dtucker@openbsd.org | 5696512 | 2019-04-18 07:32:56 +0000 | [diff] [blame] | 1 | /* $OpenBSD: packet.c,v 1.284 2019/04/18 07:32:57 dtucker 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" |
deraadt@openbsd.org | 9136ec1 | 2016-09-12 01:22:38 +0000 | [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 | 8ec8c3e | 2006-07-10 20:35:38 +1000 | [diff] [blame] | 44 | #include <sys/socket.h> |
Damien Miller | 9aec919 | 2006-08-05 10:57:45 +1000 | [diff] [blame] | 45 | #ifdef HAVE_SYS_TIME_H |
| 46 | # include <sys/time.h> |
| 47 | #endif |
Damien Miller | 8ec8c3e | 2006-07-10 20:35:38 +1000 | [diff] [blame] | 48 | |
Damien Miller | 8ec8c3e | 2006-07-10 20:35:38 +1000 | [diff] [blame] | 49 | #include <netinet/in.h> |
Damien Miller | 68f8e99 | 2006-03-15 11:24:12 +1100 | [diff] [blame] | 50 | #include <netinet/ip.h> |
Darren Tucker | dace233 | 2006-09-22 19:22:17 +1000 | [diff] [blame] | 51 | #include <arpa/inet.h> |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 52 | |
Darren Tucker | 3997249 | 2006-07-12 22:22:46 +1000 | [diff] [blame] | 53 | #include <errno.h> |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 54 | #include <netdb.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> |
deraadt@openbsd.org | 087266e | 2015-01-20 23:14:00 +0000 | [diff] [blame] | 60 | #include <limits.h> |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 61 | #include <poll.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 62 | #include <signal.h> |
Darren Tucker | c53c2af | 2013-05-16 20:28:16 +1000 | [diff] [blame] | 63 | #include <time.h> |
Darren Tucker | 5d19626 | 2006-07-12 22:15:16 +1000 | [diff] [blame] | 64 | |
Darren Tucker | c77bc73 | 2018-07-20 13:48:51 +1000 | [diff] [blame] | 65 | /* |
| 66 | * Explicitly include OpenSSL before zlib as some versions of OpenSSL have |
| 67 | * "free_func" in their headers, which zlib typedefs. |
| 68 | */ |
| 69 | #ifdef WITH_OPENSSL |
| 70 | # include <openssl/bn.h> |
| 71 | # include <openssl/evp.h> |
| 72 | # ifdef OPENSSL_HAS_ECC |
| 73 | # include <openssl/ec.h> |
| 74 | # endif |
| 75 | #endif |
| 76 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 77 | #include <zlib.h> |
| 78 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 79 | #include "xmalloc.h" |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 80 | #include "compat.h" |
| 81 | #include "ssh2.h" |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 82 | #include "cipher.h" |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 83 | #include "sshkey.h" |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 84 | #include "kex.h" |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 85 | #include "digest.h" |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 86 | #include "mac.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 87 | #include "log.h" |
| 88 | #include "canohost.h" |
Damien Miller | 4d00776 | 2002-02-05 11:52:54 +1100 | [diff] [blame] | 89 | #include "misc.h" |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 90 | #include "channels.h" |
Ben Lindstrom | 402c6cc | 2002-06-21 00:43:42 +0000 | [diff] [blame] | 91 | #include "ssh.h" |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 92 | #include "packet.h" |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 93 | #include "ssherr.h" |
| 94 | #include "sshbuf.h" |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 95 | |
| 96 | #ifdef PACKET_DEBUG |
| 97 | #define DBG(x) x |
| 98 | #else |
| 99 | #define DBG(x) |
| 100 | #endif |
| 101 | |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 102 | #define PACKET_MAX_SIZE (256 * 1024) |
| 103 | |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 104 | struct packet_state { |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 105 | u_int32_t seqnr; |
| 106 | u_int32_t packets; |
| 107 | u_int64_t blocks; |
Damien Miller | b61f3fc | 2008-07-11 17:36:48 +1000 | [diff] [blame] | 108 | u_int64_t bytes; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 109 | }; |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 110 | |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 111 | struct packet { |
| 112 | TAILQ_ENTRY(packet) next; |
| 113 | u_char type; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 114 | struct sshbuf *payload; |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 115 | }; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 116 | |
| 117 | struct session_state { |
| 118 | /* |
| 119 | * This variable contains the file descriptors used for |
| 120 | * communicating with the other side. connection_in is used for |
| 121 | * reading; connection_out for writing. These can be the same |
| 122 | * descriptor, in which case it is assumed to be a socket. |
| 123 | */ |
| 124 | int connection_in; |
| 125 | int connection_out; |
| 126 | |
| 127 | /* Protocol flags for the remote side. */ |
| 128 | u_int remote_protocol_flags; |
| 129 | |
| 130 | /* Encryption context for receiving data. Only used for decryption. */ |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 131 | struct sshcipher_ctx *receive_context; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 132 | |
| 133 | /* Encryption context for sending data. Only used for encryption. */ |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 134 | struct sshcipher_ctx *send_context; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 135 | |
| 136 | /* Buffer for raw input data from the socket. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 137 | struct sshbuf *input; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 138 | |
| 139 | /* Buffer for raw output data going to the socket. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 140 | struct sshbuf *output; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 141 | |
| 142 | /* Buffer for the partial outgoing packet being constructed. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 143 | struct sshbuf *outgoing_packet; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 144 | |
| 145 | /* Buffer for the incoming packet currently being processed. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 146 | struct sshbuf *incoming_packet; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 147 | |
| 148 | /* Scratch buffer for packet compression/decompression. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 149 | struct sshbuf *compression_buffer; |
| 150 | |
| 151 | /* Incoming/outgoing compression dictionaries */ |
| 152 | z_stream compression_in_stream; |
| 153 | z_stream compression_out_stream; |
| 154 | int compression_in_started; |
| 155 | int compression_out_started; |
| 156 | int compression_in_failures; |
| 157 | int compression_out_failures; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 158 | |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 159 | /* default maximum packet size */ |
| 160 | u_int max_packet_size; |
| 161 | |
| 162 | /* Flag indicating whether this module has been initialized. */ |
| 163 | int initialized; |
| 164 | |
| 165 | /* Set to true if the connection is interactive. */ |
| 166 | int interactive_mode; |
| 167 | |
| 168 | /* Set to true if we are the server side. */ |
| 169 | int server_side; |
| 170 | |
| 171 | /* Set to true if we are authenticated. */ |
| 172 | int after_authentication; |
| 173 | |
| 174 | int keep_alive_timeouts; |
| 175 | |
| 176 | /* The maximum time that we will wait to send or receive a packet */ |
| 177 | int packet_timeout_ms; |
| 178 | |
| 179 | /* Session key information for Encryption and MAC */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 180 | struct newkeys *newkeys[MODE_MAX]; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 181 | struct packet_state p_read, p_send; |
| 182 | |
Darren Tucker | c53c2af | 2013-05-16 20:28:16 +1000 | [diff] [blame] | 183 | /* Volume-based rekeying */ |
dtucker@openbsd.org | 921ff00 | 2016-01-29 02:54:45 +0000 | [diff] [blame] | 184 | u_int64_t max_blocks_in, max_blocks_out, rekey_limit; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 185 | |
Darren Tucker | c53c2af | 2013-05-16 20:28:16 +1000 | [diff] [blame] | 186 | /* Time-based rekeying */ |
markus@openbsd.org | 02db468 | 2015-02-13 18:57:00 +0000 | [diff] [blame] | 187 | u_int32_t rekey_interval; /* how often in seconds */ |
Darren Tucker | c53c2af | 2013-05-16 20:28:16 +1000 | [diff] [blame] | 188 | time_t rekey_time; /* time of last rekeying */ |
| 189 | |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 190 | /* roundup current message to extra_pad bytes */ |
| 191 | u_char extra_pad; |
| 192 | |
| 193 | /* XXX discard incoming data after MAC error */ |
| 194 | u_int packet_discard; |
markus@openbsd.org | b98a2a8 | 2016-07-18 11:35:33 +0000 | [diff] [blame] | 195 | size_t packet_discard_mac_already; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 196 | struct sshmac *packet_discard_mac; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 197 | |
| 198 | /* Used in packet_read_poll2() */ |
| 199 | u_int packlen; |
| 200 | |
Darren Tucker | 7b935c7 | 2009-06-21 18:59:36 +1000 | [diff] [blame] | 201 | /* Used in packet_send2 */ |
| 202 | int rekeying; |
| 203 | |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 204 | /* Used in ssh_packet_send_mux() */ |
| 205 | int mux; |
| 206 | |
Darren Tucker | 7b935c7 | 2009-06-21 18:59:36 +1000 | [diff] [blame] | 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 | |
djm@openbsd.org | 39af7b4 | 2016-10-11 21:47:45 +0000 | [diff] [blame] | 216 | /* Hook for fuzzing inbound packets */ |
| 217 | ssh_packet_hook_fn *hook_in; |
| 218 | void *hook_in_ctx; |
| 219 | |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 220 | TAILQ_HEAD(, packet) outgoing; |
| 221 | }; |
| 222 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 223 | struct ssh * |
| 224 | ssh_alloc_session_state(void) |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 225 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 226 | struct ssh *ssh = NULL; |
| 227 | struct session_state *state = NULL; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 228 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 229 | if ((ssh = calloc(1, sizeof(*ssh))) == NULL || |
| 230 | (state = calloc(1, sizeof(*state))) == NULL || |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 231 | (ssh->kex = kex_new()) == NULL || |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 232 | (state->input = sshbuf_new()) == NULL || |
| 233 | (state->output = sshbuf_new()) == NULL || |
| 234 | (state->outgoing_packet = sshbuf_new()) == NULL || |
| 235 | (state->incoming_packet = sshbuf_new()) == NULL) |
| 236 | goto fail; |
| 237 | TAILQ_INIT(&state->outgoing); |
markus@openbsd.org | f582f0e | 2015-01-19 20:30:23 +0000 | [diff] [blame] | 238 | TAILQ_INIT(&ssh->private_keys); |
| 239 | TAILQ_INIT(&ssh->public_keys); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 240 | state->connection_in = -1; |
| 241 | state->connection_out = -1; |
| 242 | state->max_packet_size = 32768; |
| 243 | state->packet_timeout_ms = -1; |
| 244 | state->p_send.packets = state->p_read.packets = 0; |
| 245 | state->initialized = 1; |
| 246 | /* |
| 247 | * ssh_packet_send2() needs to queue packets until |
| 248 | * we've done the initial key exchange. |
| 249 | */ |
| 250 | state->rekeying = 1; |
| 251 | ssh->state = state; |
| 252 | return ssh; |
| 253 | fail: |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 254 | if (ssh) { |
| 255 | kex_free(ssh->kex); |
| 256 | free(ssh); |
| 257 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 258 | if (state) { |
| 259 | sshbuf_free(state->input); |
| 260 | sshbuf_free(state->output); |
| 261 | sshbuf_free(state->incoming_packet); |
| 262 | sshbuf_free(state->outgoing_packet); |
| 263 | free(state); |
| 264 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 265 | return NULL; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 266 | } |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 267 | |
djm@openbsd.org | 39af7b4 | 2016-10-11 21:47:45 +0000 | [diff] [blame] | 268 | void |
| 269 | ssh_packet_set_input_hook(struct ssh *ssh, ssh_packet_hook_fn *hook, void *ctx) |
| 270 | { |
| 271 | ssh->state->hook_in = hook; |
| 272 | ssh->state->hook_in_ctx = ctx; |
| 273 | } |
| 274 | |
djm@openbsd.org | 19bcf2e | 2016-02-08 10:57:07 +0000 | [diff] [blame] | 275 | /* Returns nonzero if rekeying is in progress */ |
| 276 | int |
| 277 | ssh_packet_is_rekeying(struct ssh *ssh) |
| 278 | { |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 279 | return ssh->state->rekeying || ssh->kex->done == 0; |
djm@openbsd.org | 19bcf2e | 2016-02-08 10:57:07 +0000 | [diff] [blame] | 280 | } |
| 281 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 282 | /* |
naddy@openbsd.org | 768405f | 2017-05-03 21:08:09 +0000 | [diff] [blame] | 283 | * Sets the descriptors used for communication. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 284 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 285 | struct ssh * |
| 286 | 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] | 287 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 288 | struct session_state *state; |
| 289 | const struct sshcipher *none = cipher_by_name("none"); |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 290 | int r; |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 291 | |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 292 | if (none == NULL) { |
| 293 | error("%s: cannot load cipher 'none'", __func__); |
| 294 | return NULL; |
| 295 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 296 | if (ssh == NULL) |
| 297 | ssh = ssh_alloc_session_state(); |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 298 | if (ssh == NULL) { |
| 299 | error("%s: cound not allocate state", __func__); |
| 300 | return NULL; |
| 301 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 302 | state = ssh->state; |
| 303 | state->connection_in = fd_in; |
| 304 | state->connection_out = fd_out; |
| 305 | if ((r = cipher_init(&state->send_context, none, |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 306 | (const u_char *)"", 0, NULL, 0, CIPHER_ENCRYPT)) != 0 || |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 307 | (r = cipher_init(&state->receive_context, none, |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 308 | (const u_char *)"", 0, NULL, 0, CIPHER_DECRYPT)) != 0) { |
| 309 | error("%s: cipher_init failed: %s", __func__, ssh_err(r)); |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 310 | free(ssh); /* XXX need ssh_free_session_state? */ |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 311 | return NULL; |
| 312 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 313 | state->newkeys[MODE_IN] = state->newkeys[MODE_OUT] = NULL; |
djm@openbsd.org | d4c0295 | 2015-02-11 01:20:38 +0000 | [diff] [blame] | 314 | /* |
| 315 | * Cache the IP address of the remote connection for use in error |
| 316 | * messages that might be generated after the connection has closed. |
| 317 | */ |
| 318 | (void)ssh_remote_ipaddr(ssh); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 319 | return ssh; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 320 | } |
| 321 | |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 322 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 323 | ssh_packet_set_timeout(struct ssh *ssh, int timeout, int count) |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 324 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 325 | struct session_state *state = ssh->state; |
| 326 | |
Damien Miller | 8ed4de8 | 2011-12-19 10:52:50 +1100 | [diff] [blame] | 327 | if (timeout <= 0 || count <= 0) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 328 | state->packet_timeout_ms = -1; |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 329 | return; |
| 330 | } |
| 331 | if ((INT_MAX / 1000) / count < timeout) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 332 | state->packet_timeout_ms = INT_MAX; |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 333 | else |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 334 | state->packet_timeout_ms = timeout * count * 1000; |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 335 | } |
| 336 | |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 337 | void |
| 338 | ssh_packet_set_mux(struct ssh *ssh) |
| 339 | { |
| 340 | ssh->state->mux = 1; |
| 341 | ssh->state->rekeying = 0; |
| 342 | } |
| 343 | |
| 344 | int |
| 345 | ssh_packet_get_mux(struct ssh *ssh) |
| 346 | { |
| 347 | return ssh->state->mux; |
| 348 | } |
| 349 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 350 | int |
djm@openbsd.org | 07edd7e | 2017-02-03 23:03:33 +0000 | [diff] [blame] | 351 | ssh_packet_set_log_preamble(struct ssh *ssh, const char *fmt, ...) |
| 352 | { |
| 353 | va_list args; |
| 354 | int r; |
| 355 | |
| 356 | free(ssh->log_preamble); |
| 357 | if (fmt == NULL) |
| 358 | ssh->log_preamble = NULL; |
| 359 | else { |
| 360 | va_start(args, fmt); |
| 361 | r = vasprintf(&ssh->log_preamble, fmt, args); |
| 362 | va_end(args); |
| 363 | if (r < 0 || ssh->log_preamble == NULL) |
| 364 | return SSH_ERR_ALLOC_FAIL; |
| 365 | } |
| 366 | return 0; |
| 367 | } |
| 368 | |
| 369 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 370 | ssh_packet_stop_discard(struct ssh *ssh) |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 371 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 372 | struct session_state *state = ssh->state; |
| 373 | int r; |
| 374 | |
| 375 | if (state->packet_discard_mac) { |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 376 | char buf[1024]; |
markus@openbsd.org | b98a2a8 | 2016-07-18 11:35:33 +0000 | [diff] [blame] | 377 | size_t dlen = PACKET_MAX_SIZE; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 378 | |
markus@openbsd.org | b98a2a8 | 2016-07-18 11:35:33 +0000 | [diff] [blame] | 379 | if (dlen > state->packet_discard_mac_already) |
| 380 | dlen -= state->packet_discard_mac_already; |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 381 | memset(buf, 'a', sizeof(buf)); |
markus@openbsd.org | b98a2a8 | 2016-07-18 11:35:33 +0000 | [diff] [blame] | 382 | while (sshbuf_len(state->incoming_packet) < dlen) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 383 | if ((r = sshbuf_put(state->incoming_packet, buf, |
| 384 | sizeof(buf))) != 0) |
| 385 | return r; |
| 386 | (void) mac_compute(state->packet_discard_mac, |
| 387 | state->p_read.seqnr, |
markus@openbsd.org | b98a2a8 | 2016-07-18 11:35:33 +0000 | [diff] [blame] | 388 | sshbuf_ptr(state->incoming_packet), dlen, |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 389 | NULL, 0); |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 390 | } |
djm@openbsd.org | a4b9e0f | 2015-12-11 03:24:25 +0000 | [diff] [blame] | 391 | logit("Finished discarding for %.200s port %d", |
| 392 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh)); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 393 | return SSH_ERR_MAC_INVALID; |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 394 | } |
| 395 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 396 | static int |
| 397 | ssh_packet_start_discard(struct ssh *ssh, struct sshenc *enc, |
markus@openbsd.org | b98a2a8 | 2016-07-18 11:35:33 +0000 | [diff] [blame] | 398 | struct sshmac *mac, size_t mac_already, u_int discard) |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 399 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 400 | struct session_state *state = ssh->state; |
| 401 | int r; |
| 402 | |
| 403 | if (enc == NULL || !cipher_is_cbc(enc->cipher) || (mac && mac->etm)) { |
| 404 | if ((r = sshpkt_disconnect(ssh, "Packet corrupt")) != 0) |
| 405 | return r; |
| 406 | return SSH_ERR_MAC_INVALID; |
| 407 | } |
markus@openbsd.org | b98a2a8 | 2016-07-18 11:35:33 +0000 | [diff] [blame] | 408 | /* |
| 409 | * Record number of bytes over which the mac has already |
| 410 | * been computed in order to minimize timing attacks. |
| 411 | */ |
| 412 | if (mac && mac->enabled) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 413 | state->packet_discard_mac = mac; |
markus@openbsd.org | b98a2a8 | 2016-07-18 11:35:33 +0000 | [diff] [blame] | 414 | state->packet_discard_mac_already = mac_already; |
| 415 | } |
| 416 | if (sshbuf_len(state->input) >= discard) |
| 417 | return ssh_packet_stop_discard(ssh); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 418 | state->packet_discard = discard - sshbuf_len(state->input); |
| 419 | return 0; |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 420 | } |
| 421 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 422 | /* Returns 1 if remote host is connected via socket, 0 if not. */ |
| 423 | |
| 424 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 425 | ssh_packet_connection_is_on_socket(struct ssh *ssh) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 426 | { |
djm@openbsd.org | 854ae20 | 2018-06-01 04:05:29 +0000 | [diff] [blame] | 427 | struct session_state *state; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 428 | struct sockaddr_storage from, to; |
| 429 | socklen_t fromlen, tolen; |
| 430 | |
djm@openbsd.org | 854ae20 | 2018-06-01 04:05:29 +0000 | [diff] [blame] | 431 | if (ssh == NULL || ssh->state == NULL) |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 432 | return 0; |
| 433 | |
djm@openbsd.org | 854ae20 | 2018-06-01 04:05:29 +0000 | [diff] [blame] | 434 | state = ssh->state; |
| 435 | if (state->connection_in == -1 || state->connection_out == -1) |
| 436 | return 0; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 437 | /* 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] | 438 | if (state->connection_in == state->connection_out) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 439 | return 1; |
| 440 | fromlen = sizeof(from); |
| 441 | memset(&from, 0, sizeof(from)); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 442 | if (getpeername(state->connection_in, (struct sockaddr *)&from, |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 443 | &fromlen) < 0) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 444 | return 0; |
| 445 | tolen = sizeof(to); |
| 446 | memset(&to, 0, sizeof(to)); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 447 | if (getpeername(state->connection_out, (struct sockaddr *)&to, |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 448 | &tolen) < 0) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 449 | return 0; |
| 450 | if (fromlen != tolen || memcmp(&from, &to, fromlen) != 0) |
| 451 | return 0; |
| 452 | if (from.ss_family != AF_INET && from.ss_family != AF_INET6) |
| 453 | return 0; |
| 454 | return 1; |
| 455 | } |
| 456 | |
Ben Lindstrom | f6027d3 | 2002-03-22 01:42:04 +0000 | [diff] [blame] | 457 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 458 | 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] | 459 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 460 | if (ibytes) |
| 461 | *ibytes = ssh->state->p_read.bytes; |
| 462 | if (obytes) |
| 463 | *obytes = ssh->state->p_send.bytes; |
Ben Lindstrom | f6027d3 | 2002-03-22 01:42:04 +0000 | [diff] [blame] | 464 | } |
| 465 | |
| 466 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 467 | ssh_packet_connection_af(struct ssh *ssh) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 468 | { |
| 469 | struct sockaddr_storage to; |
Damien Miller | 6fe375d | 2000-01-23 09:38:00 +1100 | [diff] [blame] | 470 | socklen_t tolen = sizeof(to); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 471 | |
| 472 | memset(&to, 0, sizeof(to)); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 473 | if (getsockname(ssh->state->connection_out, (struct sockaddr *)&to, |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 474 | &tolen) < 0) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 475 | return 0; |
Damien Miller | aa100c5 | 2002-04-26 16:54:34 +1000 | [diff] [blame] | 476 | #ifdef IPV4_IN_IPV6 |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 477 | if (to.ss_family == AF_INET6 && |
Damien Miller | aa100c5 | 2002-04-26 16:54:34 +1000 | [diff] [blame] | 478 | IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&to)->sin6_addr)) |
Damien Miller | d2ac5d7 | 2011-05-15 08:43:13 +1000 | [diff] [blame] | 479 | return AF_INET; |
Damien Miller | aa100c5 | 2002-04-26 16:54:34 +1000 | [diff] [blame] | 480 | #endif |
Damien Miller | d2ac5d7 | 2011-05-15 08:43:13 +1000 | [diff] [blame] | 481 | return to.ss_family; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 482 | } |
| 483 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 484 | /* Sets the connection into non-blocking mode. */ |
| 485 | |
| 486 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 487 | ssh_packet_set_nonblocking(struct ssh *ssh) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 488 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 489 | /* Set the socket into non-blocking mode. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 490 | set_nonblock(ssh->state->connection_in); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 491 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 492 | if (ssh->state->connection_out != ssh->state->connection_in) |
| 493 | set_nonblock(ssh->state->connection_out); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 494 | } |
| 495 | |
| 496 | /* Returns the socket used for reading. */ |
| 497 | |
| 498 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 499 | ssh_packet_get_connection_in(struct ssh *ssh) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 500 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 501 | return ssh->state->connection_in; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 502 | } |
| 503 | |
| 504 | /* Returns the descriptor used for writing. */ |
| 505 | |
| 506 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 507 | ssh_packet_get_connection_out(struct ssh *ssh) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 508 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 509 | return ssh->state->connection_out; |
| 510 | } |
| 511 | |
| 512 | /* |
| 513 | * Returns the IP-address of the remote host as a string. The returned |
| 514 | * string must not be freed. |
| 515 | */ |
| 516 | |
| 517 | const char * |
| 518 | ssh_remote_ipaddr(struct ssh *ssh) |
| 519 | { |
djm@openbsd.org | 854ae20 | 2018-06-01 04:05:29 +0000 | [diff] [blame] | 520 | int sock; |
djm@openbsd.org | a4b9e0f | 2015-12-11 03:24:25 +0000 | [diff] [blame] | 521 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 522 | /* Check whether we have cached the ipaddr. */ |
djm@openbsd.org | a4b9e0f | 2015-12-11 03:24:25 +0000 | [diff] [blame] | 523 | if (ssh->remote_ipaddr == NULL) { |
| 524 | if (ssh_packet_connection_is_on_socket(ssh)) { |
djm@openbsd.org | 854ae20 | 2018-06-01 04:05:29 +0000 | [diff] [blame] | 525 | sock = ssh->state->connection_in; |
djm@openbsd.org | a4b9e0f | 2015-12-11 03:24:25 +0000 | [diff] [blame] | 526 | ssh->remote_ipaddr = get_peer_ipaddr(sock); |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 527 | ssh->remote_port = get_peer_port(sock); |
| 528 | ssh->local_ipaddr = get_local_ipaddr(sock); |
| 529 | ssh->local_port = get_local_port(sock); |
djm@openbsd.org | a4b9e0f | 2015-12-11 03:24:25 +0000 | [diff] [blame] | 530 | } else { |
| 531 | ssh->remote_ipaddr = strdup("UNKNOWN"); |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 532 | ssh->remote_port = 65535; |
| 533 | ssh->local_ipaddr = strdup("UNKNOWN"); |
| 534 | ssh->local_port = 65535; |
djm@openbsd.org | a4b9e0f | 2015-12-11 03:24:25 +0000 | [diff] [blame] | 535 | } |
| 536 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 537 | return ssh->remote_ipaddr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 538 | } |
| 539 | |
djm@openbsd.org | a4b9e0f | 2015-12-11 03:24:25 +0000 | [diff] [blame] | 540 | /* Returns the port number of the remote host. */ |
| 541 | |
| 542 | int |
| 543 | ssh_remote_port(struct ssh *ssh) |
| 544 | { |
| 545 | (void)ssh_remote_ipaddr(ssh); /* Will lookup and cache. */ |
| 546 | return ssh->remote_port; |
| 547 | } |
| 548 | |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 549 | /* |
| 550 | * Returns the IP-address of the local host as a string. The returned |
| 551 | * string must not be freed. |
| 552 | */ |
| 553 | |
| 554 | const char * |
| 555 | ssh_local_ipaddr(struct ssh *ssh) |
| 556 | { |
| 557 | (void)ssh_remote_ipaddr(ssh); /* Will lookup and cache. */ |
| 558 | return ssh->local_ipaddr; |
| 559 | } |
| 560 | |
| 561 | /* Returns the port number of the local host. */ |
| 562 | |
| 563 | int |
| 564 | ssh_local_port(struct ssh *ssh) |
| 565 | { |
| 566 | (void)ssh_remote_ipaddr(ssh); /* Will lookup and cache. */ |
| 567 | return ssh->local_port; |
| 568 | } |
| 569 | |
djm@openbsd.org | 35eb33f | 2017-10-25 00:17:08 +0000 | [diff] [blame] | 570 | /* Returns the routing domain of the input socket, or NULL if unavailable */ |
| 571 | const char * |
| 572 | ssh_packet_rdomain_in(struct ssh *ssh) |
| 573 | { |
| 574 | if (ssh->rdomain_in != NULL) |
| 575 | return ssh->rdomain_in; |
| 576 | if (!ssh_packet_connection_is_on_socket(ssh)) |
| 577 | return NULL; |
| 578 | ssh->rdomain_in = get_rdomain(ssh->state->connection_in); |
| 579 | return ssh->rdomain_in; |
| 580 | } |
| 581 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 582 | /* Closes the connection and clears and frees internal data structures. */ |
| 583 | |
markus@openbsd.org | 1e0cdf8 | 2017-05-31 08:09:45 +0000 | [diff] [blame] | 584 | static void |
| 585 | ssh_packet_close_internal(struct ssh *ssh, int do_close) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 586 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 587 | struct session_state *state = ssh->state; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 588 | u_int mode; |
| 589 | |
| 590 | if (!state->initialized) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 591 | return; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 592 | state->initialized = 0; |
markus@openbsd.org | 1e0cdf8 | 2017-05-31 08:09:45 +0000 | [diff] [blame] | 593 | if (do_close) { |
| 594 | if (state->connection_in == state->connection_out) { |
markus@openbsd.org | 1e0cdf8 | 2017-05-31 08:09:45 +0000 | [diff] [blame] | 595 | close(state->connection_out); |
| 596 | } else { |
| 597 | close(state->connection_in); |
| 598 | close(state->connection_out); |
| 599 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 600 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 601 | sshbuf_free(state->input); |
| 602 | sshbuf_free(state->output); |
| 603 | sshbuf_free(state->outgoing_packet); |
| 604 | sshbuf_free(state->incoming_packet); |
markus@openbsd.org | 1e0cdf8 | 2017-05-31 08:09:45 +0000 | [diff] [blame] | 605 | for (mode = 0; mode < MODE_MAX; mode++) { |
| 606 | kex_free_newkeys(state->newkeys[mode]); /* current keys */ |
| 607 | state->newkeys[mode] = NULL; |
| 608 | ssh_clear_newkeys(ssh, mode); /* next keys */ |
| 609 | } |
Damien Miller | 10479cc | 2018-04-10 10:19:02 +1000 | [diff] [blame] | 610 | /* compression state is in shared mem, so we can only release it once */ |
markus@openbsd.org | 1e0cdf8 | 2017-05-31 08:09:45 +0000 | [diff] [blame] | 611 | if (do_close && state->compression_buffer) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 612 | sshbuf_free(state->compression_buffer); |
| 613 | if (state->compression_out_started) { |
| 614 | z_streamp stream = &state->compression_out_stream; |
| 615 | debug("compress outgoing: " |
| 616 | "raw data %llu, compressed %llu, factor %.2f", |
| 617 | (unsigned long long)stream->total_in, |
| 618 | (unsigned long long)stream->total_out, |
| 619 | stream->total_in == 0 ? 0.0 : |
| 620 | (double) stream->total_out / stream->total_in); |
| 621 | if (state->compression_out_failures == 0) |
| 622 | deflateEnd(stream); |
| 623 | } |
| 624 | if (state->compression_in_started) { |
dtucker@openbsd.org | 550c053 | 2017-06-06 09:12:17 +0000 | [diff] [blame] | 625 | z_streamp stream = &state->compression_in_stream; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 626 | debug("compress incoming: " |
| 627 | "raw data %llu, compressed %llu, factor %.2f", |
| 628 | (unsigned long long)stream->total_out, |
| 629 | (unsigned long long)stream->total_in, |
| 630 | stream->total_out == 0 ? 0.0 : |
| 631 | (double) stream->total_in / stream->total_out); |
| 632 | if (state->compression_in_failures == 0) |
| 633 | inflateEnd(stream); |
| 634 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 635 | } |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 636 | cipher_free(state->send_context); |
| 637 | cipher_free(state->receive_context); |
| 638 | state->send_context = state->receive_context = NULL; |
markus@openbsd.org | 1e0cdf8 | 2017-05-31 08:09:45 +0000 | [diff] [blame] | 639 | if (do_close) { |
djm@openbsd.org | de2997a | 2018-07-16 03:09:13 +0000 | [diff] [blame] | 640 | free(ssh->local_ipaddr); |
| 641 | ssh->local_ipaddr = NULL; |
markus@openbsd.org | 1e0cdf8 | 2017-05-31 08:09:45 +0000 | [diff] [blame] | 642 | free(ssh->remote_ipaddr); |
| 643 | ssh->remote_ipaddr = NULL; |
| 644 | free(ssh->state); |
| 645 | ssh->state = NULL; |
| 646 | } |
| 647 | } |
| 648 | |
| 649 | void |
| 650 | ssh_packet_close(struct ssh *ssh) |
| 651 | { |
| 652 | ssh_packet_close_internal(ssh, 1); |
| 653 | } |
| 654 | |
| 655 | void |
| 656 | ssh_packet_clear_keys(struct ssh *ssh) |
| 657 | { |
| 658 | ssh_packet_close_internal(ssh, 0); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 659 | } |
| 660 | |
| 661 | /* Sets remote side protocol flags. */ |
| 662 | |
| 663 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 664 | ssh_packet_set_protocol_flags(struct ssh *ssh, u_int protocol_flags) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 665 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 666 | ssh->state->remote_protocol_flags = protocol_flags; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 667 | } |
| 668 | |
| 669 | /* Returns the remote protocol flags set earlier by the above function. */ |
| 670 | |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 671 | u_int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 672 | ssh_packet_get_protocol_flags(struct ssh *ssh) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 673 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 674 | return ssh->state->remote_protocol_flags; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 675 | } |
| 676 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 677 | /* |
| 678 | * Starts packet compression from the next packet on in both directions. |
| 679 | * Level is compression level 1 (fastest) - 9 (slow, best) as in gzip. |
| 680 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 681 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 682 | static int |
| 683 | ssh_packet_init_compression(struct ssh *ssh) |
Ben Lindstrom | fb50cdf | 2001-04-05 23:20:46 +0000 | [diff] [blame] | 684 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 685 | if (!ssh->state->compression_buffer && |
| 686 | ((ssh->state->compression_buffer = sshbuf_new()) == NULL)) |
| 687 | return SSH_ERR_ALLOC_FAIL; |
| 688 | return 0; |
| 689 | } |
| 690 | |
| 691 | static int |
| 692 | start_compression_out(struct ssh *ssh, int level) |
| 693 | { |
| 694 | if (level < 1 || level > 9) |
| 695 | return SSH_ERR_INVALID_ARGUMENT; |
| 696 | debug("Enabling compression at level %d.", level); |
| 697 | if (ssh->state->compression_out_started == 1) |
| 698 | deflateEnd(&ssh->state->compression_out_stream); |
| 699 | switch (deflateInit(&ssh->state->compression_out_stream, level)) { |
| 700 | case Z_OK: |
| 701 | ssh->state->compression_out_started = 1; |
| 702 | break; |
| 703 | case Z_MEM_ERROR: |
| 704 | return SSH_ERR_ALLOC_FAIL; |
| 705 | default: |
| 706 | return SSH_ERR_INTERNAL_ERROR; |
| 707 | } |
| 708 | return 0; |
| 709 | } |
| 710 | |
| 711 | static int |
| 712 | start_compression_in(struct ssh *ssh) |
| 713 | { |
| 714 | if (ssh->state->compression_in_started == 1) |
| 715 | inflateEnd(&ssh->state->compression_in_stream); |
| 716 | switch (inflateInit(&ssh->state->compression_in_stream)) { |
| 717 | case Z_OK: |
| 718 | ssh->state->compression_in_started = 1; |
| 719 | break; |
| 720 | case Z_MEM_ERROR: |
| 721 | return SSH_ERR_ALLOC_FAIL; |
| 722 | default: |
| 723 | return SSH_ERR_INTERNAL_ERROR; |
| 724 | } |
| 725 | return 0; |
| 726 | } |
| 727 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 728 | /* XXX remove need for separate compression buffer */ |
| 729 | static int |
| 730 | compress_buffer(struct ssh *ssh, struct sshbuf *in, struct sshbuf *out) |
| 731 | { |
| 732 | u_char buf[4096]; |
| 733 | int r, status; |
| 734 | |
| 735 | if (ssh->state->compression_out_started != 1) |
| 736 | return SSH_ERR_INTERNAL_ERROR; |
| 737 | |
| 738 | /* This case is not handled below. */ |
| 739 | if (sshbuf_len(in) == 0) |
| 740 | return 0; |
| 741 | |
| 742 | /* Input is the contents of the input buffer. */ |
| 743 | if ((ssh->state->compression_out_stream.next_in = |
| 744 | sshbuf_mutable_ptr(in)) == NULL) |
| 745 | return SSH_ERR_INTERNAL_ERROR; |
| 746 | ssh->state->compression_out_stream.avail_in = sshbuf_len(in); |
| 747 | |
| 748 | /* Loop compressing until deflate() returns with avail_out != 0. */ |
| 749 | do { |
| 750 | /* Set up fixed-size output buffer. */ |
| 751 | ssh->state->compression_out_stream.next_out = buf; |
| 752 | ssh->state->compression_out_stream.avail_out = sizeof(buf); |
| 753 | |
| 754 | /* Compress as much data into the buffer as possible. */ |
| 755 | status = deflate(&ssh->state->compression_out_stream, |
| 756 | Z_PARTIAL_FLUSH); |
| 757 | switch (status) { |
| 758 | case Z_MEM_ERROR: |
| 759 | return SSH_ERR_ALLOC_FAIL; |
| 760 | case Z_OK: |
| 761 | /* Append compressed data to output_buffer. */ |
| 762 | if ((r = sshbuf_put(out, buf, sizeof(buf) - |
| 763 | ssh->state->compression_out_stream.avail_out)) != 0) |
| 764 | return r; |
| 765 | break; |
| 766 | case Z_STREAM_ERROR: |
| 767 | default: |
| 768 | ssh->state->compression_out_failures++; |
| 769 | return SSH_ERR_INVALID_FORMAT; |
| 770 | } |
| 771 | } while (ssh->state->compression_out_stream.avail_out == 0); |
| 772 | return 0; |
| 773 | } |
| 774 | |
| 775 | static int |
| 776 | uncompress_buffer(struct ssh *ssh, struct sshbuf *in, struct sshbuf *out) |
| 777 | { |
| 778 | u_char buf[4096]; |
| 779 | int r, status; |
| 780 | |
| 781 | if (ssh->state->compression_in_started != 1) |
| 782 | return SSH_ERR_INTERNAL_ERROR; |
| 783 | |
| 784 | if ((ssh->state->compression_in_stream.next_in = |
| 785 | sshbuf_mutable_ptr(in)) == NULL) |
| 786 | return SSH_ERR_INTERNAL_ERROR; |
| 787 | ssh->state->compression_in_stream.avail_in = sshbuf_len(in); |
| 788 | |
| 789 | for (;;) { |
| 790 | /* Set up fixed-size output buffer. */ |
| 791 | ssh->state->compression_in_stream.next_out = buf; |
| 792 | ssh->state->compression_in_stream.avail_out = sizeof(buf); |
| 793 | |
| 794 | status = inflate(&ssh->state->compression_in_stream, |
| 795 | Z_PARTIAL_FLUSH); |
| 796 | switch (status) { |
| 797 | case Z_OK: |
| 798 | if ((r = sshbuf_put(out, buf, sizeof(buf) - |
| 799 | ssh->state->compression_in_stream.avail_out)) != 0) |
| 800 | return r; |
| 801 | break; |
| 802 | case Z_BUF_ERROR: |
| 803 | /* |
| 804 | * Comments in zlib.h say that we should keep calling |
| 805 | * inflate() until we get an error. This appears to |
| 806 | * be the error that we get. |
| 807 | */ |
| 808 | return 0; |
| 809 | case Z_DATA_ERROR: |
| 810 | return SSH_ERR_INVALID_FORMAT; |
| 811 | case Z_MEM_ERROR: |
| 812 | return SSH_ERR_ALLOC_FAIL; |
| 813 | case Z_STREAM_ERROR: |
| 814 | default: |
| 815 | ssh->state->compression_in_failures++; |
| 816 | return SSH_ERR_INTERNAL_ERROR; |
| 817 | } |
| 818 | } |
| 819 | /* NOTREACHED */ |
| 820 | } |
| 821 | |
markus@openbsd.org | 1e0cdf8 | 2017-05-31 08:09:45 +0000 | [diff] [blame] | 822 | void |
| 823 | ssh_clear_newkeys(struct ssh *ssh, int mode) |
| 824 | { |
djm@openbsd.org | 2d75d74 | 2017-06-01 06:16:43 +0000 | [diff] [blame] | 825 | if (ssh->kex && ssh->kex->newkeys[mode]) { |
markus@openbsd.org | 1e0cdf8 | 2017-05-31 08:09:45 +0000 | [diff] [blame] | 826 | kex_free_newkeys(ssh->kex->newkeys[mode]); |
| 827 | ssh->kex->newkeys[mode] = NULL; |
| 828 | } |
| 829 | } |
| 830 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 831 | int |
| 832 | ssh_set_newkeys(struct ssh *ssh, int mode) |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 833 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 834 | struct session_state *state = ssh->state; |
| 835 | struct sshenc *enc; |
| 836 | struct sshmac *mac; |
| 837 | struct sshcomp *comp; |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 838 | struct sshcipher_ctx **ccp; |
markus@openbsd.org | 06ce56b | 2016-09-06 09:22:56 +0000 | [diff] [blame] | 839 | struct packet_state *ps; |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 840 | u_int64_t *max_blocks; |
djm@openbsd.org | 2d75d74 | 2017-06-01 06:16:43 +0000 | [diff] [blame] | 841 | const char *wmsg; |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 842 | int r, crypt_type; |
djm@openbsd.org | e9552d6 | 2019-03-01 03:29:32 +0000 | [diff] [blame] | 843 | const char *dir = mode == MODE_OUT ? "out" : "in"; |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 844 | |
Ben Lindstrom | 064496f | 2002-12-23 02:04:22 +0000 | [diff] [blame] | 845 | debug2("set_newkeys: mode %d", mode); |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 846 | |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 847 | if (mode == MODE_OUT) { |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 848 | ccp = &state->send_context; |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 849 | crypt_type = CIPHER_ENCRYPT; |
markus@openbsd.org | 06ce56b | 2016-09-06 09:22:56 +0000 | [diff] [blame] | 850 | ps = &state->p_send; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 851 | max_blocks = &state->max_blocks_out; |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 852 | } else { |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 853 | ccp = &state->receive_context; |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 854 | crypt_type = CIPHER_DECRYPT; |
markus@openbsd.org | 06ce56b | 2016-09-06 09:22:56 +0000 | [diff] [blame] | 855 | ps = &state->p_read; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 856 | max_blocks = &state->max_blocks_in; |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 857 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 858 | if (state->newkeys[mode] != NULL) { |
djm@openbsd.org | e9552d6 | 2019-03-01 03:29:32 +0000 | [diff] [blame] | 859 | debug("%s: rekeying %s, input %llu bytes %llu blocks, " |
| 860 | "output %llu bytes %llu blocks", __func__, dir, |
markus@openbsd.org | 1e0cdf8 | 2017-05-31 08:09:45 +0000 | [diff] [blame] | 861 | (unsigned long long)state->p_read.bytes, |
| 862 | (unsigned long long)state->p_read.blocks, |
| 863 | (unsigned long long)state->p_send.bytes, |
| 864 | (unsigned long long)state->p_send.blocks); |
markus@openbsd.org | 1e0cdf8 | 2017-05-31 08:09:45 +0000 | [diff] [blame] | 865 | kex_free_newkeys(state->newkeys[mode]); |
| 866 | state->newkeys[mode] = NULL; |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 867 | } |
markus@openbsd.org | 06ce56b | 2016-09-06 09:22:56 +0000 | [diff] [blame] | 868 | /* note that both bytes and the seqnr are not reset */ |
| 869 | ps->packets = ps->blocks = 0; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 870 | /* move newkeys from kex to state */ |
| 871 | if ((state->newkeys[mode] = ssh->kex->newkeys[mode]) == NULL) |
| 872 | return SSH_ERR_INTERNAL_ERROR; |
| 873 | ssh->kex->newkeys[mode] = NULL; |
| 874 | enc = &state->newkeys[mode]->enc; |
| 875 | mac = &state->newkeys[mode]->mac; |
| 876 | comp = &state->newkeys[mode]->comp; |
| 877 | if (cipher_authlen(enc->cipher) == 0) { |
| 878 | if ((r = mac_init(mac)) != 0) |
| 879 | return r; |
| 880 | } |
| 881 | mac->enabled = 1; |
djm@openbsd.org | e9552d6 | 2019-03-01 03:29:32 +0000 | [diff] [blame] | 882 | DBG(debug("%s: cipher_init_context: %s", __func__, dir)); |
djm@openbsd.org | 8a81834 | 2019-01-04 03:23:00 +0000 | [diff] [blame] | 883 | cipher_free(*ccp); |
| 884 | *ccp = NULL; |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 885 | if ((r = cipher_init(ccp, enc->cipher, enc->key, enc->key_len, |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 886 | enc->iv, enc->iv_len, crypt_type)) != 0) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 887 | return r; |
| 888 | if (!state->cipher_warning_done && |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 889 | (wmsg = cipher_warning_message(*ccp)) != NULL) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 890 | error("Warning: %s", wmsg); |
| 891 | state->cipher_warning_done = 1; |
| 892 | } |
Ben Lindstrom | f6027d3 | 2002-03-22 01:42:04 +0000 | [diff] [blame] | 893 | /* Deleting the keys does not gain extra security */ |
Damien Miller | a5103f4 | 2014-02-04 11:20:14 +1100 | [diff] [blame] | 894 | /* explicit_bzero(enc->iv, enc->block_size); |
| 895 | explicit_bzero(enc->key, enc->key_len); |
| 896 | explicit_bzero(mac->key, mac->key_len); */ |
sf@openbsd.org | 168b46f | 2018-07-09 13:37:10 +0000 | [diff] [blame] | 897 | if ((comp->type == COMP_ZLIB || |
| 898 | (comp->type == COMP_DELAYED && |
| 899 | state->after_authentication)) && comp->enabled == 0) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 900 | if ((r = ssh_packet_init_compression(ssh)) < 0) |
| 901 | return r; |
| 902 | if (mode == MODE_OUT) { |
| 903 | if ((r = start_compression_out(ssh, 6)) != 0) |
| 904 | return r; |
| 905 | } else { |
| 906 | if ((r = start_compression_in(ssh)) != 0) |
| 907 | return r; |
| 908 | } |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 909 | comp->enabled = 1; |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 910 | } |
Darren Tucker | 81a0b37 | 2003-07-14 17:31:06 +1000 | [diff] [blame] | 911 | /* |
| 912 | * The 2^(blocksize*2) limit is too expensive for 3DES, |
djm@openbsd.org | acaf34f | 2017-05-07 23:12:57 +0000 | [diff] [blame] | 913 | * so enforce a 1GB limit for small blocksizes. |
dtucker@openbsd.org | ad05316 | 2017-06-09 04:40:04 +0000 | [diff] [blame] | 914 | * See RFC4344 section 3.2. |
Darren Tucker | 81a0b37 | 2003-07-14 17:31:06 +1000 | [diff] [blame] | 915 | */ |
| 916 | if (enc->block_size >= 16) |
| 917 | *max_blocks = (u_int64_t)1 << (enc->block_size*2); |
| 918 | else |
| 919 | *max_blocks = ((u_int64_t)1 << 30) / enc->block_size; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 920 | if (state->rekey_limit) |
deraadt@openbsd.org | 9136ec1 | 2016-09-12 01:22:38 +0000 | [diff] [blame] | 921 | *max_blocks = MINIMUM(*max_blocks, |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 922 | state->rekey_limit / enc->block_size); |
djm@openbsd.org | e9552d6 | 2019-03-01 03:29:32 +0000 | [diff] [blame] | 923 | debug("rekey %s after %llu blocks", dir, |
| 924 | (unsigned long long)*max_blocks); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 925 | return 0; |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 926 | } |
| 927 | |
djm@openbsd.org | 19bcf2e | 2016-02-08 10:57:07 +0000 | [diff] [blame] | 928 | #define MAX_PACKETS (1U<<31) |
| 929 | static int |
| 930 | ssh_packet_need_rekeying(struct ssh *ssh, u_int outbound_packet_len) |
| 931 | { |
| 932 | struct session_state *state = ssh->state; |
| 933 | u_int32_t out_blocks; |
| 934 | |
| 935 | /* XXX client can't cope with rekeying pre-auth */ |
| 936 | if (!state->after_authentication) |
| 937 | return 0; |
| 938 | |
| 939 | /* Haven't keyed yet or KEX in progress. */ |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 940 | if (ssh_packet_is_rekeying(ssh)) |
djm@openbsd.org | 19bcf2e | 2016-02-08 10:57:07 +0000 | [diff] [blame] | 941 | return 0; |
| 942 | |
| 943 | /* Peer can't rekey */ |
| 944 | if (ssh->compat & SSH_BUG_NOREKEY) |
| 945 | return 0; |
| 946 | |
| 947 | /* |
| 948 | * Permit one packet in or out per rekey - this allows us to |
| 949 | * make progress when rekey limits are very small. |
| 950 | */ |
| 951 | if (state->p_send.packets == 0 && state->p_read.packets == 0) |
| 952 | return 0; |
| 953 | |
| 954 | /* Time-based rekeying */ |
| 955 | if (state->rekey_interval != 0 && |
dtucker@openbsd.org | c998bf0 | 2017-02-03 02:56:00 +0000 | [diff] [blame] | 956 | (int64_t)state->rekey_time + state->rekey_interval <= monotime()) |
djm@openbsd.org | 19bcf2e | 2016-02-08 10:57:07 +0000 | [diff] [blame] | 957 | return 1; |
| 958 | |
dtucker@openbsd.org | ad05316 | 2017-06-09 04:40:04 +0000 | [diff] [blame] | 959 | /* |
| 960 | * Always rekey when MAX_PACKETS sent in either direction |
| 961 | * As per RFC4344 section 3.1 we do this after 2^31 packets. |
| 962 | */ |
djm@openbsd.org | 19bcf2e | 2016-02-08 10:57:07 +0000 | [diff] [blame] | 963 | if (state->p_send.packets > MAX_PACKETS || |
| 964 | state->p_read.packets > MAX_PACKETS) |
| 965 | return 1; |
| 966 | |
Damien Miller | 10479cc | 2018-04-10 10:19:02 +1000 | [diff] [blame] | 967 | /* Rekey after (cipher-specific) maximum blocks */ |
deraadt@openbsd.org | 9136ec1 | 2016-09-12 01:22:38 +0000 | [diff] [blame] | 968 | out_blocks = ROUNDUP(outbound_packet_len, |
djm@openbsd.org | 19bcf2e | 2016-02-08 10:57:07 +0000 | [diff] [blame] | 969 | state->newkeys[MODE_OUT]->enc.block_size); |
| 970 | return (state->max_blocks_out && |
| 971 | (state->p_send.blocks + out_blocks > state->max_blocks_out)) || |
| 972 | (state->max_blocks_in && |
| 973 | (state->p_read.blocks > state->max_blocks_in)); |
| 974 | } |
| 975 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 976 | /* |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 977 | * Delayed compression for SSH2 is enabled after authentication: |
Darren Tucker | f676c57 | 2006-08-05 18:51:08 +1000 | [diff] [blame] | 978 | * 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] | 979 | * and on the client side after a SSH2_MSG_USERAUTH_SUCCESS is received. |
| 980 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 981 | static int |
| 982 | ssh_packet_enable_delayed_compress(struct ssh *ssh) |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 983 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 984 | struct session_state *state = ssh->state; |
| 985 | struct sshcomp *comp = NULL; |
| 986 | int r, mode; |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 987 | |
| 988 | /* |
| 989 | * Remember that we are past the authentication step, so rekeying |
sf@openbsd.org | 168b46f | 2018-07-09 13:37:10 +0000 | [diff] [blame] | 990 | * with COMP_DELAYED will turn on compression immediately. |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 991 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 992 | state->after_authentication = 1; |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 993 | for (mode = 0; mode < MODE_MAX; mode++) { |
Darren Tucker | 4aa665b | 2006-09-21 13:00:25 +1000 | [diff] [blame] | 994 | /* protocol error: USERAUTH_SUCCESS received before NEWKEYS */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 995 | if (state->newkeys[mode] == NULL) |
Darren Tucker | 4aa665b | 2006-09-21 13:00:25 +1000 | [diff] [blame] | 996 | continue; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 997 | comp = &state->newkeys[mode]->comp; |
sf@openbsd.org | 168b46f | 2018-07-09 13:37:10 +0000 | [diff] [blame] | 998 | if (comp && !comp->enabled && comp->type == COMP_DELAYED) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 999 | if ((r = ssh_packet_init_compression(ssh)) != 0) |
| 1000 | return r; |
| 1001 | if (mode == MODE_OUT) { |
| 1002 | if ((r = start_compression_out(ssh, 6)) != 0) |
| 1003 | return r; |
| 1004 | } else { |
| 1005 | if ((r = start_compression_in(ssh)) != 0) |
| 1006 | return r; |
| 1007 | } |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 1008 | comp->enabled = 1; |
| 1009 | } |
| 1010 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1011 | return 0; |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 1012 | } |
| 1013 | |
djm@openbsd.org | 2813647 | 2016-01-29 05:46:01 +0000 | [diff] [blame] | 1014 | /* Used to mute debug logging for noisy packet types */ |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 1015 | int |
djm@openbsd.org | 2813647 | 2016-01-29 05:46:01 +0000 | [diff] [blame] | 1016 | ssh_packet_log_type(u_char type) |
| 1017 | { |
| 1018 | switch (type) { |
| 1019 | case SSH2_MSG_CHANNEL_DATA: |
| 1020 | case SSH2_MSG_CHANNEL_EXTENDED_DATA: |
| 1021 | case SSH2_MSG_CHANNEL_WINDOW_ADJUST: |
| 1022 | return 0; |
| 1023 | default: |
| 1024 | return 1; |
| 1025 | } |
| 1026 | } |
| 1027 | |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 1028 | /* |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1029 | * Finalize packet in SSH2 format (compress, mac, encrypt, enqueue) |
| 1030 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1031 | int |
| 1032 | ssh_packet_send2_wrapped(struct ssh *ssh) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1033 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1034 | struct session_state *state = ssh->state; |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 1035 | u_char type, *cp, macbuf[SSH_DIGEST_MAX_LENGTH]; |
djm@openbsd.org | eb999a4 | 2016-07-18 06:08:01 +0000 | [diff] [blame] | 1036 | u_char tmp, padlen, pad = 0; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1037 | u_int authlen = 0, aadlen = 0; |
| 1038 | u_int len; |
| 1039 | struct sshenc *enc = NULL; |
| 1040 | struct sshmac *mac = NULL; |
| 1041 | struct sshcomp *comp = NULL; |
| 1042 | int r, block_size; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1043 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1044 | if (state->newkeys[MODE_OUT] != NULL) { |
| 1045 | enc = &state->newkeys[MODE_OUT]->enc; |
| 1046 | mac = &state->newkeys[MODE_OUT]->mac; |
| 1047 | comp = &state->newkeys[MODE_OUT]->comp; |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 1048 | /* disable mac for authenticated encryption */ |
| 1049 | if ((authlen = cipher_authlen(enc->cipher)) != 0) |
| 1050 | mac = NULL; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1051 | } |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 1052 | block_size = enc ? enc->block_size : 8; |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 1053 | aadlen = (mac && mac->enabled && mac->etm) || authlen ? 4 : 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1054 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1055 | type = (sshbuf_ptr(state->outgoing_packet))[5]; |
djm@openbsd.org | 2813647 | 2016-01-29 05:46:01 +0000 | [diff] [blame] | 1056 | if (ssh_packet_log_type(type)) |
| 1057 | debug3("send packet: type %u", type); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1058 | #ifdef PACKET_DEBUG |
| 1059 | fprintf(stderr, "plain: "); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1060 | sshbuf_dump(state->outgoing_packet, stderr); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1061 | #endif |
| 1062 | |
| 1063 | if (comp && comp->enabled) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1064 | len = sshbuf_len(state->outgoing_packet); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1065 | /* skip header, compress only payload */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1066 | if ((r = sshbuf_consume(state->outgoing_packet, 5)) != 0) |
| 1067 | goto out; |
| 1068 | sshbuf_reset(state->compression_buffer); |
| 1069 | if ((r = compress_buffer(ssh, state->outgoing_packet, |
| 1070 | state->compression_buffer)) != 0) |
| 1071 | goto out; |
| 1072 | sshbuf_reset(state->outgoing_packet); |
| 1073 | if ((r = sshbuf_put(state->outgoing_packet, |
| 1074 | "\0\0\0\0\0", 5)) != 0 || |
| 1075 | (r = sshbuf_putb(state->outgoing_packet, |
| 1076 | state->compression_buffer)) != 0) |
| 1077 | goto out; |
| 1078 | DBG(debug("compression: raw %d compressed %zd", len, |
| 1079 | sshbuf_len(state->outgoing_packet))); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1080 | } |
| 1081 | |
| 1082 | /* sizeof (packet_len + pad_len + payload) */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1083 | len = sshbuf_len(state->outgoing_packet); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1084 | |
| 1085 | /* |
| 1086 | * calc size of padding, alloc space, get random data, |
| 1087 | * minimum padding is 4 bytes |
| 1088 | */ |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1089 | len -= aadlen; /* packet length is not encrypted for EtM modes */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1090 | padlen = block_size - (len % block_size); |
| 1091 | if (padlen < 4) |
| 1092 | padlen += block_size; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1093 | if (state->extra_pad) { |
djm@openbsd.org | eb999a4 | 2016-07-18 06:08:01 +0000 | [diff] [blame] | 1094 | tmp = state->extra_pad; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1095 | state->extra_pad = |
deraadt@openbsd.org | 9136ec1 | 2016-09-12 01:22:38 +0000 | [diff] [blame] | 1096 | ROUNDUP(state->extra_pad, block_size); |
djm@openbsd.org | eb999a4 | 2016-07-18 06:08:01 +0000 | [diff] [blame] | 1097 | /* check if roundup overflowed */ |
| 1098 | if (state->extra_pad < tmp) |
| 1099 | return SSH_ERR_INVALID_ARGUMENT; |
| 1100 | tmp = (len + padlen) % state->extra_pad; |
| 1101 | /* Check whether pad calculation below will underflow */ |
| 1102 | if (tmp > state->extra_pad) |
| 1103 | return SSH_ERR_INVALID_ARGUMENT; |
| 1104 | pad = state->extra_pad - tmp; |
Damien Miller | 2a32843 | 2014-04-20 13:24:01 +1000 | [diff] [blame] | 1105 | 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] | 1106 | __func__, pad, len, padlen, state->extra_pad)); |
djm@openbsd.org | eb999a4 | 2016-07-18 06:08:01 +0000 | [diff] [blame] | 1107 | tmp = padlen; |
Damien Miller | 9f64390 | 2001-11-12 11:02:52 +1100 | [diff] [blame] | 1108 | padlen += pad; |
djm@openbsd.org | eb999a4 | 2016-07-18 06:08:01 +0000 | [diff] [blame] | 1109 | /* Check whether padlen calculation overflowed */ |
| 1110 | if (padlen < tmp) |
| 1111 | return SSH_ERR_INVALID_ARGUMENT; /* overflow */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1112 | state->extra_pad = 0; |
Damien Miller | 9f64390 | 2001-11-12 11:02:52 +1100 | [diff] [blame] | 1113 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1114 | if ((r = sshbuf_reserve(state->outgoing_packet, padlen, &cp)) != 0) |
| 1115 | goto out; |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 1116 | if (enc && !cipher_ctx_is_plaintext(state->send_context)) { |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 1117 | /* random padding */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1118 | arc4random_buf(cp, padlen); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 1119 | } else { |
| 1120 | /* clear padding */ |
Damien Miller | a5103f4 | 2014-02-04 11:20:14 +1100 | [diff] [blame] | 1121 | explicit_bzero(cp, padlen); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1122 | } |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1123 | /* sizeof (packet_len + pad_len + payload + padding) */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1124 | len = sshbuf_len(state->outgoing_packet); |
| 1125 | cp = sshbuf_mutable_ptr(state->outgoing_packet); |
| 1126 | if (cp == NULL) { |
| 1127 | r = SSH_ERR_INTERNAL_ERROR; |
| 1128 | goto out; |
| 1129 | } |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1130 | /* packet_length includes payload, padding and padding length field */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1131 | POKE_U32(cp, len - 4); |
Ben Lindstrom | 4a7714a | 2002-02-26 18:04:38 +0000 | [diff] [blame] | 1132 | cp[4] = padlen; |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1133 | DBG(debug("send: len %d (includes padlen %d, aadlen %d)", |
| 1134 | len, padlen, aadlen)); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1135 | |
| 1136 | /* compute MAC over seqnr and packet(length fields, payload, padding) */ |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1137 | if (mac && mac->enabled && !mac->etm) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1138 | if ((r = mac_compute(mac, state->p_send.seqnr, |
| 1139 | sshbuf_ptr(state->outgoing_packet), len, |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 1140 | macbuf, sizeof(macbuf))) != 0) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1141 | goto out; |
| 1142 | DBG(debug("done calc MAC out #%d", state->p_send.seqnr)); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1143 | } |
| 1144 | /* encrypt packet and append to output buffer. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1145 | if ((r = sshbuf_reserve(state->output, |
| 1146 | sshbuf_len(state->outgoing_packet) + authlen, &cp)) != 0) |
| 1147 | goto out; |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 1148 | if ((r = cipher_crypt(state->send_context, state->p_send.seqnr, cp, |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1149 | sshbuf_ptr(state->outgoing_packet), |
| 1150 | len - aadlen, aadlen, authlen)) != 0) |
| 1151 | goto out; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1152 | /* append unencrypted MAC */ |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1153 | if (mac && mac->enabled) { |
| 1154 | if (mac->etm) { |
| 1155 | /* EtM: compute mac over aadlen + cipher text */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1156 | if ((r = mac_compute(mac, state->p_send.seqnr, |
| 1157 | cp, len, macbuf, sizeof(macbuf))) != 0) |
| 1158 | goto out; |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1159 | DBG(debug("done calc MAC(EtM) out #%d", |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1160 | state->p_send.seqnr)); |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1161 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1162 | if ((r = sshbuf_put(state->output, macbuf, mac->mac_len)) != 0) |
| 1163 | goto out; |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1164 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1165 | #ifdef PACKET_DEBUG |
| 1166 | fprintf(stderr, "encrypted: "); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1167 | sshbuf_dump(state->output, stderr); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1168 | #endif |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1169 | /* increment sequence number for outgoing packets */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1170 | if (++state->p_send.seqnr == 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1171 | logit("outgoing seqnr wraps around"); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1172 | if (++state->p_send.packets == 0) |
| 1173 | if (!(ssh->compat & SSH_BUG_NOREKEY)) |
| 1174 | return SSH_ERR_NEED_REKEY; |
| 1175 | state->p_send.blocks += len / block_size; |
| 1176 | state->p_send.bytes += len; |
| 1177 | sshbuf_reset(state->outgoing_packet); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1178 | |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 1179 | if (type == SSH2_MSG_NEWKEYS) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1180 | r = ssh_set_newkeys(ssh, MODE_OUT); |
| 1181 | else if (type == SSH2_MSG_USERAUTH_SUCCESS && state->server_side) |
| 1182 | r = ssh_packet_enable_delayed_compress(ssh); |
| 1183 | else |
| 1184 | r = 0; |
| 1185 | out: |
| 1186 | return r; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1187 | } |
| 1188 | |
djm@openbsd.org | 19bcf2e | 2016-02-08 10:57:07 +0000 | [diff] [blame] | 1189 | /* returns non-zero if the specified packet type is usec by KEX */ |
| 1190 | static int |
| 1191 | ssh_packet_type_is_kex(u_char type) |
| 1192 | { |
| 1193 | return |
| 1194 | type >= SSH2_MSG_TRANSPORT_MIN && |
| 1195 | type <= SSH2_MSG_TRANSPORT_MAX && |
| 1196 | type != SSH2_MSG_SERVICE_REQUEST && |
| 1197 | type != SSH2_MSG_SERVICE_ACCEPT && |
| 1198 | type != SSH2_MSG_EXT_INFO; |
| 1199 | } |
| 1200 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1201 | int |
| 1202 | ssh_packet_send2(struct ssh *ssh) |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1203 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1204 | struct session_state *state = ssh->state; |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1205 | struct packet *p; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1206 | u_char type; |
djm@openbsd.org | 19bcf2e | 2016-02-08 10:57:07 +0000 | [diff] [blame] | 1207 | int r, need_rekey; |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1208 | |
djm@openbsd.org | 19bcf2e | 2016-02-08 10:57:07 +0000 | [diff] [blame] | 1209 | if (sshbuf_len(state->outgoing_packet) < 6) |
| 1210 | return SSH_ERR_INTERNAL_ERROR; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1211 | type = sshbuf_ptr(state->outgoing_packet)[5]; |
djm@openbsd.org | 19bcf2e | 2016-02-08 10:57:07 +0000 | [diff] [blame] | 1212 | need_rekey = !ssh_packet_type_is_kex(type) && |
| 1213 | ssh_packet_need_rekeying(ssh, sshbuf_len(state->outgoing_packet)); |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1214 | |
djm@openbsd.org | 19bcf2e | 2016-02-08 10:57:07 +0000 | [diff] [blame] | 1215 | /* |
| 1216 | * During rekeying we can only send key exchange messages. |
| 1217 | * Queue everything else. |
| 1218 | */ |
| 1219 | if ((need_rekey || state->rekeying) && !ssh_packet_type_is_kex(type)) { |
| 1220 | if (need_rekey) |
| 1221 | debug3("%s: rekex triggered", __func__); |
| 1222 | debug("enqueue packet: %u", type); |
| 1223 | p = calloc(1, sizeof(*p)); |
| 1224 | if (p == NULL) |
| 1225 | return SSH_ERR_ALLOC_FAIL; |
| 1226 | p->type = type; |
| 1227 | p->payload = state->outgoing_packet; |
| 1228 | TAILQ_INSERT_TAIL(&state->outgoing, p, next); |
| 1229 | state->outgoing_packet = sshbuf_new(); |
| 1230 | if (state->outgoing_packet == NULL) |
| 1231 | return SSH_ERR_ALLOC_FAIL; |
| 1232 | if (need_rekey) { |
| 1233 | /* |
| 1234 | * This packet triggered a rekey, so send the |
| 1235 | * KEXINIT now. |
| 1236 | * NB. reenters this function via kex_start_rekex(). |
| 1237 | */ |
| 1238 | return kex_start_rekex(ssh); |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1239 | } |
djm@openbsd.org | 19bcf2e | 2016-02-08 10:57:07 +0000 | [diff] [blame] | 1240 | return 0; |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1241 | } |
| 1242 | |
| 1243 | /* rekeying starts with sending KEXINIT */ |
| 1244 | if (type == SSH2_MSG_KEXINIT) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1245 | state->rekeying = 1; |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1246 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1247 | if ((r = ssh_packet_send2_wrapped(ssh)) != 0) |
| 1248 | return r; |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1249 | |
| 1250 | /* after a NEWKEYS message we can send the complete queue */ |
| 1251 | if (type == SSH2_MSG_NEWKEYS) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1252 | state->rekeying = 0; |
| 1253 | state->rekey_time = monotime(); |
| 1254 | while ((p = TAILQ_FIRST(&state->outgoing))) { |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1255 | type = p->type; |
djm@openbsd.org | 19bcf2e | 2016-02-08 10:57:07 +0000 | [diff] [blame] | 1256 | /* |
| 1257 | * If this packet triggers a rekex, then skip the |
| 1258 | * remaining packets in the queue for now. |
| 1259 | * NB. re-enters this function via kex_start_rekex. |
| 1260 | */ |
| 1261 | if (ssh_packet_need_rekeying(ssh, |
| 1262 | sshbuf_len(p->payload))) { |
| 1263 | debug3("%s: queued packet triggered rekex", |
| 1264 | __func__); |
| 1265 | return kex_start_rekex(ssh); |
| 1266 | } |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1267 | debug("dequeue packet: %u", type); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1268 | sshbuf_free(state->outgoing_packet); |
| 1269 | state->outgoing_packet = p->payload; |
| 1270 | TAILQ_REMOVE(&state->outgoing, p, next); |
djm@openbsd.org | 19bcf2e | 2016-02-08 10:57:07 +0000 | [diff] [blame] | 1271 | memset(p, 0, sizeof(*p)); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1272 | free(p); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1273 | if ((r = ssh_packet_send2_wrapped(ssh)) != 0) |
| 1274 | return r; |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 1275 | } |
| 1276 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1277 | return 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1278 | } |
| 1279 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1280 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1281 | * Waits until a packet has been received, and returns its type. Note that |
| 1282 | * no other data is processed until this returns, so this function should not |
| 1283 | * be used during the interactive session. |
| 1284 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1285 | |
| 1286 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1287 | 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] | 1288 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1289 | struct session_state *state = ssh->state; |
markus@openbsd.org | a306863 | 2016-01-14 16:17:39 +0000 | [diff] [blame] | 1290 | int len, r, ms_remain; |
Ben Lindstrom | cb978aa | 2001-03-05 07:07:49 +0000 | [diff] [blame] | 1291 | fd_set *setp; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1292 | char buf[8192]; |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1293 | struct timeval timeout, start, *timeoutp = NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1294 | |
Darren Tucker | 99bb761 | 2008-06-13 22:02:50 +1000 | [diff] [blame] | 1295 | DBG(debug("packet_read()")); |
| 1296 | |
deraadt@openbsd.org | ce445b0 | 2015-08-20 22:32:42 +0000 | [diff] [blame] | 1297 | setp = calloc(howmany(state->connection_in + 1, |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 1298 | NFDBITS), sizeof(fd_mask)); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1299 | if (setp == NULL) |
| 1300 | return SSH_ERR_ALLOC_FAIL; |
Ben Lindstrom | cb978aa | 2001-03-05 07:07:49 +0000 | [diff] [blame] | 1301 | |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1302 | /* |
| 1303 | * Since we are blocking, ensure that all written packets have |
| 1304 | * been sent. |
| 1305 | */ |
markus@openbsd.org | 4daeb67 | 2015-03-24 20:10:08 +0000 | [diff] [blame] | 1306 | if ((r = ssh_packet_write_wait(ssh)) != 0) |
| 1307 | goto out; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1308 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1309 | /* Stay in the loop until we have received a complete packet. */ |
| 1310 | for (;;) { |
| 1311 | /* Try to read a packet from the buffer. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1312 | r = ssh_packet_read_poll_seqnr(ssh, typep, seqnr_p); |
| 1313 | if (r != 0) |
| 1314 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1315 | /* If we got a packet, return it. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1316 | if (*typep != SSH_MSG_NONE) |
| 1317 | break; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1318 | /* |
| 1319 | * Otherwise, wait for some data to arrive, add it to the |
| 1320 | * buffer, and try again. |
| 1321 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1322 | memset(setp, 0, howmany(state->connection_in + 1, |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 1323 | NFDBITS) * sizeof(fd_mask)); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1324 | FD_SET(state->connection_in, setp); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1325 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1326 | if (state->packet_timeout_ms > 0) { |
| 1327 | ms_remain = state->packet_timeout_ms; |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1328 | timeoutp = &timeout; |
| 1329 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1330 | /* Wait for some data to arrive. */ |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1331 | for (;;) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1332 | if (state->packet_timeout_ms != -1) { |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1333 | ms_to_timeval(&timeout, ms_remain); |
dtucker@openbsd.org@openbsd.org | 5db6fbf | 2017-11-25 06:46:22 +0000 | [diff] [blame] | 1334 | monotime_tv(&start); |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1335 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1336 | if ((r = select(state->connection_in + 1, setp, |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 1337 | NULL, NULL, timeoutp)) >= 0) |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1338 | break; |
Damien Miller | ea43742 | 2009-10-02 11:49:03 +1000 | [diff] [blame] | 1339 | if (errno != EAGAIN && errno != EINTR && |
dtucker@openbsd.org | 1da5934 | 2018-05-25 03:20:59 +0000 | [diff] [blame] | 1340 | errno != EWOULDBLOCK) { |
| 1341 | r = SSH_ERR_SYSTEM_ERROR; |
| 1342 | goto out; |
| 1343 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1344 | if (state->packet_timeout_ms == -1) |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1345 | continue; |
| 1346 | ms_subtract_diff(&start, &ms_remain); |
| 1347 | if (ms_remain <= 0) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1348 | r = 0; |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1349 | break; |
| 1350 | } |
| 1351 | } |
djm@openbsd.org | d7abb77 | 2017-02-28 06:10:08 +0000 | [diff] [blame] | 1352 | if (r == 0) { |
| 1353 | r = SSH_ERR_CONN_TIMEOUT; |
| 1354 | goto out; |
| 1355 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1356 | /* Read data from the socket. */ |
markus@openbsd.org | a306863 | 2016-01-14 16:17:39 +0000 | [diff] [blame] | 1357 | len = read(state->connection_in, buf, sizeof(buf)); |
markus@openbsd.org | 4daeb67 | 2015-03-24 20:10:08 +0000 | [diff] [blame] | 1358 | if (len == 0) { |
| 1359 | r = SSH_ERR_CONN_CLOSED; |
| 1360 | goto out; |
| 1361 | } |
| 1362 | if (len < 0) { |
| 1363 | r = SSH_ERR_SYSTEM_ERROR; |
| 1364 | goto out; |
| 1365 | } |
djm@openbsd.org | fae7bbe | 2015-01-28 21:15:47 +0000 | [diff] [blame] | 1366 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1367 | /* Append it to the buffer. */ |
djm@openbsd.org | fae7bbe | 2015-01-28 21:15:47 +0000 | [diff] [blame] | 1368 | if ((r = ssh_packet_process_incoming(ssh, buf, len)) != 0) |
markus@openbsd.org | 4daeb67 | 2015-03-24 20:10:08 +0000 | [diff] [blame] | 1369 | goto out; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1370 | } |
markus@openbsd.org | 4daeb67 | 2015-03-24 20:10:08 +0000 | [diff] [blame] | 1371 | out: |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1372 | free(setp); |
| 1373 | return r; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1374 | } |
| 1375 | |
Damien Miller | 278f907 | 2001-12-21 15:00:19 +1100 | [diff] [blame] | 1376 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1377 | ssh_packet_read(struct ssh *ssh) |
Damien Miller | 278f907 | 2001-12-21 15:00:19 +1100 | [diff] [blame] | 1378 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1379 | u_char type; |
| 1380 | int r; |
| 1381 | |
| 1382 | if ((r = ssh_packet_read_seqnr(ssh, &type, NULL)) != 0) |
| 1383 | fatal("%s: %s", __func__, ssh_err(r)); |
| 1384 | return type; |
Damien Miller | 278f907 | 2001-12-21 15:00:19 +1100 | [diff] [blame] | 1385 | } |
| 1386 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1387 | /* |
| 1388 | * Waits until a packet has been received, verifies that its type matches |
| 1389 | * that given, and gives a fatal error and exits if there is a mismatch. |
| 1390 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1391 | |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1392 | int |
| 1393 | ssh_packet_read_expect(struct ssh *ssh, u_int expected_type) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1394 | { |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1395 | int r; |
| 1396 | u_char type; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1397 | |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1398 | if ((r = ssh_packet_read_seqnr(ssh, &type, NULL)) != 0) |
| 1399 | return r; |
| 1400 | if (type != expected_type) { |
| 1401 | if ((r = sshpkt_disconnect(ssh, |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1402 | "Protocol error: expected packet type %d, got %d", |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1403 | expected_type, type)) != 0) |
| 1404 | return r; |
| 1405 | return SSH_ERR_PROTOCOL_ERROR; |
| 1406 | } |
| 1407 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1408 | } |
| 1409 | |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 1410 | static int |
| 1411 | ssh_packet_read_poll2_mux(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p) |
| 1412 | { |
| 1413 | struct session_state *state = ssh->state; |
| 1414 | const u_char *cp; |
| 1415 | size_t need; |
| 1416 | int r; |
| 1417 | |
| 1418 | if (ssh->kex) |
| 1419 | return SSH_ERR_INTERNAL_ERROR; |
| 1420 | *typep = SSH_MSG_NONE; |
| 1421 | cp = sshbuf_ptr(state->input); |
| 1422 | if (state->packlen == 0) { |
| 1423 | if (sshbuf_len(state->input) < 4 + 1) |
| 1424 | return 0; /* packet is incomplete */ |
| 1425 | state->packlen = PEEK_U32(cp); |
| 1426 | if (state->packlen < 4 + 1 || |
| 1427 | state->packlen > PACKET_MAX_SIZE) |
| 1428 | return SSH_ERR_MESSAGE_INCOMPLETE; |
| 1429 | } |
| 1430 | need = state->packlen + 4; |
| 1431 | if (sshbuf_len(state->input) < need) |
| 1432 | return 0; /* packet is incomplete */ |
| 1433 | sshbuf_reset(state->incoming_packet); |
| 1434 | if ((r = sshbuf_put(state->incoming_packet, cp + 4, |
| 1435 | state->packlen)) != 0 || |
| 1436 | (r = sshbuf_consume(state->input, need)) != 0 || |
| 1437 | (r = sshbuf_get_u8(state->incoming_packet, NULL)) != 0 || |
| 1438 | (r = sshbuf_get_u8(state->incoming_packet, typep)) != 0) |
| 1439 | return r; |
| 1440 | if (ssh_packet_log_type(*typep)) |
| 1441 | debug3("%s: type %u", __func__, *typep); |
| 1442 | /* sshbuf_dump(state->incoming_packet, stderr); */ |
| 1443 | /* reset for next packet */ |
| 1444 | state->packlen = 0; |
| 1445 | return r; |
| 1446 | } |
| 1447 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1448 | int |
| 1449 | 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] | 1450 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1451 | struct session_state *state = ssh->state; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1452 | u_int padlen, need; |
djm@openbsd.org | 6d31193 | 2016-07-08 03:44:42 +0000 | [diff] [blame] | 1453 | u_char *cp; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1454 | u_int maclen, aadlen = 0, authlen = 0, block_size; |
| 1455 | struct sshenc *enc = NULL; |
| 1456 | struct sshmac *mac = NULL; |
| 1457 | struct sshcomp *comp = NULL; |
markus@openbsd.org | 128343b | 2015-01-13 19:31:40 +0000 | [diff] [blame] | 1458 | int r; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1459 | |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 1460 | if (state->mux) |
| 1461 | return ssh_packet_read_poll2_mux(ssh, typep, seqnr_p); |
| 1462 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1463 | *typep = SSH_MSG_NONE; |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 1464 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1465 | if (state->packet_discard) |
| 1466 | return 0; |
| 1467 | |
| 1468 | if (state->newkeys[MODE_IN] != NULL) { |
| 1469 | enc = &state->newkeys[MODE_IN]->enc; |
| 1470 | mac = &state->newkeys[MODE_IN]->mac; |
| 1471 | comp = &state->newkeys[MODE_IN]->comp; |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 1472 | /* disable mac for authenticated encryption */ |
| 1473 | if ((authlen = cipher_authlen(enc->cipher)) != 0) |
| 1474 | mac = NULL; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1475 | } |
| 1476 | maclen = mac && mac->enabled ? mac->mac_len : 0; |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 1477 | block_size = enc ? enc->block_size : 8; |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 1478 | aadlen = (mac && mac->enabled && mac->etm) || authlen ? 4 : 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1479 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1480 | if (aadlen && state->packlen == 0) { |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 1481 | if (cipher_get_length(state->receive_context, |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1482 | &state->packlen, state->p_read.seqnr, |
| 1483 | sshbuf_ptr(state->input), sshbuf_len(state->input)) != 0) |
| 1484 | return 0; |
| 1485 | if (state->packlen < 1 + 4 || |
| 1486 | state->packlen > PACKET_MAX_SIZE) { |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1487 | #ifdef PACKET_DEBUG |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1488 | sshbuf_dump(state->input, stderr); |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1489 | #endif |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1490 | logit("Bad packet length %u.", state->packlen); |
| 1491 | if ((r = sshpkt_disconnect(ssh, "Packet corrupt")) != 0) |
| 1492 | return r; |
djm@openbsd.org | 2fecfd4 | 2015-11-08 21:59:11 +0000 | [diff] [blame] | 1493 | return SSH_ERR_CONN_CORRUPT; |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1494 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1495 | sshbuf_reset(state->incoming_packet); |
| 1496 | } else if (state->packlen == 0) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1497 | /* |
| 1498 | * check if input size is less than the cipher block size, |
| 1499 | * decrypt first block and extract length of incoming packet |
| 1500 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1501 | if (sshbuf_len(state->input) < block_size) |
| 1502 | return 0; |
| 1503 | sshbuf_reset(state->incoming_packet); |
| 1504 | if ((r = sshbuf_reserve(state->incoming_packet, block_size, |
| 1505 | &cp)) != 0) |
| 1506 | goto out; |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 1507 | if ((r = cipher_crypt(state->receive_context, |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1508 | state->p_send.seqnr, cp, sshbuf_ptr(state->input), |
| 1509 | block_size, 0, 0)) != 0) |
| 1510 | goto out; |
| 1511 | state->packlen = PEEK_U32(sshbuf_ptr(state->incoming_packet)); |
| 1512 | if (state->packlen < 1 + 4 || |
| 1513 | state->packlen > PACKET_MAX_SIZE) { |
Darren Tucker | a8151da | 2003-09-22 21:06:46 +1000 | [diff] [blame] | 1514 | #ifdef PACKET_DEBUG |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1515 | fprintf(stderr, "input: \n"); |
| 1516 | sshbuf_dump(state->input, stderr); |
| 1517 | fprintf(stderr, "incoming_packet: \n"); |
| 1518 | sshbuf_dump(state->incoming_packet, stderr); |
Darren Tucker | a8151da | 2003-09-22 21:06:46 +1000 | [diff] [blame] | 1519 | #endif |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1520 | logit("Bad packet length %u.", state->packlen); |
markus@openbsd.org | b98a2a8 | 2016-07-18 11:35:33 +0000 | [diff] [blame] | 1521 | return ssh_packet_start_discard(ssh, enc, mac, 0, |
| 1522 | PACKET_MAX_SIZE); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1523 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1524 | if ((r = sshbuf_consume(state->input, block_size)) != 0) |
| 1525 | goto out; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1526 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1527 | DBG(debug("input: packet len %u", state->packlen+4)); |
| 1528 | |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1529 | if (aadlen) { |
| 1530 | /* only the payload is encrypted */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1531 | need = state->packlen; |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1532 | } else { |
| 1533 | /* |
| 1534 | * the payload size and the payload are encrypted, but we |
| 1535 | * have a partial packet of block_size bytes |
| 1536 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1537 | need = 4 + state->packlen - block_size; |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1538 | } |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 1539 | DBG(debug("partial packet: block %d, need %d, maclen %d, authlen %d," |
| 1540 | " aadlen %d", block_size, need, maclen, authlen, aadlen)); |
Darren Tucker | 99d11a3 | 2008-12-01 21:40:48 +1100 | [diff] [blame] | 1541 | if (need % block_size != 0) { |
| 1542 | logit("padding error: need %d block %d mod %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1543 | need, block_size, need % block_size); |
markus@openbsd.org | b98a2a8 | 2016-07-18 11:35:33 +0000 | [diff] [blame] | 1544 | return ssh_packet_start_discard(ssh, enc, mac, 0, |
| 1545 | PACKET_MAX_SIZE - block_size); |
Darren Tucker | 99d11a3 | 2008-12-01 21:40:48 +1100 | [diff] [blame] | 1546 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1547 | /* |
| 1548 | * check if the entire packet has been received and |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1549 | * decrypt into incoming_packet: |
| 1550 | * 'aadlen' bytes are unencrypted, but authenticated. |
Damien Miller | 1d75abf | 2013-01-09 16:12:19 +1100 | [diff] [blame] | 1551 | * 'need' bytes are encrypted, followed by either |
| 1552 | * 'authlen' bytes of authentication tag or |
Damien Miller | af43a7a | 2012-12-12 10:46:31 +1100 | [diff] [blame] | 1553 | * 'maclen' bytes of message authentication code. |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1554 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1555 | if (sshbuf_len(state->input) < aadlen + need + authlen + maclen) |
djm@openbsd.org | 6d31193 | 2016-07-08 03:44:42 +0000 | [diff] [blame] | 1556 | return 0; /* packet is incomplete */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1557 | #ifdef PACKET_DEBUG |
| 1558 | fprintf(stderr, "read_poll enc/full: "); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1559 | sshbuf_dump(state->input, stderr); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1560 | #endif |
djm@openbsd.org | 6d31193 | 2016-07-08 03:44:42 +0000 | [diff] [blame] | 1561 | /* EtM: check mac over encrypted input */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1562 | if (mac && mac->enabled && mac->etm) { |
djm@openbsd.org | 6d31193 | 2016-07-08 03:44:42 +0000 | [diff] [blame] | 1563 | if ((r = mac_check(mac, state->p_read.seqnr, |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1564 | sshbuf_ptr(state->input), aadlen + need, |
djm@openbsd.org | 6d31193 | 2016-07-08 03:44:42 +0000 | [diff] [blame] | 1565 | sshbuf_ptr(state->input) + aadlen + need + authlen, |
| 1566 | maclen)) != 0) { |
| 1567 | if (r == SSH_ERR_MAC_INVALID) |
| 1568 | logit("Corrupted MAC on input."); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1569 | goto out; |
djm@openbsd.org | 6d31193 | 2016-07-08 03:44:42 +0000 | [diff] [blame] | 1570 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1571 | } |
| 1572 | if ((r = sshbuf_reserve(state->incoming_packet, aadlen + need, |
| 1573 | &cp)) != 0) |
| 1574 | goto out; |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 1575 | if ((r = cipher_crypt(state->receive_context, state->p_read.seqnr, cp, |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1576 | sshbuf_ptr(state->input), need, aadlen, authlen)) != 0) |
| 1577 | goto out; |
| 1578 | if ((r = sshbuf_consume(state->input, aadlen + need + authlen)) != 0) |
| 1579 | goto out; |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1580 | if (mac && mac->enabled) { |
djm@openbsd.org | 6d31193 | 2016-07-08 03:44:42 +0000 | [diff] [blame] | 1581 | /* Not EtM: check MAC over cleartext */ |
| 1582 | if (!mac->etm && (r = mac_check(mac, state->p_read.seqnr, |
| 1583 | sshbuf_ptr(state->incoming_packet), |
| 1584 | sshbuf_len(state->incoming_packet), |
| 1585 | sshbuf_ptr(state->input), maclen)) != 0) { |
| 1586 | if (r != SSH_ERR_MAC_INVALID) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1587 | goto out; |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 1588 | logit("Corrupted MAC on input."); |
markus@openbsd.org | 0fb1a61 | 2017-03-11 13:07:35 +0000 | [diff] [blame] | 1589 | if (need + block_size > PACKET_MAX_SIZE) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1590 | return SSH_ERR_INTERNAL_ERROR; |
| 1591 | return ssh_packet_start_discard(ssh, enc, mac, |
markus@openbsd.org | b98a2a8 | 2016-07-18 11:35:33 +0000 | [diff] [blame] | 1592 | sshbuf_len(state->incoming_packet), |
markus@openbsd.org | 0fb1a61 | 2017-03-11 13:07:35 +0000 | [diff] [blame] | 1593 | PACKET_MAX_SIZE - need - block_size); |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 1594 | } |
djm@openbsd.org | 6d31193 | 2016-07-08 03:44:42 +0000 | [diff] [blame] | 1595 | /* Remove MAC from input buffer */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1596 | DBG(debug("MAC #%d ok", state->p_read.seqnr)); |
| 1597 | if ((r = sshbuf_consume(state->input, mac->mac_len)) != 0) |
| 1598 | goto out; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1599 | } |
Damien Miller | 278f907 | 2001-12-21 15:00:19 +1100 | [diff] [blame] | 1600 | if (seqnr_p != NULL) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1601 | *seqnr_p = state->p_read.seqnr; |
| 1602 | if (++state->p_read.seqnr == 0) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1603 | logit("incoming seqnr wraps around"); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1604 | if (++state->p_read.packets == 0) |
| 1605 | if (!(ssh->compat & SSH_BUG_NOREKEY)) |
| 1606 | return SSH_ERR_NEED_REKEY; |
| 1607 | state->p_read.blocks += (state->packlen + 4) / block_size; |
| 1608 | state->p_read.bytes += state->packlen + 4; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1609 | |
| 1610 | /* get padlen */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1611 | padlen = sshbuf_ptr(state->incoming_packet)[4]; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1612 | DBG(debug("input: padlen %d", padlen)); |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1613 | if (padlen < 4) { |
| 1614 | if ((r = sshpkt_disconnect(ssh, |
| 1615 | "Corrupted padlen %d on input.", padlen)) != 0 || |
| 1616 | (r = ssh_packet_write_wait(ssh)) != 0) |
| 1617 | return r; |
| 1618 | return SSH_ERR_CONN_CORRUPT; |
| 1619 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1620 | |
| 1621 | /* skip packet size + padlen, discard padding */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1622 | if ((r = sshbuf_consume(state->incoming_packet, 4 + 1)) != 0 || |
| 1623 | ((r = sshbuf_consume_end(state->incoming_packet, padlen)) != 0)) |
| 1624 | goto out; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1625 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1626 | DBG(debug("input: len before de-compress %zd", |
| 1627 | sshbuf_len(state->incoming_packet))); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1628 | if (comp && comp->enabled) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1629 | sshbuf_reset(state->compression_buffer); |
| 1630 | if ((r = uncompress_buffer(ssh, state->incoming_packet, |
| 1631 | state->compression_buffer)) != 0) |
| 1632 | goto out; |
| 1633 | sshbuf_reset(state->incoming_packet); |
| 1634 | if ((r = sshbuf_putb(state->incoming_packet, |
| 1635 | state->compression_buffer)) != 0) |
| 1636 | goto out; |
| 1637 | DBG(debug("input: len after de-compress %zd", |
| 1638 | sshbuf_len(state->incoming_packet))); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1639 | } |
| 1640 | /* |
| 1641 | * get packet type, implies consume. |
| 1642 | * return length of payload (without type field) |
| 1643 | */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1644 | if ((r = sshbuf_get_u8(state->incoming_packet, typep)) != 0) |
| 1645 | goto out; |
djm@openbsd.org | 2813647 | 2016-01-29 05:46:01 +0000 | [diff] [blame] | 1646 | if (ssh_packet_log_type(*typep)) |
| 1647 | debug3("receive packet: type %u", *typep); |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1648 | if (*typep < SSH2_MSG_MIN || *typep >= SSH2_MSG_LOCAL_MIN) { |
| 1649 | if ((r = sshpkt_disconnect(ssh, |
| 1650 | "Invalid ssh2 packet type: %d", *typep)) != 0 || |
| 1651 | (r = ssh_packet_write_wait(ssh)) != 0) |
| 1652 | return r; |
| 1653 | return SSH_ERR_PROTOCOL_ERROR; |
| 1654 | } |
djm@openbsd.org | 39af7b4 | 2016-10-11 21:47:45 +0000 | [diff] [blame] | 1655 | if (state->hook_in != NULL && |
| 1656 | (r = state->hook_in(ssh, state->incoming_packet, typep, |
| 1657 | state->hook_in_ctx)) != 0) |
| 1658 | return r; |
markus@openbsd.org | 28652bc | 2016-09-19 19:02:19 +0000 | [diff] [blame] | 1659 | if (*typep == SSH2_MSG_USERAUTH_SUCCESS && !state->server_side) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1660 | r = ssh_packet_enable_delayed_compress(ssh); |
| 1661 | else |
| 1662 | r = 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1663 | #ifdef PACKET_DEBUG |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1664 | fprintf(stderr, "read/plain[%d]:\r\n", *typep); |
| 1665 | sshbuf_dump(state->incoming_packet, stderr); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1666 | #endif |
Ben Lindstrom | 80c6d77 | 2001-06-05 21:09:18 +0000 | [diff] [blame] | 1667 | /* reset for next packet */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1668 | state->packlen = 0; |
djm@openbsd.org | 19bcf2e | 2016-02-08 10:57:07 +0000 | [diff] [blame] | 1669 | |
| 1670 | /* do we need to rekey? */ |
| 1671 | if (ssh_packet_need_rekeying(ssh, 0)) { |
| 1672 | debug3("%s: rekex triggered", __func__); |
| 1673 | if ((r = kex_start_rekex(ssh)) != 0) |
| 1674 | return r; |
| 1675 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1676 | out: |
| 1677 | return r; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1678 | } |
| 1679 | |
| 1680 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1681 | 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] | 1682 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1683 | struct session_state *state = ssh->state; |
Ben Lindstrom | 3f58474 | 2002-06-23 21:49:25 +0000 | [diff] [blame] | 1684 | u_int reason, seqnr; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1685 | int r; |
| 1686 | u_char *msg; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1687 | |
Ben Lindstrom | 80c6d77 | 2001-06-05 21:09:18 +0000 | [diff] [blame] | 1688 | for (;;) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1689 | msg = NULL; |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame] | 1690 | r = ssh_packet_read_poll2(ssh, typep, seqnr_p); |
| 1691 | if (r != 0) |
| 1692 | return r; |
| 1693 | if (*typep) { |
| 1694 | state->keep_alive_timeouts = 0; |
| 1695 | DBG(debug("received packet type %d", *typep)); |
| 1696 | } |
| 1697 | switch (*typep) { |
| 1698 | case SSH2_MSG_IGNORE: |
| 1699 | debug3("Received SSH2_MSG_IGNORE"); |
| 1700 | break; |
| 1701 | case SSH2_MSG_DEBUG: |
| 1702 | if ((r = sshpkt_get_u8(ssh, NULL)) != 0 || |
| 1703 | (r = sshpkt_get_string(ssh, &msg, NULL)) != 0 || |
| 1704 | (r = sshpkt_get_string(ssh, NULL, NULL)) != 0) { |
| 1705 | free(msg); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1706 | return r; |
Darren Tucker | 136e56f | 2008-06-08 12:49:30 +1000 | [diff] [blame] | 1707 | } |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame] | 1708 | debug("Remote: %.900s", msg); |
| 1709 | free(msg); |
| 1710 | break; |
| 1711 | case SSH2_MSG_DISCONNECT: |
| 1712 | if ((r = sshpkt_get_u32(ssh, &reason)) != 0 || |
| 1713 | (r = sshpkt_get_string(ssh, &msg, NULL)) != 0) |
| 1714 | return r; |
| 1715 | /* Ignore normal client exit notifications */ |
| 1716 | do_log2(ssh->state->server_side && |
| 1717 | reason == SSH2_DISCONNECT_BY_APPLICATION ? |
| 1718 | SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_ERROR, |
| 1719 | "Received disconnect from %s port %d:" |
| 1720 | "%u: %.400s", ssh_remote_ipaddr(ssh), |
| 1721 | ssh_remote_port(ssh), reason, msg); |
| 1722 | free(msg); |
| 1723 | return SSH_ERR_DISCONNECTED; |
| 1724 | case SSH2_MSG_UNIMPLEMENTED: |
| 1725 | if ((r = sshpkt_get_u32(ssh, &seqnr)) != 0) |
| 1726 | return r; |
| 1727 | debug("Received SSH2_MSG_UNIMPLEMENTED for %u", |
| 1728 | seqnr); |
| 1729 | break; |
| 1730 | default: |
| 1731 | return 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1732 | } |
| 1733 | } |
| 1734 | } |
| 1735 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1736 | /* |
| 1737 | * Buffers the given amount of input characters. This is intended to be used |
| 1738 | * together with packet_read_poll. |
| 1739 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1740 | |
djm@openbsd.org | fae7bbe | 2015-01-28 21:15:47 +0000 | [diff] [blame] | 1741 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1742 | 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] | 1743 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1744 | struct session_state *state = ssh->state; |
| 1745 | int r; |
| 1746 | |
| 1747 | if (state->packet_discard) { |
| 1748 | state->keep_alive_timeouts = 0; /* ?? */ |
| 1749 | if (len >= state->packet_discard) { |
| 1750 | if ((r = ssh_packet_stop_discard(ssh)) != 0) |
djm@openbsd.org | fae7bbe | 2015-01-28 21:15:47 +0000 | [diff] [blame] | 1751 | return r; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1752 | } |
| 1753 | state->packet_discard -= len; |
djm@openbsd.org | fae7bbe | 2015-01-28 21:15:47 +0000 | [diff] [blame] | 1754 | return 0; |
Damien Miller | 13ae44c | 2009-01-28 16:38:41 +1100 | [diff] [blame] | 1755 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1756 | if ((r = sshbuf_put(ssh->state->input, buf, len)) != 0) |
djm@openbsd.org | fae7bbe | 2015-01-28 21:15:47 +0000 | [diff] [blame] | 1757 | return r; |
| 1758 | |
| 1759 | return 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1760 | } |
| 1761 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1762 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1763 | ssh_packet_remaining(struct ssh *ssh) |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1764 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1765 | return sshbuf_len(ssh->state->incoming_packet); |
Damien Miller | da108ec | 2010-08-31 22:36:39 +1000 | [diff] [blame] | 1766 | } |
| 1767 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1768 | /* |
| 1769 | * Sends a diagnostic message from the server to the client. This message |
| 1770 | * can be sent at any time (but not while constructing another message). The |
| 1771 | * message is printed immediately, but only if the client is being executed |
| 1772 | * in verbose mode. These messages are primarily intended to ease debugging |
| 1773 | * authentication problems. The length of the formatted message must not |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1774 | * exceed 1024 bytes. This will automatically call ssh_packet_write_wait. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1775 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1776 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1777 | ssh_packet_send_debug(struct ssh *ssh, const char *fmt,...) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1778 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1779 | char buf[1024]; |
| 1780 | va_list args; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1781 | int r; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1782 | |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame] | 1783 | if ((ssh->compat & SSH_BUG_DEBUG)) |
Ben Lindstrom | a14ee47 | 2000-12-07 01:24:58 +0000 | [diff] [blame] | 1784 | return; |
| 1785 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1786 | va_start(args, fmt); |
| 1787 | vsnprintf(buf, sizeof(buf), fmt, args); |
| 1788 | va_end(args); |
| 1789 | |
djm@openbsd.org | eb80e26 | 2017-10-13 21:13:54 +0000 | [diff] [blame] | 1790 | debug3("sending debug message: %s", buf); |
| 1791 | |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame] | 1792 | if ((r = sshpkt_start(ssh, SSH2_MSG_DEBUG)) != 0 || |
| 1793 | (r = sshpkt_put_u8(ssh, 0)) != 0 || /* always display */ |
| 1794 | (r = sshpkt_put_cstring(ssh, buf)) != 0 || |
| 1795 | (r = sshpkt_put_cstring(ssh, "")) != 0 || |
| 1796 | (r = sshpkt_send(ssh)) != 0 || |
| 1797 | (r = ssh_packet_write_wait(ssh)) != 0) |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1798 | fatal("%s: %s", __func__, ssh_err(r)); |
| 1799 | } |
| 1800 | |
dtucker@openbsd.org | 48c23a3 | 2017-12-10 05:55:29 +0000 | [diff] [blame] | 1801 | void |
| 1802 | sshpkt_fmt_connection_id(struct ssh *ssh, char *s, size_t l) |
djm@openbsd.org | 07edd7e | 2017-02-03 23:03:33 +0000 | [diff] [blame] | 1803 | { |
| 1804 | snprintf(s, l, "%.200s%s%s port %d", |
| 1805 | ssh->log_preamble ? ssh->log_preamble : "", |
| 1806 | ssh->log_preamble ? " " : "", |
| 1807 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh)); |
| 1808 | } |
| 1809 | |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1810 | /* |
| 1811 | * Pretty-print connection-terminating errors and exit. |
| 1812 | */ |
djm@openbsd.org | ad60b11 | 2019-01-19 21:33:13 +0000 | [diff] [blame] | 1813 | static void |
| 1814 | sshpkt_vfatal(struct ssh *ssh, int r, const char *fmt, va_list ap) |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1815 | { |
djm@openbsd.org | ad60b11 | 2019-01-19 21:33:13 +0000 | [diff] [blame] | 1816 | char *tag = NULL, remote_id[512]; |
djm@openbsd.org | 07edd7e | 2017-02-03 23:03:33 +0000 | [diff] [blame] | 1817 | |
dtucker@openbsd.org | 48c23a3 | 2017-12-10 05:55:29 +0000 | [diff] [blame] | 1818 | sshpkt_fmt_connection_id(ssh, remote_id, sizeof(remote_id)); |
djm@openbsd.org | 07edd7e | 2017-02-03 23:03:33 +0000 | [diff] [blame] | 1819 | |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1820 | switch (r) { |
| 1821 | case SSH_ERR_CONN_CLOSED: |
markus@openbsd.org | 1e0cdf8 | 2017-05-31 08:09:45 +0000 | [diff] [blame] | 1822 | ssh_packet_clear_keys(ssh); |
djm@openbsd.org | 07edd7e | 2017-02-03 23:03:33 +0000 | [diff] [blame] | 1823 | logdie("Connection closed by %s", remote_id); |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1824 | case SSH_ERR_CONN_TIMEOUT: |
markus@openbsd.org | 1e0cdf8 | 2017-05-31 08:09:45 +0000 | [diff] [blame] | 1825 | ssh_packet_clear_keys(ssh); |
djm@openbsd.org | 07edd7e | 2017-02-03 23:03:33 +0000 | [diff] [blame] | 1826 | logdie("Connection %s %s timed out", |
| 1827 | ssh->state->server_side ? "from" : "to", remote_id); |
djm@openbsd.org | 639d6bc | 2015-05-01 07:10:01 +0000 | [diff] [blame] | 1828 | case SSH_ERR_DISCONNECTED: |
markus@openbsd.org | 1e0cdf8 | 2017-05-31 08:09:45 +0000 | [diff] [blame] | 1829 | ssh_packet_clear_keys(ssh); |
djm@openbsd.org | 07edd7e | 2017-02-03 23:03:33 +0000 | [diff] [blame] | 1830 | logdie("Disconnected from %s", remote_id); |
djm@openbsd.org | 639d6bc | 2015-05-01 07:10:01 +0000 | [diff] [blame] | 1831 | case SSH_ERR_SYSTEM_ERROR: |
markus@openbsd.org | 1e0cdf8 | 2017-05-31 08:09:45 +0000 | [diff] [blame] | 1832 | if (errno == ECONNRESET) { |
| 1833 | ssh_packet_clear_keys(ssh); |
djm@openbsd.org | 07edd7e | 2017-02-03 23:03:33 +0000 | [diff] [blame] | 1834 | logdie("Connection reset by %s", remote_id); |
markus@openbsd.org | 1e0cdf8 | 2017-05-31 08:09:45 +0000 | [diff] [blame] | 1835 | } |
djm@openbsd.org | 639d6bc | 2015-05-01 07:10:01 +0000 | [diff] [blame] | 1836 | /* FALLTHROUGH */ |
djm@openbsd.org | f319912 | 2015-07-29 04:43:06 +0000 | [diff] [blame] | 1837 | case SSH_ERR_NO_CIPHER_ALG_MATCH: |
| 1838 | case SSH_ERR_NO_MAC_ALG_MATCH: |
| 1839 | case SSH_ERR_NO_COMPRESS_ALG_MATCH: |
| 1840 | case SSH_ERR_NO_KEX_ALG_MATCH: |
| 1841 | case SSH_ERR_NO_HOSTKEY_ALG_MATCH: |
| 1842 | if (ssh && ssh->kex && ssh->kex->failed_choice) { |
markus@openbsd.org | 1e0cdf8 | 2017-05-31 08:09:45 +0000 | [diff] [blame] | 1843 | ssh_packet_clear_keys(ssh); |
djm@openbsd.org | 07edd7e | 2017-02-03 23:03:33 +0000 | [diff] [blame] | 1844 | logdie("Unable to negotiate with %s: %s. " |
| 1845 | "Their offer: %s", remote_id, ssh_err(r), |
djm@openbsd.org | a4b9e0f | 2015-12-11 03:24:25 +0000 | [diff] [blame] | 1846 | ssh->kex->failed_choice); |
djm@openbsd.org | f319912 | 2015-07-29 04:43:06 +0000 | [diff] [blame] | 1847 | } |
| 1848 | /* FALLTHROUGH */ |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1849 | default: |
djm@openbsd.org | ad60b11 | 2019-01-19 21:33:13 +0000 | [diff] [blame] | 1850 | if (vasprintf(&tag, fmt, ap) == -1) { |
| 1851 | ssh_packet_clear_keys(ssh); |
| 1852 | logdie("%s: could not allocate failure message", |
| 1853 | __func__); |
| 1854 | } |
markus@openbsd.org | 1e0cdf8 | 2017-05-31 08:09:45 +0000 | [diff] [blame] | 1855 | ssh_packet_clear_keys(ssh); |
djm@openbsd.org | 07edd7e | 2017-02-03 23:03:33 +0000 | [diff] [blame] | 1856 | logdie("%s%sConnection %s %s: %s", |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1857 | tag != NULL ? tag : "", tag != NULL ? ": " : "", |
djm@openbsd.org | a4b9e0f | 2015-12-11 03:24:25 +0000 | [diff] [blame] | 1858 | ssh->state->server_side ? "from" : "to", |
djm@openbsd.org | 07edd7e | 2017-02-03 23:03:33 +0000 | [diff] [blame] | 1859 | remote_id, ssh_err(r)); |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1860 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1861 | } |
| 1862 | |
djm@openbsd.org | ad60b11 | 2019-01-19 21:33:13 +0000 | [diff] [blame] | 1863 | void |
| 1864 | sshpkt_fatal(struct ssh *ssh, int r, const char *fmt, ...) |
| 1865 | { |
| 1866 | va_list ap; |
| 1867 | |
| 1868 | va_start(ap, fmt); |
| 1869 | sshpkt_vfatal(ssh, r, fmt, ap); |
| 1870 | /* NOTREACHED */ |
| 1871 | va_end(ap); |
| 1872 | logdie("%s: should have exited", __func__); |
| 1873 | } |
| 1874 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1875 | /* |
| 1876 | * Logs the error plus constructs and sends a disconnect packet, closes the |
| 1877 | * connection, and exits. This function never returns. The error message |
| 1878 | * should not contain a newline. The length of the formatted message must |
| 1879 | * not exceed 1024 bytes. |
| 1880 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1881 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1882 | ssh_packet_disconnect(struct ssh *ssh, const char *fmt,...) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1883 | { |
djm@openbsd.org | 07edd7e | 2017-02-03 23:03:33 +0000 | [diff] [blame] | 1884 | char buf[1024], remote_id[512]; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1885 | va_list args; |
| 1886 | static int disconnecting = 0; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1887 | int r; |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 1888 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1889 | if (disconnecting) /* Guard against recursive invocations. */ |
| 1890 | fatal("packet_disconnect called recursively."); |
| 1891 | disconnecting = 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1892 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1893 | /* |
| 1894 | * Format the message. Note that the caller must make sure the |
| 1895 | * message is of limited size. |
| 1896 | */ |
dtucker@openbsd.org | 48c23a3 | 2017-12-10 05:55:29 +0000 | [diff] [blame] | 1897 | sshpkt_fmt_connection_id(ssh, remote_id, sizeof(remote_id)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1898 | va_start(args, fmt); |
| 1899 | vsnprintf(buf, sizeof(buf), fmt, args); |
| 1900 | va_end(args); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1901 | |
Ben Lindstrom | 9bda7ae | 2002-11-09 15:46:24 +0000 | [diff] [blame] | 1902 | /* Display the error locally */ |
djm@openbsd.org | 07edd7e | 2017-02-03 23:03:33 +0000 | [diff] [blame] | 1903 | logit("Disconnecting %s: %.100s", remote_id, buf); |
Ben Lindstrom | 9bda7ae | 2002-11-09 15:46:24 +0000 | [diff] [blame] | 1904 | |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1905 | /* |
| 1906 | * Send the disconnect message to the other side, and wait |
| 1907 | * for it to get sent. |
| 1908 | */ |
| 1909 | if ((r = sshpkt_disconnect(ssh, "%s", buf)) != 0) |
djm@openbsd.org | ad60b11 | 2019-01-19 21:33:13 +0000 | [diff] [blame] | 1910 | sshpkt_fatal(ssh, r, "%s", __func__); |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1911 | |
| 1912 | if ((r = ssh_packet_write_wait(ssh)) != 0) |
djm@openbsd.org | ad60b11 | 2019-01-19 21:33:13 +0000 | [diff] [blame] | 1913 | sshpkt_fatal(ssh, r, "%s", __func__); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1914 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1915 | /* Close the connection. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1916 | ssh_packet_close(ssh); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1917 | cleanup_exit(255); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1918 | } |
| 1919 | |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1920 | /* |
| 1921 | * Checks if there is any buffered output, and tries to write some of |
| 1922 | * the output. |
| 1923 | */ |
| 1924 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1925 | ssh_packet_write_poll(struct ssh *ssh) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1926 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1927 | struct session_state *state = ssh->state; |
| 1928 | int len = sshbuf_len(state->output); |
markus@openbsd.org | a306863 | 2016-01-14 16:17:39 +0000 | [diff] [blame] | 1929 | int r; |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 1930 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1931 | if (len > 0) { |
markus@openbsd.org | a306863 | 2016-01-14 16:17:39 +0000 | [diff] [blame] | 1932 | len = write(state->connection_out, |
| 1933 | sshbuf_ptr(state->output), len); |
Damien Miller | d874fa5 | 2008-07-05 09:40:56 +1000 | [diff] [blame] | 1934 | if (len == -1) { |
Damien Miller | ea43742 | 2009-10-02 11:49:03 +1000 | [diff] [blame] | 1935 | if (errno == EINTR || errno == EAGAIN || |
| 1936 | errno == EWOULDBLOCK) |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1937 | return 0; |
| 1938 | return SSH_ERR_SYSTEM_ERROR; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1939 | } |
markus@openbsd.org | a306863 | 2016-01-14 16:17:39 +0000 | [diff] [blame] | 1940 | if (len == 0) |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1941 | return SSH_ERR_CONN_CLOSED; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1942 | if ((r = sshbuf_consume(state->output, len)) != 0) |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1943 | return r; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1944 | } |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1945 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1946 | } |
| 1947 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1948 | /* |
| 1949 | * Calls packet_write_poll repeatedly until all pending output data has been |
| 1950 | * written. |
| 1951 | */ |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1952 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1953 | ssh_packet_write_wait(struct ssh *ssh) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1954 | { |
Ben Lindstrom | cb978aa | 2001-03-05 07:07:49 +0000 | [diff] [blame] | 1955 | fd_set *setp; |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1956 | int ret, r, ms_remain = 0; |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1957 | struct timeval start, timeout, *timeoutp = NULL; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1958 | struct session_state *state = ssh->state; |
Ben Lindstrom | cb978aa | 2001-03-05 07:07:49 +0000 | [diff] [blame] | 1959 | |
deraadt@openbsd.org | ce445b0 | 2015-08-20 22:32:42 +0000 | [diff] [blame] | 1960 | setp = calloc(howmany(state->connection_out + 1, |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 1961 | NFDBITS), sizeof(fd_mask)); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1962 | if (setp == NULL) |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1963 | return SSH_ERR_ALLOC_FAIL; |
gsoares@openbsd.org | 66d2e22 | 2015-10-21 11:33:03 +0000 | [diff] [blame] | 1964 | if ((r = ssh_packet_write_poll(ssh)) != 0) { |
| 1965 | free(setp); |
djm@openbsd.org | 8408218 | 2015-09-21 04:31:00 +0000 | [diff] [blame] | 1966 | return r; |
gsoares@openbsd.org | 66d2e22 | 2015-10-21 11:33:03 +0000 | [diff] [blame] | 1967 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1968 | while (ssh_packet_have_data_to_write(ssh)) { |
| 1969 | memset(setp, 0, howmany(state->connection_out + 1, |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 1970 | NFDBITS) * sizeof(fd_mask)); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1971 | FD_SET(state->connection_out, setp); |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1972 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1973 | if (state->packet_timeout_ms > 0) { |
| 1974 | ms_remain = state->packet_timeout_ms; |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1975 | timeoutp = &timeout; |
| 1976 | } |
| 1977 | for (;;) { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1978 | if (state->packet_timeout_ms != -1) { |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1979 | ms_to_timeval(&timeout, ms_remain); |
dtucker@openbsd.org@openbsd.org | 5db6fbf | 2017-11-25 06:46:22 +0000 | [diff] [blame] | 1980 | monotime_tv(&start); |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1981 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1982 | if ((ret = select(state->connection_out + 1, |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 1983 | NULL, setp, NULL, timeoutp)) >= 0) |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1984 | break; |
Damien Miller | ea43742 | 2009-10-02 11:49:03 +1000 | [diff] [blame] | 1985 | if (errno != EAGAIN && errno != EINTR && |
| 1986 | errno != EWOULDBLOCK) |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1987 | break; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 1988 | if (state->packet_timeout_ms == -1) |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1989 | continue; |
| 1990 | ms_subtract_diff(&start, &ms_remain); |
| 1991 | if (ms_remain <= 0) { |
| 1992 | ret = 0; |
| 1993 | break; |
| 1994 | } |
| 1995 | } |
| 1996 | if (ret == 0) { |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 1997 | free(setp); |
| 1998 | return SSH_ERR_CONN_TIMEOUT; |
Darren Tucker | 3fc464e | 2008-06-13 06:42:45 +1000 | [diff] [blame] | 1999 | } |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 2000 | if ((r = ssh_packet_write_poll(ssh)) != 0) { |
| 2001 | free(setp); |
| 2002 | return r; |
| 2003 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2004 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2005 | free(setp); |
djm@openbsd.org | 4509b5d | 2015-01-30 01:13:33 +0000 | [diff] [blame] | 2006 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2007 | } |
| 2008 | |
| 2009 | /* Returns true if there is buffered data to write to the connection. */ |
| 2010 | |
| 2011 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2012 | ssh_packet_have_data_to_write(struct ssh *ssh) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2013 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2014 | return sshbuf_len(ssh->state->output) != 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2015 | } |
| 2016 | |
| 2017 | /* Returns true if there is not too much data to write to the connection. */ |
| 2018 | |
| 2019 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2020 | ssh_packet_not_very_much_data_to_write(struct ssh *ssh) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2021 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2022 | if (ssh->state->interactive_mode) |
| 2023 | return sshbuf_len(ssh->state->output) < 16384; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2024 | else |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2025 | return sshbuf_len(ssh->state->output) < 128 * 1024; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2026 | } |
| 2027 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2028 | void |
| 2029 | ssh_packet_set_tos(struct ssh *ssh, int tos) |
Ben Lindstrom | a743398 | 2002-12-23 02:41:41 +0000 | [diff] [blame] | 2030 | { |
Damien Miller | d2ac5d7 | 2011-05-15 08:43:13 +1000 | [diff] [blame] | 2031 | #ifndef IP_TOS_IS_BROKEN |
djm@openbsd.org | 51676ec | 2017-07-23 23:37:02 +0000 | [diff] [blame] | 2032 | if (!ssh_packet_connection_is_on_socket(ssh) || tos == INT_MAX) |
Ben Lindstrom | a743398 | 2002-12-23 02:41:41 +0000 | [diff] [blame] | 2033 | return; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2034 | switch (ssh_packet_connection_af(ssh)) { |
Damien Miller | d2ac5d7 | 2011-05-15 08:43:13 +1000 | [diff] [blame] | 2035 | # ifdef IP_TOS |
| 2036 | case AF_INET: |
| 2037 | debug3("%s: set IP_TOS 0x%02x", __func__, tos); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2038 | if (setsockopt(ssh->state->connection_in, |
Damien Miller | d2ac5d7 | 2011-05-15 08:43:13 +1000 | [diff] [blame] | 2039 | IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0) |
| 2040 | error("setsockopt IP_TOS %d: %.100s:", |
| 2041 | tos, strerror(errno)); |
| 2042 | break; |
| 2043 | # endif /* IP_TOS */ |
| 2044 | # ifdef IPV6_TCLASS |
| 2045 | case AF_INET6: |
| 2046 | debug3("%s: set IPV6_TCLASS 0x%02x", __func__, tos); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2047 | if (setsockopt(ssh->state->connection_in, |
Damien Miller | d2ac5d7 | 2011-05-15 08:43:13 +1000 | [diff] [blame] | 2048 | IPPROTO_IPV6, IPV6_TCLASS, &tos, sizeof(tos)) < 0) |
| 2049 | error("setsockopt IPV6_TCLASS %d: %.100s:", |
| 2050 | tos, strerror(errno)); |
| 2051 | break; |
Damien Miller | d2ac5d7 | 2011-05-15 08:43:13 +1000 | [diff] [blame] | 2052 | # endif /* IPV6_TCLASS */ |
Damien Miller | 23f425b | 2011-05-15 08:58:15 +1000 | [diff] [blame] | 2053 | } |
Damien Miller | d2ac5d7 | 2011-05-15 08:43:13 +1000 | [diff] [blame] | 2054 | #endif /* IP_TOS_IS_BROKEN */ |
Damien Miller | 5924ceb | 2003-11-22 15:02:42 +1100 | [diff] [blame] | 2055 | } |
Ben Lindstrom | a743398 | 2002-12-23 02:41:41 +0000 | [diff] [blame] | 2056 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2057 | /* Informs that the current session is interactive. Sets IP flags for that. */ |
| 2058 | |
| 2059 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2060 | 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] | 2061 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2062 | struct session_state *state = ssh->state; |
| 2063 | |
| 2064 | if (state->set_interactive_called) |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 2065 | return; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2066 | state->set_interactive_called = 1; |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 2067 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2068 | /* Record that we are in interactive mode. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2069 | state->interactive_mode = interactive; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2070 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2071 | /* Only set socket options if using a socket. */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2072 | if (!ssh_packet_connection_is_on_socket(ssh)) |
Ben Lindstrom | 93b6b77 | 2003-04-27 17:55:33 +0000 | [diff] [blame] | 2073 | return; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2074 | set_nodelay(state->connection_in); |
| 2075 | ssh_packet_set_tos(ssh, interactive ? qos_interactive : |
| 2076 | qos_bulk); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2077 | } |
| 2078 | |
| 2079 | /* Returns true if the current connection is interactive. */ |
| 2080 | |
| 2081 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2082 | ssh_packet_is_interactive(struct ssh *ssh) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2083 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2084 | return ssh->state->interactive_mode; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2085 | } |
Damien Miller | 6162d12 | 1999-11-21 13:23:52 +1100 | [diff] [blame] | 2086 | |
Darren Tucker | 1f8311c | 2004-05-13 16:39:33 +1000 | [diff] [blame] | 2087 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2088 | ssh_packet_set_maxsize(struct ssh *ssh, u_int s) |
Damien Miller | 6162d12 | 1999-11-21 13:23:52 +1100 | [diff] [blame] | 2089 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2090 | struct session_state *state = ssh->state; |
| 2091 | |
| 2092 | if (state->set_maxsize_called) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 2093 | logit("packet_set_maxsize: called twice: old %d new %d", |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2094 | state->max_packet_size, s); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2095 | return -1; |
| 2096 | } |
| 2097 | if (s < 4 * 1024 || s > 1024 * 1024) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 2098 | logit("packet_set_maxsize: bad size %d", s); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2099 | return -1; |
| 2100 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2101 | state->set_maxsize_called = 1; |
Ben Lindstrom | 16d45b3 | 2001-06-13 04:39:18 +0000 | [diff] [blame] | 2102 | debug("packet_set_maxsize: setting to %d", s); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2103 | state->max_packet_size = s; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2104 | return s; |
Damien Miller | 6162d12 | 1999-11-21 13:23:52 +1100 | [diff] [blame] | 2105 | } |
Ben Lindstrom | 5699c5f | 2001-03-05 06:17:49 +0000 | [diff] [blame] | 2106 | |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2107 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2108 | ssh_packet_inc_alive_timeouts(struct ssh *ssh) |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2109 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2110 | return ++ssh->state->keep_alive_timeouts; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2111 | } |
| 2112 | |
| 2113 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2114 | ssh_packet_set_alive_timeouts(struct ssh *ssh, int ka) |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2115 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2116 | ssh->state->keep_alive_timeouts = ka; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2117 | } |
| 2118 | |
| 2119 | u_int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2120 | ssh_packet_get_maxsize(struct ssh *ssh) |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2121 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2122 | return ssh->state->max_packet_size; |
Damien Miller | 9f64390 | 2001-11-12 11:02:52 +1100 | [diff] [blame] | 2123 | } |
| 2124 | |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 2125 | void |
dtucker@openbsd.org | c998bf0 | 2017-02-03 02:56:00 +0000 | [diff] [blame] | 2126 | ssh_packet_set_rekey_limits(struct ssh *ssh, u_int64_t bytes, u_int32_t seconds) |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 2127 | { |
dtucker@openbsd.org | c998bf0 | 2017-02-03 02:56:00 +0000 | [diff] [blame] | 2128 | debug3("rekey after %llu bytes, %u seconds", (unsigned long long)bytes, |
| 2129 | (unsigned int)seconds); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2130 | ssh->state->rekey_limit = bytes; |
| 2131 | ssh->state->rekey_interval = seconds; |
Darren Tucker | c53c2af | 2013-05-16 20:28:16 +1000 | [diff] [blame] | 2132 | } |
| 2133 | |
| 2134 | time_t |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2135 | ssh_packet_get_rekey_timeout(struct ssh *ssh) |
Darren Tucker | c53c2af | 2013-05-16 20:28:16 +1000 | [diff] [blame] | 2136 | { |
| 2137 | time_t seconds; |
| 2138 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2139 | seconds = ssh->state->rekey_time + ssh->state->rekey_interval - |
Darren Tucker | b759c9c | 2013-06-02 07:46:16 +1000 | [diff] [blame] | 2140 | monotime(); |
Darren Tucker | 5f96f3b | 2013-05-16 20:29:28 +1000 | [diff] [blame] | 2141 | return (seconds <= 0 ? 1 : seconds); |
Damien Miller | a5539d2 | 2003-04-09 20:50:06 +1000 | [diff] [blame] | 2142 | } |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 2143 | |
| 2144 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2145 | ssh_packet_set_server(struct ssh *ssh) |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 2146 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2147 | ssh->state->server_side = 1; |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 2148 | ssh->kex->server = 1; /* XXX unify? */ |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 2149 | } |
| 2150 | |
| 2151 | void |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2152 | ssh_packet_set_authenticated(struct ssh *ssh) |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 2153 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2154 | ssh->state->after_authentication = 1; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2155 | } |
| 2156 | |
| 2157 | void * |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2158 | ssh_packet_get_input(struct ssh *ssh) |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2159 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2160 | return (void *)ssh->state->input; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2161 | } |
| 2162 | |
| 2163 | void * |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2164 | ssh_packet_get_output(struct ssh *ssh) |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2165 | { |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2166 | return (void *)ssh->state->output; |
Darren Tucker | f7288d7 | 2009-06-21 18:12:20 +1000 | [diff] [blame] | 2167 | } |
| 2168 | |
Damien Miller | c31a0cd | 2014-05-15 14:37:39 +1000 | [diff] [blame] | 2169 | /* Reset after_authentication and reset compression in post-auth privsep */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2170 | static int |
| 2171 | ssh_packet_set_postauth(struct ssh *ssh) |
Damien Miller | c31a0cd | 2014-05-15 14:37:39 +1000 | [diff] [blame] | 2172 | { |
djm@openbsd.org | 0082fba | 2016-09-28 16:33:06 +0000 | [diff] [blame] | 2173 | int r; |
Damien Miller | c31a0cd | 2014-05-15 14:37:39 +1000 | [diff] [blame] | 2174 | |
| 2175 | debug("%s: called", __func__); |
| 2176 | /* 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] | 2177 | ssh->state->after_authentication = 1; |
| 2178 | ssh->state->rekeying = 0; |
djm@openbsd.org | 0082fba | 2016-09-28 16:33:06 +0000 | [diff] [blame] | 2179 | if ((r = ssh_packet_enable_delayed_compress(ssh)) != 0) |
| 2180 | return r; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2181 | return 0; |
| 2182 | } |
| 2183 | |
| 2184 | /* Packet state (de-)serialization for privsep */ |
| 2185 | |
| 2186 | /* turn kex into a blob for packet state serialization */ |
| 2187 | static int |
| 2188 | kex_to_blob(struct sshbuf *m, struct kex *kex) |
| 2189 | { |
| 2190 | int r; |
| 2191 | |
| 2192 | if ((r = sshbuf_put_string(m, kex->session_id, |
| 2193 | kex->session_id_len)) != 0 || |
| 2194 | (r = sshbuf_put_u32(m, kex->we_need)) != 0 || |
djm@openbsd.org | 349ecd4 | 2017-12-18 23:13:42 +0000 | [diff] [blame] | 2195 | (r = sshbuf_put_cstring(m, kex->hostkey_alg)) != 0 || |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2196 | (r = sshbuf_put_u32(m, kex->hostkey_type)) != 0 || |
djm@openbsd.org | 349ecd4 | 2017-12-18 23:13:42 +0000 | [diff] [blame] | 2197 | (r = sshbuf_put_u32(m, kex->hostkey_nid)) != 0 || |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2198 | (r = sshbuf_put_u32(m, kex->kex_type)) != 0 || |
| 2199 | (r = sshbuf_put_stringb(m, kex->my)) != 0 || |
| 2200 | (r = sshbuf_put_stringb(m, kex->peer)) != 0 || |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 2201 | (r = sshbuf_put_stringb(m, kex->client_version)) != 0 || |
| 2202 | (r = sshbuf_put_stringb(m, kex->server_version)) != 0 || |
| 2203 | (r = sshbuf_put_u32(m, kex->flags)) != 0) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2204 | return r; |
| 2205 | return 0; |
| 2206 | } |
| 2207 | |
| 2208 | /* turn key exchange results into a blob for packet state serialization */ |
| 2209 | static int |
| 2210 | newkeys_to_blob(struct sshbuf *m, struct ssh *ssh, int mode) |
| 2211 | { |
| 2212 | struct sshbuf *b; |
| 2213 | struct sshcipher_ctx *cc; |
| 2214 | struct sshcomp *comp; |
| 2215 | struct sshenc *enc; |
| 2216 | struct sshmac *mac; |
| 2217 | struct newkeys *newkey; |
| 2218 | int r; |
| 2219 | |
| 2220 | if ((newkey = ssh->state->newkeys[mode]) == NULL) |
| 2221 | return SSH_ERR_INTERNAL_ERROR; |
| 2222 | enc = &newkey->enc; |
| 2223 | mac = &newkey->mac; |
| 2224 | comp = &newkey->comp; |
djm@openbsd.org | 4706c1d | 2016-08-03 05:41:57 +0000 | [diff] [blame] | 2225 | cc = (mode == MODE_OUT) ? ssh->state->send_context : |
| 2226 | ssh->state->receive_context; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2227 | if ((r = cipher_get_keyiv(cc, enc->iv, enc->iv_len)) != 0) |
| 2228 | return r; |
| 2229 | if ((b = sshbuf_new()) == NULL) |
| 2230 | return SSH_ERR_ALLOC_FAIL; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2231 | if ((r = sshbuf_put_cstring(b, enc->name)) != 0 || |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2232 | (r = sshbuf_put_u32(b, enc->enabled)) != 0 || |
| 2233 | (r = sshbuf_put_u32(b, enc->block_size)) != 0 || |
| 2234 | (r = sshbuf_put_string(b, enc->key, enc->key_len)) != 0 || |
| 2235 | (r = sshbuf_put_string(b, enc->iv, enc->iv_len)) != 0) |
| 2236 | goto out; |
| 2237 | if (cipher_authlen(enc->cipher) == 0) { |
| 2238 | if ((r = sshbuf_put_cstring(b, mac->name)) != 0 || |
| 2239 | (r = sshbuf_put_u32(b, mac->enabled)) != 0 || |
| 2240 | (r = sshbuf_put_string(b, mac->key, mac->key_len)) != 0) |
| 2241 | goto out; |
| 2242 | } |
| 2243 | if ((r = sshbuf_put_u32(b, comp->type)) != 0 || |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2244 | (r = sshbuf_put_cstring(b, comp->name)) != 0) |
| 2245 | goto out; |
| 2246 | r = sshbuf_put_stringb(m, b); |
| 2247 | out: |
mmcc@openbsd.org | 52d7078 | 2015-12-11 04:21:11 +0000 | [diff] [blame] | 2248 | sshbuf_free(b); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2249 | return r; |
| 2250 | } |
| 2251 | |
| 2252 | /* serialize packet state into a blob */ |
| 2253 | int |
| 2254 | ssh_packet_get_state(struct ssh *ssh, struct sshbuf *m) |
| 2255 | { |
| 2256 | struct session_state *state = ssh->state; |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame] | 2257 | int r; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2258 | |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame] | 2259 | if ((r = kex_to_blob(m, ssh->kex)) != 0 || |
| 2260 | (r = newkeys_to_blob(m, ssh, MODE_OUT)) != 0 || |
| 2261 | (r = newkeys_to_blob(m, ssh, MODE_IN)) != 0 || |
| 2262 | (r = sshbuf_put_u64(m, state->rekey_limit)) != 0 || |
| 2263 | (r = sshbuf_put_u32(m, state->rekey_interval)) != 0 || |
| 2264 | (r = sshbuf_put_u32(m, state->p_send.seqnr)) != 0 || |
| 2265 | (r = sshbuf_put_u64(m, state->p_send.blocks)) != 0 || |
| 2266 | (r = sshbuf_put_u32(m, state->p_send.packets)) != 0 || |
| 2267 | (r = sshbuf_put_u64(m, state->p_send.bytes)) != 0 || |
| 2268 | (r = sshbuf_put_u32(m, state->p_read.seqnr)) != 0 || |
| 2269 | (r = sshbuf_put_u64(m, state->p_read.blocks)) != 0 || |
| 2270 | (r = sshbuf_put_u32(m, state->p_read.packets)) != 0 || |
djm@openbsd.org | 7461a5b | 2017-05-08 00:21:36 +0000 | [diff] [blame] | 2271 | (r = sshbuf_put_u64(m, state->p_read.bytes)) != 0 || |
| 2272 | (r = sshbuf_put_stringb(m, state->input)) != 0 || |
| 2273 | (r = sshbuf_put_stringb(m, state->output)) != 0) |
djm@openbsd.org | 2e58a69 | 2017-05-08 06:03:39 +0000 | [diff] [blame] | 2274 | return r; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2275 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2276 | return 0; |
| 2277 | } |
| 2278 | |
| 2279 | /* restore key exchange results from blob for packet state de-serialization */ |
| 2280 | static int |
| 2281 | newkeys_from_blob(struct sshbuf *m, struct ssh *ssh, int mode) |
| 2282 | { |
| 2283 | struct sshbuf *b = NULL; |
| 2284 | struct sshcomp *comp; |
| 2285 | struct sshenc *enc; |
| 2286 | struct sshmac *mac; |
| 2287 | struct newkeys *newkey = NULL; |
| 2288 | size_t keylen, ivlen, maclen; |
| 2289 | int r; |
| 2290 | |
| 2291 | if ((newkey = calloc(1, sizeof(*newkey))) == NULL) { |
| 2292 | r = SSH_ERR_ALLOC_FAIL; |
| 2293 | goto out; |
| 2294 | } |
| 2295 | if ((r = sshbuf_froms(m, &b)) != 0) |
| 2296 | goto out; |
| 2297 | #ifdef DEBUG_PK |
| 2298 | sshbuf_dump(b, stderr); |
| 2299 | #endif |
| 2300 | enc = &newkey->enc; |
| 2301 | mac = &newkey->mac; |
| 2302 | comp = &newkey->comp; |
| 2303 | |
| 2304 | if ((r = sshbuf_get_cstring(b, &enc->name, NULL)) != 0 || |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2305 | (r = sshbuf_get_u32(b, (u_int *)&enc->enabled)) != 0 || |
| 2306 | (r = sshbuf_get_u32(b, &enc->block_size)) != 0 || |
| 2307 | (r = sshbuf_get_string(b, &enc->key, &keylen)) != 0 || |
| 2308 | (r = sshbuf_get_string(b, &enc->iv, &ivlen)) != 0) |
| 2309 | goto out; |
djm@openbsd.org | 33f8626 | 2017-06-24 06:38:11 +0000 | [diff] [blame] | 2310 | if ((enc->cipher = cipher_by_name(enc->name)) == NULL) { |
| 2311 | r = SSH_ERR_INVALID_FORMAT; |
| 2312 | goto out; |
| 2313 | } |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2314 | if (cipher_authlen(enc->cipher) == 0) { |
| 2315 | if ((r = sshbuf_get_cstring(b, &mac->name, NULL)) != 0) |
| 2316 | goto out; |
| 2317 | if ((r = mac_setup(mac, mac->name)) != 0) |
| 2318 | goto out; |
| 2319 | if ((r = sshbuf_get_u32(b, (u_int *)&mac->enabled)) != 0 || |
| 2320 | (r = sshbuf_get_string(b, &mac->key, &maclen)) != 0) |
| 2321 | goto out; |
| 2322 | if (maclen > mac->key_len) { |
| 2323 | r = SSH_ERR_INVALID_FORMAT; |
| 2324 | goto out; |
| 2325 | } |
| 2326 | mac->key_len = maclen; |
| 2327 | } |
| 2328 | if ((r = sshbuf_get_u32(b, &comp->type)) != 0 || |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2329 | (r = sshbuf_get_cstring(b, &comp->name, NULL)) != 0) |
| 2330 | goto out; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2331 | if (sshbuf_len(b) != 0) { |
| 2332 | r = SSH_ERR_INVALID_FORMAT; |
| 2333 | goto out; |
| 2334 | } |
| 2335 | enc->key_len = keylen; |
| 2336 | enc->iv_len = ivlen; |
| 2337 | ssh->kex->newkeys[mode] = newkey; |
| 2338 | newkey = NULL; |
| 2339 | r = 0; |
| 2340 | out: |
mmcc@openbsd.org | d59ce08 | 2015-12-10 17:08:40 +0000 | [diff] [blame] | 2341 | free(newkey); |
mmcc@openbsd.org | 52d7078 | 2015-12-11 04:21:11 +0000 | [diff] [blame] | 2342 | sshbuf_free(b); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2343 | return r; |
| 2344 | } |
| 2345 | |
| 2346 | /* restore kex from blob for packet state de-serialization */ |
| 2347 | static int |
| 2348 | kex_from_blob(struct sshbuf *m, struct kex **kexp) |
| 2349 | { |
| 2350 | struct kex *kex; |
| 2351 | int r; |
| 2352 | |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 2353 | if ((kex = kex_new()) == NULL) |
| 2354 | return SSH_ERR_ALLOC_FAIL; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2355 | if ((r = sshbuf_get_string(m, &kex->session_id, &kex->session_id_len)) != 0 || |
| 2356 | (r = sshbuf_get_u32(m, &kex->we_need)) != 0 || |
djm@openbsd.org | 349ecd4 | 2017-12-18 23:13:42 +0000 | [diff] [blame] | 2357 | (r = sshbuf_get_cstring(m, &kex->hostkey_alg, NULL)) != 0 || |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2358 | (r = sshbuf_get_u32(m, (u_int *)&kex->hostkey_type)) != 0 || |
djm@openbsd.org | 349ecd4 | 2017-12-18 23:13:42 +0000 | [diff] [blame] | 2359 | (r = sshbuf_get_u32(m, (u_int *)&kex->hostkey_nid)) != 0 || |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2360 | (r = sshbuf_get_u32(m, &kex->kex_type)) != 0 || |
| 2361 | (r = sshbuf_get_stringb(m, kex->my)) != 0 || |
| 2362 | (r = sshbuf_get_stringb(m, kex->peer)) != 0 || |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 2363 | (r = sshbuf_get_stringb(m, kex->client_version)) != 0 || |
| 2364 | (r = sshbuf_get_stringb(m, kex->server_version)) != 0 || |
| 2365 | (r = sshbuf_get_u32(m, &kex->flags)) != 0) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2366 | goto out; |
| 2367 | kex->server = 1; |
| 2368 | kex->done = 1; |
| 2369 | r = 0; |
| 2370 | out: |
| 2371 | if (r != 0 || kexp == NULL) { |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 2372 | kex_free(kex); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2373 | if (kexp != NULL) |
| 2374 | *kexp = NULL; |
| 2375 | } else { |
djm@openbsd.org | 0a843d9 | 2018-12-27 03:25:24 +0000 | [diff] [blame] | 2376 | kex_free(*kexp); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2377 | *kexp = kex; |
| 2378 | } |
| 2379 | return r; |
| 2380 | } |
| 2381 | |
| 2382 | /* |
| 2383 | * Restore packet state from content of blob 'm' (de-serialization). |
| 2384 | * Note that 'm' will be partially consumed on parsing or any other errors. |
| 2385 | */ |
| 2386 | int |
| 2387 | ssh_packet_set_state(struct ssh *ssh, struct sshbuf *m) |
| 2388 | { |
| 2389 | struct session_state *state = ssh->state; |
djm@openbsd.org | acaf34f | 2017-05-07 23:12:57 +0000 | [diff] [blame] | 2390 | const u_char *input, *output; |
| 2391 | size_t ilen, olen; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2392 | int r; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2393 | |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame] | 2394 | if ((r = kex_from_blob(m, &ssh->kex)) != 0 || |
| 2395 | (r = newkeys_from_blob(m, ssh, MODE_OUT)) != 0 || |
| 2396 | (r = newkeys_from_blob(m, ssh, MODE_IN)) != 0 || |
| 2397 | (r = sshbuf_get_u64(m, &state->rekey_limit)) != 0 || |
| 2398 | (r = sshbuf_get_u32(m, &state->rekey_interval)) != 0 || |
| 2399 | (r = sshbuf_get_u32(m, &state->p_send.seqnr)) != 0 || |
| 2400 | (r = sshbuf_get_u64(m, &state->p_send.blocks)) != 0 || |
| 2401 | (r = sshbuf_get_u32(m, &state->p_send.packets)) != 0 || |
| 2402 | (r = sshbuf_get_u64(m, &state->p_send.bytes)) != 0 || |
| 2403 | (r = sshbuf_get_u32(m, &state->p_read.seqnr)) != 0 || |
| 2404 | (r = sshbuf_get_u64(m, &state->p_read.blocks)) != 0 || |
| 2405 | (r = sshbuf_get_u32(m, &state->p_read.packets)) != 0 || |
| 2406 | (r = sshbuf_get_u64(m, &state->p_read.bytes)) != 0) |
| 2407 | return r; |
| 2408 | /* |
| 2409 | * We set the time here so that in post-auth privsep slave we |
| 2410 | * count from the completion of the authentication. |
| 2411 | */ |
| 2412 | state->rekey_time = monotime(); |
| 2413 | /* XXX ssh_set_newkeys overrides p_read.packets? XXX */ |
| 2414 | if ((r = ssh_set_newkeys(ssh, MODE_IN)) != 0 || |
| 2415 | (r = ssh_set_newkeys(ssh, MODE_OUT)) != 0) |
| 2416 | return r; |
| 2417 | |
djm@openbsd.org | 0082fba | 2016-09-28 16:33:06 +0000 | [diff] [blame] | 2418 | if ((r = ssh_packet_set_postauth(ssh)) != 0) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2419 | return r; |
| 2420 | |
| 2421 | sshbuf_reset(state->input); |
| 2422 | sshbuf_reset(state->output); |
| 2423 | if ((r = sshbuf_get_string_direct(m, &input, &ilen)) != 0 || |
| 2424 | (r = sshbuf_get_string_direct(m, &output, &olen)) != 0 || |
| 2425 | (r = sshbuf_put(state->input, input, ilen)) != 0 || |
| 2426 | (r = sshbuf_put(state->output, output, olen)) != 0) |
| 2427 | return r; |
| 2428 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2429 | if (sshbuf_len(m)) |
| 2430 | return SSH_ERR_INVALID_FORMAT; |
| 2431 | debug3("%s: done", __func__); |
| 2432 | return 0; |
| 2433 | } |
| 2434 | |
| 2435 | /* NEW API */ |
| 2436 | |
| 2437 | /* put data to the outgoing packet */ |
| 2438 | |
| 2439 | int |
| 2440 | sshpkt_put(struct ssh *ssh, const void *v, size_t len) |
| 2441 | { |
| 2442 | return sshbuf_put(ssh->state->outgoing_packet, v, len); |
| 2443 | } |
| 2444 | |
| 2445 | int |
| 2446 | sshpkt_putb(struct ssh *ssh, const struct sshbuf *b) |
| 2447 | { |
| 2448 | return sshbuf_putb(ssh->state->outgoing_packet, b); |
| 2449 | } |
| 2450 | |
| 2451 | int |
| 2452 | sshpkt_put_u8(struct ssh *ssh, u_char val) |
| 2453 | { |
| 2454 | return sshbuf_put_u8(ssh->state->outgoing_packet, val); |
| 2455 | } |
| 2456 | |
| 2457 | int |
| 2458 | sshpkt_put_u32(struct ssh *ssh, u_int32_t val) |
| 2459 | { |
| 2460 | return sshbuf_put_u32(ssh->state->outgoing_packet, val); |
| 2461 | } |
| 2462 | |
| 2463 | int |
| 2464 | sshpkt_put_u64(struct ssh *ssh, u_int64_t val) |
| 2465 | { |
| 2466 | return sshbuf_put_u64(ssh->state->outgoing_packet, val); |
| 2467 | } |
| 2468 | |
| 2469 | int |
| 2470 | sshpkt_put_string(struct ssh *ssh, const void *v, size_t len) |
| 2471 | { |
| 2472 | return sshbuf_put_string(ssh->state->outgoing_packet, v, len); |
| 2473 | } |
| 2474 | |
| 2475 | int |
| 2476 | sshpkt_put_cstring(struct ssh *ssh, const void *v) |
| 2477 | { |
| 2478 | return sshbuf_put_cstring(ssh->state->outgoing_packet, v); |
| 2479 | } |
| 2480 | |
| 2481 | int |
| 2482 | sshpkt_put_stringb(struct ssh *ssh, const struct sshbuf *v) |
| 2483 | { |
| 2484 | return sshbuf_put_stringb(ssh->state->outgoing_packet, v); |
| 2485 | } |
| 2486 | |
djm@openbsd.org | 71e67ff | 2019-01-21 10:35:09 +0000 | [diff] [blame] | 2487 | int |
| 2488 | sshpkt_getb_froms(struct ssh *ssh, struct sshbuf **valp) |
| 2489 | { |
| 2490 | return sshbuf_froms(ssh->state->incoming_packet, valp); |
| 2491 | } |
| 2492 | |
djm@openbsd.org | 734226b | 2015-04-27 01:52:30 +0000 | [diff] [blame] | 2493 | #ifdef WITH_OPENSSL |
| 2494 | #ifdef OPENSSL_HAS_ECC |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2495 | int |
| 2496 | sshpkt_put_ec(struct ssh *ssh, const EC_POINT *v, const EC_GROUP *g) |
| 2497 | { |
| 2498 | return sshbuf_put_ec(ssh->state->outgoing_packet, v, g); |
| 2499 | } |
djm@openbsd.org | 734226b | 2015-04-27 01:52:30 +0000 | [diff] [blame] | 2500 | #endif /* OPENSSL_HAS_ECC */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2501 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2502 | |
| 2503 | int |
| 2504 | sshpkt_put_bignum2(struct ssh *ssh, const BIGNUM *v) |
| 2505 | { |
| 2506 | return sshbuf_put_bignum2(ssh->state->outgoing_packet, v); |
| 2507 | } |
Damien Miller | 773dda2 | 2015-01-30 23:10:17 +1100 | [diff] [blame] | 2508 | #endif /* WITH_OPENSSL */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2509 | |
| 2510 | /* fetch data from the incoming packet */ |
| 2511 | |
| 2512 | int |
| 2513 | sshpkt_get(struct ssh *ssh, void *valp, size_t len) |
| 2514 | { |
| 2515 | return sshbuf_get(ssh->state->incoming_packet, valp, len); |
| 2516 | } |
| 2517 | |
| 2518 | int |
| 2519 | sshpkt_get_u8(struct ssh *ssh, u_char *valp) |
| 2520 | { |
| 2521 | return sshbuf_get_u8(ssh->state->incoming_packet, valp); |
| 2522 | } |
| 2523 | |
| 2524 | int |
| 2525 | sshpkt_get_u32(struct ssh *ssh, u_int32_t *valp) |
| 2526 | { |
| 2527 | return sshbuf_get_u32(ssh->state->incoming_packet, valp); |
| 2528 | } |
| 2529 | |
| 2530 | int |
| 2531 | sshpkt_get_u64(struct ssh *ssh, u_int64_t *valp) |
| 2532 | { |
| 2533 | return sshbuf_get_u64(ssh->state->incoming_packet, valp); |
| 2534 | } |
| 2535 | |
| 2536 | int |
| 2537 | sshpkt_get_string(struct ssh *ssh, u_char **valp, size_t *lenp) |
| 2538 | { |
| 2539 | return sshbuf_get_string(ssh->state->incoming_packet, valp, lenp); |
| 2540 | } |
| 2541 | |
| 2542 | int |
| 2543 | sshpkt_get_string_direct(struct ssh *ssh, const u_char **valp, size_t *lenp) |
| 2544 | { |
| 2545 | return sshbuf_get_string_direct(ssh->state->incoming_packet, valp, lenp); |
| 2546 | } |
| 2547 | |
| 2548 | int |
djm@openbsd.org | dbee411 | 2017-09-12 06:32:07 +0000 | [diff] [blame] | 2549 | sshpkt_peek_string_direct(struct ssh *ssh, const u_char **valp, size_t *lenp) |
| 2550 | { |
| 2551 | return sshbuf_peek_string_direct(ssh->state->incoming_packet, valp, lenp); |
| 2552 | } |
| 2553 | |
| 2554 | int |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2555 | sshpkt_get_cstring(struct ssh *ssh, char **valp, size_t *lenp) |
| 2556 | { |
| 2557 | return sshbuf_get_cstring(ssh->state->incoming_packet, valp, lenp); |
| 2558 | } |
| 2559 | |
djm@openbsd.org | 734226b | 2015-04-27 01:52:30 +0000 | [diff] [blame] | 2560 | #ifdef WITH_OPENSSL |
| 2561 | #ifdef OPENSSL_HAS_ECC |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2562 | int |
| 2563 | sshpkt_get_ec(struct ssh *ssh, EC_POINT *v, const EC_GROUP *g) |
| 2564 | { |
| 2565 | return sshbuf_get_ec(ssh->state->incoming_packet, v, g); |
| 2566 | } |
djm@openbsd.org | 734226b | 2015-04-27 01:52:30 +0000 | [diff] [blame] | 2567 | #endif /* OPENSSL_HAS_ECC */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2568 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2569 | int |
djm@openbsd.org | 7be8572 | 2019-01-21 09:54:11 +0000 | [diff] [blame] | 2570 | sshpkt_get_bignum2(struct ssh *ssh, BIGNUM **valp) |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2571 | { |
djm@openbsd.org | 7be8572 | 2019-01-21 09:54:11 +0000 | [diff] [blame] | 2572 | return sshbuf_get_bignum2(ssh->state->incoming_packet, valp); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2573 | } |
Damien Miller | 773dda2 | 2015-01-30 23:10:17 +1100 | [diff] [blame] | 2574 | #endif /* WITH_OPENSSL */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2575 | |
| 2576 | int |
| 2577 | sshpkt_get_end(struct ssh *ssh) |
| 2578 | { |
| 2579 | if (sshbuf_len(ssh->state->incoming_packet) > 0) |
| 2580 | return SSH_ERR_UNEXPECTED_TRAILING_DATA; |
| 2581 | return 0; |
| 2582 | } |
| 2583 | |
| 2584 | const u_char * |
| 2585 | sshpkt_ptr(struct ssh *ssh, size_t *lenp) |
| 2586 | { |
| 2587 | if (lenp != NULL) |
| 2588 | *lenp = sshbuf_len(ssh->state->incoming_packet); |
| 2589 | return sshbuf_ptr(ssh->state->incoming_packet); |
| 2590 | } |
| 2591 | |
| 2592 | /* start a new packet */ |
| 2593 | |
| 2594 | int |
| 2595 | sshpkt_start(struct ssh *ssh, u_char type) |
| 2596 | { |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame] | 2597 | u_char buf[6]; /* u32 packet length, u8 pad len, u8 type */ |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2598 | |
| 2599 | DBG(debug("packet_start[%d]", type)); |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame] | 2600 | memset(buf, 0, sizeof(buf)); |
| 2601 | buf[sizeof(buf) - 1] = type; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2602 | sshbuf_reset(ssh->state->outgoing_packet); |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame] | 2603 | return sshbuf_put(ssh->state->outgoing_packet, buf, sizeof(buf)); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2604 | } |
| 2605 | |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 2606 | static int |
| 2607 | ssh_packet_send_mux(struct ssh *ssh) |
| 2608 | { |
| 2609 | struct session_state *state = ssh->state; |
| 2610 | u_char type, *cp; |
| 2611 | size_t len; |
| 2612 | int r; |
| 2613 | |
| 2614 | if (ssh->kex) |
| 2615 | return SSH_ERR_INTERNAL_ERROR; |
| 2616 | len = sshbuf_len(state->outgoing_packet); |
| 2617 | if (len < 6) |
| 2618 | return SSH_ERR_INTERNAL_ERROR; |
| 2619 | cp = sshbuf_mutable_ptr(state->outgoing_packet); |
| 2620 | type = cp[5]; |
| 2621 | if (ssh_packet_log_type(type)) |
| 2622 | debug3("%s: type %u", __func__, type); |
| 2623 | /* drop everything, but the connection protocol */ |
| 2624 | if (type >= SSH2_MSG_CONNECTION_MIN && |
| 2625 | type <= SSH2_MSG_CONNECTION_MAX) { |
| 2626 | POKE_U32(cp, len - 4); |
| 2627 | if ((r = sshbuf_putb(state->output, |
| 2628 | state->outgoing_packet)) != 0) |
| 2629 | return r; |
| 2630 | /* sshbuf_dump(state->output, stderr); */ |
| 2631 | } |
| 2632 | sshbuf_reset(state->outgoing_packet); |
| 2633 | return 0; |
| 2634 | } |
| 2635 | |
djm@openbsd.org | dbee411 | 2017-09-12 06:32:07 +0000 | [diff] [blame] | 2636 | /* |
| 2637 | * 9.2. Ignored Data Message |
| 2638 | * |
| 2639 | * byte SSH_MSG_IGNORE |
| 2640 | * string data |
| 2641 | * |
| 2642 | * All implementations MUST understand (and ignore) this message at any |
| 2643 | * time (after receiving the protocol version). No implementation is |
| 2644 | * required to send them. This message can be used as an additional |
| 2645 | * protection measure against advanced traffic analysis techniques. |
| 2646 | */ |
| 2647 | int |
| 2648 | sshpkt_msg_ignore(struct ssh *ssh, u_int nbytes) |
| 2649 | { |
| 2650 | u_int32_t rnd = 0; |
| 2651 | int r; |
| 2652 | u_int i; |
| 2653 | |
| 2654 | if ((r = sshpkt_start(ssh, SSH2_MSG_IGNORE)) != 0 || |
| 2655 | (r = sshpkt_put_u32(ssh, nbytes)) != 0) |
| 2656 | return r; |
| 2657 | for (i = 0; i < nbytes; i++) { |
| 2658 | if (i % 4 == 0) |
| 2659 | rnd = arc4random(); |
| 2660 | if ((r = sshpkt_put_u8(ssh, (u_char)rnd & 0xff)) != 0) |
| 2661 | return r; |
| 2662 | rnd >>= 8; |
| 2663 | } |
| 2664 | return 0; |
| 2665 | } |
| 2666 | |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2667 | /* send it */ |
| 2668 | |
| 2669 | int |
| 2670 | sshpkt_send(struct ssh *ssh) |
| 2671 | { |
markus@openbsd.org | 8d05784 | 2016-09-30 09:19:13 +0000 | [diff] [blame] | 2672 | if (ssh->state && ssh->state->mux) |
| 2673 | return ssh_packet_send_mux(ssh); |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame] | 2674 | return ssh_packet_send2(ssh); |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2675 | } |
| 2676 | |
| 2677 | int |
| 2678 | sshpkt_disconnect(struct ssh *ssh, const char *fmt,...) |
| 2679 | { |
| 2680 | char buf[1024]; |
| 2681 | va_list args; |
| 2682 | int r; |
| 2683 | |
| 2684 | va_start(args, fmt); |
| 2685 | vsnprintf(buf, sizeof(buf), fmt, args); |
| 2686 | va_end(args); |
| 2687 | |
djm@openbsd.org | 97f4d30 | 2017-04-30 23:13:25 +0000 | [diff] [blame] | 2688 | if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 || |
| 2689 | (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_PROTOCOL_ERROR)) != 0 || |
| 2690 | (r = sshpkt_put_cstring(ssh, buf)) != 0 || |
| 2691 | (r = sshpkt_put_cstring(ssh, "")) != 0 || |
| 2692 | (r = sshpkt_send(ssh)) != 0) |
| 2693 | return r; |
markus@openbsd.org | 091c302 | 2015-01-19 19:52:16 +0000 | [diff] [blame] | 2694 | return 0; |
| 2695 | } |
| 2696 | |
| 2697 | /* roundup current message to pad bytes */ |
| 2698 | int |
| 2699 | sshpkt_add_padding(struct ssh *ssh, u_char pad) |
| 2700 | { |
| 2701 | ssh->state->extra_pad = pad; |
| 2702 | return 0; |
Damien Miller | c31a0cd | 2014-05-15 14:37:39 +1000 | [diff] [blame] | 2703 | } |