2517: if ((r = sshbuf_get_u32(m, &state->remote_protocol_flags)) != 0 ||
! 2518: (r = sshbuf_get_u32(m, &ssh1cipher)) != 0 ||
! 2519: (r = sshbuf_get_string_direct(m, &ssh1key, &ssh1keylen)) != 0 ||
! 2520: (r = sshbuf_get_string_direct(m, &ivout, &slen)) != 0 ||
! 2521: (r = sshbuf_get_string_direct(m, &ivin, &rlen)) != 0)
! 2522: return r;
! 2523: if (ssh1cipher > INT_MAX)
! 2524: return SSH_ERR_KEY_UNKNOWN_CIPHER;
! 2525: ssh_packet_set_encryption_key(ssh, ssh1key, ssh1keylen,
! 2526: (int)ssh1cipher);
! 2527: if (cipher_get_keyiv_len(&state->send_context) != (int)slen ||
! 2528: cipher_get_keyiv_len(&state->receive_context) != (int)rlen)
! 2529: return SSH_ERR_INVALID_FORMAT;
! 2530: if ((r = cipher_set_keyiv(&state->send_context, ivout)) != 0 ||
! 2531: (r = cipher_set_keyiv(&state->receive_context, ivin)) != 0)
! 2532: return r;
! 2533: } else {
! 2534: if ((r = kex_from_blob(m, &ssh->kex)) != 0 ||
! 2535: (r = newkeys_from_blob(m, ssh, MODE_OUT)) != 0 ||
! 2536: (r = newkeys_from_blob(m, ssh, MODE_IN)) != 0 ||
! 2537: (r = sshbuf_get_u32(m, &state->p_send.seqnr)) != 0 ||
! 2538: (r = sshbuf_get_u64(m, &state->p_send.blocks)) != 0 ||
! 2539: (r = sshbuf_get_u32(m, &state->p_send.packets)) != 0 ||
! 2540: (r = sshbuf_get_u64(m, &state->p_send.bytes)) != 0 ||
! 2541: (r = sshbuf_get_u32(m, &state->p_read.seqnr)) != 0 ||
! 2542: (r = sshbuf_get_u64(m, &state->p_read.blocks)) != 0 ||
! 2543: (r = sshbuf_get_u32(m, &state->p_read.packets)) != 0 ||
! 2544: (r = sshbuf_get_u64(m, &state->p_read.bytes)) != 0)
! 2545: return r;
! 2546: /* XXX ssh_set_newkeys overrides p_read.packets? XXX */
! 2547: if ((r = ssh_set_newkeys(ssh, MODE_IN)) != 0 ||
! 2548: (r = ssh_set_newkeys(ssh, MODE_OUT)) != 0)
! 2549: return r;
! 2550: }
! 2551: if ((r = sshbuf_get_string_direct(m, &keyout, &slen)) != 0 ||
! 2552: (r = sshbuf_get_string_direct(m, &keyin, &rlen)) != 0)
! 2553: return r;
! 2554: if (cipher_get_keycontext(&state->send_context, NULL) != (int)slen ||
! 2555: cipher_get_keycontext(&state->receive_context, NULL) != (int)rlen)
! 2556: return SSH_ERR_INVALID_FORMAT;
! 2557: cipher_set_keycontext(&state->send_context, keyout);
! 2558: cipher_set_keycontext(&state->receive_context, keyin);
! 2559:
! 2560: if ((r = ssh_packet_set_compress_state(ssh, m)) != 0 ||
! 2561: (r = ssh_packet_set_postauth(ssh)) != 0)
! 2562: return r;
! 2563:
! 2564: sshbuf_reset(state->input);
! 2565: sshbuf_reset(state->output);
! 2566: if ((r = sshbuf_get_string_direct(m, &input, &ilen)) != 0 ||
! 2567: (r = sshbuf_get_string_direct(m, &output, &olen)) != 0 ||
! 2568: (r = sshbuf_put(state->input, input, ilen)) != 0 ||
! 2569: (r = sshbuf_put(state->output, output, olen)) != 0)
! 2570: return r;
! 2571:
! 2572: if (compat20) {
! 2573: if ((r = sshbuf_get_u64(m, &sent_bytes)) != 0 ||
! 2574: (r = sshbuf_get_u64(m, &recv_bytes)) != 0)
! 2575: return r;
! 2576: roam_set_bytes(sent_bytes, recv_bytes);
! 2577: }
! 2578: if (sshbuf_len(m))
! 2579: return SSH_ERR_INVALID_FORMAT;
! 2580: debug3("%s: done", __func__);
! 2581: return 0;
! 2582: }
! 2583:
! 2584: /* NEW API */
! 2585:
! 2586: /* put data to the outgoing packet */
! 2587:
! 2588: int
! 2589: sshpkt_put(struct ssh *ssh, const void *v, size_t len)
! 2590: {
! 2591: return sshbuf_put(ssh->state->outgoing_packet, v, len);
! 2592: }
! 2593:
! 2594: int
! 2595: sshpkt_putb(struct ssh *ssh, const struct sshbuf *b)
! 2596: {
! 2597: return sshbuf_putb(ssh->state->outgoing_packet, b);
! 2598: }
! 2599:
! 2600: int
! 2601: sshpkt_put_u8(struct ssh *ssh, u_char val)
! 2602: {
! 2603: return sshbuf_put_u8(ssh->state->outgoing_packet, val);
! 2604: }
! 2605:
! 2606: int
! 2607: sshpkt_put_u32(struct ssh *ssh, u_int32_t val)
! 2608: {
! 2609: return sshbuf_put_u32(ssh->state->outgoing_packet, val);
! 2610: }
! 2611:
! 2612: int
! 2613: sshpkt_put_u64(struct ssh *ssh, u_int64_t val)
! 2614: {
! 2615: return sshbuf_put_u64(ssh->state->outgoing_packet, val);
! 2616: }
! 2617:
! 2618: int
! 2619: sshpkt_put_string(struct ssh *ssh, const void *v, size_t len)
! 2620: {
! 2621: return sshbuf_put_string(ssh->state->outgoing_packet, v, len);
! 2622: }
! 2623:
! 2624: int
! 2625: sshpkt_put_cstring(struct ssh *ssh, const void *v)
! 2626: {
! 2627: return sshbuf_put_cstring(ssh->state->outgoing_packet, v);
! 2628: }
! 2629:
! 2630: int
! 2631: sshpkt_put_stringb(struct ssh *ssh, const struct sshbuf *v)
! 2632: {
! 2633: return sshbuf_put_stringb(ssh->state->outgoing_packet, v);
! 2634: }
! 2635:
! 2636: int
! 2637: sshpkt_put_ec(struct ssh *ssh, const EC_POINT *v, const EC_GROUP *g)
! 2638: {
! 2639: return sshbuf_put_ec(ssh->state->outgoing_packet, v, g);
! 2640: }
! 2641:
! 2642: int
! 2643: sshpkt_put_bignum1(struct ssh *ssh, const BIGNUM *v)
! 2644: {
! 2645: return sshbuf_put_bignum1(ssh->state->outgoing_packet, v);
! 2646: }
! 2647:
! 2648: int
! 2649: sshpkt_put_bignum2(struct ssh *ssh, const BIGNUM *v)
! 2650: {
! 2651: return sshbuf_put_bignum2(ssh->state->outgoing_packet, v);
! 2652: }
! 2653:
! 2654: /* fetch data from the incoming packet */
! 2655:
! 2656: int
! 2657: sshpkt_get(struct ssh *ssh, void *valp, size_t len)
! 2658: {
! 2659: return sshbuf_get(ssh->state->incoming_packet, valp, len);
! 2660: }
! 2661:
! 2662: int
! 2663: sshpkt_get_u8(struct ssh *ssh, u_char *valp)
! 2664: {
! 2665: return sshbuf_get_u8(ssh->state->incoming_packet, valp);
! 2666: }
! 2667:
! 2668: int
! 2669: sshpkt_get_u32(struct ssh *ssh, u_int32_t *valp)
! 2670: {
! 2671: return sshbuf_get_u32(ssh->state->incoming_packet, valp);
! 2672: }
! 2673:
! 2674: int
! 2675: sshpkt_get_u64(struct ssh *ssh, u_int64_t *valp)
! 2676: {
! 2677: return sshbuf_get_u64(ssh->state->incoming_packet, valp);
! 2678: }
! 2679:
! 2680: int
! 2681: sshpkt_get_string(struct ssh *ssh, u_char **valp, size_t *lenp)
! 2682: {
! 2683: return sshbuf_get_string(ssh->state->incoming_packet, valp, lenp);
! 2684: }
! 2685:
! 2686: int
! 2687: sshpkt_get_string_direct(struct ssh *ssh, const u_char **valp, size_t *lenp)
! 2688: {
! 2689: return sshbuf_get_string_direct(ssh->state->incoming_packet, valp, lenp);
! 2690: }
! 2691:
! 2692: int
! 2693: sshpkt_get_cstring(struct ssh *ssh, char **valp, size_t *lenp)
! 2694: {
! 2695: return sshbuf_get_cstring(ssh->state->incoming_packet, valp, lenp);
! 2696: }
! 2697:
! 2698: int
! 2699: sshpkt_get_ec(struct ssh *ssh, EC_POINT *v, const EC_GROUP *g)
! 2700: {
! 2701: return sshbuf_get_ec(ssh->state->incoming_packet, v, g);
! 2702: }
! 2703:
! 2704: int
! 2705: sshpkt_get_bignum1(struct ssh *ssh, BIGNUM *v)
! 2706: {
! 2707: return sshbuf_get_bignum1(ssh->state->incoming_packet, v);
! 2708: }
! 2709:
! 2710: int
! 2711: sshpkt_get_bignum2(struct ssh *ssh, BIGNUM *v)
! 2712: {
! 2713: return sshbuf_get_bignum2(ssh->state->incoming_packet, v);
! 2714: }
! 2715:
! 2716: int
! 2717: sshpkt_get_end(struct ssh *ssh)
! 2718: {
! 2719: if (sshbuf_len(ssh->state->incoming_packet) > 0)
! 2720: return SSH_ERR_UNEXPECTED_TRAILING_DATA;
! 2721: return 0;
! 2722: }
! 2723:
! 2724: const u_char *
! 2725: sshpkt_ptr(struct ssh *ssh, size_t *lenp)
! 2726: {
! 2727: if (lenp != NULL)
! 2728: *lenp = sshbuf_len(ssh->state->incoming_packet);
! 2729: return sshbuf_ptr(ssh->state->incoming_packet);
! 2730: }
! 2731:
! 2732: /* start a new packet */
! 2733:
! 2734: int
! 2735: sshpkt_start(struct ssh *ssh, u_char type)
! 2736: {
! 2737: u_char buf[9];
! 2738: int len;
! 2739:
! 2740: DBG(debug("packet_start[%d]", type));
! 2741: len = compat20 ? 6 : 9;
! 2742: memset(buf, 0, len - 1);
! 2743: buf[len - 1] = type;
! 2744: sshbuf_reset(ssh->state->outgoing_packet);
! 2745: return sshbuf_put(ssh->state->outgoing_packet, buf, len);
! 2746: }
! 2747:
! 2748: /* send it */
! 2749:
! 2750: int
! 2751: sshpkt_send(struct ssh *ssh)
! 2752: {
! 2753: if (compat20)
! 2754: return ssh_packet_send2(ssh);
! 2755: else
! 2756: return ssh_packet_send1(ssh);
! 2757: }
! 2758:
! 2759: int
! 2760: sshpkt_disconnect(struct ssh *ssh, const char *fmt,...)
! 2761: {
! 2762: char buf[1024];
! 2763: va_list args;
! 2764: int r;
! 2765:
! 2766: va_start(args, fmt);
! 2767: vsnprintf(buf, sizeof(buf), fmt, args);
! 2768: va_end(args);
! 2769:
! 2770: if (compat20) {
! 2771: if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 ||
! 2772: (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_PROTOCOL_ERROR)) != 0 ||
! 2773: (r = sshpkt_put_cstring(ssh, buf)) != 0 ||
! 2774: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
! 2775: (r = sshpkt_send(ssh)) != 0)
! 2776: return r;
! 2777: } else {
! 2778: if ((r = sshpkt_start(ssh, SSH_MSG_DISCONNECT)) != 0 ||
! 2779: (r = sshpkt_put_cstring(ssh, buf)) != 0 ||
! 2780: (r = sshpkt_send(ssh)) != 0)
! 2781: return r;
1.166 andreas 2782: }
1.201 ! markus 2783: return 0;
! 2784: }
! 2785:
! 2786: /* roundup current message to pad bytes */
! 2787: int
! 2788: sshpkt_add_padding(struct ssh *ssh, u_char pad)
! 2789: {
! 2790: ssh->state->extra_pad = pad;
! 2791: return 0;
1.1 deraadt 2792: }
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