markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1 | /* $OpenBSD: packet.c,v 1.201 2015/01/19 19:52:16 markus Exp $ */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 5 | * All rights reserved |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 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. |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 8 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 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". |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 14 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 15 | * |
| 16 | * SSH2 packet format added by Markus Friedl. |
Ben Lindstrom | 4469723 | 2001-07-04 03:32:30 +0000 | [diff] [blame] | 17 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 18 | * |
| 19 | * Redistribution and use in source and binary forms, with or without |
| 20 | * modification, are permitted provided that the following conditions |
| 21 | * are met: |
| 22 | * 1. Redistributions of source code must retain the above copyright |
| 23 | * notice, this list of conditions and the following disclaimer. |
| 24 | * 2. Redistributions in binary form must reproduce the above copyright |
| 25 | * notice, this list of conditions and the following disclaimer in the |
| 26 | * documentation and/or other materials provided with the distribution. |
| 27 | * |
| 28 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 29 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 30 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 31 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 32 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 33 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 34 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 35 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 36 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 37 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 38 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 39 | |
| 40 | #include "includes.h" |
Damien Miller | 68f8e99 | 2006-03-15 11:24:12 +1100 | [diff] [blame] | 41 | |
Damien Miller | e3b60b5 | 2006-07-10 21:08:03 +1000 | [diff] [blame] | 42 | #include <sys/types.h> |
Damien Miller | a0898b8 | 2003-04-09 21:05:52 +1000 | [diff] [blame] | 43 | #include "openbsd-compat/sys-queue.h" |
Damien Miller | 8dbffe7 | 2006-08-05 11:02:17 +1000 | [diff] [blame] | 44 | #include <sys/param.h> |
Damien Miller | 8ec8c3e | 2006-07-10 20:35:38 +1000 | [diff] [blame] | 45 | #include <sys/socket.h> |
Damien Miller | 9aec919 | 2006-08-05 10:57:45 +1000 | [diff] [blame] | 46 | #ifdef HAVE_SYS_TIME_H |
| 47 | # include <sys/time.h> |
| 48 | #endif |
Damien Miller | 8ec8c3e | 2006-07-10 20:35:38 +1000 | [diff] [blame] | 49 | |
Damien Miller | 8ec8c3e | 2006-07-10 20:35:38 +1000 | [diff] [blame] | 50 | #include <netinet/in.h> |
Damien Miller | 68f8e99 | 2006-03-15 11:24:12 +1100 | [diff] [blame] | 51 | #include <netinet/ip.h> |
Darren Tucker | dace233 | 2006-09-22 19:22:17 +1000 | [diff] [blame] | 52 | #include <arpa/inet.h> |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 53 | |
Darren Tucker | 3997249 | 2006-07-12 22:22:46 +1000 | [diff] [blame] | 54 | #include <errno.h> |
Darren Tucker | 5d19626 | 2006-07-12 22:15:16 +1000 | [diff] [blame] | 55 | #include <stdarg.h> |
Damien Miller | a7a73ee | 2006-08-05 11:37:59 +1000 | [diff] [blame] | 56 | #include <stdio.h> |
Damien Miller | e7a1e5c | 2006-08-05 11:34:19 +1000 | [diff] [blame] | 57 | #include <stdlib.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 58 | #include <string.h> |
Damien Miller | e6b3b61 | 2006-07-24 14:01:23 +1000 | [diff] [blame] | 59 | #include <unistd.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 60 | #include <signal.h> |
Darren Tucker | c53c2af | 2013-05-16 20:28:16 +1000 | [diff] [blame] | 61 | #include <time.h> |
Darren Tucker | 5d19626 | 2006-07-12 22:15:16 +1000 | [diff] [blame] | 62 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 63 | #include <zlib.h> |
| 64 | |
| 65 | #include "buffer.h" /* typedefs XXX */ |
| 66 | #include "key.h" /* typedefs XXX */ |
| 67 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 68 | #include "xmalloc.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 69 | #include "crc32.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 70 | #include "deattack.h" |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 71 | #include "compat.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 72 | #include "ssh1.h" |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 73 | #include "ssh2.h" |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 74 | #include "cipher.h" |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 75 | #include "sshkey.h" |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 76 | #include "kex.h" |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 77 | #include "digest.h" |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 78 | #include "mac.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 79 | #include "log.h" |
| 80 | #include "canohost.h" |
Damien Miller | 4d00776 | 2002-02-05 11:52:54 +1100 | [diff] [blame] | 81 | #include "misc.h" |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 82 | #include "channels.h" |
Ben Lindstrom | 402c6cc | 2002-06-21 00:43:42 +0000 | [diff] [blame] | 83 | #include "ssh.h" |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 84 | #include "packet.h" |
Darren Tucker | c5564e1 | 2009-06-21 18:53:53 +1000 | [diff] [blame] | 85 | #include "roaming.h" |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 86 | #include "ssherr.h" |
| 87 | #include "sshbuf.h" |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 88 | |
| 89 | #ifdef PACKET_DEBUG |
| 90 | #define DBG(x) x |
| 91 | #else |
| 92 | #define DBG(x) |
| 93 | #endif |
| 94 | |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 95 | #define PACKET_MAX_SIZE (256 * 1024) |
| 96 | |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 97 | struct packet_state { |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 98 | u_int32_t seqnr; |
| 99 | u_int32_t packets; |
| 100 | u_int64_t blocks; |
Damien Miller | b61f3fc | 2008-07-11 17:36:48 +1000 | [diff] [blame] | 101 | u_int64_t bytes; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 102 | }; |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 103 | |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 104 | struct packet { |
| 105 | TAILQ_ENTRY(packet) next; |
| 106 | u_char type; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 107 | struct sshbuf *payload; |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 108 | }; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 109 | |
| 110 | struct session_state { |
| 111 | /* |
| 112 | * This variable contains the file descriptors used for |
| 113 | * communicating with the other side. connection_in is used for |
| 114 | * reading; connection_out for writing. These can be the same |
| 115 | * descriptor, in which case it is assumed to be a socket. |
| 116 | */ |
| 117 | int connection_in; |
| 118 | int connection_out; |
| 119 | |
| 120 | /* Protocol flags for the remote side. */ |
| 121 | u_int remote_protocol_flags; |
| 122 | |
| 123 | /* Encryption context for receiving data. Only used for decryption. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 124 | struct sshcipher_ctx receive_context; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 125 | |
| 126 | /* Encryption context for sending data. Only used for encryption. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 127 | struct sshcipher_ctx send_context; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 128 | |
| 129 | /* Buffer for raw input data from the socket. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 130 | struct sshbuf *input; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 131 | |
| 132 | /* Buffer for raw output data going to the socket. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 133 | struct sshbuf *output; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 134 | |
| 135 | /* Buffer for the partial outgoing packet being constructed. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 136 | struct sshbuf *outgoing_packet; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 137 | |
| 138 | /* Buffer for the incoming packet currently being processed. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 139 | struct sshbuf *incoming_packet; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 140 | |
| 141 | /* Scratch buffer for packet compression/decompression. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 142 | struct sshbuf *compression_buffer; |
| 143 | |
| 144 | /* Incoming/outgoing compression dictionaries */ |
| 145 | z_stream compression_in_stream; |
| 146 | z_stream compression_out_stream; |
| 147 | int compression_in_started; |
| 148 | int compression_out_started; |
| 149 | int compression_in_failures; |
| 150 | int compression_out_failures; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 151 | |
| 152 | /* |
| 153 | * Flag indicating whether packet compression/decompression is |
| 154 | * enabled. |
| 155 | */ |
| 156 | int packet_compression; |
| 157 | |
| 158 | /* default maximum packet size */ |
| 159 | u_int max_packet_size; |
| 160 | |
| 161 | /* Flag indicating whether this module has been initialized. */ |
| 162 | int initialized; |
| 163 | |
| 164 | /* Set to true if the connection is interactive. */ |
| 165 | int interactive_mode; |
| 166 | |
| 167 | /* Set to true if we are the server side. */ |
| 168 | int server_side; |
| 169 | |
| 170 | /* Set to true if we are authenticated. */ |
| 171 | int after_authentication; |
| 172 | |
| 173 | int keep_alive_timeouts; |
| 174 | |
| 175 | /* The maximum time that we will wait to send or receive a packet */ |
| 176 | int packet_timeout_ms; |
| 177 | |
| 178 | /* Session key information for Encryption and MAC */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 179 | struct newkeys *newkeys[MODE_MAX]; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 180 | struct packet_state p_read, p_send; |
| 181 | |
Darren Tucker | c53c2af | 2013-05-16 20:28:16 +1000 | [diff] [blame] | 182 | /* Volume-based rekeying */ |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 183 | u_int64_t max_blocks_in, max_blocks_out; |
| 184 | u_int32_t rekey_limit; |
| 185 | |
Darren Tucker | c53c2af | 2013-05-16 20:28:16 +1000 | [diff] [blame] | 186 | /* Time-based rekeying */ |
| 187 | time_t rekey_interval; /* how often in seconds */ |
| 188 | time_t rekey_time; /* time of last rekeying */ |
| 189 | |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 190 | /* Session key for protocol v1 */ |
| 191 | u_char ssh1_key[SSH_SESSION_KEY_LENGTH]; |
| 192 | u_int ssh1_keylen; |
| 193 | |
| 194 | /* roundup current message to extra_pad bytes */ |
| 195 | u_char extra_pad; |
| 196 | |
| 197 | /* XXX discard incoming data after MAC error */ |
| 198 | u_int packet_discard; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 199 | struct sshmac *packet_discard_mac; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 200 | |
| 201 | /* Used in packet_read_poll2() */ |
| 202 | u_int packlen; |
| 203 | |
Darren Tucker | 7b935c7 | 2009-06-21 18:59:36 +1000 | [diff] [blame] | 204 | /* Used in packet_send2 */ |
| 205 | int rekeying; |
| 206 | |
| 207 | /* Used in packet_set_interactive */ |
| 208 | int set_interactive_called; |
| 209 | |
| 210 | /* Used in packet_set_maxsize */ |
| 211 | int set_maxsize_called; |
| 212 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 213 | /* One-off warning about weak ciphers */ |
| 214 | int cipher_warning_done; |
| 215 | |
| 216 | /* SSH1 CRC compensation attack detector */ |
| 217 | struct deattack_ctx deattack; |
| 218 | |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 219 | TAILQ_HEAD(, packet) outgoing; |
| 220 | }; |
| 221 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 222 | struct ssh * |
| 223 | ssh_alloc_session_state(void) |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 224 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 225 | struct ssh *ssh = NULL; |
| 226 | struct session_state *state = NULL; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 227 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 228 | if ((ssh = calloc(1, sizeof(*ssh))) == NULL || |
| 229 | (state = calloc(1, sizeof(*state))) == NULL || |
| 230 | (state->input = sshbuf_new()) == NULL || |
| 231 | (state->output = sshbuf_new()) == NULL || |
| 232 | (state->outgoing_packet = sshbuf_new()) == NULL || |
| 233 | (state->incoming_packet = sshbuf_new()) == NULL) |
| 234 | goto fail; |
| 235 | TAILQ_INIT(&state->outgoing); |
| 236 | state->connection_in = -1; |
| 237 | state->connection_out = -1; |
| 238 | state->max_packet_size = 32768; |
| 239 | state->packet_timeout_ms = -1; |
| 240 | state->p_send.packets = state->p_read.packets = 0; |
| 241 | state->initialized = 1; |
| 242 | /* |
| 243 | * ssh_packet_send2() needs to queue packets until |
| 244 | * we've done the initial key exchange. |
| 245 | */ |
| 246 | state->rekeying = 1; |
| 247 | ssh->state = state; |
| 248 | return ssh; |
| 249 | fail: |
| 250 | if (state) { |
| 251 | sshbuf_free(state->input); |
| 252 | sshbuf_free(state->output); |
| 253 | sshbuf_free(state->incoming_packet); |
| 254 | sshbuf_free(state->outgoing_packet); |
| 255 | free(state); |
| 256 | } |
| 257 | free(ssh); |
| 258 | return NULL; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 259 | } |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 260 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 261 | /* |
| 262 | * Sets the descriptors used for communication. Disables encryption until |
| 263 | * packet_set_encryption_key is called. |
| 264 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 265 | struct ssh * |
| 266 | ssh_packet_set_connection(struct ssh *ssh, int fd_in, int fd_out) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 267 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 268 | struct session_state *state; |
| 269 | const struct sshcipher *none = cipher_by_name("none"); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 270 | int r; |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 271 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 272 | if (none == NULL) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 273 | fatal("%s: cannot load cipher 'none'", __func__); |
| 274 | if (ssh == NULL) |
| 275 | ssh = ssh_alloc_session_state(); |
| 276 | if (ssh == NULL) |
| 277 | fatal("%s: cound not allocate state", __func__); |
| 278 | state = ssh->state; |
| 279 | state->connection_in = fd_in; |
| 280 | state->connection_out = fd_out; |
| 281 | if ((r = cipher_init(&state->send_context, none, |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 282 | (const u_char *)"", 0, NULL, 0, CIPHER_ENCRYPT)) != 0 || |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 283 | (r = cipher_init(&state->receive_context, none, |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 284 | (const u_char *)"", 0, NULL, 0, CIPHER_DECRYPT)) != 0) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 285 | fatal("%s: cipher_init failed: %s", __func__, ssh_err(r)); |
| 286 | state->newkeys[MODE_IN] = state->newkeys[MODE_OUT] = NULL; |
| 287 | deattack_init(&state->deattack); |
| 288 | return ssh; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 289 | } |
| 290 | |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 291 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 292 | ssh_packet_set_timeout(struct ssh *ssh, int timeout, int count) |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 293 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 294 | struct session_state *state = ssh->state; |
| 295 | |
Damien Miller | 8ed4de8 | 2011-12-19 10:52:50 +1100 | [diff] [blame] | 296 | if (timeout <= 0 || count <= 0) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 297 | state->packet_timeout_ms = -1; |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 298 | return; |
| 299 | } |
| 300 | if ((INT_MAX / 1000) / count < timeout) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 301 | state->packet_timeout_ms = INT_MAX; |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 302 | else |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 303 | state->packet_timeout_ms = timeout * count * 1000; |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 304 | } |
| 305 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 306 | int |
| 307 | ssh_packet_stop_discard(struct ssh *ssh) |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 308 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 309 | struct session_state *state = ssh->state; |
| 310 | int r; |
| 311 | |
| 312 | if (state->packet_discard_mac) { |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 313 | char buf[1024]; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 314 | |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 315 | memset(buf, 'a', sizeof(buf)); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 316 | while (sshbuf_len(state->incoming_packet) < |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 317 | PACKET_MAX_SIZE) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 318 | if ((r = sshbuf_put(state->incoming_packet, buf, |
| 319 | sizeof(buf))) != 0) |
| 320 | return r; |
| 321 | (void) mac_compute(state->packet_discard_mac, |
| 322 | state->p_read.seqnr, |
| 323 | sshbuf_ptr(state->incoming_packet), PACKET_MAX_SIZE, |
| 324 | NULL, 0); |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 325 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 326 | logit("Finished discarding for %.200s", ssh_remote_ipaddr(ssh)); |
| 327 | return SSH_ERR_MAC_INVALID; |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 328 | } |
| 329 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 330 | static int |
| 331 | ssh_packet_start_discard(struct ssh *ssh, struct sshenc *enc, |
| 332 | struct sshmac *mac, u_int packet_length, u_int discard) |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 333 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 334 | struct session_state *state = ssh->state; |
| 335 | int r; |
| 336 | |
| 337 | if (enc == NULL || !cipher_is_cbc(enc->cipher) || (mac && mac->etm)) { |
| 338 | if ((r = sshpkt_disconnect(ssh, "Packet corrupt")) != 0) |
| 339 | return r; |
| 340 | return SSH_ERR_MAC_INVALID; |
| 341 | } |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 342 | if (packet_length != PACKET_MAX_SIZE && mac && mac->enabled) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 343 | state->packet_discard_mac = mac; |
| 344 | if (sshbuf_len(state->input) >= discard && |
| 345 | (r = ssh_packet_stop_discard(ssh)) != 0) |
| 346 | return r; |
| 347 | state->packet_discard = discard - sshbuf_len(state->input); |
| 348 | return 0; |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 349 | } |
| 350 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 351 | /* Returns 1 if remote host is connected via socket, 0 if not. */ |
| 352 | |
| 353 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 354 | ssh_packet_connection_is_on_socket(struct ssh *ssh) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 355 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 356 | struct session_state *state = ssh->state; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 357 | struct sockaddr_storage from, to; |
| 358 | socklen_t fromlen, tolen; |
| 359 | |
| 360 | /* filedescriptors in and out are the same, so it's a socket */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 361 | if (state->connection_in == state->connection_out) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 362 | return 1; |
| 363 | fromlen = sizeof(from); |
| 364 | memset(&from, 0, sizeof(from)); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 365 | if (getpeername(state->connection_in, (struct sockaddr *)&from, |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 366 | &fromlen) < 0) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 367 | return 0; |
| 368 | tolen = sizeof(to); |
| 369 | memset(&to, 0, sizeof(to)); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 370 | if (getpeername(state->connection_out, (struct sockaddr *)&to, |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 371 | &tolen) < 0) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 372 | return 0; |
| 373 | if (fromlen != tolen || memcmp(&from, &to, fromlen) != 0) |
| 374 | return 0; |
| 375 | if (from.ss_family != AF_INET && from.ss_family != AF_INET6) |
| 376 | return 0; |
| 377 | return 1; |
| 378 | } |
| 379 | |
Ben Lindstrom | f6027d3 | 2002-03-22 01:42:04 +0000 | [diff] [blame] | 380 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 381 | ssh_packet_get_bytes(struct ssh *ssh, u_int64_t *ibytes, u_int64_t *obytes) |
Ben Lindstrom | f6027d3 | 2002-03-22 01:42:04 +0000 | [diff] [blame] | 382 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 383 | if (ibytes) |
| 384 | *ibytes = ssh->state->p_read.bytes; |
| 385 | if (obytes) |
| 386 | *obytes = ssh->state->p_send.bytes; |
Ben Lindstrom | f6027d3 | 2002-03-22 01:42:04 +0000 | [diff] [blame] | 387 | } |
| 388 | |
| 389 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 390 | ssh_packet_connection_af(struct ssh *ssh) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 391 | { |
| 392 | struct sockaddr_storage to; |
Damien Miller | 6fe375d | 2000-01-23 09:38:00 +1100 | [diff] [blame] | 393 | socklen_t tolen = sizeof(to); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 394 | |
| 395 | memset(&to, 0, sizeof(to)); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 396 | if (getsockname(ssh->state->connection_out, (struct sockaddr *)&to, |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 397 | &tolen) < 0) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 398 | return 0; |
Damien Miller | aa100c5 | 2002-04-26 16:54:34 +1000 | [diff] [blame] | 399 | #ifdef IPV4_IN_IPV6 |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 400 | if (to.ss_family == AF_INET6 && |
Damien Miller | aa100c5 | 2002-04-26 16:54:34 +1000 | [diff] [blame] | 401 | IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&to)->sin6_addr)) |
Damien Miller | d2ac5d7 | 2011-05-15 08:43:13 +1000 | [diff] [blame] | 402 | return AF_INET; |
Damien Miller | aa100c5 | 2002-04-26 16:54:34 +1000 | [diff] [blame] | 403 | #endif |
Damien Miller | d2ac5d7 | 2011-05-15 08:43:13 +1000 | [diff] [blame] | 404 | return to.ss_family; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 405 | } |
| 406 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 407 | /* Sets the connection into non-blocking mode. */ |
| 408 | |
| 409 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 410 | ssh_packet_set_nonblocking(struct ssh *ssh) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 411 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 412 | /* Set the socket into non-blocking mode. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 413 | set_nonblock(ssh->state->connection_in); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 414 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 415 | if (ssh->state->connection_out != ssh->state->connection_in) |
| 416 | set_nonblock(ssh->state->connection_out); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 417 | } |
| 418 | |
| 419 | /* Returns the socket used for reading. */ |
| 420 | |
| 421 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 422 | ssh_packet_get_connection_in(struct ssh *ssh) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 423 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 424 | return ssh->state->connection_in; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 425 | } |
| 426 | |
| 427 | /* Returns the descriptor used for writing. */ |
| 428 | |
| 429 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 430 | ssh_packet_get_connection_out(struct ssh *ssh) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 431 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 432 | return ssh->state->connection_out; |
| 433 | } |
| 434 | |
| 435 | /* |
| 436 | * Returns the IP-address of the remote host as a string. The returned |
| 437 | * string must not be freed. |
| 438 | */ |
| 439 | |
| 440 | const char * |
| 441 | ssh_remote_ipaddr(struct ssh *ssh) |
| 442 | { |
| 443 | /* Check whether we have cached the ipaddr. */ |
| 444 | if (ssh->remote_ipaddr == NULL) |
| 445 | ssh->remote_ipaddr = ssh_packet_connection_is_on_socket(ssh) ? |
| 446 | get_peer_ipaddr(ssh->state->connection_in) : |
| 447 | strdup("UNKNOWN"); |
| 448 | if (ssh->remote_ipaddr == NULL) |
| 449 | return "UNKNOWN"; |
| 450 | return ssh->remote_ipaddr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 451 | } |
| 452 | |
| 453 | /* Closes the connection and clears and frees internal data structures. */ |
| 454 | |
| 455 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 456 | ssh_packet_close(struct ssh *ssh) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 457 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 458 | struct session_state *state = ssh->state; |
| 459 | int r; |
| 460 | u_int mode; |
| 461 | |
| 462 | if (!state->initialized) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 463 | return; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 464 | state->initialized = 0; |
| 465 | if (state->connection_in == state->connection_out) { |
| 466 | shutdown(state->connection_out, SHUT_RDWR); |
| 467 | close(state->connection_out); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 468 | } else { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 469 | close(state->connection_in); |
| 470 | close(state->connection_out); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 471 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 472 | sshbuf_free(state->input); |
| 473 | sshbuf_free(state->output); |
| 474 | sshbuf_free(state->outgoing_packet); |
| 475 | sshbuf_free(state->incoming_packet); |
| 476 | for (mode = 0; mode < MODE_MAX; mode++) |
| 477 | kex_free_newkeys(state->newkeys[mode]); |
| 478 | if (state->compression_buffer) { |
| 479 | sshbuf_free(state->compression_buffer); |
| 480 | if (state->compression_out_started) { |
| 481 | z_streamp stream = &state->compression_out_stream; |
| 482 | debug("compress outgoing: " |
| 483 | "raw data %llu, compressed %llu, factor %.2f", |
| 484 | (unsigned long long)stream->total_in, |
| 485 | (unsigned long long)stream->total_out, |
| 486 | stream->total_in == 0 ? 0.0 : |
| 487 | (double) stream->total_out / stream->total_in); |
| 488 | if (state->compression_out_failures == 0) |
| 489 | deflateEnd(stream); |
| 490 | } |
| 491 | if (state->compression_in_started) { |
| 492 | z_streamp stream = &state->compression_out_stream; |
| 493 | debug("compress incoming: " |
| 494 | "raw data %llu, compressed %llu, factor %.2f", |
| 495 | (unsigned long long)stream->total_out, |
| 496 | (unsigned long long)stream->total_in, |
| 497 | stream->total_out == 0 ? 0.0 : |
| 498 | (double) stream->total_in / stream->total_out); |
| 499 | if (state->compression_in_failures == 0) |
| 500 | inflateEnd(stream); |
| 501 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 502 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 503 | if ((r = cipher_cleanup(&state->send_context)) != 0) |
| 504 | error("%s: cipher_cleanup failed: %s", __func__, ssh_err(r)); |
| 505 | if ((r = cipher_cleanup(&state->receive_context)) != 0) |
| 506 | error("%s: cipher_cleanup failed: %s", __func__, ssh_err(r)); |
| 507 | if (ssh->remote_ipaddr) { |
| 508 | free(ssh->remote_ipaddr); |
| 509 | ssh->remote_ipaddr = NULL; |
| 510 | } |
| 511 | free(ssh->state); |
| 512 | ssh->state = NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 513 | } |
| 514 | |
| 515 | /* Sets remote side protocol flags. */ |
| 516 | |
| 517 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 518 | ssh_packet_set_protocol_flags(struct ssh *ssh, u_int protocol_flags) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 519 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 520 | ssh->state->remote_protocol_flags = protocol_flags; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 521 | } |
| 522 | |
| 523 | /* Returns the remote protocol flags set earlier by the above function. */ |
| 524 | |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 525 | u_int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 526 | ssh_packet_get_protocol_flags(struct ssh *ssh) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 527 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 528 | return ssh->state->remote_protocol_flags; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 529 | } |
| 530 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 531 | /* |
| 532 | * Starts packet compression from the next packet on in both directions. |
| 533 | * Level is compression level 1 (fastest) - 9 (slow, best) as in gzip. |
| 534 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 535 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 536 | static int |
| 537 | ssh_packet_init_compression(struct ssh *ssh) |
Ben Lindstrom | fb50cdf | 2001-04-05 23:20:46 +0000 | [diff] [blame] | 538 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 539 | if (!ssh->state->compression_buffer && |
| 540 | ((ssh->state->compression_buffer = sshbuf_new()) == NULL)) |
| 541 | return SSH_ERR_ALLOC_FAIL; |
| 542 | return 0; |
| 543 | } |
| 544 | |
| 545 | static int |
| 546 | start_compression_out(struct ssh *ssh, int level) |
| 547 | { |
| 548 | if (level < 1 || level > 9) |
| 549 | return SSH_ERR_INVALID_ARGUMENT; |
| 550 | debug("Enabling compression at level %d.", level); |
| 551 | if (ssh->state->compression_out_started == 1) |
| 552 | deflateEnd(&ssh->state->compression_out_stream); |
| 553 | switch (deflateInit(&ssh->state->compression_out_stream, level)) { |
| 554 | case Z_OK: |
| 555 | ssh->state->compression_out_started = 1; |
| 556 | break; |
| 557 | case Z_MEM_ERROR: |
| 558 | return SSH_ERR_ALLOC_FAIL; |
| 559 | default: |
| 560 | return SSH_ERR_INTERNAL_ERROR; |
| 561 | } |
| 562 | return 0; |
| 563 | } |
| 564 | |
| 565 | static int |
| 566 | start_compression_in(struct ssh *ssh) |
| 567 | { |
| 568 | if (ssh->state->compression_in_started == 1) |
| 569 | inflateEnd(&ssh->state->compression_in_stream); |
| 570 | switch (inflateInit(&ssh->state->compression_in_stream)) { |
| 571 | case Z_OK: |
| 572 | ssh->state->compression_in_started = 1; |
| 573 | break; |
| 574 | case Z_MEM_ERROR: |
| 575 | return SSH_ERR_ALLOC_FAIL; |
| 576 | default: |
| 577 | return SSH_ERR_INTERNAL_ERROR; |
| 578 | } |
| 579 | return 0; |
| 580 | } |
| 581 | |
| 582 | int |
| 583 | ssh_packet_start_compression(struct ssh *ssh, int level) |
| 584 | { |
| 585 | int r; |
| 586 | |
| 587 | if (ssh->state->packet_compression && !compat20) |
| 588 | return SSH_ERR_INTERNAL_ERROR; |
| 589 | ssh->state->packet_compression = 1; |
| 590 | if ((r = ssh_packet_init_compression(ssh)) != 0 || |
| 591 | (r = start_compression_in(ssh)) != 0 || |
| 592 | (r = start_compression_out(ssh, level)) != 0) |
| 593 | return r; |
| 594 | return 0; |
| 595 | } |
| 596 | |
| 597 | /* XXX remove need for separate compression buffer */ |
| 598 | static int |
| 599 | compress_buffer(struct ssh *ssh, struct sshbuf *in, struct sshbuf *out) |
| 600 | { |
| 601 | u_char buf[4096]; |
| 602 | int r, status; |
| 603 | |
| 604 | if (ssh->state->compression_out_started != 1) |
| 605 | return SSH_ERR_INTERNAL_ERROR; |
| 606 | |
| 607 | /* This case is not handled below. */ |
| 608 | if (sshbuf_len(in) == 0) |
| 609 | return 0; |
| 610 | |
| 611 | /* Input is the contents of the input buffer. */ |
| 612 | if ((ssh->state->compression_out_stream.next_in = |
| 613 | sshbuf_mutable_ptr(in)) == NULL) |
| 614 | return SSH_ERR_INTERNAL_ERROR; |
| 615 | ssh->state->compression_out_stream.avail_in = sshbuf_len(in); |
| 616 | |
| 617 | /* Loop compressing until deflate() returns with avail_out != 0. */ |
| 618 | do { |
| 619 | /* Set up fixed-size output buffer. */ |
| 620 | ssh->state->compression_out_stream.next_out = buf; |
| 621 | ssh->state->compression_out_stream.avail_out = sizeof(buf); |
| 622 | |
| 623 | /* Compress as much data into the buffer as possible. */ |
| 624 | status = deflate(&ssh->state->compression_out_stream, |
| 625 | Z_PARTIAL_FLUSH); |
| 626 | switch (status) { |
| 627 | case Z_MEM_ERROR: |
| 628 | return SSH_ERR_ALLOC_FAIL; |
| 629 | case Z_OK: |
| 630 | /* Append compressed data to output_buffer. */ |
| 631 | if ((r = sshbuf_put(out, buf, sizeof(buf) - |
| 632 | ssh->state->compression_out_stream.avail_out)) != 0) |
| 633 | return r; |
| 634 | break; |
| 635 | case Z_STREAM_ERROR: |
| 636 | default: |
| 637 | ssh->state->compression_out_failures++; |
| 638 | return SSH_ERR_INVALID_FORMAT; |
| 639 | } |
| 640 | } while (ssh->state->compression_out_stream.avail_out == 0); |
| 641 | return 0; |
| 642 | } |
| 643 | |
| 644 | static int |
| 645 | uncompress_buffer(struct ssh *ssh, struct sshbuf *in, struct sshbuf *out) |
| 646 | { |
| 647 | u_char buf[4096]; |
| 648 | int r, status; |
| 649 | |
| 650 | if (ssh->state->compression_in_started != 1) |
| 651 | return SSH_ERR_INTERNAL_ERROR; |
| 652 | |
| 653 | if ((ssh->state->compression_in_stream.next_in = |
| 654 | sshbuf_mutable_ptr(in)) == NULL) |
| 655 | return SSH_ERR_INTERNAL_ERROR; |
| 656 | ssh->state->compression_in_stream.avail_in = sshbuf_len(in); |
| 657 | |
| 658 | for (;;) { |
| 659 | /* Set up fixed-size output buffer. */ |
| 660 | ssh->state->compression_in_stream.next_out = buf; |
| 661 | ssh->state->compression_in_stream.avail_out = sizeof(buf); |
| 662 | |
| 663 | status = inflate(&ssh->state->compression_in_stream, |
| 664 | Z_PARTIAL_FLUSH); |
| 665 | switch (status) { |
| 666 | case Z_OK: |
| 667 | if ((r = sshbuf_put(out, buf, sizeof(buf) - |
| 668 | ssh->state->compression_in_stream.avail_out)) != 0) |
| 669 | return r; |
| 670 | break; |
| 671 | case Z_BUF_ERROR: |
| 672 | /* |
| 673 | * Comments in zlib.h say that we should keep calling |
| 674 | * inflate() until we get an error. This appears to |
| 675 | * be the error that we get. |
| 676 | */ |
| 677 | return 0; |
| 678 | case Z_DATA_ERROR: |
| 679 | return SSH_ERR_INVALID_FORMAT; |
| 680 | case Z_MEM_ERROR: |
| 681 | return SSH_ERR_ALLOC_FAIL; |
| 682 | case Z_STREAM_ERROR: |
| 683 | default: |
| 684 | ssh->state->compression_in_failures++; |
| 685 | return SSH_ERR_INTERNAL_ERROR; |
| 686 | } |
| 687 | } |
| 688 | /* NOTREACHED */ |
| 689 | } |
| 690 | |
| 691 | /* Serialise compression state into a blob for privsep */ |
| 692 | static int |
| 693 | ssh_packet_get_compress_state(struct sshbuf *m, struct ssh *ssh) |
| 694 | { |
| 695 | struct session_state *state = ssh->state; |
| 696 | struct sshbuf *b; |
| 697 | int r; |
| 698 | |
| 699 | if ((b = sshbuf_new()) == NULL) |
| 700 | return SSH_ERR_ALLOC_FAIL; |
| 701 | if (state->compression_in_started) { |
| 702 | if ((r = sshbuf_put_string(b, &state->compression_in_stream, |
| 703 | sizeof(state->compression_in_stream))) != 0) |
| 704 | goto out; |
| 705 | } else if ((r = sshbuf_put_string(b, NULL, 0)) != 0) |
| 706 | goto out; |
| 707 | if (state->compression_out_started) { |
| 708 | if ((r = sshbuf_put_string(b, &state->compression_out_stream, |
| 709 | sizeof(state->compression_out_stream))) != 0) |
| 710 | goto out; |
| 711 | } else if ((r = sshbuf_put_string(b, NULL, 0)) != 0) |
| 712 | goto out; |
| 713 | r = sshbuf_put_stringb(m, b); |
| 714 | out: |
| 715 | sshbuf_free(b); |
| 716 | return r; |
| 717 | } |
| 718 | |
| 719 | /* Deserialise compression state from a blob for privsep */ |
| 720 | static int |
| 721 | ssh_packet_set_compress_state(struct ssh *ssh, struct sshbuf *m) |
| 722 | { |
| 723 | struct session_state *state = ssh->state; |
| 724 | struct sshbuf *b = NULL; |
| 725 | int r; |
| 726 | const u_char *inblob, *outblob; |
| 727 | size_t inl, outl; |
| 728 | |
| 729 | if ((r = sshbuf_froms(m, &b)) != 0) |
| 730 | goto out; |
| 731 | if ((r = sshbuf_get_string_direct(b, &inblob, &inl)) != 0 || |
| 732 | (r = sshbuf_get_string_direct(b, &outblob, &outl)) != 0) |
| 733 | goto out; |
| 734 | if (inl == 0) |
| 735 | state->compression_in_started = 0; |
| 736 | else if (inl != sizeof(state->compression_in_stream)) { |
| 737 | r = SSH_ERR_INTERNAL_ERROR; |
| 738 | goto out; |
| 739 | } else { |
| 740 | state->compression_in_started = 1; |
| 741 | memcpy(&state->compression_in_stream, inblob, inl); |
| 742 | } |
| 743 | if (outl == 0) |
| 744 | state->compression_out_started = 0; |
| 745 | else if (outl != sizeof(state->compression_out_stream)) { |
| 746 | r = SSH_ERR_INTERNAL_ERROR; |
| 747 | goto out; |
| 748 | } else { |
| 749 | state->compression_out_started = 1; |
| 750 | memcpy(&state->compression_out_stream, outblob, outl); |
| 751 | } |
| 752 | r = 0; |
| 753 | out: |
| 754 | sshbuf_free(b); |
| 755 | return r; |
Ben Lindstrom | fb50cdf | 2001-04-05 23:20:46 +0000 | [diff] [blame] | 756 | } |
| 757 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 758 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 759 | ssh_packet_set_compress_hooks(struct ssh *ssh, void *ctx, |
| 760 | void *(*allocfunc)(void *, u_int, u_int), |
| 761 | void (*freefunc)(void *, void *)) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 762 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 763 | ssh->state->compression_out_stream.zalloc = (alloc_func)allocfunc; |
| 764 | ssh->state->compression_out_stream.zfree = (free_func)freefunc; |
| 765 | ssh->state->compression_out_stream.opaque = ctx; |
| 766 | ssh->state->compression_in_stream.zalloc = (alloc_func)allocfunc; |
| 767 | ssh->state->compression_in_stream.zfree = (free_func)freefunc; |
| 768 | ssh->state->compression_in_stream.opaque = ctx; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 769 | } |
| 770 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 771 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 772 | * Causes any further packets to be encrypted using the given key. The same |
| 773 | * key is used for both sending and reception. However, both directions are |
| 774 | * encrypted independently of each other. |
| 775 | */ |
Ben Lindstrom | 402c6cc | 2002-06-21 00:43:42 +0000 | [diff] [blame] | 776 | |
Damien Miller | 1f0311c | 2014-05-15 14:24:09 +1000 | [diff] [blame] | 777 | #ifdef WITH_OPENSSL |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 778 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 779 | ssh_packet_set_encryption_key(struct ssh *ssh, const u_char *key, u_int keylen, int number) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 780 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 781 | struct session_state *state = ssh->state; |
| 782 | const struct sshcipher *cipher = cipher_by_number(number); |
| 783 | int r; |
| 784 | const char *wmsg; |
Damien Miller | 4f7becb | 2006-03-26 14:10:14 +1100 | [diff] [blame] | 785 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 786 | if (cipher == NULL) |
| 787 | fatal("%s: unknown cipher number %d", __func__, number); |
| 788 | if (keylen < 20) |
| 789 | fatal("%s: keylen too small: %d", __func__, keylen); |
| 790 | if (keylen > SSH_SESSION_KEY_LENGTH) |
| 791 | fatal("%s: keylen too big: %d", __func__, keylen); |
| 792 | memcpy(state->ssh1_key, key, keylen); |
| 793 | state->ssh1_keylen = keylen; |
| 794 | if ((r = cipher_init(&state->send_context, cipher, key, keylen, |
| 795 | NULL, 0, CIPHER_ENCRYPT)) != 0 || |
| 796 | (r = cipher_init(&state->receive_context, cipher, key, keylen, |
| 797 | NULL, 0, CIPHER_DECRYPT) != 0)) |
| 798 | fatal("%s: cipher_init failed: %s", __func__, ssh_err(r)); |
| 799 | if (!state->cipher_warning_done && |
| 800 | ((wmsg = cipher_warning_message(&state->send_context)) != NULL || |
| 801 | (wmsg = cipher_warning_message(&state->send_context)) != NULL)) { |
| 802 | error("Warning: %s", wmsg); |
| 803 | state->cipher_warning_done = 1; |
| 804 | } |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 805 | } |
Damien Miller | 6af914a | 2010-09-10 11:39:26 +1000 | [diff] [blame] | 806 | #endif |
Damien Miller | eb8b60e | 2010-08-31 22:41:14 +1000 | [diff] [blame] | 807 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 808 | /* |
| 809 | * Finalizes and sends the packet. If the encryption key has been set, |
| 810 | * encrypts the packet before sending. |
| 811 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 812 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 813 | int |
| 814 | ssh_packet_send1(struct ssh *ssh) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 815 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 816 | struct session_state *state = ssh->state; |
Ben Lindstrom | 4a7714a | 2002-02-26 18:04:38 +0000 | [diff] [blame] | 817 | u_char buf[8], *cp; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 818 | int r, padding, len; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 819 | u_int checksum; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 820 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 821 | /* |
| 822 | * If using packet compression, compress the payload of the outgoing |
| 823 | * packet. |
| 824 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 825 | if (state->packet_compression) { |
| 826 | sshbuf_reset(state->compression_buffer); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 827 | /* Skip padding. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 828 | if ((r = sshbuf_consume(state->outgoing_packet, 8)) != 0) |
| 829 | goto out; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 830 | /* padding */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 831 | if ((r = sshbuf_put(state->compression_buffer, |
| 832 | "\0\0\0\0\0\0\0\0", 8)) != 0) |
| 833 | goto out; |
| 834 | if ((r = compress_buffer(ssh, state->outgoing_packet, |
| 835 | state->compression_buffer)) != 0) |
| 836 | goto out; |
| 837 | sshbuf_reset(state->outgoing_packet); |
| 838 | if ((r = sshbuf_putb(state->outgoing_packet, |
| 839 | state->compression_buffer)) != 0) |
| 840 | goto out; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 841 | } |
| 842 | /* Compute packet length without padding (add checksum, remove padding). */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 843 | len = sshbuf_len(state->outgoing_packet) + 4 - 8; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 844 | |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 845 | /* Insert padding. Initialized to zero in packet_start1() */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 846 | padding = 8 - len % 8; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 847 | if (!state->send_context.plaintext) { |
| 848 | cp = sshbuf_mutable_ptr(state->outgoing_packet); |
| 849 | if (cp == NULL) { |
| 850 | r = SSH_ERR_INTERNAL_ERROR; |
| 851 | goto out; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 852 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 853 | arc4random_buf(cp + 8 - padding, padding); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 854 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 855 | if ((r = sshbuf_consume(state->outgoing_packet, 8 - padding)) != 0) |
| 856 | goto out; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 857 | |
| 858 | /* Add check bytes. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 859 | checksum = ssh_crc32(sshbuf_ptr(state->outgoing_packet), |
| 860 | sshbuf_len(state->outgoing_packet)); |
| 861 | POKE_U32(buf, checksum); |
| 862 | if ((r = sshbuf_put(state->outgoing_packet, buf, 4)) != 0) |
| 863 | goto out; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 864 | |
| 865 | #ifdef PACKET_DEBUG |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 866 | fprintf(stderr, "packet_send plain: "); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 867 | sshbuf_dump(state->outgoing_packet, stderr); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 868 | #endif |
| 869 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 870 | /* Append to output. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 871 | POKE_U32(buf, len); |
| 872 | if ((r = sshbuf_put(state->output, buf, 4)) != 0) |
| 873 | goto out; |
| 874 | if ((r = sshbuf_reserve(state->output, |
| 875 | sshbuf_len(state->outgoing_packet), &cp)) != 0) |
| 876 | goto out; |
| 877 | if ((r = cipher_crypt(&state->send_context, 0, cp, |
| 878 | sshbuf_ptr(state->outgoing_packet), |
| 879 | sshbuf_len(state->outgoing_packet), 0, 0)) != 0) |
| 880 | goto out; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 881 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 882 | #ifdef PACKET_DEBUG |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 883 | fprintf(stderr, "encrypted: "); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 884 | sshbuf_dump(state->output, stderr); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 885 | #endif |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 886 | state->p_send.packets++; |
| 887 | state->p_send.bytes += len + |
| 888 | sshbuf_len(state->outgoing_packet); |
| 889 | sshbuf_reset(state->outgoing_packet); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 890 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 891 | /* |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 892 | * Note that the packet is now only buffered in output. It won't be |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 893 | * actually sent until packet_write_wait or packet_write_poll is |
| 894 | * called. |
| 895 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 896 | r = 0; |
| 897 | out: |
| 898 | return r; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 899 | } |
| 900 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 901 | int |
| 902 | ssh_set_newkeys(struct ssh *ssh, int mode) |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 903 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 904 | struct session_state *state = ssh->state; |
| 905 | struct sshenc *enc; |
| 906 | struct sshmac *mac; |
| 907 | struct sshcomp *comp; |
| 908 | struct sshcipher_ctx *cc; |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 909 | u_int64_t *max_blocks; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 910 | const char *wmsg; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 911 | int r, crypt_type; |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 912 | |
Ben Lindstrom | 064496f | 2002-12-23 02:04:22 +0000 | [diff] [blame] | 913 | debug2("set_newkeys: mode %d", mode); |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 914 | |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 915 | if (mode == MODE_OUT) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 916 | cc = &state->send_context; |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 917 | crypt_type = CIPHER_ENCRYPT; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 918 | state->p_send.packets = state->p_send.blocks = 0; |
| 919 | max_blocks = &state->max_blocks_out; |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 920 | } else { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 921 | cc = &state->receive_context; |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 922 | crypt_type = CIPHER_DECRYPT; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 923 | state->p_read.packets = state->p_read.blocks = 0; |
| 924 | max_blocks = &state->max_blocks_in; |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 925 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 926 | if (state->newkeys[mode] != NULL) { |
Ben Lindstrom | 064496f | 2002-12-23 02:04:22 +0000 | [diff] [blame] | 927 | debug("set_newkeys: rekeying"); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 928 | if ((r = cipher_cleanup(cc)) != 0) |
| 929 | return r; |
| 930 | enc = &state->newkeys[mode]->enc; |
| 931 | mac = &state->newkeys[mode]->mac; |
| 932 | comp = &state->newkeys[mode]->comp; |
Damien Miller | e45796f | 2007-06-11 14:01:42 +1000 | [diff] [blame] | 933 | mac_clear(mac); |
Damien Miller | a5103f4 | 2014-02-04 11:20:14 +1100 | [diff] [blame] | 934 | explicit_bzero(enc->iv, enc->iv_len); |
| 935 | explicit_bzero(enc->key, enc->key_len); |
| 936 | explicit_bzero(mac->key, mac->key_len); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 937 | free(enc->name); |
| 938 | free(enc->iv); |
| 939 | free(enc->key); |
| 940 | free(mac->name); |
| 941 | free(mac->key); |
| 942 | free(comp->name); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 943 | free(state->newkeys[mode]); |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 944 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 945 | /* move newkeys from kex to state */ |
| 946 | if ((state->newkeys[mode] = ssh->kex->newkeys[mode]) == NULL) |
| 947 | return SSH_ERR_INTERNAL_ERROR; |
| 948 | ssh->kex->newkeys[mode] = NULL; |
| 949 | enc = &state->newkeys[mode]->enc; |
| 950 | mac = &state->newkeys[mode]->mac; |
| 951 | comp = &state->newkeys[mode]->comp; |
| 952 | if (cipher_authlen(enc->cipher) == 0) { |
| 953 | if ((r = mac_init(mac)) != 0) |
| 954 | return r; |
| 955 | } |
| 956 | mac->enabled = 1; |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 957 | DBG(debug("cipher_init_context: %d", mode)); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 958 | if ((r = cipher_init(cc, enc->cipher, enc->key, enc->key_len, |
| 959 | enc->iv, enc->iv_len, crypt_type)) != 0) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 960 | return r; |
| 961 | if (!state->cipher_warning_done && |
| 962 | (wmsg = cipher_warning_message(cc)) != NULL) { |
| 963 | error("Warning: %s", wmsg); |
| 964 | state->cipher_warning_done = 1; |
| 965 | } |
Ben Lindstrom | f6027d3 | 2002-03-22 01:42:04 +0000 | [diff] [blame] | 966 | /* Deleting the keys does not gain extra security */ |
Damien Miller | a5103f4 | 2014-02-04 11:20:14 +1100 | [diff] [blame] | 967 | /* explicit_bzero(enc->iv, enc->block_size); |
| 968 | explicit_bzero(enc->key, enc->key_len); |
| 969 | explicit_bzero(mac->key, mac->key_len); */ |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 970 | if ((comp->type == COMP_ZLIB || |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 971 | (comp->type == COMP_DELAYED && |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 972 | state->after_authentication)) && comp->enabled == 0) { |
| 973 | if ((r = ssh_packet_init_compression(ssh)) < 0) |
| 974 | return r; |
| 975 | if (mode == MODE_OUT) { |
| 976 | if ((r = start_compression_out(ssh, 6)) != 0) |
| 977 | return r; |
| 978 | } else { |
| 979 | if ((r = start_compression_in(ssh)) != 0) |
| 980 | return r; |
| 981 | } |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 982 | comp->enabled = 1; |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 983 | } |
Darren Tucker | 81a0b37 | 2003-07-14 17:31:06 +1000 | [diff] [blame] | 984 | /* |
| 985 | * The 2^(blocksize*2) limit is too expensive for 3DES, |
| 986 | * blowfish, etc, so enforce a 1GB limit for small blocksizes. |
| 987 | */ |
| 988 | if (enc->block_size >= 16) |
| 989 | *max_blocks = (u_int64_t)1 << (enc->block_size*2); |
| 990 | else |
| 991 | *max_blocks = ((u_int64_t)1 << 30) / enc->block_size; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 992 | if (state->rekey_limit) |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 993 | *max_blocks = MIN(*max_blocks, |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 994 | state->rekey_limit / enc->block_size); |
| 995 | return 0; |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 996 | } |
| 997 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 998 | /* |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 999 | * Delayed compression for SSH2 is enabled after authentication: |
Darren Tucker | f676c57 | 2006-08-05 18:51:08 +1000 | [diff] [blame] | 1000 | * This happens on the server side after a SSH2_MSG_USERAUTH_SUCCESS is sent, |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 1001 | * and on the client side after a SSH2_MSG_USERAUTH_SUCCESS is received. |
| 1002 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1003 | static int |
| 1004 | ssh_packet_enable_delayed_compress(struct ssh *ssh) |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 1005 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1006 | struct session_state *state = ssh->state; |
| 1007 | struct sshcomp *comp = NULL; |
| 1008 | int r, mode; |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 1009 | |
| 1010 | /* |
| 1011 | * Remember that we are past the authentication step, so rekeying |
| 1012 | * with COMP_DELAYED will turn on compression immediately. |
| 1013 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1014 | state->after_authentication = 1; |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 1015 | for (mode = 0; mode < MODE_MAX; mode++) { |
Darren Tucker | 4aa665b | 2006-09-21 13:00:25 +1000 | [diff] [blame] | 1016 | /* protocol error: USERAUTH_SUCCESS received before NEWKEYS */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1017 | if (state->newkeys[mode] == NULL) |
Darren Tucker | 4aa665b | 2006-09-21 13:00:25 +1000 | [diff] [blame] | 1018 | continue; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1019 | comp = &state->newkeys[mode]->comp; |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 1020 | if (comp && !comp->enabled && comp->type == COMP_DELAYED) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1021 | if ((r = ssh_packet_init_compression(ssh)) != 0) |
| 1022 | return r; |
| 1023 | if (mode == MODE_OUT) { |
| 1024 | if ((r = start_compression_out(ssh, 6)) != 0) |
| 1025 | return r; |
| 1026 | } else { |
| 1027 | if ((r = start_compression_in(ssh)) != 0) |
| 1028 | return r; |
| 1029 | } |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 1030 | comp->enabled = 1; |
| 1031 | } |
| 1032 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1033 | return 0; |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 1034 | } |
| 1035 | |
| 1036 | /* |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1037 | * Finalize packet in SSH2 format (compress, mac, encrypt, enqueue) |
| 1038 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1039 | int |
| 1040 | ssh_packet_send2_wrapped(struct ssh *ssh) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1041 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1042 | struct session_state *state = ssh->state; |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 1043 | u_char type, *cp, macbuf[SSH_DIGEST_MAX_LENGTH]; |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1044 | u_char padlen, pad = 0; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1045 | u_int authlen = 0, aadlen = 0; |
| 1046 | u_int len; |
| 1047 | struct sshenc *enc = NULL; |
| 1048 | struct sshmac *mac = NULL; |
| 1049 | struct sshcomp *comp = NULL; |
| 1050 | int r, block_size; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1051 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1052 | if (state->newkeys[MODE_OUT] != NULL) { |
| 1053 | enc = &state->newkeys[MODE_OUT]->enc; |
| 1054 | mac = &state->newkeys[MODE_OUT]->mac; |
| 1055 | comp = &state->newkeys[MODE_OUT]->comp; |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 1056 | /* disable mac for authenticated encryption */ |
| 1057 | if ((authlen = cipher_authlen(enc->cipher)) != 0) |
| 1058 | mac = NULL; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1059 | } |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 1060 | block_size = enc ? enc->block_size : 8; |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 1061 | aadlen = (mac && mac->enabled && mac->etm) || authlen ? 4 : 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1062 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1063 | type = (sshbuf_ptr(state->outgoing_packet))[5]; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1064 | |
| 1065 | #ifdef PACKET_DEBUG |
| 1066 | fprintf(stderr, "plain: "); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1067 | sshbuf_dump(state->outgoing_packet, stderr); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1068 | #endif |
| 1069 | |
| 1070 | if (comp && comp->enabled) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1071 | len = sshbuf_len(state->outgoing_packet); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1072 | /* skip header, compress only payload */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1073 | if ((r = sshbuf_consume(state->outgoing_packet, 5)) != 0) |
| 1074 | goto out; |
| 1075 | sshbuf_reset(state->compression_buffer); |
| 1076 | if ((r = compress_buffer(ssh, state->outgoing_packet, |
| 1077 | state->compression_buffer)) != 0) |
| 1078 | goto out; |
| 1079 | sshbuf_reset(state->outgoing_packet); |
| 1080 | if ((r = sshbuf_put(state->outgoing_packet, |
| 1081 | "\0\0\0\0\0", 5)) != 0 || |
| 1082 | (r = sshbuf_putb(state->outgoing_packet, |
| 1083 | state->compression_buffer)) != 0) |
| 1084 | goto out; |
| 1085 | DBG(debug("compression: raw %d compressed %zd", len, |
| 1086 | sshbuf_len(state->outgoing_packet))); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1087 | } |
| 1088 | |
| 1089 | /* sizeof (packet_len + pad_len + payload) */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1090 | len = sshbuf_len(state->outgoing_packet); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1091 | |
| 1092 | /* |
| 1093 | * calc size of padding, alloc space, get random data, |
| 1094 | * minimum padding is 4 bytes |
| 1095 | */ |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1096 | len -= aadlen; /* packet length is not encrypted for EtM modes */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1097 | padlen = block_size - (len % block_size); |
| 1098 | if (padlen < 4) |
| 1099 | padlen += block_size; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1100 | if (state->extra_pad) { |
Damien Miller | 9f64390 | 2001-11-12 11:02:52 +1100 | [diff] [blame] | 1101 | /* will wrap if extra_pad+padlen > 255 */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1102 | state->extra_pad = |
| 1103 | roundup(state->extra_pad, block_size); |
| 1104 | pad = state->extra_pad - |
| 1105 | ((len + padlen) % state->extra_pad); |
Damien Miller | 2a32843 | 2014-04-20 13:24:01 +1000 | [diff] [blame] | 1106 | DBG(debug3("%s: adding %d (len %d padlen %d extra_pad %d)", |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1107 | __func__, pad, len, padlen, state->extra_pad)); |
Damien Miller | 9f64390 | 2001-11-12 11:02:52 +1100 | [diff] [blame] | 1108 | padlen += pad; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1109 | state->extra_pad = 0; |
Damien Miller | 9f64390 | 2001-11-12 11:02:52 +1100 | [diff] [blame] | 1110 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1111 | if ((r = sshbuf_reserve(state->outgoing_packet, padlen, &cp)) != 0) |
| 1112 | goto out; |
| 1113 | if (enc && !state->send_context.plaintext) { |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 1114 | /* random padding */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1115 | arc4random_buf(cp, padlen); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 1116 | } else { |
| 1117 | /* clear padding */ |
Damien Miller | a5103f4 | 2014-02-04 11:20:14 +1100 | [diff] [blame] | 1118 | explicit_bzero(cp, padlen); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1119 | } |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1120 | /* sizeof (packet_len + pad_len + payload + padding) */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1121 | len = sshbuf_len(state->outgoing_packet); |
| 1122 | cp = sshbuf_mutable_ptr(state->outgoing_packet); |
| 1123 | if (cp == NULL) { |
| 1124 | r = SSH_ERR_INTERNAL_ERROR; |
| 1125 | goto out; |
| 1126 | } |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1127 | /* packet_length includes payload, padding and padding length field */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1128 | POKE_U32(cp, len - 4); |
Ben Lindstrom | 4a7714a | 2002-02-26 18:04:38 +0000 | [diff] [blame] | 1129 | cp[4] = padlen; |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1130 | DBG(debug("send: len %d (includes padlen %d, aadlen %d)", |
| 1131 | len, padlen, aadlen)); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1132 | |
| 1133 | /* compute MAC over seqnr and packet(length fields, payload, padding) */ |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1134 | if (mac && mac->enabled && !mac->etm) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1135 | if ((r = mac_compute(mac, state->p_send.seqnr, |
| 1136 | sshbuf_ptr(state->outgoing_packet), len, |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 1137 | macbuf, sizeof(macbuf))) != 0) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1138 | goto out; |
| 1139 | DBG(debug("done calc MAC out #%d", state->p_send.seqnr)); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1140 | } |
| 1141 | /* encrypt packet and append to output buffer. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1142 | if ((r = sshbuf_reserve(state->output, |
| 1143 | sshbuf_len(state->outgoing_packet) + authlen, &cp)) != 0) |
| 1144 | goto out; |
| 1145 | if ((r = cipher_crypt(&state->send_context, state->p_send.seqnr, cp, |
| 1146 | sshbuf_ptr(state->outgoing_packet), |
| 1147 | len - aadlen, aadlen, authlen)) != 0) |
| 1148 | goto out; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1149 | /* append unencrypted MAC */ |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1150 | if (mac && mac->enabled) { |
| 1151 | if (mac->etm) { |
| 1152 | /* EtM: compute mac over aadlen + cipher text */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1153 | if ((r = mac_compute(mac, state->p_send.seqnr, |
| 1154 | cp, len, macbuf, sizeof(macbuf))) != 0) |
| 1155 | goto out; |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1156 | DBG(debug("done calc MAC(EtM) out #%d", |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1157 | state->p_send.seqnr)); |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1158 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1159 | if ((r = sshbuf_put(state->output, macbuf, mac->mac_len)) != 0) |
| 1160 | goto out; |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1161 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1162 | #ifdef PACKET_DEBUG |
| 1163 | fprintf(stderr, "encrypted: "); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1164 | sshbuf_dump(state->output, stderr); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1165 | #endif |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1166 | /* increment sequence number for outgoing packets */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1167 | if (++state->p_send.seqnr == 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1168 | logit("outgoing seqnr wraps around"); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1169 | if (++state->p_send.packets == 0) |
| 1170 | if (!(ssh->compat & SSH_BUG_NOREKEY)) |
| 1171 | return SSH_ERR_NEED_REKEY; |
| 1172 | state->p_send.blocks += len / block_size; |
| 1173 | state->p_send.bytes += len; |
| 1174 | sshbuf_reset(state->outgoing_packet); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1175 | |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 1176 | if (type == SSH2_MSG_NEWKEYS) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1177 | r = ssh_set_newkeys(ssh, MODE_OUT); |
| 1178 | else if (type == SSH2_MSG_USERAUTH_SUCCESS && state->server_side) |
| 1179 | r = ssh_packet_enable_delayed_compress(ssh); |
| 1180 | else |
| 1181 | r = 0; |
| 1182 | out: |
| 1183 | return r; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1184 | } |
| 1185 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1186 | int |
| 1187 | ssh_packet_send2(struct ssh *ssh) |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1188 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1189 | struct session_state *state = ssh->state; |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1190 | struct packet *p; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1191 | u_char type; |
| 1192 | int r; |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1193 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1194 | type = sshbuf_ptr(state->outgoing_packet)[5]; |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1195 | |
| 1196 | /* during rekeying we can only send key exchange messages */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1197 | if (state->rekeying) { |
Damien Miller | 1de2cfe | 2012-02-11 08:18:43 +1100 | [diff] [blame] | 1198 | if ((type < SSH2_MSG_TRANSPORT_MIN) || |
| 1199 | (type > SSH2_MSG_TRANSPORT_MAX) || |
| 1200 | (type == SSH2_MSG_SERVICE_REQUEST) || |
| 1201 | (type == SSH2_MSG_SERVICE_ACCEPT)) { |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1202 | debug("enqueue packet: %u", type); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1203 | p = calloc(1, sizeof(*p)); |
| 1204 | if (p == NULL) |
| 1205 | return SSH_ERR_ALLOC_FAIL; |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1206 | p->type = type; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1207 | p->payload = state->outgoing_packet; |
| 1208 | TAILQ_INSERT_TAIL(&state->outgoing, p, next); |
| 1209 | state->outgoing_packet = sshbuf_new(); |
| 1210 | if (state->outgoing_packet == NULL) |
| 1211 | return SSH_ERR_ALLOC_FAIL; |
| 1212 | return 0; |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1213 | } |
| 1214 | } |
| 1215 | |
| 1216 | /* rekeying starts with sending KEXINIT */ |
| 1217 | if (type == SSH2_MSG_KEXINIT) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1218 | state->rekeying = 1; |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1219 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1220 | if ((r = ssh_packet_send2_wrapped(ssh)) != 0) |
| 1221 | return r; |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1222 | |
| 1223 | /* after a NEWKEYS message we can send the complete queue */ |
| 1224 | if (type == SSH2_MSG_NEWKEYS) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1225 | state->rekeying = 0; |
| 1226 | state->rekey_time = monotime(); |
| 1227 | while ((p = TAILQ_FIRST(&state->outgoing))) { |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1228 | type = p->type; |
| 1229 | debug("dequeue packet: %u", type); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1230 | sshbuf_free(state->outgoing_packet); |
| 1231 | state->outgoing_packet = p->payload; |
| 1232 | TAILQ_REMOVE(&state->outgoing, p, next); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1233 | free(p); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1234 | if ((r = ssh_packet_send2_wrapped(ssh)) != 0) |
| 1235 | return r; |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1236 | } |
| 1237 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1238 | return 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1239 | } |
| 1240 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1241 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1242 | * Waits until a packet has been received, and returns its type. Note that |
| 1243 | * no other data is processed until this returns, so this function should not |
| 1244 | * be used during the interactive session. |
| 1245 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1246 | |
| 1247 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1248 | ssh_packet_read_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1249 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1250 | struct session_state *state = ssh->state; |
| 1251 | int len, r, ms_remain, cont; |
Ben Lindstrom | cb978aa | 2001-03-05 07:07:49 +0000 | [diff] [blame] | 1252 | fd_set *setp; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1253 | char buf[8192]; |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1254 | struct timeval timeout, start, *timeoutp = NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1255 | |
Darren Tucker | 99bb761 | 2008-06-13 22:02:50 +1000 | [diff] [blame] | 1256 | DBG(debug("packet_read()")); |
| 1257 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1258 | setp = (fd_set *)calloc(howmany(state->connection_in + 1, |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 1259 | NFDBITS), sizeof(fd_mask)); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1260 | if (setp == NULL) |
| 1261 | return SSH_ERR_ALLOC_FAIL; |
Ben Lindstrom | cb978aa | 2001-03-05 07:07:49 +0000 | [diff] [blame] | 1262 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1263 | /* Since we are blocking, ensure that all written packets have been sent. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1264 | ssh_packet_write_wait(ssh); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1265 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1266 | /* Stay in the loop until we have received a complete packet. */ |
| 1267 | for (;;) { |
| 1268 | /* Try to read a packet from the buffer. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1269 | r = ssh_packet_read_poll_seqnr(ssh, typep, seqnr_p); |
| 1270 | if (r != 0) |
| 1271 | break; |
Ben Lindstrom | 80c6d77 | 2001-06-05 21:09:18 +0000 | [diff] [blame] | 1272 | if (!compat20 && ( |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1273 | *typep == SSH_SMSG_SUCCESS |
| 1274 | || *typep == SSH_SMSG_FAILURE |
| 1275 | || *typep == SSH_CMSG_EOF |
| 1276 | || *typep == SSH_CMSG_EXIT_CONFIRMATION)) |
| 1277 | if ((r = sshpkt_get_end(ssh)) != 0) |
| 1278 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1279 | /* If we got a packet, return it. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1280 | if (*typep != SSH_MSG_NONE) |
| 1281 | break; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1282 | /* |
| 1283 | * Otherwise, wait for some data to arrive, add it to the |
| 1284 | * buffer, and try again. |
| 1285 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1286 | memset(setp, 0, howmany(state->connection_in + 1, |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 1287 | NFDBITS) * sizeof(fd_mask)); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1288 | FD_SET(state->connection_in, setp); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1289 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1290 | if (state->packet_timeout_ms > 0) { |
| 1291 | ms_remain = state->packet_timeout_ms; |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1292 | timeoutp = &timeout; |
| 1293 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1294 | /* Wait for some data to arrive. */ |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1295 | for (;;) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1296 | if (state->packet_timeout_ms != -1) { |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1297 | ms_to_timeval(&timeout, ms_remain); |
| 1298 | gettimeofday(&start, NULL); |
| 1299 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1300 | if ((r = select(state->connection_in + 1, setp, |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 1301 | NULL, NULL, timeoutp)) >= 0) |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1302 | break; |
Damien Miller | ea43742 | 2009-10-02 11:49:03 +1000 | [diff] [blame] | 1303 | if (errno != EAGAIN && errno != EINTR && |
| 1304 | errno != EWOULDBLOCK) |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1305 | break; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1306 | if (state->packet_timeout_ms == -1) |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1307 | continue; |
| 1308 | ms_subtract_diff(&start, &ms_remain); |
| 1309 | if (ms_remain <= 0) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1310 | r = 0; |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1311 | break; |
| 1312 | } |
| 1313 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1314 | if (r == 0) { |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1315 | logit("Connection to %.200s timed out while " |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1316 | "waiting to read", ssh_remote_ipaddr(ssh)); |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1317 | cleanup_exit(255); |
| 1318 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1319 | /* Read data from the socket. */ |
Darren Tucker | c5564e1 | 2009-06-21 18:53:53 +1000 | [diff] [blame] | 1320 | do { |
| 1321 | cont = 0; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1322 | len = roaming_read(state->connection_in, buf, |
Darren Tucker | c5564e1 | 2009-06-21 18:53:53 +1000 | [diff] [blame] | 1323 | sizeof(buf), &cont); |
| 1324 | } while (len == 0 && cont); |
Damien Miller | 5e7c10e | 1999-12-16 13:18:04 +1100 | [diff] [blame] | 1325 | if (len == 0) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1326 | logit("Connection closed by %.200s", |
| 1327 | ssh_remote_ipaddr(ssh)); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1328 | cleanup_exit(255); |
Damien Miller | 5e7c10e | 1999-12-16 13:18:04 +1100 | [diff] [blame] | 1329 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1330 | if (len < 0) |
| 1331 | fatal("Read from socket failed: %.100s", strerror(errno)); |
| 1332 | /* Append it to the buffer. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1333 | ssh_packet_process_incoming(ssh, buf, len); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1334 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1335 | free(setp); |
| 1336 | return r; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1337 | } |
| 1338 | |
Damien Miller | 278f907 | 2001-12-21 15:00:19 +1100 | [diff] [blame] | 1339 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1340 | ssh_packet_read(struct ssh *ssh) |
Damien Miller | 278f907 | 2001-12-21 15:00:19 +1100 | [diff] [blame] | 1341 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1342 | u_char type; |
| 1343 | int r; |
| 1344 | |
| 1345 | if ((r = ssh_packet_read_seqnr(ssh, &type, NULL)) != 0) |
| 1346 | fatal("%s: %s", __func__, ssh_err(r)); |
| 1347 | return type; |
Damien Miller | 278f907 | 2001-12-21 15:00:19 +1100 | [diff] [blame] | 1348 | } |
| 1349 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1350 | /* |
| 1351 | * Waits until a packet has been received, verifies that its type matches |
| 1352 | * that given, and gives a fatal error and exits if there is a mismatch. |
| 1353 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1354 | |
| 1355 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1356 | ssh_packet_read_expect(struct ssh *ssh, int expected_type) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1357 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1358 | int type; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1359 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1360 | type = ssh_packet_read(ssh); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1361 | if (type != expected_type) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1362 | ssh_packet_disconnect(ssh, |
| 1363 | "Protocol error: expected packet type %d, got %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1364 | expected_type, type); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1365 | } |
| 1366 | |
| 1367 | /* Checks if a full packet is available in the data received so far via |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1368 | * packet_process_incoming. If so, reads the packet; otherwise returns |
| 1369 | * SSH_MSG_NONE. This does not wait for data from the connection. |
| 1370 | * |
Damien Miller | 5ed3d57 | 2008-02-10 22:27:47 +1100 | [diff] [blame] | 1371 | * SSH_MSG_DISCONNECT is handled specially here. Also, |
| 1372 | * SSH_MSG_IGNORE messages are skipped by this function and are never returned |
| 1373 | * to higher levels. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1374 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1375 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1376 | int |
| 1377 | ssh_packet_read_poll1(struct ssh *ssh, u_char *typep) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1378 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1379 | struct session_state *state = ssh->state; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1380 | u_int len, padded_len; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1381 | const u_char *cp; |
| 1382 | u_char *p; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1383 | u_int checksum, stored_checksum; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1384 | int r; |
| 1385 | |
| 1386 | *typep = SSH_MSG_NONE; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1387 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1388 | /* Check if input size is less than minimum packet size. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1389 | if (sshbuf_len(state->input) < 4 + 8) |
| 1390 | return 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1391 | /* Get length of incoming packet. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1392 | len = PEEK_U32(sshbuf_ptr(state->input)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1393 | if (len < 1 + 2 + 2 || len > 256 * 1024) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1394 | ssh_packet_disconnect(ssh, "Bad packet length %u.", |
| 1395 | len); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1396 | padded_len = (len + 8) & ~7; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1397 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1398 | /* Check if the packet has been entirely received. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1399 | if (sshbuf_len(state->input) < 4 + padded_len) |
| 1400 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1401 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1402 | /* The entire packet is in buffer. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1403 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1404 | /* Consume packet length. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1405 | if ((r = sshbuf_consume(state->input, 4)) != 0) |
| 1406 | goto out; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1407 | |
Ben Lindstrom | 80c6d77 | 2001-06-05 21:09:18 +0000 | [diff] [blame] | 1408 | /* |
| 1409 | * Cryptographic attack detector for ssh |
| 1410 | * (C)1998 CORE-SDI, Buenos Aires Argentina |
| 1411 | * Ariel Futoransky(futo@core-sdi.com) |
| 1412 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1413 | if (!state->receive_context.plaintext) { |
| 1414 | switch (detect_attack(&state->deattack, |
| 1415 | sshbuf_ptr(state->input), padded_len)) { |
| 1416 | case DEATTACK_OK: |
| 1417 | break; |
Damien Miller | 3c9c1fb | 2006-09-17 06:08:53 +1000 | [diff] [blame] | 1418 | case DEATTACK_DETECTED: |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1419 | ssh_packet_disconnect(ssh, |
| 1420 | "crc32 compensation attack: network attack detected" |
| 1421 | ); |
Damien Miller | 3c9c1fb | 2006-09-17 06:08:53 +1000 | [diff] [blame] | 1422 | case DEATTACK_DOS_DETECTED: |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1423 | ssh_packet_disconnect(ssh, |
| 1424 | "deattack denial of service detected"); |
| 1425 | default: |
| 1426 | ssh_packet_disconnect(ssh, "deattack error"); |
Damien Miller | 3c9c1fb | 2006-09-17 06:08:53 +1000 | [diff] [blame] | 1427 | } |
| 1428 | } |
Ben Lindstrom | 80c6d77 | 2001-06-05 21:09:18 +0000 | [diff] [blame] | 1429 | |
| 1430 | /* Decrypt data to incoming_packet. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1431 | sshbuf_reset(state->incoming_packet); |
| 1432 | if ((r = sshbuf_reserve(state->incoming_packet, padded_len, &p)) != 0) |
| 1433 | goto out; |
| 1434 | if ((r = cipher_crypt(&state->receive_context, 0, p, |
| 1435 | sshbuf_ptr(state->input), padded_len, 0, 0)) != 0) |
| 1436 | goto out; |
Ben Lindstrom | 80c6d77 | 2001-06-05 21:09:18 +0000 | [diff] [blame] | 1437 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1438 | if ((r = sshbuf_consume(state->input, padded_len)) != 0) |
| 1439 | goto out; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1440 | |
| 1441 | #ifdef PACKET_DEBUG |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1442 | fprintf(stderr, "read_poll plain: "); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1443 | sshbuf_dump(state->incoming_packet, stderr); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1444 | #endif |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1445 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1446 | /* Compute packet checksum. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1447 | checksum = ssh_crc32(sshbuf_ptr(state->incoming_packet), |
| 1448 | sshbuf_len(state->incoming_packet) - 4); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1449 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1450 | /* Skip padding. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1451 | if ((r = sshbuf_consume(state->incoming_packet, 8 - len % 8)) != 0) |
| 1452 | goto out; |
Damien Miller | fd7c911 | 1999-11-08 16:15:55 +1100 | [diff] [blame] | 1453 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1454 | /* Test check bytes. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1455 | if (len != sshbuf_len(state->incoming_packet)) |
| 1456 | ssh_packet_disconnect(ssh, |
| 1457 | "packet_read_poll1: len %d != sshbuf_len %zd.", |
| 1458 | len, sshbuf_len(state->incoming_packet)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1459 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1460 | cp = sshbuf_ptr(state->incoming_packet) + len - 4; |
| 1461 | stored_checksum = PEEK_U32(cp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1462 | if (checksum != stored_checksum) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1463 | ssh_packet_disconnect(ssh, |
| 1464 | "Corrupted check bytes on input."); |
| 1465 | if ((r = sshbuf_consume_end(state->incoming_packet, 4)) < 0) |
| 1466 | goto out; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1467 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1468 | if (state->packet_compression) { |
| 1469 | sshbuf_reset(state->compression_buffer); |
| 1470 | if ((r = uncompress_buffer(ssh, state->incoming_packet, |
| 1471 | state->compression_buffer)) != 0) |
| 1472 | goto out; |
| 1473 | sshbuf_reset(state->incoming_packet); |
| 1474 | if ((r = sshbuf_putb(state->incoming_packet, |
| 1475 | state->compression_buffer)) != 0) |
| 1476 | goto out; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1477 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1478 | state->p_read.packets++; |
| 1479 | state->p_read.bytes += padded_len + 4; |
| 1480 | if ((r = sshbuf_get_u8(state->incoming_packet, typep)) != 0) |
| 1481 | goto out; |
| 1482 | if (*typep < SSH_MSG_MIN || *typep > SSH_MSG_MAX) |
| 1483 | ssh_packet_disconnect(ssh, |
| 1484 | "Invalid ssh1 packet type: %d", *typep); |
| 1485 | r = 0; |
| 1486 | out: |
| 1487 | return r; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1488 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1489 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1490 | int |
| 1491 | ssh_packet_read_poll2(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1492 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1493 | struct session_state *state = ssh->state; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1494 | u_int padlen, need; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1495 | u_char *cp, macbuf[SSH_DIGEST_MAX_LENGTH]; |
| 1496 | u_int maclen, aadlen = 0, authlen = 0, block_size; |
| 1497 | struct sshenc *enc = NULL; |
| 1498 | struct sshmac *mac = NULL; |
| 1499 | struct sshcomp *comp = NULL; |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 1500 | int r; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1501 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1502 | *typep = SSH_MSG_NONE; |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 1503 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1504 | if (state->packet_discard) |
| 1505 | return 0; |
| 1506 | |
| 1507 | if (state->newkeys[MODE_IN] != NULL) { |
| 1508 | enc = &state->newkeys[MODE_IN]->enc; |
| 1509 | mac = &state->newkeys[MODE_IN]->mac; |
| 1510 | comp = &state->newkeys[MODE_IN]->comp; |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 1511 | /* disable mac for authenticated encryption */ |
| 1512 | if ((authlen = cipher_authlen(enc->cipher)) != 0) |
| 1513 | mac = NULL; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1514 | } |
| 1515 | maclen = mac && mac->enabled ? mac->mac_len : 0; |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 1516 | block_size = enc ? enc->block_size : 8; |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 1517 | aadlen = (mac && mac->enabled && mac->etm) || authlen ? 4 : 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1518 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1519 | if (aadlen && state->packlen == 0) { |
| 1520 | if (cipher_get_length(&state->receive_context, |
| 1521 | &state->packlen, state->p_read.seqnr, |
| 1522 | sshbuf_ptr(state->input), sshbuf_len(state->input)) != 0) |
| 1523 | return 0; |
| 1524 | if (state->packlen < 1 + 4 || |
| 1525 | state->packlen > PACKET_MAX_SIZE) { |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1526 | #ifdef PACKET_DEBUG |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1527 | sshbuf_dump(state->input, stderr); |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1528 | #endif |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1529 | logit("Bad packet length %u.", state->packlen); |
| 1530 | if ((r = sshpkt_disconnect(ssh, "Packet corrupt")) != 0) |
| 1531 | return r; |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1532 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1533 | sshbuf_reset(state->incoming_packet); |
| 1534 | } else if (state->packlen == 0) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1535 | /* |
| 1536 | * check if input size is less than the cipher block size, |
| 1537 | * decrypt first block and extract length of incoming packet |
| 1538 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1539 | if (sshbuf_len(state->input) < block_size) |
| 1540 | return 0; |
| 1541 | sshbuf_reset(state->incoming_packet); |
| 1542 | if ((r = sshbuf_reserve(state->incoming_packet, block_size, |
| 1543 | &cp)) != 0) |
| 1544 | goto out; |
| 1545 | if ((r = cipher_crypt(&state->receive_context, |
| 1546 | state->p_send.seqnr, cp, sshbuf_ptr(state->input), |
| 1547 | block_size, 0, 0)) != 0) |
| 1548 | goto out; |
| 1549 | state->packlen = PEEK_U32(sshbuf_ptr(state->incoming_packet)); |
| 1550 | if (state->packlen < 1 + 4 || |
| 1551 | state->packlen > PACKET_MAX_SIZE) { |
Darren Tucker | a8151da | 2003-09-22 21:06:46 +1000 | [diff] [blame] | 1552 | #ifdef PACKET_DEBUG |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1553 | fprintf(stderr, "input: \n"); |
| 1554 | sshbuf_dump(state->input, stderr); |
| 1555 | fprintf(stderr, "incoming_packet: \n"); |
| 1556 | sshbuf_dump(state->incoming_packet, stderr); |
Darren Tucker | a8151da | 2003-09-22 21:06:46 +1000 | [diff] [blame] | 1557 | #endif |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1558 | logit("Bad packet length %u.", state->packlen); |
| 1559 | return ssh_packet_start_discard(ssh, enc, mac, |
| 1560 | state->packlen, PACKET_MAX_SIZE); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1561 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1562 | if ((r = sshbuf_consume(state->input, block_size)) != 0) |
| 1563 | goto out; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1564 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1565 | DBG(debug("input: packet len %u", state->packlen+4)); |
| 1566 | |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1567 | if (aadlen) { |
| 1568 | /* only the payload is encrypted */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1569 | need = state->packlen; |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1570 | } else { |
| 1571 | /* |
| 1572 | * the payload size and the payload are encrypted, but we |
| 1573 | * have a partial packet of block_size bytes |
| 1574 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1575 | need = 4 + state->packlen - block_size; |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1576 | } |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 1577 | DBG(debug("partial packet: block %d, need %d, maclen %d, authlen %d," |
| 1578 | " aadlen %d", block_size, need, maclen, authlen, aadlen)); |
Darren Tucker | 99d11a3 | 2008-12-01 21:40:48 +1100 | [diff] [blame] | 1579 | if (need % block_size != 0) { |
| 1580 | logit("padding error: need %d block %d mod %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1581 | need, block_size, need % block_size); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1582 | return ssh_packet_start_discard(ssh, enc, mac, |
| 1583 | state->packlen, PACKET_MAX_SIZE - block_size); |
Darren Tucker | 99d11a3 | 2008-12-01 21:40:48 +1100 | [diff] [blame] | 1584 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1585 | /* |
| 1586 | * check if the entire packet has been received and |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1587 | * decrypt into incoming_packet: |
| 1588 | * 'aadlen' bytes are unencrypted, but authenticated. |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 1589 | * 'need' bytes are encrypted, followed by either |
| 1590 | * 'authlen' bytes of authentication tag or |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1591 | * 'maclen' bytes of message authentication code. |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1592 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1593 | if (sshbuf_len(state->input) < aadlen + need + authlen + maclen) |
| 1594 | return 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1595 | #ifdef PACKET_DEBUG |
| 1596 | fprintf(stderr, "read_poll enc/full: "); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1597 | sshbuf_dump(state->input, stderr); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1598 | #endif |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1599 | /* EtM: compute mac over encrypted input */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1600 | if (mac && mac->enabled && mac->etm) { |
| 1601 | if ((r = mac_compute(mac, state->p_read.seqnr, |
| 1602 | sshbuf_ptr(state->input), aadlen + need, |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 1603 | macbuf, sizeof(macbuf))) != 0) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1604 | goto out; |
| 1605 | } |
| 1606 | if ((r = sshbuf_reserve(state->incoming_packet, aadlen + need, |
| 1607 | &cp)) != 0) |
| 1608 | goto out; |
| 1609 | if ((r = cipher_crypt(&state->receive_context, state->p_read.seqnr, cp, |
| 1610 | sshbuf_ptr(state->input), need, aadlen, authlen)) != 0) |
| 1611 | goto out; |
| 1612 | if ((r = sshbuf_consume(state->input, aadlen + need + authlen)) != 0) |
| 1613 | goto out; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1614 | /* |
| 1615 | * compute MAC over seqnr and packet, |
| 1616 | * increment sequence number for incoming packet |
| 1617 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1618 | if (mac && mac->enabled) { |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1619 | if (!mac->etm) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1620 | if ((r = mac_compute(mac, state->p_read.seqnr, |
| 1621 | sshbuf_ptr(state->incoming_packet), |
| 1622 | sshbuf_len(state->incoming_packet), |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 1623 | macbuf, sizeof(macbuf))) != 0) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1624 | goto out; |
| 1625 | if (timingsafe_bcmp(macbuf, sshbuf_ptr(state->input), |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 1626 | mac->mac_len) != 0) { |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 1627 | logit("Corrupted MAC on input."); |
| 1628 | if (need > PACKET_MAX_SIZE) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1629 | return SSH_ERR_INTERNAL_ERROR; |
| 1630 | return ssh_packet_start_discard(ssh, enc, mac, |
| 1631 | state->packlen, PACKET_MAX_SIZE - need); |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 1632 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1633 | |
| 1634 | DBG(debug("MAC #%d ok", state->p_read.seqnr)); |
| 1635 | if ((r = sshbuf_consume(state->input, mac->mac_len)) != 0) |
| 1636 | goto out; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1637 | } |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 1638 | /* XXX now it's safe to use fatal/packet_disconnect */ |
Damien Miller | 278f907 | 2001-12-21 15:00:19 +1100 | [diff] [blame] | 1639 | if (seqnr_p != NULL) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1640 | *seqnr_p = state->p_read.seqnr; |
| 1641 | if (++state->p_read.seqnr == 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1642 | logit("incoming seqnr wraps around"); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1643 | if (++state->p_read.packets == 0) |
| 1644 | if (!(ssh->compat & SSH_BUG_NOREKEY)) |
| 1645 | return SSH_ERR_NEED_REKEY; |
| 1646 | state->p_read.blocks += (state->packlen + 4) / block_size; |
| 1647 | state->p_read.bytes += state->packlen + 4; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1648 | |
| 1649 | /* get padlen */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1650 | padlen = sshbuf_ptr(state->incoming_packet)[4]; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1651 | DBG(debug("input: padlen %d", padlen)); |
| 1652 | if (padlen < 4) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1653 | ssh_packet_disconnect(ssh, |
| 1654 | "Corrupted padlen %d on input.", padlen); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1655 | |
| 1656 | /* skip packet size + padlen, discard padding */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1657 | if ((r = sshbuf_consume(state->incoming_packet, 4 + 1)) != 0 || |
| 1658 | ((r = sshbuf_consume_end(state->incoming_packet, padlen)) != 0)) |
| 1659 | goto out; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1660 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1661 | DBG(debug("input: len before de-compress %zd", |
| 1662 | sshbuf_len(state->incoming_packet))); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1663 | if (comp && comp->enabled) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1664 | sshbuf_reset(state->compression_buffer); |
| 1665 | if ((r = uncompress_buffer(ssh, state->incoming_packet, |
| 1666 | state->compression_buffer)) != 0) |
| 1667 | goto out; |
| 1668 | sshbuf_reset(state->incoming_packet); |
| 1669 | if ((r = sshbuf_putb(state->incoming_packet, |
| 1670 | state->compression_buffer)) != 0) |
| 1671 | goto out; |
| 1672 | DBG(debug("input: len after de-compress %zd", |
| 1673 | sshbuf_len(state->incoming_packet))); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1674 | } |
| 1675 | /* |
| 1676 | * get packet type, implies consume. |
| 1677 | * return length of payload (without type field) |
| 1678 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1679 | if ((r = sshbuf_get_u8(state->incoming_packet, typep)) != 0) |
| 1680 | goto out; |
| 1681 | if (*typep < SSH2_MSG_MIN || *typep >= SSH2_MSG_LOCAL_MIN) |
| 1682 | ssh_packet_disconnect(ssh, |
| 1683 | "Invalid ssh2 packet type: %d", *typep); |
| 1684 | if (*typep == SSH2_MSG_NEWKEYS) |
| 1685 | r = ssh_set_newkeys(ssh, MODE_IN); |
| 1686 | else if (*typep == SSH2_MSG_USERAUTH_SUCCESS && !state->server_side) |
| 1687 | r = ssh_packet_enable_delayed_compress(ssh); |
| 1688 | else |
| 1689 | r = 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1690 | #ifdef PACKET_DEBUG |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1691 | fprintf(stderr, "read/plain[%d]:\r\n", *typep); |
| 1692 | sshbuf_dump(state->incoming_packet, stderr); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1693 | #endif |
Ben Lindstrom | 80c6d77 | 2001-06-05 21:09:18 +0000 | [diff] [blame] | 1694 | /* reset for next packet */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1695 | state->packlen = 0; |
| 1696 | out: |
| 1697 | return r; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1698 | } |
| 1699 | |
| 1700 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1701 | ssh_packet_read_poll_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1702 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1703 | struct session_state *state = ssh->state; |
Ben Lindstrom | 3f58474 | 2002-06-23 21:49:25 +0000 | [diff] [blame] | 1704 | u_int reason, seqnr; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1705 | int r; |
| 1706 | u_char *msg; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1707 | |
Ben Lindstrom | 80c6d77 | 2001-06-05 21:09:18 +0000 | [diff] [blame] | 1708 | for (;;) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1709 | msg = NULL; |
Ben Lindstrom | 80c6d77 | 2001-06-05 21:09:18 +0000 | [diff] [blame] | 1710 | if (compat20) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1711 | r = ssh_packet_read_poll2(ssh, typep, seqnr_p); |
| 1712 | if (r != 0) |
| 1713 | return r; |
| 1714 | if (*typep) { |
| 1715 | state->keep_alive_timeouts = 0; |
| 1716 | DBG(debug("received packet type %d", *typep)); |
Darren Tucker | 136e56f | 2008-06-08 12:49:30 +1000 | [diff] [blame] | 1717 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1718 | switch (*typep) { |
Damien Miller | 5ed3d57 | 2008-02-10 22:27:47 +1100 | [diff] [blame] | 1719 | case SSH2_MSG_IGNORE: |
Damien Miller | 58226f6 | 2008-03-07 18:33:30 +1100 | [diff] [blame] | 1720 | debug3("Received SSH2_MSG_IGNORE"); |
Damien Miller | 5ed3d57 | 2008-02-10 22:27:47 +1100 | [diff] [blame] | 1721 | break; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1722 | case SSH2_MSG_DEBUG: |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1723 | if ((r = sshpkt_get_u8(ssh, NULL)) != 0 || |
| 1724 | (r = sshpkt_get_string(ssh, &msg, NULL)) != 0 || |
| 1725 | (r = sshpkt_get_string(ssh, NULL, NULL)) != 0) { |
| 1726 | if (msg) |
| 1727 | free(msg); |
| 1728 | return r; |
| 1729 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1730 | debug("Remote: %.900s", msg); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1731 | free(msg); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1732 | break; |
| 1733 | case SSH2_MSG_DISCONNECT: |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1734 | if ((r = sshpkt_get_u32(ssh, &reason)) != 0 || |
| 1735 | (r = sshpkt_get_string(ssh, &msg, NULL)) != 0) |
| 1736 | return r; |
Damien Miller | d5edefd | 2013-04-23 15:21:39 +1000 | [diff] [blame] | 1737 | /* Ignore normal client exit notifications */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1738 | do_log2(ssh->state->server_side && |
Damien Miller | d5edefd | 2013-04-23 15:21:39 +1000 | [diff] [blame] | 1739 | reason == SSH2_DISCONNECT_BY_APPLICATION ? |
| 1740 | SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_ERROR, |
| 1741 | "Received disconnect from %s: %u: %.400s", |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1742 | ssh_remote_ipaddr(ssh), reason, msg); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1743 | free(msg); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1744 | return SSH_ERR_DISCONNECTED; |
Damien Miller | 659811f | 2002-01-22 23:23:11 +1100 | [diff] [blame] | 1745 | case SSH2_MSG_UNIMPLEMENTED: |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1746 | if ((r = sshpkt_get_u32(ssh, &seqnr)) != 0) |
| 1747 | return r; |
Ben Lindstrom | 3f58474 | 2002-06-23 21:49:25 +0000 | [diff] [blame] | 1748 | debug("Received SSH2_MSG_UNIMPLEMENTED for %u", |
| 1749 | seqnr); |
Damien Miller | 5ed3d57 | 2008-02-10 22:27:47 +1100 | [diff] [blame] | 1750 | break; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1751 | default: |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1752 | return 0; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 1753 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1754 | } else { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1755 | r = ssh_packet_read_poll1(ssh, typep); |
| 1756 | switch (*typep) { |
Damien Miller | ce98654 | 2013-07-18 16:12:44 +1000 | [diff] [blame] | 1757 | case SSH_MSG_NONE: |
| 1758 | return SSH_MSG_NONE; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1759 | case SSH_MSG_IGNORE: |
| 1760 | break; |
| 1761 | case SSH_MSG_DEBUG: |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1762 | if ((r = sshpkt_get_string(ssh, &msg, NULL)) != 0) |
| 1763 | return r; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1764 | debug("Remote: %.900s", msg); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1765 | free(msg); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1766 | break; |
| 1767 | case SSH_MSG_DISCONNECT: |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1768 | if ((r = sshpkt_get_string(ssh, &msg, NULL)) != 0) |
| 1769 | return r; |
Damien Miller | 894926e | 2013-02-12 11:03:58 +1100 | [diff] [blame] | 1770 | error("Received disconnect from %s: %.400s", |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1771 | ssh_remote_ipaddr(ssh), msg); |
| 1772 | free(msg); |
| 1773 | return SSH_ERR_DISCONNECTED; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1774 | default: |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1775 | DBG(debug("received packet type %d", *typep)); |
| 1776 | return 0; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 1777 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1778 | } |
| 1779 | } |
| 1780 | } |
| 1781 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1782 | /* |
| 1783 | * Buffers the given amount of input characters. This is intended to be used |
| 1784 | * together with packet_read_poll. |
| 1785 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1786 | |
| 1787 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1788 | ssh_packet_process_incoming(struct ssh *ssh, const char *buf, u_int len) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1789 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1790 | struct session_state *state = ssh->state; |
| 1791 | int r; |
| 1792 | |
| 1793 | if (state->packet_discard) { |
| 1794 | state->keep_alive_timeouts = 0; /* ?? */ |
| 1795 | if (len >= state->packet_discard) { |
| 1796 | if ((r = ssh_packet_stop_discard(ssh)) != 0) |
| 1797 | fatal("%s: %s", __func__, ssh_err(r)); |
| 1798 | cleanup_exit(255); |
| 1799 | } |
| 1800 | state->packet_discard -= len; |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 1801 | return; |
| 1802 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1803 | if ((r = sshbuf_put(ssh->state->input, buf, len)) != 0) |
| 1804 | fatal("%s: %s", __func__, ssh_err(r)); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1805 | } |
| 1806 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1807 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1808 | ssh_packet_remaining(struct ssh *ssh) |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1809 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1810 | return sshbuf_len(ssh->state->incoming_packet); |
Damien Miller | da108ec | 2010-08-31 22:36:39 +1000 | [diff] [blame] | 1811 | } |
| 1812 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1813 | /* |
| 1814 | * Sends a diagnostic message from the server to the client. This message |
| 1815 | * can be sent at any time (but not while constructing another message). The |
| 1816 | * message is printed immediately, but only if the client is being executed |
| 1817 | * in verbose mode. These messages are primarily intended to ease debugging |
| 1818 | * authentication problems. The length of the formatted message must not |
| 1819 | * exceed 1024 bytes. This will automatically call packet_write_wait. |
| 1820 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1821 | |
| 1822 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1823 | ssh_packet_send_debug(struct ssh *ssh, const char *fmt,...) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1824 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1825 | char buf[1024]; |
| 1826 | va_list args; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1827 | int r; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1828 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1829 | if (compat20 && (ssh->compat & SSH_BUG_DEBUG)) |
Ben Lindstrom | a14ee47 | 2000-12-07 01:24:58 +0000 | [diff] [blame] | 1830 | return; |
| 1831 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1832 | va_start(args, fmt); |
| 1833 | vsnprintf(buf, sizeof(buf), fmt, args); |
| 1834 | va_end(args); |
| 1835 | |
Damien Miller | 7c8af4f | 2000-05-01 08:24:07 +1000 | [diff] [blame] | 1836 | if (compat20) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1837 | if ((r = sshpkt_start(ssh, SSH2_MSG_DEBUG)) != 0 || |
| 1838 | (r = sshpkt_put_u8(ssh, 0)) != 0 || /* always display */ |
| 1839 | (r = sshpkt_put_cstring(ssh, buf)) != 0 || |
| 1840 | (r = sshpkt_put_cstring(ssh, "")) != 0 || |
| 1841 | (r = sshpkt_send(ssh)) != 0) |
| 1842 | fatal("%s: %s", __func__, ssh_err(r)); |
Damien Miller | 7c8af4f | 2000-05-01 08:24:07 +1000 | [diff] [blame] | 1843 | } else { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1844 | if ((r = sshpkt_start(ssh, SSH_MSG_DEBUG)) != 0 || |
| 1845 | (r = sshpkt_put_cstring(ssh, buf)) != 0 || |
| 1846 | (r = sshpkt_send(ssh)) != 0) |
| 1847 | fatal("%s: %s", __func__, ssh_err(r)); |
Damien Miller | 7c8af4f | 2000-05-01 08:24:07 +1000 | [diff] [blame] | 1848 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1849 | ssh_packet_write_wait(ssh); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1850 | } |
| 1851 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1852 | /* |
| 1853 | * Logs the error plus constructs and sends a disconnect packet, closes the |
| 1854 | * connection, and exits. This function never returns. The error message |
| 1855 | * should not contain a newline. The length of the formatted message must |
| 1856 | * not exceed 1024 bytes. |
| 1857 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1858 | |
| 1859 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1860 | ssh_packet_disconnect(struct ssh *ssh, const char *fmt,...) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1861 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1862 | char buf[1024]; |
| 1863 | va_list args; |
| 1864 | static int disconnecting = 0; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1865 | int r; |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 1866 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1867 | if (disconnecting) /* Guard against recursive invocations. */ |
| 1868 | fatal("packet_disconnect called recursively."); |
| 1869 | disconnecting = 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1870 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1871 | /* |
| 1872 | * Format the message. Note that the caller must make sure the |
| 1873 | * message is of limited size. |
| 1874 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1875 | va_start(args, fmt); |
| 1876 | vsnprintf(buf, sizeof(buf), fmt, args); |
| 1877 | va_end(args); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1878 | |
Ben Lindstrom | 9bda7ae | 2002-11-09 15:46:24 +0000 | [diff] [blame] | 1879 | /* Display the error locally */ |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1880 | logit("Disconnecting: %.100s", buf); |
Ben Lindstrom | 9bda7ae | 2002-11-09 15:46:24 +0000 | [diff] [blame] | 1881 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1882 | /* Send the disconnect message to the other side, and wait for it to get sent. */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1883 | if (compat20) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1884 | if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 || |
| 1885 | (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_PROTOCOL_ERROR)) != 0 || |
| 1886 | (r = sshpkt_put_cstring(ssh, buf)) != 0 || |
| 1887 | (r = sshpkt_put_cstring(ssh, "")) != 0 || |
| 1888 | (r = sshpkt_send(ssh)) != 0) |
| 1889 | fatal("%s: %s", __func__, ssh_err(r)); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1890 | } else { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1891 | if ((r = sshpkt_start(ssh, SSH_MSG_DISCONNECT)) != 0 || |
| 1892 | (r = sshpkt_put_cstring(ssh, buf)) != 0 || |
| 1893 | (r = sshpkt_send(ssh)) != 0) |
| 1894 | fatal("%s: %s", __func__, ssh_err(r)); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1895 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1896 | ssh_packet_write_wait(ssh); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1897 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1898 | /* Close the connection. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1899 | ssh_packet_close(ssh); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1900 | cleanup_exit(255); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1901 | } |
| 1902 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1903 | /* Checks if there is any buffered output, and tries to write some of the output. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1904 | |
| 1905 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1906 | ssh_packet_write_poll(struct ssh *ssh) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1907 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1908 | struct session_state *state = ssh->state; |
| 1909 | int len = sshbuf_len(state->output); |
| 1910 | int cont, r; |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 1911 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1912 | if (len > 0) { |
Darren Tucker | c5564e1 | 2009-06-21 18:53:53 +1000 | [diff] [blame] | 1913 | cont = 0; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1914 | len = roaming_write(state->connection_out, |
| 1915 | sshbuf_ptr(state->output), len, &cont); |
Damien Miller | d874fa5 | 2008-07-05 09:40:56 +1000 | [diff] [blame] | 1916 | if (len == -1) { |
Damien Miller | ea43742 | 2009-10-02 11:49:03 +1000 | [diff] [blame] | 1917 | if (errno == EINTR || errno == EAGAIN || |
| 1918 | errno == EWOULDBLOCK) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1919 | return; |
Damien Miller | d874fa5 | 2008-07-05 09:40:56 +1000 | [diff] [blame] | 1920 | fatal("Write failed: %.100s", strerror(errno)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1921 | } |
Darren Tucker | c5564e1 | 2009-06-21 18:53:53 +1000 | [diff] [blame] | 1922 | if (len == 0 && !cont) |
Damien Miller | d874fa5 | 2008-07-05 09:40:56 +1000 | [diff] [blame] | 1923 | fatal("Write connection closed"); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1924 | if ((r = sshbuf_consume(state->output, len)) != 0) |
| 1925 | fatal("%s: %s", __func__, ssh_err(r)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1926 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1927 | } |
| 1928 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1929 | /* |
| 1930 | * Calls packet_write_poll repeatedly until all pending output data has been |
| 1931 | * written. |
| 1932 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1933 | |
| 1934 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1935 | ssh_packet_write_wait(struct ssh *ssh) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1936 | { |
Ben Lindstrom | cb978aa | 2001-03-05 07:07:49 +0000 | [diff] [blame] | 1937 | fd_set *setp; |
Damien Miller | ce98654 | 2013-07-18 16:12:44 +1000 | [diff] [blame] | 1938 | int ret, ms_remain = 0; |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1939 | struct timeval start, timeout, *timeoutp = NULL; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1940 | struct session_state *state = ssh->state; |
Ben Lindstrom | cb978aa | 2001-03-05 07:07:49 +0000 | [diff] [blame] | 1941 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1942 | setp = (fd_set *)calloc(howmany(state->connection_out + 1, |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 1943 | NFDBITS), sizeof(fd_mask)); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1944 | if (setp == NULL) |
| 1945 | fatal("%s: calloc failed", __func__); |
| 1946 | ssh_packet_write_poll(ssh); |
| 1947 | while (ssh_packet_have_data_to_write(ssh)) { |
| 1948 | memset(setp, 0, howmany(state->connection_out + 1, |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 1949 | NFDBITS) * sizeof(fd_mask)); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1950 | FD_SET(state->connection_out, setp); |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1951 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1952 | if (state->packet_timeout_ms > 0) { |
| 1953 | ms_remain = state->packet_timeout_ms; |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1954 | timeoutp = &timeout; |
| 1955 | } |
| 1956 | for (;;) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1957 | if (state->packet_timeout_ms != -1) { |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1958 | ms_to_timeval(&timeout, ms_remain); |
| 1959 | gettimeofday(&start, NULL); |
| 1960 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1961 | if ((ret = select(state->connection_out + 1, |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 1962 | NULL, setp, NULL, timeoutp)) >= 0) |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1963 | break; |
Damien Miller | ea43742 | 2009-10-02 11:49:03 +1000 | [diff] [blame] | 1964 | if (errno != EAGAIN && errno != EINTR && |
| 1965 | errno != EWOULDBLOCK) |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1966 | break; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1967 | if (state->packet_timeout_ms == -1) |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1968 | continue; |
| 1969 | ms_subtract_diff(&start, &ms_remain); |
| 1970 | if (ms_remain <= 0) { |
| 1971 | ret = 0; |
| 1972 | break; |
| 1973 | } |
| 1974 | } |
| 1975 | if (ret == 0) { |
| 1976 | logit("Connection to %.200s timed out while " |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1977 | "waiting to write", ssh_remote_ipaddr(ssh)); |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1978 | cleanup_exit(255); |
| 1979 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1980 | ssh_packet_write_poll(ssh); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1981 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1982 | free(setp); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1983 | } |
| 1984 | |
| 1985 | /* Returns true if there is buffered data to write to the connection. */ |
| 1986 | |
| 1987 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1988 | ssh_packet_have_data_to_write(struct ssh *ssh) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1989 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1990 | return sshbuf_len(ssh->state->output) != 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1991 | } |
| 1992 | |
| 1993 | /* Returns true if there is not too much data to write to the connection. */ |
| 1994 | |
| 1995 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1996 | ssh_packet_not_very_much_data_to_write(struct ssh *ssh) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1997 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 1998 | if (ssh->state->interactive_mode) |
| 1999 | return sshbuf_len(ssh->state->output) < 16384; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2000 | else |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2001 | return sshbuf_len(ssh->state->output) < 128 * 1024; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2002 | } |
| 2003 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2004 | void |
| 2005 | ssh_packet_set_tos(struct ssh *ssh, int tos) |
Ben Lindstrom | a743398 | 2002-12-23 02:41:41 +0000 | [diff] [blame] | 2006 | { |
Damien Miller | d2ac5d7 | 2011-05-15 08:43:13 +1000 | [diff] [blame] | 2007 | #ifndef IP_TOS_IS_BROKEN |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2008 | if (!ssh_packet_connection_is_on_socket(ssh)) |
Ben Lindstrom | a743398 | 2002-12-23 02:41:41 +0000 | [diff] [blame] | 2009 | return; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2010 | switch (ssh_packet_connection_af(ssh)) { |
Damien Miller | d2ac5d7 | 2011-05-15 08:43:13 +1000 | [diff] [blame] | 2011 | # ifdef IP_TOS |
| 2012 | case AF_INET: |
| 2013 | debug3("%s: set IP_TOS 0x%02x", __func__, tos); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2014 | if (setsockopt(ssh->state->connection_in, |
Damien Miller | d2ac5d7 | 2011-05-15 08:43:13 +1000 | [diff] [blame] | 2015 | IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0) |
| 2016 | error("setsockopt IP_TOS %d: %.100s:", |
| 2017 | tos, strerror(errno)); |
| 2018 | break; |
| 2019 | # endif /* IP_TOS */ |
| 2020 | # ifdef IPV6_TCLASS |
| 2021 | case AF_INET6: |
| 2022 | debug3("%s: set IPV6_TCLASS 0x%02x", __func__, tos); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2023 | if (setsockopt(ssh->state->connection_in, |
Damien Miller | d2ac5d7 | 2011-05-15 08:43:13 +1000 | [diff] [blame] | 2024 | IPPROTO_IPV6, IPV6_TCLASS, &tos, sizeof(tos)) < 0) |
| 2025 | error("setsockopt IPV6_TCLASS %d: %.100s:", |
| 2026 | tos, strerror(errno)); |
| 2027 | break; |
Damien Miller | d2ac5d7 | 2011-05-15 08:43:13 +1000 | [diff] [blame] | 2028 | # endif /* IPV6_TCLASS */ |
Damien Miller | 23f425b | 2011-05-15 08:58:15 +1000 | [diff] [blame] | 2029 | } |
Damien Miller | d2ac5d7 | 2011-05-15 08:43:13 +1000 | [diff] [blame] | 2030 | #endif /* IP_TOS_IS_BROKEN */ |
Damien Miller | 5924ceb | 2003-11-22 15:02:42 +1100 | [diff] [blame] | 2031 | } |
Ben Lindstrom | a743398 | 2002-12-23 02:41:41 +0000 | [diff] [blame] | 2032 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2033 | /* Informs that the current session is interactive. Sets IP flags for that. */ |
| 2034 | |
| 2035 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2036 | ssh_packet_set_interactive(struct ssh *ssh, int interactive, int qos_interactive, int qos_bulk) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2037 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2038 | struct session_state *state = ssh->state; |
| 2039 | |
| 2040 | if (state->set_interactive_called) |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 2041 | return; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2042 | state->set_interactive_called = 1; |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 2043 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2044 | /* Record that we are in interactive mode. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2045 | state->interactive_mode = interactive; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2046 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2047 | /* Only set socket options if using a socket. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2048 | if (!ssh_packet_connection_is_on_socket(ssh)) |
Ben Lindstrom | 93b6b77 | 2003-04-27 17:55:33 +0000 | [diff] [blame] | 2049 | return; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2050 | set_nodelay(state->connection_in); |
| 2051 | ssh_packet_set_tos(ssh, interactive ? qos_interactive : |
| 2052 | qos_bulk); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2053 | } |
| 2054 | |
| 2055 | /* Returns true if the current connection is interactive. */ |
| 2056 | |
| 2057 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2058 | ssh_packet_is_interactive(struct ssh *ssh) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2059 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2060 | return ssh->state->interactive_mode; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2061 | } |
Damien Miller | 6162d12 | 1999-11-21 13:23:52 +1100 | [diff] [blame] | 2062 | |
Darren Tucker | 1f8311c | 2004-05-13 16:39:33 +1000 | [diff] [blame] | 2063 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2064 | ssh_packet_set_maxsize(struct ssh *ssh, u_int s) |
Damien Miller | 6162d12 | 1999-11-21 13:23:52 +1100 | [diff] [blame] | 2065 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2066 | struct session_state *state = ssh->state; |
| 2067 | |
| 2068 | if (state->set_maxsize_called) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 2069 | logit("packet_set_maxsize: called twice: old %d new %d", |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2070 | state->max_packet_size, s); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2071 | return -1; |
| 2072 | } |
| 2073 | if (s < 4 * 1024 || s > 1024 * 1024) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 2074 | logit("packet_set_maxsize: bad size %d", s); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2075 | return -1; |
| 2076 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2077 | state->set_maxsize_called = 1; |
Ben Lindstrom | 16d45b3 | 2001-06-13 04:39:18 +0000 | [diff] [blame] | 2078 | debug("packet_set_maxsize: setting to %d", s); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2079 | state->max_packet_size = s; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2080 | return s; |
Damien Miller | 6162d12 | 1999-11-21 13:23:52 +1100 | [diff] [blame] | 2081 | } |
Ben Lindstrom | 5699c5f | 2001-03-05 06:17:49 +0000 | [diff] [blame] | 2082 | |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2083 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2084 | ssh_packet_inc_alive_timeouts(struct ssh *ssh) |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2085 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2086 | return ++ssh->state->keep_alive_timeouts; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2087 | } |
| 2088 | |
| 2089 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2090 | ssh_packet_set_alive_timeouts(struct ssh *ssh, int ka) |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2091 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2092 | ssh->state->keep_alive_timeouts = ka; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2093 | } |
| 2094 | |
| 2095 | u_int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2096 | ssh_packet_get_maxsize(struct ssh *ssh) |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2097 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2098 | return ssh->state->max_packet_size; |
Damien Miller | 9f64390 | 2001-11-12 11:02:52 +1100 | [diff] [blame] | 2099 | } |
| 2100 | |
Ben Lindstrom | 5699c5f | 2001-03-05 06:17:49 +0000 | [diff] [blame] | 2101 | /* |
| 2102 | * 9.2. Ignored Data Message |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 2103 | * |
Ben Lindstrom | 5699c5f | 2001-03-05 06:17:49 +0000 | [diff] [blame] | 2104 | * byte SSH_MSG_IGNORE |
| 2105 | * string data |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 2106 | * |
Ben Lindstrom | 5699c5f | 2001-03-05 06:17:49 +0000 | [diff] [blame] | 2107 | * All implementations MUST understand (and ignore) this message at any |
| 2108 | * time (after receiving the protocol version). No implementation is |
| 2109 | * required to send them. This message can be used as an additional |
| 2110 | * protection measure against advanced traffic analysis techniques. |
| 2111 | */ |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 2112 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2113 | ssh_packet_send_ignore(struct ssh *ssh, int nbytes) |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 2114 | { |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 2115 | u_int32_t rnd = 0; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2116 | int r, i; |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 2117 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2118 | if ((r = sshpkt_start(ssh, compat20 ? |
| 2119 | SSH2_MSG_IGNORE : SSH_MSG_IGNORE)) != 0 || |
| 2120 | (r = sshpkt_put_u32(ssh, nbytes)) != 0) |
| 2121 | fatal("%s: %s", __func__, ssh_err(r)); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 2122 | for (i = 0; i < nbytes; i++) { |
Ben Lindstrom | 5699c5f | 2001-03-05 06:17:49 +0000 | [diff] [blame] | 2123 | if (i % 4 == 0) |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 2124 | rnd = arc4random(); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2125 | if ((r = sshpkt_put_u8(ssh, (u_char)rnd & 0xff)) != 0) |
| 2126 | fatal("%s: %s", __func__, ssh_err(r)); |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 2127 | rnd >>= 8; |
Ben Lindstrom | 5699c5f | 2001-03-05 06:17:49 +0000 | [diff] [blame] | 2128 | } |
| 2129 | } |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 2130 | |
Darren Tucker | 1f8311c | 2004-05-13 16:39:33 +1000 | [diff] [blame] | 2131 | #define MAX_PACKETS (1U<<31) |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 2132 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2133 | ssh_packet_need_rekeying(struct ssh *ssh) |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 2134 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2135 | struct session_state *state = ssh->state; |
| 2136 | |
| 2137 | if (ssh->compat & SSH_BUG_NOREKEY) |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 2138 | return 0; |
| 2139 | return |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2140 | (state->p_send.packets > MAX_PACKETS) || |
| 2141 | (state->p_read.packets > MAX_PACKETS) || |
| 2142 | (state->max_blocks_out && |
| 2143 | (state->p_send.blocks > state->max_blocks_out)) || |
| 2144 | (state->max_blocks_in && |
| 2145 | (state->p_read.blocks > state->max_blocks_in)) || |
| 2146 | (state->rekey_interval != 0 && state->rekey_time + |
| 2147 | state->rekey_interval <= monotime()); |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 2148 | } |
| 2149 | |
| 2150 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2151 | ssh_packet_set_rekey_limits(struct ssh *ssh, u_int32_t bytes, time_t seconds) |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 2152 | { |
Darren Tucker | c53c2af | 2013-05-16 20:28:16 +1000 | [diff] [blame] | 2153 | debug3("rekey after %lld bytes, %d seconds", (long long)bytes, |
| 2154 | (int)seconds); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2155 | ssh->state->rekey_limit = bytes; |
| 2156 | ssh->state->rekey_interval = seconds; |
Darren Tucker | c53c2af | 2013-05-16 20:28:16 +1000 | [diff] [blame] | 2157 | /* |
| 2158 | * We set the time here so that in post-auth privsep slave we count |
| 2159 | * from the completion of the authentication. |
| 2160 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2161 | ssh->state->rekey_time = monotime(); |
Darren Tucker | c53c2af | 2013-05-16 20:28:16 +1000 | [diff] [blame] | 2162 | } |
| 2163 | |
| 2164 | time_t |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2165 | ssh_packet_get_rekey_timeout(struct ssh *ssh) |
Darren Tucker | c53c2af | 2013-05-16 20:28:16 +1000 | [diff] [blame] | 2166 | { |
| 2167 | time_t seconds; |
| 2168 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2169 | seconds = ssh->state->rekey_time + ssh->state->rekey_interval - |
Darren Tucker | b759c9c | 2013-06-02 07:46:16 +1000 | [diff] [blame] | 2170 | monotime(); |
Darren Tucker | 5f96f3b | 2013-05-16 20:29:28 +1000 | [diff] [blame] | 2171 | return (seconds <= 0 ? 1 : seconds); |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 2172 | } |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 2173 | |
| 2174 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2175 | ssh_packet_set_server(struct ssh *ssh) |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 2176 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2177 | ssh->state->server_side = 1; |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 2178 | } |
| 2179 | |
| 2180 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2181 | ssh_packet_set_authenticated(struct ssh *ssh) |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 2182 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2183 | ssh->state->after_authentication = 1; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2184 | } |
| 2185 | |
| 2186 | void * |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2187 | ssh_packet_get_input(struct ssh *ssh) |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2188 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2189 | return (void *)ssh->state->input; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2190 | } |
| 2191 | |
| 2192 | void * |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2193 | ssh_packet_get_output(struct ssh *ssh) |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2194 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2195 | return (void *)ssh->state->output; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2196 | } |
| 2197 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2198 | /* XXX TODO update roaming to new API (does not work anyway) */ |
Darren Tucker | e841eb0 | 2009-07-06 07:11:13 +1000 | [diff] [blame] | 2199 | /* |
| 2200 | * Save the state for the real connection, and use a separate state when |
| 2201 | * resuming a suspended connection. |
| 2202 | */ |
| 2203 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2204 | ssh_packet_backup_state(struct ssh *ssh, |
| 2205 | struct ssh *backup_state) |
Darren Tucker | e841eb0 | 2009-07-06 07:11:13 +1000 | [diff] [blame] | 2206 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2207 | struct ssh *tmp; |
Darren Tucker | e841eb0 | 2009-07-06 07:11:13 +1000 | [diff] [blame] | 2208 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2209 | close(ssh->state->connection_in); |
| 2210 | ssh->state->connection_in = -1; |
| 2211 | close(ssh->state->connection_out); |
| 2212 | ssh->state->connection_out = -1; |
Darren Tucker | e841eb0 | 2009-07-06 07:11:13 +1000 | [diff] [blame] | 2213 | if (backup_state) |
| 2214 | tmp = backup_state; |
| 2215 | else |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2216 | tmp = ssh_alloc_session_state(); |
| 2217 | backup_state = ssh; |
| 2218 | ssh = tmp; |
Darren Tucker | e841eb0 | 2009-07-06 07:11:13 +1000 | [diff] [blame] | 2219 | } |
| 2220 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2221 | /* XXX FIXME FIXME FIXME */ |
Darren Tucker | e841eb0 | 2009-07-06 07:11:13 +1000 | [diff] [blame] | 2222 | /* |
| 2223 | * Swap in the old state when resuming a connecion. |
| 2224 | */ |
| 2225 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2226 | ssh_packet_restore_state(struct ssh *ssh, |
| 2227 | struct ssh *backup_state) |
Darren Tucker | e841eb0 | 2009-07-06 07:11:13 +1000 | [diff] [blame] | 2228 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2229 | struct ssh *tmp; |
Darren Tucker | e841eb0 | 2009-07-06 07:11:13 +1000 | [diff] [blame] | 2230 | u_int len; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2231 | int r; |
Darren Tucker | e841eb0 | 2009-07-06 07:11:13 +1000 | [diff] [blame] | 2232 | |
| 2233 | tmp = backup_state; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2234 | backup_state = ssh; |
| 2235 | ssh = tmp; |
| 2236 | ssh->state->connection_in = backup_state->state->connection_in; |
| 2237 | backup_state->state->connection_in = -1; |
| 2238 | ssh->state->connection_out = backup_state->state->connection_out; |
| 2239 | backup_state->state->connection_out = -1; |
| 2240 | len = sshbuf_len(backup_state->state->input); |
Darren Tucker | e841eb0 | 2009-07-06 07:11:13 +1000 | [diff] [blame] | 2241 | if (len > 0) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2242 | if ((r = sshbuf_putb(ssh->state->input, |
| 2243 | backup_state->state->input)) != 0) |
| 2244 | fatal("%s: %s", __func__, ssh_err(r)); |
| 2245 | sshbuf_reset(backup_state->state->input); |
Darren Tucker | e841eb0 | 2009-07-06 07:11:13 +1000 | [diff] [blame] | 2246 | add_recv_bytes(len); |
| 2247 | } |
| 2248 | } |
Damien Miller | c31a0cd | 2014-05-15 14:37:39 +1000 | [diff] [blame] | 2249 | |
| 2250 | /* Reset after_authentication and reset compression in post-auth privsep */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2251 | static int |
| 2252 | ssh_packet_set_postauth(struct ssh *ssh) |
Damien Miller | c31a0cd | 2014-05-15 14:37:39 +1000 | [diff] [blame] | 2253 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2254 | struct sshcomp *comp; |
| 2255 | int r, mode; |
Damien Miller | c31a0cd | 2014-05-15 14:37:39 +1000 | [diff] [blame] | 2256 | |
| 2257 | debug("%s: called", __func__); |
| 2258 | /* This was set in net child, but is not visible in user child */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2259 | ssh->state->after_authentication = 1; |
| 2260 | ssh->state->rekeying = 0; |
Damien Miller | c31a0cd | 2014-05-15 14:37:39 +1000 | [diff] [blame] | 2261 | for (mode = 0; mode < MODE_MAX; mode++) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2262 | if (ssh->state->newkeys[mode] == NULL) |
Damien Miller | c31a0cd | 2014-05-15 14:37:39 +1000 | [diff] [blame] | 2263 | continue; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2264 | comp = &ssh->state->newkeys[mode]->comp; |
| 2265 | if (comp && comp->enabled && |
| 2266 | (r = ssh_packet_init_compression(ssh)) != 0) |
| 2267 | return r; |
Damien Miller | c31a0cd | 2014-05-15 14:37:39 +1000 | [diff] [blame] | 2268 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame^] | 2269 | return 0; |
| 2270 | } |
| 2271 | |
| 2272 | /* Packet state (de-)serialization for privsep */ |
| 2273 | |
| 2274 | /* turn kex into a blob for packet state serialization */ |
| 2275 | static int |
| 2276 | kex_to_blob(struct sshbuf *m, struct kex *kex) |
| 2277 | { |
| 2278 | int r; |
| 2279 | |
| 2280 | if ((r = sshbuf_put_string(m, kex->session_id, |
| 2281 | kex->session_id_len)) != 0 || |
| 2282 | (r = sshbuf_put_u32(m, kex->we_need)) != 0 || |
| 2283 | (r = sshbuf_put_u32(m, kex->hostkey_type)) != 0 || |
| 2284 | (r = sshbuf_put_u32(m, kex->kex_type)) != 0 || |
| 2285 | (r = sshbuf_put_stringb(m, kex->my)) != 0 || |
| 2286 | (r = sshbuf_put_stringb(m, kex->peer)) != 0 || |
| 2287 | (r = sshbuf_put_u32(m, kex->flags)) != 0 || |
| 2288 | (r = sshbuf_put_cstring(m, kex->client_version_string)) != 0 || |
| 2289 | (r = sshbuf_put_cstring(m, kex->server_version_string)) != 0) |
| 2290 | return r; |
| 2291 | return 0; |
| 2292 | } |
| 2293 | |
| 2294 | /* turn key exchange results into a blob for packet state serialization */ |
| 2295 | static int |
| 2296 | newkeys_to_blob(struct sshbuf *m, struct ssh *ssh, int mode) |
| 2297 | { |
| 2298 | struct sshbuf *b; |
| 2299 | struct sshcipher_ctx *cc; |
| 2300 | struct sshcomp *comp; |
| 2301 | struct sshenc *enc; |
| 2302 | struct sshmac *mac; |
| 2303 | struct newkeys *newkey; |
| 2304 | int r; |
| 2305 | |
| 2306 | if ((newkey = ssh->state->newkeys[mode]) == NULL) |
| 2307 | return SSH_ERR_INTERNAL_ERROR; |
| 2308 | enc = &newkey->enc; |
| 2309 | mac = &newkey->mac; |
| 2310 | comp = &newkey->comp; |
| 2311 | cc = (mode == MODE_OUT) ? &ssh->state->send_context : |
| 2312 | &ssh->state->receive_context; |
| 2313 | if ((r = cipher_get_keyiv(cc, enc->iv, enc->iv_len)) != 0) |
| 2314 | return r; |
| 2315 | if ((b = sshbuf_new()) == NULL) |
| 2316 | return SSH_ERR_ALLOC_FAIL; |
| 2317 | /* The cipher struct is constant and shared, you export pointer */ |
| 2318 | if ((r = sshbuf_put_cstring(b, enc->name)) != 0 || |
| 2319 | (r = sshbuf_put(b, &enc->cipher, sizeof(enc->cipher))) != 0 || |
| 2320 | (r = sshbuf_put_u32(b, enc->enabled)) != 0 || |
| 2321 | (r = sshbuf_put_u32(b, enc->block_size)) != 0 || |
| 2322 | (r = sshbuf_put_string(b, enc->key, enc->key_len)) != 0 || |
| 2323 | (r = sshbuf_put_string(b, enc->iv, enc->iv_len)) != 0) |
| 2324 | goto out; |
| 2325 | if (cipher_authlen(enc->cipher) == 0) { |
| 2326 | if ((r = sshbuf_put_cstring(b, mac->name)) != 0 || |
| 2327 | (r = sshbuf_put_u32(b, mac->enabled)) != 0 || |
| 2328 | (r = sshbuf_put_string(b, mac->key, mac->key_len)) != 0) |
| 2329 | goto out; |
| 2330 | } |
| 2331 | if ((r = sshbuf_put_u32(b, comp->type)) != 0 || |
| 2332 | (r = sshbuf_put_u32(b, comp->enabled)) != 0 || |
| 2333 | (r = sshbuf_put_cstring(b, comp->name)) != 0) |
| 2334 | goto out; |
| 2335 | r = sshbuf_put_stringb(m, b); |
| 2336 | out: |
| 2337 | if (b != NULL) |
| 2338 | sshbuf_free(b); |
| 2339 | return r; |
| 2340 | } |
| 2341 | |
| 2342 | /* serialize packet state into a blob */ |
| 2343 | int |
| 2344 | ssh_packet_get_state(struct ssh *ssh, struct sshbuf *m) |
| 2345 | { |
| 2346 | struct session_state *state = ssh->state; |
| 2347 | u_char *p; |
| 2348 | size_t slen, rlen; |
| 2349 | int r, ssh1cipher; |
| 2350 | |
| 2351 | if (!compat20) { |
| 2352 | ssh1cipher = cipher_get_number(state->receive_context.cipher); |
| 2353 | slen = cipher_get_keyiv_len(&state->send_context); |
| 2354 | rlen = cipher_get_keyiv_len(&state->receive_context); |
| 2355 | if ((r = sshbuf_put_u32(m, state->remote_protocol_flags)) != 0 || |
| 2356 | (r = sshbuf_put_u32(m, ssh1cipher)) != 0 || |
| 2357 | (r = sshbuf_put_string(m, state->ssh1_key, state->ssh1_keylen)) != 0 || |
| 2358 | (r = sshbuf_put_u32(m, slen)) != 0 || |
| 2359 | (r = sshbuf_reserve(m, slen, &p)) != 0 || |
| 2360 | (r = cipher_get_keyiv(&state->send_context, p, slen)) != 0 || |
| 2361 | (r = sshbuf_put_u32(m, rlen)) != 0 || |
| 2362 | (r = sshbuf_reserve(m, rlen, &p)) != 0 || |
| 2363 | (r = cipher_get_keyiv(&state->receive_context, p, rlen)) != 0) |
| 2364 | return r; |
| 2365 | } else { |
| 2366 | if ((r = kex_to_blob(m, ssh->kex)) != 0 || |
| 2367 | (r = newkeys_to_blob(m, ssh, MODE_OUT)) != 0 || |
| 2368 | (r = newkeys_to_blob(m, ssh, MODE_IN)) != 0 || |
| 2369 | (r = sshbuf_put_u32(m, state->p_send.seqnr)) != 0 || |
| 2370 | (r = sshbuf_put_u64(m, state->p_send.blocks)) != 0 || |
| 2371 | (r = sshbuf_put_u32(m, state->p_send.packets)) != 0 || |
| 2372 | (r = sshbuf_put_u64(m, state->p_send.bytes)) != 0 || |
| 2373 | (r = sshbuf_put_u32(m, state->p_read.seqnr)) != 0 || |
| 2374 | (r = sshbuf_put_u64(m, state->p_read.blocks)) != 0 || |
| 2375 | (r = sshbuf_put_u32(m, state->p_read.packets)) != 0 || |
| 2376 | (r = sshbuf_put_u64(m, state->p_read.bytes)) != 0) |
| 2377 | return r; |
| 2378 | } |
| 2379 | |
| 2380 | slen = cipher_get_keycontext(&state->send_context, NULL); |
| 2381 | rlen = cipher_get_keycontext(&state->receive_context, NULL); |
| 2382 | if ((r = sshbuf_put_u32(m, slen)) != 0 || |
| 2383 | (r = sshbuf_reserve(m, slen, &p)) != 0) |
| 2384 | return r; |
| 2385 | if (cipher_get_keycontext(&state->send_context, p) != (int)slen) |
| 2386 | return SSH_ERR_INTERNAL_ERROR; |
| 2387 | if ((r = sshbuf_put_u32(m, rlen)) != 0 || |
| 2388 | (r = sshbuf_reserve(m, rlen, &p)) != 0) |
| 2389 | return r; |
| 2390 | if (cipher_get_keycontext(&state->receive_context, p) != (int)rlen) |
| 2391 | return SSH_ERR_INTERNAL_ERROR; |
| 2392 | |
| 2393 | if ((r = ssh_packet_get_compress_state(m, ssh)) != 0 || |
| 2394 | (r = sshbuf_put_stringb(m, state->input)) != 0 || |
| 2395 | (r = sshbuf_put_stringb(m, state->output)) != 0) |
| 2396 | return r; |
| 2397 | |
| 2398 | if (compat20) { |
| 2399 | if ((r = sshbuf_put_u64(m, get_sent_bytes())) != 0 || |
| 2400 | (r = sshbuf_put_u64(m, get_recv_bytes())) != 0) |
| 2401 | return r; |
| 2402 | } |
| 2403 | return 0; |
| 2404 | } |
| 2405 | |
| 2406 | /* restore key exchange results from blob for packet state de-serialization */ |
| 2407 | static int |
| 2408 | newkeys_from_blob(struct sshbuf *m, struct ssh *ssh, int mode) |
| 2409 | { |
| 2410 | struct sshbuf *b = NULL; |
| 2411 | struct sshcomp *comp; |
| 2412 | struct sshenc *enc; |
| 2413 | struct sshmac *mac; |
| 2414 | struct newkeys *newkey = NULL; |
| 2415 | size_t keylen, ivlen, maclen; |
| 2416 | int r; |
| 2417 | |
| 2418 | if ((newkey = calloc(1, sizeof(*newkey))) == NULL) { |
| 2419 | r = SSH_ERR_ALLOC_FAIL; |
| 2420 | goto out; |
| 2421 | } |
| 2422 | if ((r = sshbuf_froms(m, &b)) != 0) |
| 2423 | goto out; |
| 2424 | #ifdef DEBUG_PK |
| 2425 | sshbuf_dump(b, stderr); |
| 2426 | #endif |
| 2427 | enc = &newkey->enc; |
| 2428 | mac = &newkey->mac; |
| 2429 | comp = &newkey->comp; |
| 2430 | |
| 2431 | if ((r = sshbuf_get_cstring(b, &enc->name, NULL)) != 0 || |
| 2432 | (r = sshbuf_get(b, &enc->cipher, sizeof(enc->cipher))) != 0 || |
| 2433 | (r = sshbuf_get_u32(b, (u_int *)&enc->enabled)) != 0 || |
| 2434 | (r = sshbuf_get_u32(b, &enc->block_size)) != 0 || |
| 2435 | (r = sshbuf_get_string(b, &enc->key, &keylen)) != 0 || |
| 2436 | (r = sshbuf_get_string(b, &enc->iv, &ivlen)) != 0) |
| 2437 | goto out; |
| 2438 | if (cipher_authlen(enc->cipher) == 0) { |
| 2439 | if ((r = sshbuf_get_cstring(b, &mac->name, NULL)) != 0) |
| 2440 | goto out; |
| 2441 | if ((r = mac_setup(mac, mac->name)) != 0) |
| 2442 | goto out; |
| 2443 | if ((r = sshbuf_get_u32(b, (u_int *)&mac->enabled)) != 0 || |
| 2444 | (r = sshbuf_get_string(b, &mac->key, &maclen)) != 0) |
| 2445 | goto out; |
| 2446 | if (maclen > mac->key_len) { |
| 2447 | r = SSH_ERR_INVALID_FORMAT; |
| 2448 | goto out; |
| 2449 | } |
| 2450 | mac->key_len = maclen; |
| 2451 | } |
| 2452 | if ((r = sshbuf_get_u32(b, &comp->type)) != 0 || |
| 2453 | (r = sshbuf_get_u32(b, (u_int *)&comp->enabled)) != 0 || |
| 2454 | (r = sshbuf_get_cstring(b, &comp->name, NULL)) != 0) |
| 2455 | goto out; |
| 2456 | if (enc->name == NULL || |
| 2457 | cipher_by_name(enc->name) != enc->cipher) { |
| 2458 | r = SSH_ERR_INVALID_FORMAT; |
| 2459 | goto out; |
| 2460 | } |
| 2461 | if (sshbuf_len(b) != 0) { |
| 2462 | r = SSH_ERR_INVALID_FORMAT; |
| 2463 | goto out; |
| 2464 | } |
| 2465 | enc->key_len = keylen; |
| 2466 | enc->iv_len = ivlen; |
| 2467 | ssh->kex->newkeys[mode] = newkey; |
| 2468 | newkey = NULL; |
| 2469 | r = 0; |
| 2470 | out: |
| 2471 | if (newkey != NULL) |
| 2472 | free(newkey); |
| 2473 | if (b != NULL) |
| 2474 | sshbuf_free(b); |
| 2475 | return r; |
| 2476 | } |
| 2477 | |
| 2478 | /* restore kex from blob for packet state de-serialization */ |
| 2479 | static int |
| 2480 | kex_from_blob(struct sshbuf *m, struct kex **kexp) |
| 2481 | { |
| 2482 | struct kex *kex; |
| 2483 | int r; |
| 2484 | |
| 2485 | if ((kex = calloc(1, sizeof(struct kex))) == NULL || |
| 2486 | (kex->my = sshbuf_new()) == NULL || |
| 2487 | (kex->peer = sshbuf_new()) == NULL) { |
| 2488 | r = SSH_ERR_ALLOC_FAIL; |
| 2489 | goto out; |
| 2490 | } |
| 2491 | if ((r = sshbuf_get_string(m, &kex->session_id, &kex->session_id_len)) != 0 || |
| 2492 | (r = sshbuf_get_u32(m, &kex->we_need)) != 0 || |
| 2493 | (r = sshbuf_get_u32(m, (u_int *)&kex->hostkey_type)) != 0 || |
| 2494 | (r = sshbuf_get_u32(m, &kex->kex_type)) != 0 || |
| 2495 | (r = sshbuf_get_stringb(m, kex->my)) != 0 || |
| 2496 | (r = sshbuf_get_stringb(m, kex->peer)) != 0 || |
| 2497 | (r = sshbuf_get_u32(m, &kex->flags)) != 0 || |
| 2498 | (r = sshbuf_get_cstring(m, &kex->client_version_string, NULL)) != 0 || |
| 2499 | (r = sshbuf_get_cstring(m, &kex->server_version_string, NULL)) != 0) |
| 2500 | goto out; |
| 2501 | kex->server = 1; |
| 2502 | kex->done = 1; |
| 2503 | r = 0; |
| 2504 | out: |
| 2505 | if (r != 0 || kexp == NULL) { |
| 2506 | if (kex != NULL) { |
| 2507 | if (kex->my != NULL) |
| 2508 | sshbuf_free(kex->my); |
| 2509 | if (kex->peer != NULL) |
| 2510 | sshbuf_free(kex->peer); |
| 2511 | free(kex); |
| 2512 | } |
| 2513 | if (kexp != NULL) |
| 2514 | *kexp = NULL; |
| 2515 | } else { |
| 2516 | *kexp = kex; |
| 2517 | } |
| 2518 | return r; |
| 2519 | } |
| 2520 | |
| 2521 | /* |
| 2522 | * Restore packet state from content of blob 'm' (de-serialization). |
| 2523 | * Note that 'm' will be partially consumed on parsing or any other errors. |
| 2524 | */ |
| 2525 | int |
| 2526 | ssh_packet_set_state(struct ssh *ssh, struct sshbuf *m) |
| 2527 | { |
| 2528 | struct session_state *state = ssh->state; |
| 2529 | const u_char *ssh1key, *ivin, *ivout, *keyin, *keyout, *input, *output; |
| 2530 | size_t ssh1keylen, rlen, slen, ilen, olen; |
| 2531 | int r; |
| 2532 | u_int ssh1cipher = 0; |
| 2533 | u_int64_t sent_bytes = 0, recv_bytes = 0; |
| 2534 | |
| 2535 | if (!compat20) { |
| 2536 | if ((r = sshbuf_get_u32(m, &state->remote_protocol_flags)) != 0 || |
| 2537 | (r = sshbuf_get_u32(m, &ssh1cipher)) != 0 || |
| 2538 | (r = sshbuf_get_string_direct(m, &ssh1key, &ssh1keylen)) != 0 || |
| 2539 | (r = sshbuf_get_string_direct(m, &ivout, &slen)) != 0 || |
| 2540 | (r = sshbuf_get_string_direct(m, &ivin, &rlen)) != 0) |
| 2541 | return r; |
| 2542 | if (ssh1cipher > INT_MAX) |
| 2543 | return SSH_ERR_KEY_UNKNOWN_CIPHER; |
| 2544 | ssh_packet_set_encryption_key(ssh, ssh1key, ssh1keylen, |
| 2545 | (int)ssh1cipher); |
| 2546 | if (cipher_get_keyiv_len(&state->send_context) != (int)slen || |
| 2547 | cipher_get_keyiv_len(&state->receive_context) != (int)rlen) |
| 2548 | return SSH_ERR_INVALID_FORMAT; |
| 2549 | if ((r = cipher_set_keyiv(&state->send_context, ivout)) != 0 || |
| 2550 | (r = cipher_set_keyiv(&state->receive_context, ivin)) != 0) |
| 2551 | return r; |
| 2552 | } else { |
| 2553 | if ((r = kex_from_blob(m, &ssh->kex)) != 0 || |
| 2554 | (r = newkeys_from_blob(m, ssh, MODE_OUT)) != 0 || |
| 2555 | (r = newkeys_from_blob(m, ssh, MODE_IN)) != 0 || |
| 2556 | (r = sshbuf_get_u32(m, &state->p_send.seqnr)) != 0 || |
| 2557 | (r = sshbuf_get_u64(m, &state->p_send.blocks)) != 0 || |
| 2558 | (r = sshbuf_get_u32(m, &state->p_send.packets)) != 0 || |
| 2559 | (r = sshbuf_get_u64(m, &state->p_send.bytes)) != 0 || |
| 2560 | (r = sshbuf_get_u32(m, &state->p_read.seqnr)) != 0 || |
| 2561 | (r = sshbuf_get_u64(m, &state->p_read.blocks)) != 0 || |
| 2562 | (r = sshbuf_get_u32(m, &state->p_read.packets)) != 0 || |
| 2563 | (r = sshbuf_get_u64(m, &state->p_read.bytes)) != 0) |
| 2564 | return r; |
| 2565 | /* XXX ssh_set_newkeys overrides p_read.packets? XXX */ |
| 2566 | if ((r = ssh_set_newkeys(ssh, MODE_IN)) != 0 || |
| 2567 | (r = ssh_set_newkeys(ssh, MODE_OUT)) != 0) |
| 2568 | return r; |
| 2569 | } |
| 2570 | if ((r = sshbuf_get_string_direct(m, &keyout, &slen)) != 0 || |
| 2571 | (r = sshbuf_get_string_direct(m, &keyin, &rlen)) != 0) |
| 2572 | return r; |
| 2573 | if (cipher_get_keycontext(&state->send_context, NULL) != (int)slen || |
| 2574 | cipher_get_keycontext(&state->receive_context, NULL) != (int)rlen) |
| 2575 | return SSH_ERR_INVALID_FORMAT; |
| 2576 | cipher_set_keycontext(&state->send_context, keyout); |
| 2577 | cipher_set_keycontext(&state->receive_context, keyin); |
| 2578 | |
| 2579 | if ((r = ssh_packet_set_compress_state(ssh, m)) != 0 || |
| 2580 | (r = ssh_packet_set_postauth(ssh)) != 0) |
| 2581 | return r; |
| 2582 | |
| 2583 | sshbuf_reset(state->input); |
| 2584 | sshbuf_reset(state->output); |
| 2585 | if ((r = sshbuf_get_string_direct(m, &input, &ilen)) != 0 || |
| 2586 | (r = sshbuf_get_string_direct(m, &output, &olen)) != 0 || |
| 2587 | (r = sshbuf_put(state->input, input, ilen)) != 0 || |
| 2588 | (r = sshbuf_put(state->output, output, olen)) != 0) |
| 2589 | return r; |
| 2590 | |
| 2591 | if (compat20) { |
| 2592 | if ((r = sshbuf_get_u64(m, &sent_bytes)) != 0 || |
| 2593 | (r = sshbuf_get_u64(m, &recv_bytes)) != 0) |
| 2594 | return r; |
| 2595 | roam_set_bytes(sent_bytes, recv_bytes); |
| 2596 | } |
| 2597 | if (sshbuf_len(m)) |
| 2598 | return SSH_ERR_INVALID_FORMAT; |
| 2599 | debug3("%s: done", __func__); |
| 2600 | return 0; |
| 2601 | } |
| 2602 | |
| 2603 | /* NEW API */ |
| 2604 | |
| 2605 | /* put data to the outgoing packet */ |
| 2606 | |
| 2607 | int |
| 2608 | sshpkt_put(struct ssh *ssh, const void *v, size_t len) |
| 2609 | { |
| 2610 | return sshbuf_put(ssh->state->outgoing_packet, v, len); |
| 2611 | } |
| 2612 | |
| 2613 | int |
| 2614 | sshpkt_putb(struct ssh *ssh, const struct sshbuf *b) |
| 2615 | { |
| 2616 | return sshbuf_putb(ssh->state->outgoing_packet, b); |
| 2617 | } |
| 2618 | |
| 2619 | int |
| 2620 | sshpkt_put_u8(struct ssh *ssh, u_char val) |
| 2621 | { |
| 2622 | return sshbuf_put_u8(ssh->state->outgoing_packet, val); |
| 2623 | } |
| 2624 | |
| 2625 | int |
| 2626 | sshpkt_put_u32(struct ssh *ssh, u_int32_t val) |
| 2627 | { |
| 2628 | return sshbuf_put_u32(ssh->state->outgoing_packet, val); |
| 2629 | } |
| 2630 | |
| 2631 | int |
| 2632 | sshpkt_put_u64(struct ssh *ssh, u_int64_t val) |
| 2633 | { |
| 2634 | return sshbuf_put_u64(ssh->state->outgoing_packet, val); |
| 2635 | } |
| 2636 | |
| 2637 | int |
| 2638 | sshpkt_put_string(struct ssh *ssh, const void *v, size_t len) |
| 2639 | { |
| 2640 | return sshbuf_put_string(ssh->state->outgoing_packet, v, len); |
| 2641 | } |
| 2642 | |
| 2643 | int |
| 2644 | sshpkt_put_cstring(struct ssh *ssh, const void *v) |
| 2645 | { |
| 2646 | return sshbuf_put_cstring(ssh->state->outgoing_packet, v); |
| 2647 | } |
| 2648 | |
| 2649 | int |
| 2650 | sshpkt_put_stringb(struct ssh *ssh, const struct sshbuf *v) |
| 2651 | { |
| 2652 | return sshbuf_put_stringb(ssh->state->outgoing_packet, v); |
| 2653 | } |
| 2654 | |
| 2655 | int |
| 2656 | sshpkt_put_ec(struct ssh *ssh, const EC_POINT *v, const EC_GROUP *g) |
| 2657 | { |
| 2658 | return sshbuf_put_ec(ssh->state->outgoing_packet, v, g); |
| 2659 | } |
| 2660 | |
| 2661 | int |
| 2662 | sshpkt_put_bignum1(struct ssh *ssh, const BIGNUM *v) |
| 2663 | { |
| 2664 | return sshbuf_put_bignum1(ssh->state->outgoing_packet, v); |
| 2665 | } |
| 2666 | |
| 2667 | int |
| 2668 | sshpkt_put_bignum2(struct ssh *ssh, const BIGNUM *v) |
| 2669 | { |
| 2670 | return sshbuf_put_bignum2(ssh->state->outgoing_packet, v); |
| 2671 | } |
| 2672 | |
| 2673 | /* fetch data from the incoming packet */ |
| 2674 | |
| 2675 | int |
| 2676 | sshpkt_get(struct ssh *ssh, void *valp, size_t len) |
| 2677 | { |
| 2678 | return sshbuf_get(ssh->state->incoming_packet, valp, len); |
| 2679 | } |
| 2680 | |
| 2681 | int |
| 2682 | sshpkt_get_u8(struct ssh *ssh, u_char *valp) |
| 2683 | { |
| 2684 | return sshbuf_get_u8(ssh->state->incoming_packet, valp); |
| 2685 | } |
| 2686 | |
| 2687 | int |
| 2688 | sshpkt_get_u32(struct ssh *ssh, u_int32_t *valp) |
| 2689 | { |
| 2690 | return sshbuf_get_u32(ssh->state->incoming_packet, valp); |
| 2691 | } |
| 2692 | |
| 2693 | int |
| 2694 | sshpkt_get_u64(struct ssh *ssh, u_int64_t *valp) |
| 2695 | { |
| 2696 | return sshbuf_get_u64(ssh->state->incoming_packet, valp); |
| 2697 | } |
| 2698 | |
| 2699 | int |
| 2700 | sshpkt_get_string(struct ssh *ssh, u_char **valp, size_t *lenp) |
| 2701 | { |
| 2702 | return sshbuf_get_string(ssh->state->incoming_packet, valp, lenp); |
| 2703 | } |
| 2704 | |
| 2705 | int |
| 2706 | sshpkt_get_string_direct(struct ssh *ssh, const u_char **valp, size_t *lenp) |
| 2707 | { |
| 2708 | return sshbuf_get_string_direct(ssh->state->incoming_packet, valp, lenp); |
| 2709 | } |
| 2710 | |
| 2711 | int |
| 2712 | sshpkt_get_cstring(struct ssh *ssh, char **valp, size_t *lenp) |
| 2713 | { |
| 2714 | return sshbuf_get_cstring(ssh->state->incoming_packet, valp, lenp); |
| 2715 | } |
| 2716 | |
| 2717 | int |
| 2718 | sshpkt_get_ec(struct ssh *ssh, EC_POINT *v, const EC_GROUP *g) |
| 2719 | { |
| 2720 | return sshbuf_get_ec(ssh->state->incoming_packet, v, g); |
| 2721 | } |
| 2722 | |
| 2723 | int |
| 2724 | sshpkt_get_bignum1(struct ssh *ssh, BIGNUM *v) |
| 2725 | { |
| 2726 | return sshbuf_get_bignum1(ssh->state->incoming_packet, v); |
| 2727 | } |
| 2728 | |
| 2729 | int |
| 2730 | sshpkt_get_bignum2(struct ssh *ssh, BIGNUM *v) |
| 2731 | { |
| 2732 | return sshbuf_get_bignum2(ssh->state->incoming_packet, v); |
| 2733 | } |
| 2734 | |
| 2735 | int |
| 2736 | sshpkt_get_end(struct ssh *ssh) |
| 2737 | { |
| 2738 | if (sshbuf_len(ssh->state->incoming_packet) > 0) |
| 2739 | return SSH_ERR_UNEXPECTED_TRAILING_DATA; |
| 2740 | return 0; |
| 2741 | } |
| 2742 | |
| 2743 | const u_char * |
| 2744 | sshpkt_ptr(struct ssh *ssh, size_t *lenp) |
| 2745 | { |
| 2746 | if (lenp != NULL) |
| 2747 | *lenp = sshbuf_len(ssh->state->incoming_packet); |
| 2748 | return sshbuf_ptr(ssh->state->incoming_packet); |
| 2749 | } |
| 2750 | |
| 2751 | /* start a new packet */ |
| 2752 | |
| 2753 | int |
| 2754 | sshpkt_start(struct ssh *ssh, u_char type) |
| 2755 | { |
| 2756 | u_char buf[9]; |
| 2757 | int len; |
| 2758 | |
| 2759 | DBG(debug("packet_start[%d]", type)); |
| 2760 | len = compat20 ? 6 : 9; |
| 2761 | memset(buf, 0, len - 1); |
| 2762 | buf[len - 1] = type; |
| 2763 | sshbuf_reset(ssh->state->outgoing_packet); |
| 2764 | return sshbuf_put(ssh->state->outgoing_packet, buf, len); |
| 2765 | } |
| 2766 | |
| 2767 | /* send it */ |
| 2768 | |
| 2769 | int |
| 2770 | sshpkt_send(struct ssh *ssh) |
| 2771 | { |
| 2772 | if (compat20) |
| 2773 | return ssh_packet_send2(ssh); |
| 2774 | else |
| 2775 | return ssh_packet_send1(ssh); |
| 2776 | } |
| 2777 | |
| 2778 | int |
| 2779 | sshpkt_disconnect(struct ssh *ssh, const char *fmt,...) |
| 2780 | { |
| 2781 | char buf[1024]; |
| 2782 | va_list args; |
| 2783 | int r; |
| 2784 | |
| 2785 | va_start(args, fmt); |
| 2786 | vsnprintf(buf, sizeof(buf), fmt, args); |
| 2787 | va_end(args); |
| 2788 | |
| 2789 | if (compat20) { |
| 2790 | if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 || |
| 2791 | (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_PROTOCOL_ERROR)) != 0 || |
| 2792 | (r = sshpkt_put_cstring(ssh, buf)) != 0 || |
| 2793 | (r = sshpkt_put_cstring(ssh, "")) != 0 || |
| 2794 | (r = sshpkt_send(ssh)) != 0) |
| 2795 | return r; |
| 2796 | } else { |
| 2797 | if ((r = sshpkt_start(ssh, SSH_MSG_DISCONNECT)) != 0 || |
| 2798 | (r = sshpkt_put_cstring(ssh, buf)) != 0 || |
| 2799 | (r = sshpkt_send(ssh)) != 0) |
| 2800 | return r; |
| 2801 | } |
| 2802 | return 0; |
| 2803 | } |
| 2804 | |
| 2805 | /* roundup current message to pad bytes */ |
| 2806 | int |
| 2807 | sshpkt_add_padding(struct ssh *ssh, u_char pad) |
| 2808 | { |
| 2809 | ssh->state->extra_pad = pad; |
| 2810 | return 0; |
Damien Miller | c31a0cd | 2014-05-15 14:37:39 +1000 | [diff] [blame] | 2811 | } |