Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1 | /* $OpenBSD: packet.c,v 1.247 2017/03/11 13:07:35 markus Exp $ */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2 | /* |
| 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 5 | * All rights reserved |
| 6 | * This file contains code implementing the packet protocol and communication |
| 7 | * with the other side. This same code is used both on client and server side. |
| 8 | * |
| 9 | * As far as I am concerned, the code I have written for this software |
| 10 | * can be used freely for any purpose. Any derived versions of this |
| 11 | * software must be clearly marked as such, and if the derived work is |
| 12 | * incompatible with the protocol description in the RFC file, it must be |
| 13 | * called by a name other than "ssh" or "Secure Shell". |
| 14 | * |
| 15 | * |
| 16 | * SSH2 packet format added by Markus Friedl. |
| 17 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
| 18 | * |
| 19 | * Redistribution and use in source and binary forms, with or without |
| 20 | * modification, are permitted provided that the following conditions |
| 21 | * are met: |
| 22 | * 1. Redistributions of source code must retain the above copyright |
| 23 | * notice, this list of conditions and the following disclaimer. |
| 24 | * 2. Redistributions in binary form must reproduce the above copyright |
| 25 | * notice, this list of conditions and the following disclaimer in the |
| 26 | * documentation and/or other materials provided with the distribution. |
| 27 | * |
| 28 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 29 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 30 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 31 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 32 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 33 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 34 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 35 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 36 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 37 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 38 | */ |
| 39 | |
| 40 | #include "includes.h" |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 41 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 42 | #include <sys/types.h> |
| 43 | #include "openbsd-compat/sys-queue.h" |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 44 | #include <sys/socket.h> |
| 45 | #ifdef HAVE_SYS_TIME_H |
| 46 | # include <sys/time.h> |
| 47 | #endif |
| 48 | |
| 49 | #include <netinet/in.h> |
| 50 | #include <netinet/ip.h> |
| 51 | #include <arpa/inet.h> |
| 52 | |
| 53 | #include <errno.h> |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 54 | #include <netdb.h> |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 55 | #include <stdarg.h> |
| 56 | #include <stdio.h> |
| 57 | #include <stdlib.h> |
| 58 | #include <string.h> |
| 59 | #include <unistd.h> |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 60 | #include <limits.h> |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 61 | #include <signal.h> |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 62 | #include <time.h> |
| 63 | |
| 64 | #include <zlib.h> |
| 65 | |
| 66 | #include "buffer.h" /* typedefs XXX */ |
| 67 | #include "key.h" /* typedefs XXX */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 68 | |
| 69 | #include "xmalloc.h" |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 70 | #include "crc32.h" |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 71 | #include "deattack.h" |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 72 | #include "compat.h" |
| 73 | #include "ssh1.h" |
| 74 | #include "ssh2.h" |
| 75 | #include "cipher.h" |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 76 | #include "sshkey.h" |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 77 | #include "kex.h" |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 78 | #include "digest.h" |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 79 | #include "mac.h" |
| 80 | #include "log.h" |
| 81 | #include "canohost.h" |
| 82 | #include "misc.h" |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 83 | #include "channels.h" |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 84 | #include "ssh.h" |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 85 | #include "packet.h" |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 86 | #include "ssherr.h" |
| 87 | #include "sshbuf.h" |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 88 | |
| 89 | #ifdef PACKET_DEBUG |
| 90 | #define DBG(x) x |
| 91 | #else |
| 92 | #define DBG(x) |
| 93 | #endif |
| 94 | |
| 95 | #define PACKET_MAX_SIZE (256 * 1024) |
| 96 | |
| 97 | struct packet_state { |
| 98 | u_int32_t seqnr; |
| 99 | u_int32_t packets; |
| 100 | u_int64_t blocks; |
| 101 | u_int64_t bytes; |
| 102 | }; |
| 103 | |
| 104 | struct packet { |
| 105 | TAILQ_ENTRY(packet) next; |
| 106 | u_char type; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 107 | struct sshbuf *payload; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 108 | }; |
| 109 | |
| 110 | struct session_state { |
| 111 | /* |
| 112 | * This variable contains the file descriptors used for |
| 113 | * communicating with the other side. connection_in is used for |
| 114 | * reading; connection_out for writing. These can be the same |
| 115 | * descriptor, in which case it is assumed to be a socket. |
| 116 | */ |
| 117 | int connection_in; |
| 118 | int connection_out; |
| 119 | |
| 120 | /* Protocol flags for the remote side. */ |
| 121 | u_int remote_protocol_flags; |
| 122 | |
| 123 | /* Encryption context for receiving data. Only used for decryption. */ |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 124 | struct sshcipher_ctx *receive_context; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 125 | |
| 126 | /* Encryption context for sending data. Only used for encryption. */ |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 127 | struct sshcipher_ctx *send_context; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 128 | |
| 129 | /* Buffer for raw input data from the socket. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 130 | struct sshbuf *input; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 131 | |
| 132 | /* Buffer for raw output data going to the socket. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 133 | struct sshbuf *output; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 134 | |
| 135 | /* Buffer for the partial outgoing packet being constructed. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 136 | struct sshbuf *outgoing_packet; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 137 | |
| 138 | /* Buffer for the incoming packet currently being processed. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 139 | struct sshbuf *incoming_packet; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 140 | |
| 141 | /* Scratch buffer for packet compression/decompression. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 142 | struct sshbuf *compression_buffer; |
| 143 | |
| 144 | /* Incoming/outgoing compression dictionaries */ |
| 145 | z_stream compression_in_stream; |
| 146 | z_stream compression_out_stream; |
| 147 | int compression_in_started; |
| 148 | int compression_out_started; |
| 149 | int compression_in_failures; |
| 150 | int compression_out_failures; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 151 | |
| 152 | /* |
| 153 | * Flag indicating whether packet compression/decompression is |
| 154 | * enabled. |
| 155 | */ |
| 156 | int packet_compression; |
| 157 | |
| 158 | /* default maximum packet size */ |
| 159 | u_int max_packet_size; |
| 160 | |
| 161 | /* Flag indicating whether this module has been initialized. */ |
| 162 | int initialized; |
| 163 | |
| 164 | /* Set to true if the connection is interactive. */ |
| 165 | int interactive_mode; |
| 166 | |
| 167 | /* Set to true if we are the server side. */ |
| 168 | int server_side; |
| 169 | |
| 170 | /* Set to true if we are authenticated. */ |
| 171 | int after_authentication; |
| 172 | |
| 173 | int keep_alive_timeouts; |
| 174 | |
| 175 | /* The maximum time that we will wait to send or receive a packet */ |
| 176 | int packet_timeout_ms; |
| 177 | |
| 178 | /* Session key information for Encryption and MAC */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 179 | struct newkeys *newkeys[MODE_MAX]; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 180 | struct packet_state p_read, p_send; |
| 181 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 182 | /* Volume-based rekeying */ |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 183 | u_int64_t max_blocks_in, max_blocks_out, rekey_limit; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 184 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 185 | /* Time-based rekeying */ |
| 186 | u_int32_t rekey_interval; /* how often in seconds */ |
| 187 | time_t rekey_time; /* time of last rekeying */ |
| 188 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 189 | /* Session key for protocol v1 */ |
| 190 | u_char ssh1_key[SSH_SESSION_KEY_LENGTH]; |
| 191 | u_int ssh1_keylen; |
| 192 | |
| 193 | /* roundup current message to extra_pad bytes */ |
| 194 | u_char extra_pad; |
| 195 | |
| 196 | /* XXX discard incoming data after MAC error */ |
| 197 | u_int packet_discard; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 198 | size_t packet_discard_mac_already; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 199 | struct sshmac *packet_discard_mac; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 200 | |
| 201 | /* Used in packet_read_poll2() */ |
| 202 | u_int packlen; |
| 203 | |
| 204 | /* Used in packet_send2 */ |
| 205 | int rekeying; |
| 206 | |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 207 | /* Used in ssh_packet_send_mux() */ |
| 208 | int mux; |
| 209 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 210 | /* Used in packet_set_interactive */ |
| 211 | int set_interactive_called; |
| 212 | |
| 213 | /* Used in packet_set_maxsize */ |
| 214 | int set_maxsize_called; |
| 215 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 216 | /* One-off warning about weak ciphers */ |
| 217 | int cipher_warning_done; |
| 218 | |
| 219 | /* SSH1 CRC compensation attack detector */ |
| 220 | struct deattack_ctx deattack; |
| 221 | |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 222 | /* Hook for fuzzing inbound packets */ |
| 223 | ssh_packet_hook_fn *hook_in; |
| 224 | void *hook_in_ctx; |
| 225 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 226 | TAILQ_HEAD(, packet) outgoing; |
| 227 | }; |
| 228 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 229 | struct ssh * |
| 230 | ssh_alloc_session_state(void) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 231 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 232 | struct ssh *ssh = NULL; |
| 233 | struct session_state *state = NULL; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 234 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 235 | if ((ssh = calloc(1, sizeof(*ssh))) == NULL || |
| 236 | (state = calloc(1, sizeof(*state))) == NULL || |
| 237 | (state->input = sshbuf_new()) == NULL || |
| 238 | (state->output = sshbuf_new()) == NULL || |
| 239 | (state->outgoing_packet = sshbuf_new()) == NULL || |
| 240 | (state->incoming_packet = sshbuf_new()) == NULL) |
| 241 | goto fail; |
| 242 | TAILQ_INIT(&state->outgoing); |
| 243 | TAILQ_INIT(&ssh->private_keys); |
| 244 | TAILQ_INIT(&ssh->public_keys); |
| 245 | state->connection_in = -1; |
| 246 | state->connection_out = -1; |
| 247 | state->max_packet_size = 32768; |
| 248 | state->packet_timeout_ms = -1; |
| 249 | state->p_send.packets = state->p_read.packets = 0; |
| 250 | state->initialized = 1; |
| 251 | /* |
| 252 | * ssh_packet_send2() needs to queue packets until |
| 253 | * we've done the initial key exchange. |
| 254 | */ |
| 255 | state->rekeying = 1; |
| 256 | ssh->state = state; |
| 257 | return ssh; |
| 258 | fail: |
| 259 | if (state) { |
| 260 | sshbuf_free(state->input); |
| 261 | sshbuf_free(state->output); |
| 262 | sshbuf_free(state->incoming_packet); |
| 263 | sshbuf_free(state->outgoing_packet); |
| 264 | free(state); |
| 265 | } |
| 266 | free(ssh); |
| 267 | return NULL; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 268 | } |
| 269 | |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 270 | void |
| 271 | ssh_packet_set_input_hook(struct ssh *ssh, ssh_packet_hook_fn *hook, void *ctx) |
| 272 | { |
| 273 | ssh->state->hook_in = hook; |
| 274 | ssh->state->hook_in_ctx = ctx; |
| 275 | } |
| 276 | |
| 277 | /* Returns nonzero if rekeying is in progress */ |
| 278 | int |
| 279 | ssh_packet_is_rekeying(struct ssh *ssh) |
| 280 | { |
| 281 | return compat20 && |
| 282 | (ssh->state->rekeying || (ssh->kex != NULL && ssh->kex->done == 0)); |
| 283 | } |
| 284 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 285 | /* |
| 286 | * Sets the descriptors used for communication. Disables encryption until |
| 287 | * packet_set_encryption_key is called. |
| 288 | */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 289 | struct ssh * |
| 290 | ssh_packet_set_connection(struct ssh *ssh, int fd_in, int fd_out) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 291 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 292 | struct session_state *state; |
| 293 | const struct sshcipher *none = cipher_by_name("none"); |
| 294 | int r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 295 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 296 | if (none == NULL) { |
| 297 | error("%s: cannot load cipher 'none'", __func__); |
| 298 | return NULL; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 299 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 300 | if (ssh == NULL) |
| 301 | ssh = ssh_alloc_session_state(); |
| 302 | if (ssh == NULL) { |
| 303 | error("%s: cound not allocate state", __func__); |
| 304 | return NULL; |
| 305 | } |
| 306 | state = ssh->state; |
| 307 | state->connection_in = fd_in; |
| 308 | state->connection_out = fd_out; |
| 309 | if ((r = cipher_init(&state->send_context, none, |
| 310 | (const u_char *)"", 0, NULL, 0, CIPHER_ENCRYPT)) != 0 || |
| 311 | (r = cipher_init(&state->receive_context, none, |
| 312 | (const u_char *)"", 0, NULL, 0, CIPHER_DECRYPT)) != 0) { |
| 313 | error("%s: cipher_init failed: %s", __func__, ssh_err(r)); |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 314 | free(ssh); /* XXX need ssh_free_session_state? */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 315 | return NULL; |
| 316 | } |
| 317 | state->newkeys[MODE_IN] = state->newkeys[MODE_OUT] = NULL; |
| 318 | deattack_init(&state->deattack); |
| 319 | /* |
| 320 | * Cache the IP address of the remote connection for use in error |
| 321 | * messages that might be generated after the connection has closed. |
| 322 | */ |
| 323 | (void)ssh_remote_ipaddr(ssh); |
| 324 | return ssh; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 325 | } |
| 326 | |
| 327 | void |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 328 | ssh_packet_set_timeout(struct ssh *ssh, int timeout, int count) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 329 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 330 | struct session_state *state = ssh->state; |
| 331 | |
| 332 | if (timeout <= 0 || count <= 0) { |
| 333 | state->packet_timeout_ms = -1; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 334 | return; |
| 335 | } |
| 336 | if ((INT_MAX / 1000) / count < timeout) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 337 | state->packet_timeout_ms = INT_MAX; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 338 | else |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 339 | state->packet_timeout_ms = timeout * count * 1000; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 340 | } |
| 341 | |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 342 | void |
| 343 | ssh_packet_set_mux(struct ssh *ssh) |
| 344 | { |
| 345 | ssh->state->mux = 1; |
| 346 | ssh->state->rekeying = 0; |
| 347 | } |
| 348 | |
| 349 | int |
| 350 | ssh_packet_get_mux(struct ssh *ssh) |
| 351 | { |
| 352 | return ssh->state->mux; |
| 353 | } |
| 354 | |
| 355 | int |
| 356 | ssh_packet_set_log_preamble(struct ssh *ssh, const char *fmt, ...) |
| 357 | { |
| 358 | va_list args; |
| 359 | int r; |
| 360 | |
| 361 | free(ssh->log_preamble); |
| 362 | if (fmt == NULL) |
| 363 | ssh->log_preamble = NULL; |
| 364 | else { |
| 365 | va_start(args, fmt); |
| 366 | r = vasprintf(&ssh->log_preamble, fmt, args); |
| 367 | va_end(args); |
| 368 | if (r < 0 || ssh->log_preamble == NULL) |
| 369 | return SSH_ERR_ALLOC_FAIL; |
| 370 | } |
| 371 | return 0; |
| 372 | } |
| 373 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 374 | int |
| 375 | ssh_packet_stop_discard(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 376 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 377 | struct session_state *state = ssh->state; |
| 378 | int r; |
| 379 | |
| 380 | if (state->packet_discard_mac) { |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 381 | char buf[1024]; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 382 | size_t dlen = PACKET_MAX_SIZE; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 383 | |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 384 | if (dlen > state->packet_discard_mac_already) |
| 385 | dlen -= state->packet_discard_mac_already; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 386 | memset(buf, 'a', sizeof(buf)); |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 387 | while (sshbuf_len(state->incoming_packet) < dlen) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 388 | if ((r = sshbuf_put(state->incoming_packet, buf, |
| 389 | sizeof(buf))) != 0) |
| 390 | return r; |
| 391 | (void) mac_compute(state->packet_discard_mac, |
| 392 | state->p_read.seqnr, |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 393 | sshbuf_ptr(state->incoming_packet), dlen, |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 394 | NULL, 0); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 395 | } |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 396 | logit("Finished discarding for %.200s port %d", |
| 397 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh)); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 398 | return SSH_ERR_MAC_INVALID; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 399 | } |
| 400 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 401 | static int |
| 402 | ssh_packet_start_discard(struct ssh *ssh, struct sshenc *enc, |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 403 | struct sshmac *mac, size_t mac_already, u_int discard) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 404 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 405 | struct session_state *state = ssh->state; |
| 406 | int r; |
| 407 | |
| 408 | if (enc == NULL || !cipher_is_cbc(enc->cipher) || (mac && mac->etm)) { |
| 409 | if ((r = sshpkt_disconnect(ssh, "Packet corrupt")) != 0) |
| 410 | return r; |
| 411 | return SSH_ERR_MAC_INVALID; |
| 412 | } |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 413 | /* |
| 414 | * Record number of bytes over which the mac has already |
| 415 | * been computed in order to minimize timing attacks. |
| 416 | */ |
| 417 | if (mac && mac->enabled) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 418 | state->packet_discard_mac = mac; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 419 | state->packet_discard_mac_already = mac_already; |
| 420 | } |
| 421 | if (sshbuf_len(state->input) >= discard) |
| 422 | return ssh_packet_stop_discard(ssh); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 423 | state->packet_discard = discard - sshbuf_len(state->input); |
| 424 | return 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 425 | } |
| 426 | |
| 427 | /* Returns 1 if remote host is connected via socket, 0 if not. */ |
| 428 | |
| 429 | int |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 430 | ssh_packet_connection_is_on_socket(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 431 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 432 | struct session_state *state = ssh->state; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 433 | struct sockaddr_storage from, to; |
| 434 | socklen_t fromlen, tolen; |
| 435 | |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 436 | if (state->connection_in == -1 || state->connection_out == -1) |
| 437 | return 0; |
| 438 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 439 | /* filedescriptors in and out are the same, so it's a socket */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 440 | if (state->connection_in == state->connection_out) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 441 | return 1; |
| 442 | fromlen = sizeof(from); |
| 443 | memset(&from, 0, sizeof(from)); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 444 | if (getpeername(state->connection_in, (struct sockaddr *)&from, |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 445 | &fromlen) < 0) |
| 446 | return 0; |
| 447 | tolen = sizeof(to); |
| 448 | memset(&to, 0, sizeof(to)); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 449 | if (getpeername(state->connection_out, (struct sockaddr *)&to, |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 450 | &tolen) < 0) |
| 451 | return 0; |
| 452 | if (fromlen != tolen || memcmp(&from, &to, fromlen) != 0) |
| 453 | return 0; |
| 454 | if (from.ss_family != AF_INET && from.ss_family != AF_INET6) |
| 455 | return 0; |
| 456 | return 1; |
| 457 | } |
| 458 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 459 | void |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 460 | ssh_packet_get_bytes(struct ssh *ssh, u_int64_t *ibytes, u_int64_t *obytes) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 461 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 462 | if (ibytes) |
| 463 | *ibytes = ssh->state->p_read.bytes; |
| 464 | if (obytes) |
| 465 | *obytes = ssh->state->p_send.bytes; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 466 | } |
| 467 | |
| 468 | int |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 469 | ssh_packet_connection_af(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 470 | { |
| 471 | struct sockaddr_storage to; |
| 472 | socklen_t tolen = sizeof(to); |
| 473 | |
| 474 | memset(&to, 0, sizeof(to)); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 475 | if (getsockname(ssh->state->connection_out, (struct sockaddr *)&to, |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 476 | &tolen) < 0) |
| 477 | return 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 478 | #ifdef IPV4_IN_IPV6 |
| 479 | if (to.ss_family == AF_INET6 && |
| 480 | IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&to)->sin6_addr)) |
| 481 | return AF_INET; |
| 482 | #endif |
| 483 | return to.ss_family; |
| 484 | } |
| 485 | |
| 486 | /* Sets the connection into non-blocking mode. */ |
| 487 | |
| 488 | void |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 489 | ssh_packet_set_nonblocking(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 490 | { |
| 491 | /* Set the socket into non-blocking mode. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 492 | set_nonblock(ssh->state->connection_in); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 493 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 494 | if (ssh->state->connection_out != ssh->state->connection_in) |
| 495 | set_nonblock(ssh->state->connection_out); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 496 | } |
| 497 | |
| 498 | /* Returns the socket used for reading. */ |
| 499 | |
| 500 | int |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 501 | ssh_packet_get_connection_in(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 502 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 503 | return ssh->state->connection_in; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 504 | } |
| 505 | |
| 506 | /* Returns the descriptor used for writing. */ |
| 507 | |
| 508 | int |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 509 | ssh_packet_get_connection_out(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 510 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 511 | return ssh->state->connection_out; |
| 512 | } |
| 513 | |
| 514 | /* |
| 515 | * Returns the IP-address of the remote host as a string. The returned |
| 516 | * string must not be freed. |
| 517 | */ |
| 518 | |
| 519 | const char * |
| 520 | ssh_remote_ipaddr(struct ssh *ssh) |
| 521 | { |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 522 | const int sock = ssh->state->connection_in; |
| 523 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 524 | /* Check whether we have cached the ipaddr. */ |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 525 | if (ssh->remote_ipaddr == NULL) { |
| 526 | if (ssh_packet_connection_is_on_socket(ssh)) { |
| 527 | ssh->remote_ipaddr = get_peer_ipaddr(sock); |
| 528 | ssh->remote_port = get_peer_port(sock); |
| 529 | ssh->local_ipaddr = get_local_ipaddr(sock); |
| 530 | ssh->local_port = get_local_port(sock); |
| 531 | } else { |
| 532 | ssh->remote_ipaddr = strdup("UNKNOWN"); |
| 533 | ssh->remote_port = 65535; |
| 534 | ssh->local_ipaddr = strdup("UNKNOWN"); |
| 535 | ssh->local_port = 65535; |
| 536 | } |
| 537 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 538 | return ssh->remote_ipaddr; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 539 | } |
| 540 | |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 541 | /* Returns the port number of the remote host. */ |
| 542 | |
| 543 | int |
| 544 | ssh_remote_port(struct ssh *ssh) |
| 545 | { |
| 546 | (void)ssh_remote_ipaddr(ssh); /* Will lookup and cache. */ |
| 547 | return ssh->remote_port; |
| 548 | } |
| 549 | |
| 550 | /* |
| 551 | * Returns the IP-address of the local host as a string. The returned |
| 552 | * string must not be freed. |
| 553 | */ |
| 554 | |
| 555 | const char * |
| 556 | ssh_local_ipaddr(struct ssh *ssh) |
| 557 | { |
| 558 | (void)ssh_remote_ipaddr(ssh); /* Will lookup and cache. */ |
| 559 | return ssh->local_ipaddr; |
| 560 | } |
| 561 | |
| 562 | /* Returns the port number of the local host. */ |
| 563 | |
| 564 | int |
| 565 | ssh_local_port(struct ssh *ssh) |
| 566 | { |
| 567 | (void)ssh_remote_ipaddr(ssh); /* Will lookup and cache. */ |
| 568 | return ssh->local_port; |
| 569 | } |
| 570 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 571 | /* Closes the connection and clears and frees internal data structures. */ |
| 572 | |
| 573 | void |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 574 | ssh_packet_close(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 575 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 576 | struct session_state *state = ssh->state; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 577 | u_int mode; |
| 578 | |
| 579 | if (!state->initialized) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 580 | return; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 581 | state->initialized = 0; |
| 582 | if (state->connection_in == state->connection_out) { |
| 583 | shutdown(state->connection_out, SHUT_RDWR); |
| 584 | close(state->connection_out); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 585 | } else { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 586 | close(state->connection_in); |
| 587 | close(state->connection_out); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 588 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 589 | sshbuf_free(state->input); |
| 590 | sshbuf_free(state->output); |
| 591 | sshbuf_free(state->outgoing_packet); |
| 592 | sshbuf_free(state->incoming_packet); |
| 593 | for (mode = 0; mode < MODE_MAX; mode++) |
| 594 | kex_free_newkeys(state->newkeys[mode]); |
| 595 | if (state->compression_buffer) { |
| 596 | sshbuf_free(state->compression_buffer); |
| 597 | if (state->compression_out_started) { |
| 598 | z_streamp stream = &state->compression_out_stream; |
| 599 | debug("compress outgoing: " |
| 600 | "raw data %llu, compressed %llu, factor %.2f", |
| 601 | (unsigned long long)stream->total_in, |
| 602 | (unsigned long long)stream->total_out, |
| 603 | stream->total_in == 0 ? 0.0 : |
| 604 | (double) stream->total_out / stream->total_in); |
| 605 | if (state->compression_out_failures == 0) |
| 606 | deflateEnd(stream); |
| 607 | } |
| 608 | if (state->compression_in_started) { |
| 609 | z_streamp stream = &state->compression_out_stream; |
| 610 | debug("compress incoming: " |
| 611 | "raw data %llu, compressed %llu, factor %.2f", |
| 612 | (unsigned long long)stream->total_out, |
| 613 | (unsigned long long)stream->total_in, |
| 614 | stream->total_out == 0 ? 0.0 : |
| 615 | (double) stream->total_in / stream->total_out); |
| 616 | if (state->compression_in_failures == 0) |
| 617 | inflateEnd(stream); |
| 618 | } |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 619 | } |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 620 | cipher_free(state->send_context); |
| 621 | cipher_free(state->receive_context); |
| 622 | state->send_context = state->receive_context = NULL; |
| 623 | free(ssh->remote_ipaddr); |
| 624 | ssh->remote_ipaddr = NULL; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 625 | free(ssh->state); |
| 626 | ssh->state = NULL; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 627 | } |
| 628 | |
| 629 | /* Sets remote side protocol flags. */ |
| 630 | |
| 631 | void |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 632 | ssh_packet_set_protocol_flags(struct ssh *ssh, u_int protocol_flags) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 633 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 634 | ssh->state->remote_protocol_flags = protocol_flags; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 635 | } |
| 636 | |
| 637 | /* Returns the remote protocol flags set earlier by the above function. */ |
| 638 | |
| 639 | u_int |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 640 | ssh_packet_get_protocol_flags(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 641 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 642 | return ssh->state->remote_protocol_flags; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 643 | } |
| 644 | |
| 645 | /* |
| 646 | * Starts packet compression from the next packet on in both directions. |
| 647 | * Level is compression level 1 (fastest) - 9 (slow, best) as in gzip. |
| 648 | */ |
| 649 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 650 | static int |
| 651 | ssh_packet_init_compression(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 652 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 653 | if (!ssh->state->compression_buffer && |
| 654 | ((ssh->state->compression_buffer = sshbuf_new()) == NULL)) |
| 655 | return SSH_ERR_ALLOC_FAIL; |
| 656 | return 0; |
| 657 | } |
| 658 | |
| 659 | static int |
| 660 | start_compression_out(struct ssh *ssh, int level) |
| 661 | { |
| 662 | if (level < 1 || level > 9) |
| 663 | return SSH_ERR_INVALID_ARGUMENT; |
| 664 | debug("Enabling compression at level %d.", level); |
| 665 | if (ssh->state->compression_out_started == 1) |
| 666 | deflateEnd(&ssh->state->compression_out_stream); |
| 667 | switch (deflateInit(&ssh->state->compression_out_stream, level)) { |
| 668 | case Z_OK: |
| 669 | ssh->state->compression_out_started = 1; |
| 670 | break; |
| 671 | case Z_MEM_ERROR: |
| 672 | return SSH_ERR_ALLOC_FAIL; |
| 673 | default: |
| 674 | return SSH_ERR_INTERNAL_ERROR; |
| 675 | } |
| 676 | return 0; |
| 677 | } |
| 678 | |
| 679 | static int |
| 680 | start_compression_in(struct ssh *ssh) |
| 681 | { |
| 682 | if (ssh->state->compression_in_started == 1) |
| 683 | inflateEnd(&ssh->state->compression_in_stream); |
| 684 | switch (inflateInit(&ssh->state->compression_in_stream)) { |
| 685 | case Z_OK: |
| 686 | ssh->state->compression_in_started = 1; |
| 687 | break; |
| 688 | case Z_MEM_ERROR: |
| 689 | return SSH_ERR_ALLOC_FAIL; |
| 690 | default: |
| 691 | return SSH_ERR_INTERNAL_ERROR; |
| 692 | } |
| 693 | return 0; |
| 694 | } |
| 695 | |
| 696 | int |
| 697 | ssh_packet_start_compression(struct ssh *ssh, int level) |
| 698 | { |
| 699 | int r; |
| 700 | |
| 701 | if (ssh->state->packet_compression && !compat20) |
| 702 | return SSH_ERR_INTERNAL_ERROR; |
| 703 | ssh->state->packet_compression = 1; |
| 704 | if ((r = ssh_packet_init_compression(ssh)) != 0 || |
| 705 | (r = start_compression_in(ssh)) != 0 || |
| 706 | (r = start_compression_out(ssh, level)) != 0) |
| 707 | return r; |
| 708 | return 0; |
| 709 | } |
| 710 | |
| 711 | /* XXX remove need for separate compression buffer */ |
| 712 | static int |
| 713 | compress_buffer(struct ssh *ssh, struct sshbuf *in, struct sshbuf *out) |
| 714 | { |
| 715 | u_char buf[4096]; |
| 716 | int r, status; |
| 717 | |
| 718 | if (ssh->state->compression_out_started != 1) |
| 719 | return SSH_ERR_INTERNAL_ERROR; |
| 720 | |
| 721 | /* This case is not handled below. */ |
| 722 | if (sshbuf_len(in) == 0) |
| 723 | return 0; |
| 724 | |
| 725 | /* Input is the contents of the input buffer. */ |
| 726 | if ((ssh->state->compression_out_stream.next_in = |
| 727 | sshbuf_mutable_ptr(in)) == NULL) |
| 728 | return SSH_ERR_INTERNAL_ERROR; |
| 729 | ssh->state->compression_out_stream.avail_in = sshbuf_len(in); |
| 730 | |
| 731 | /* Loop compressing until deflate() returns with avail_out != 0. */ |
| 732 | do { |
| 733 | /* Set up fixed-size output buffer. */ |
| 734 | ssh->state->compression_out_stream.next_out = buf; |
| 735 | ssh->state->compression_out_stream.avail_out = sizeof(buf); |
| 736 | |
| 737 | /* Compress as much data into the buffer as possible. */ |
| 738 | status = deflate(&ssh->state->compression_out_stream, |
| 739 | Z_PARTIAL_FLUSH); |
| 740 | switch (status) { |
| 741 | case Z_MEM_ERROR: |
| 742 | return SSH_ERR_ALLOC_FAIL; |
| 743 | case Z_OK: |
| 744 | /* Append compressed data to output_buffer. */ |
| 745 | if ((r = sshbuf_put(out, buf, sizeof(buf) - |
| 746 | ssh->state->compression_out_stream.avail_out)) != 0) |
| 747 | return r; |
| 748 | break; |
| 749 | case Z_STREAM_ERROR: |
| 750 | default: |
| 751 | ssh->state->compression_out_failures++; |
| 752 | return SSH_ERR_INVALID_FORMAT; |
| 753 | } |
| 754 | } while (ssh->state->compression_out_stream.avail_out == 0); |
| 755 | return 0; |
| 756 | } |
| 757 | |
| 758 | static int |
| 759 | uncompress_buffer(struct ssh *ssh, struct sshbuf *in, struct sshbuf *out) |
| 760 | { |
| 761 | u_char buf[4096]; |
| 762 | int r, status; |
| 763 | |
| 764 | if (ssh->state->compression_in_started != 1) |
| 765 | return SSH_ERR_INTERNAL_ERROR; |
| 766 | |
| 767 | if ((ssh->state->compression_in_stream.next_in = |
| 768 | sshbuf_mutable_ptr(in)) == NULL) |
| 769 | return SSH_ERR_INTERNAL_ERROR; |
| 770 | ssh->state->compression_in_stream.avail_in = sshbuf_len(in); |
| 771 | |
| 772 | for (;;) { |
| 773 | /* Set up fixed-size output buffer. */ |
| 774 | ssh->state->compression_in_stream.next_out = buf; |
| 775 | ssh->state->compression_in_stream.avail_out = sizeof(buf); |
| 776 | |
| 777 | status = inflate(&ssh->state->compression_in_stream, |
| 778 | Z_PARTIAL_FLUSH); |
| 779 | switch (status) { |
| 780 | case Z_OK: |
| 781 | if ((r = sshbuf_put(out, buf, sizeof(buf) - |
| 782 | ssh->state->compression_in_stream.avail_out)) != 0) |
| 783 | return r; |
| 784 | break; |
| 785 | case Z_BUF_ERROR: |
| 786 | /* |
| 787 | * Comments in zlib.h say that we should keep calling |
| 788 | * inflate() until we get an error. This appears to |
| 789 | * be the error that we get. |
| 790 | */ |
| 791 | return 0; |
| 792 | case Z_DATA_ERROR: |
| 793 | return SSH_ERR_INVALID_FORMAT; |
| 794 | case Z_MEM_ERROR: |
| 795 | return SSH_ERR_ALLOC_FAIL; |
| 796 | case Z_STREAM_ERROR: |
| 797 | default: |
| 798 | ssh->state->compression_in_failures++; |
| 799 | return SSH_ERR_INTERNAL_ERROR; |
| 800 | } |
| 801 | } |
| 802 | /* NOTREACHED */ |
| 803 | } |
| 804 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 805 | /* |
| 806 | * Causes any further packets to be encrypted using the given key. The same |
| 807 | * key is used for both sending and reception. However, both directions are |
| 808 | * encrypted independently of each other. |
| 809 | */ |
| 810 | |
| 811 | void |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 812 | ssh_packet_set_encryption_key(struct ssh *ssh, const u_char *key, u_int keylen, int number) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 813 | { |
Greg Hartman | ccacbc9 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 814 | #ifndef WITH_SSH1 |
| 815 | fatal("no SSH protocol 1 support"); |
| 816 | #else /* WITH_SSH1 */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 817 | struct session_state *state = ssh->state; |
| 818 | const struct sshcipher *cipher = cipher_by_number(number); |
| 819 | int r; |
| 820 | const char *wmsg; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 821 | |
| 822 | if (cipher == NULL) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 823 | fatal("%s: unknown cipher number %d", __func__, number); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 824 | if (keylen < 20) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 825 | fatal("%s: keylen too small: %d", __func__, keylen); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 826 | if (keylen > SSH_SESSION_KEY_LENGTH) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 827 | fatal("%s: keylen too big: %d", __func__, keylen); |
| 828 | memcpy(state->ssh1_key, key, keylen); |
| 829 | state->ssh1_keylen = keylen; |
| 830 | if ((r = cipher_init(&state->send_context, cipher, key, keylen, |
| 831 | NULL, 0, CIPHER_ENCRYPT)) != 0 || |
| 832 | (r = cipher_init(&state->receive_context, cipher, key, keylen, |
| 833 | NULL, 0, CIPHER_DECRYPT) != 0)) |
| 834 | fatal("%s: cipher_init failed: %s", __func__, ssh_err(r)); |
| 835 | if (!state->cipher_warning_done && |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 836 | ((wmsg = cipher_warning_message(state->send_context)) != NULL || |
| 837 | (wmsg = cipher_warning_message(state->send_context)) != NULL)) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 838 | error("Warning: %s", wmsg); |
| 839 | state->cipher_warning_done = 1; |
| 840 | } |
| 841 | #endif /* WITH_SSH1 */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 842 | } |
| 843 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 844 | /* |
| 845 | * Finalizes and sends the packet. If the encryption key has been set, |
| 846 | * encrypts the packet before sending. |
| 847 | */ |
| 848 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 849 | int |
| 850 | ssh_packet_send1(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 851 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 852 | struct session_state *state = ssh->state; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 853 | u_char buf[8], *cp; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 854 | int r, padding, len; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 855 | u_int checksum; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 856 | |
| 857 | /* |
| 858 | * If using packet compression, compress the payload of the outgoing |
| 859 | * packet. |
| 860 | */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 861 | if (state->packet_compression) { |
| 862 | sshbuf_reset(state->compression_buffer); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 863 | /* Skip padding. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 864 | if ((r = sshbuf_consume(state->outgoing_packet, 8)) != 0) |
| 865 | goto out; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 866 | /* padding */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 867 | if ((r = sshbuf_put(state->compression_buffer, |
| 868 | "\0\0\0\0\0\0\0\0", 8)) != 0) |
| 869 | goto out; |
| 870 | if ((r = compress_buffer(ssh, state->outgoing_packet, |
| 871 | state->compression_buffer)) != 0) |
| 872 | goto out; |
| 873 | sshbuf_reset(state->outgoing_packet); |
| 874 | if ((r = sshbuf_putb(state->outgoing_packet, |
| 875 | state->compression_buffer)) != 0) |
| 876 | goto out; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 877 | } |
| 878 | /* Compute packet length without padding (add checksum, remove padding). */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 879 | len = sshbuf_len(state->outgoing_packet) + 4 - 8; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 880 | |
| 881 | /* Insert padding. Initialized to zero in packet_start1() */ |
| 882 | padding = 8 - len % 8; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 883 | if (!cipher_ctx_is_plaintext(state->send_context)) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 884 | cp = sshbuf_mutable_ptr(state->outgoing_packet); |
| 885 | if (cp == NULL) { |
| 886 | r = SSH_ERR_INTERNAL_ERROR; |
| 887 | goto out; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 888 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 889 | arc4random_buf(cp + 8 - padding, padding); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 890 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 891 | if ((r = sshbuf_consume(state->outgoing_packet, 8 - padding)) != 0) |
| 892 | goto out; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 893 | |
| 894 | /* Add check bytes. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 895 | checksum = ssh_crc32(sshbuf_ptr(state->outgoing_packet), |
| 896 | sshbuf_len(state->outgoing_packet)); |
| 897 | POKE_U32(buf, checksum); |
| 898 | if ((r = sshbuf_put(state->outgoing_packet, buf, 4)) != 0) |
| 899 | goto out; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 900 | |
| 901 | #ifdef PACKET_DEBUG |
| 902 | fprintf(stderr, "packet_send plain: "); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 903 | sshbuf_dump(state->outgoing_packet, stderr); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 904 | #endif |
| 905 | |
| 906 | /* Append to output. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 907 | POKE_U32(buf, len); |
| 908 | if ((r = sshbuf_put(state->output, buf, 4)) != 0) |
| 909 | goto out; |
| 910 | if ((r = sshbuf_reserve(state->output, |
| 911 | sshbuf_len(state->outgoing_packet), &cp)) != 0) |
| 912 | goto out; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 913 | if ((r = cipher_crypt(state->send_context, 0, cp, |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 914 | sshbuf_ptr(state->outgoing_packet), |
| 915 | sshbuf_len(state->outgoing_packet), 0, 0)) != 0) |
| 916 | goto out; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 917 | |
| 918 | #ifdef PACKET_DEBUG |
| 919 | fprintf(stderr, "encrypted: "); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 920 | sshbuf_dump(state->output, stderr); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 921 | #endif |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 922 | state->p_send.packets++; |
| 923 | state->p_send.bytes += len + |
| 924 | sshbuf_len(state->outgoing_packet); |
| 925 | sshbuf_reset(state->outgoing_packet); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 926 | |
| 927 | /* |
| 928 | * Note that the packet is now only buffered in output. It won't be |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 929 | * actually sent until ssh_packet_write_wait or ssh_packet_write_poll |
| 930 | * is called. |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 931 | */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 932 | r = 0; |
| 933 | out: |
| 934 | return r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 935 | } |
| 936 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 937 | int |
| 938 | ssh_set_newkeys(struct ssh *ssh, int mode) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 939 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 940 | struct session_state *state = ssh->state; |
| 941 | struct sshenc *enc; |
| 942 | struct sshmac *mac; |
| 943 | struct sshcomp *comp; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 944 | struct sshcipher_ctx **ccp; |
| 945 | struct packet_state *ps; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 946 | u_int64_t *max_blocks; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 947 | const char *wmsg, *dir; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 948 | int r, crypt_type; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 949 | |
| 950 | debug2("set_newkeys: mode %d", mode); |
| 951 | |
| 952 | if (mode == MODE_OUT) { |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 953 | dir = "output"; |
| 954 | ccp = &state->send_context; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 955 | crypt_type = CIPHER_ENCRYPT; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 956 | ps = &state->p_send; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 957 | max_blocks = &state->max_blocks_out; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 958 | } else { |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 959 | dir = "input"; |
| 960 | ccp = &state->receive_context; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 961 | crypt_type = CIPHER_DECRYPT; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 962 | ps = &state->p_read; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 963 | max_blocks = &state->max_blocks_in; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 964 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 965 | if (state->newkeys[mode] != NULL) { |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 966 | debug("%s: rekeying after %llu %s blocks" |
| 967 | " (%llu bytes total)", __func__, |
| 968 | (unsigned long long)ps->blocks, dir, |
| 969 | (unsigned long long)ps->bytes); |
| 970 | cipher_free(*ccp); |
| 971 | *ccp = NULL; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 972 | enc = &state->newkeys[mode]->enc; |
| 973 | mac = &state->newkeys[mode]->mac; |
| 974 | comp = &state->newkeys[mode]->comp; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 975 | mac_clear(mac); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 976 | explicit_bzero(enc->iv, enc->iv_len); |
| 977 | explicit_bzero(enc->key, enc->key_len); |
| 978 | explicit_bzero(mac->key, mac->key_len); |
| 979 | free(enc->name); |
| 980 | free(enc->iv); |
| 981 | free(enc->key); |
| 982 | free(mac->name); |
| 983 | free(mac->key); |
| 984 | free(comp->name); |
| 985 | free(state->newkeys[mode]); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 986 | } |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 987 | /* note that both bytes and the seqnr are not reset */ |
| 988 | ps->packets = ps->blocks = 0; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 989 | /* move newkeys from kex to state */ |
| 990 | if ((state->newkeys[mode] = ssh->kex->newkeys[mode]) == NULL) |
| 991 | return SSH_ERR_INTERNAL_ERROR; |
| 992 | ssh->kex->newkeys[mode] = NULL; |
| 993 | enc = &state->newkeys[mode]->enc; |
| 994 | mac = &state->newkeys[mode]->mac; |
| 995 | comp = &state->newkeys[mode]->comp; |
| 996 | if (cipher_authlen(enc->cipher) == 0) { |
| 997 | if ((r = mac_init(mac)) != 0) |
| 998 | return r; |
| 999 | } |
| 1000 | mac->enabled = 1; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1001 | DBG(debug("cipher_init_context: %d", mode)); |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1002 | if ((r = cipher_init(ccp, enc->cipher, enc->key, enc->key_len, |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1003 | enc->iv, enc->iv_len, crypt_type)) != 0) |
| 1004 | return r; |
| 1005 | if (!state->cipher_warning_done && |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1006 | (wmsg = cipher_warning_message(*ccp)) != NULL) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1007 | error("Warning: %s", wmsg); |
| 1008 | state->cipher_warning_done = 1; |
| 1009 | } |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1010 | /* Deleting the keys does not gain extra security */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1011 | /* explicit_bzero(enc->iv, enc->block_size); |
| 1012 | explicit_bzero(enc->key, enc->key_len); |
| 1013 | explicit_bzero(mac->key, mac->key_len); */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1014 | if ((comp->type == COMP_ZLIB || |
| 1015 | (comp->type == COMP_DELAYED && |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1016 | state->after_authentication)) && comp->enabled == 0) { |
| 1017 | if ((r = ssh_packet_init_compression(ssh)) < 0) |
| 1018 | return r; |
| 1019 | if (mode == MODE_OUT) { |
| 1020 | if ((r = start_compression_out(ssh, 6)) != 0) |
| 1021 | return r; |
| 1022 | } else { |
| 1023 | if ((r = start_compression_in(ssh)) != 0) |
| 1024 | return r; |
| 1025 | } |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1026 | comp->enabled = 1; |
| 1027 | } |
| 1028 | /* |
| 1029 | * The 2^(blocksize*2) limit is too expensive for 3DES, |
| 1030 | * blowfish, etc, so enforce a 1GB limit for small blocksizes. |
| 1031 | */ |
| 1032 | if (enc->block_size >= 16) |
| 1033 | *max_blocks = (u_int64_t)1 << (enc->block_size*2); |
| 1034 | else |
| 1035 | *max_blocks = ((u_int64_t)1 << 30) / enc->block_size; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1036 | if (state->rekey_limit) |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1037 | *max_blocks = MINIMUM(*max_blocks, |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1038 | state->rekey_limit / enc->block_size); |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1039 | debug("rekey after %llu blocks", (unsigned long long)*max_blocks); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1040 | return 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1041 | } |
| 1042 | |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1043 | #define MAX_PACKETS (1U<<31) |
| 1044 | static int |
| 1045 | ssh_packet_need_rekeying(struct ssh *ssh, u_int outbound_packet_len) |
| 1046 | { |
| 1047 | struct session_state *state = ssh->state; |
| 1048 | u_int32_t out_blocks; |
| 1049 | |
| 1050 | /* XXX client can't cope with rekeying pre-auth */ |
| 1051 | if (!state->after_authentication) |
| 1052 | return 0; |
| 1053 | |
| 1054 | /* Haven't keyed yet or KEX in progress. */ |
| 1055 | if (ssh->kex == NULL || ssh_packet_is_rekeying(ssh)) |
| 1056 | return 0; |
| 1057 | |
| 1058 | /* Peer can't rekey */ |
| 1059 | if (ssh->compat & SSH_BUG_NOREKEY) |
| 1060 | return 0; |
| 1061 | |
| 1062 | /* |
| 1063 | * Permit one packet in or out per rekey - this allows us to |
| 1064 | * make progress when rekey limits are very small. |
| 1065 | */ |
| 1066 | if (state->p_send.packets == 0 && state->p_read.packets == 0) |
| 1067 | return 0; |
| 1068 | |
| 1069 | /* Time-based rekeying */ |
| 1070 | if (state->rekey_interval != 0 && |
| 1071 | (int64_t)state->rekey_time + state->rekey_interval <= monotime()) |
| 1072 | return 1; |
| 1073 | |
| 1074 | /* Always rekey when MAX_PACKETS sent in either direction */ |
| 1075 | if (state->p_send.packets > MAX_PACKETS || |
| 1076 | state->p_read.packets > MAX_PACKETS) |
| 1077 | return 1; |
| 1078 | |
| 1079 | /* Rekey after (cipher-specific) maxiumum blocks */ |
| 1080 | out_blocks = ROUNDUP(outbound_packet_len, |
| 1081 | state->newkeys[MODE_OUT]->enc.block_size); |
| 1082 | return (state->max_blocks_out && |
| 1083 | (state->p_send.blocks + out_blocks > state->max_blocks_out)) || |
| 1084 | (state->max_blocks_in && |
| 1085 | (state->p_read.blocks > state->max_blocks_in)); |
| 1086 | } |
| 1087 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1088 | /* |
| 1089 | * Delayed compression for SSH2 is enabled after authentication: |
| 1090 | * This happens on the server side after a SSH2_MSG_USERAUTH_SUCCESS is sent, |
| 1091 | * and on the client side after a SSH2_MSG_USERAUTH_SUCCESS is received. |
| 1092 | */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1093 | static int |
| 1094 | ssh_packet_enable_delayed_compress(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1095 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1096 | struct session_state *state = ssh->state; |
| 1097 | struct sshcomp *comp = NULL; |
| 1098 | int r, mode; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1099 | |
| 1100 | /* |
| 1101 | * Remember that we are past the authentication step, so rekeying |
| 1102 | * with COMP_DELAYED will turn on compression immediately. |
| 1103 | */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1104 | state->after_authentication = 1; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1105 | for (mode = 0; mode < MODE_MAX; mode++) { |
| 1106 | /* protocol error: USERAUTH_SUCCESS received before NEWKEYS */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1107 | if (state->newkeys[mode] == NULL) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1108 | continue; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1109 | comp = &state->newkeys[mode]->comp; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1110 | if (comp && !comp->enabled && comp->type == COMP_DELAYED) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1111 | if ((r = ssh_packet_init_compression(ssh)) != 0) |
| 1112 | return r; |
| 1113 | if (mode == MODE_OUT) { |
| 1114 | if ((r = start_compression_out(ssh, 6)) != 0) |
| 1115 | return r; |
| 1116 | } else { |
| 1117 | if ((r = start_compression_in(ssh)) != 0) |
| 1118 | return r; |
| 1119 | } |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1120 | comp->enabled = 1; |
| 1121 | } |
| 1122 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1123 | return 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1124 | } |
| 1125 | |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1126 | /* Used to mute debug logging for noisy packet types */ |
| 1127 | int |
| 1128 | ssh_packet_log_type(u_char type) |
| 1129 | { |
| 1130 | switch (type) { |
| 1131 | case SSH2_MSG_CHANNEL_DATA: |
| 1132 | case SSH2_MSG_CHANNEL_EXTENDED_DATA: |
| 1133 | case SSH2_MSG_CHANNEL_WINDOW_ADJUST: |
| 1134 | return 0; |
| 1135 | default: |
| 1136 | return 1; |
| 1137 | } |
| 1138 | } |
| 1139 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1140 | /* |
| 1141 | * Finalize packet in SSH2 format (compress, mac, encrypt, enqueue) |
| 1142 | */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1143 | int |
| 1144 | ssh_packet_send2_wrapped(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1145 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1146 | struct session_state *state = ssh->state; |
| 1147 | u_char type, *cp, macbuf[SSH_DIGEST_MAX_LENGTH]; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1148 | u_char tmp, padlen, pad = 0; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1149 | u_int authlen = 0, aadlen = 0; |
| 1150 | u_int len; |
| 1151 | struct sshenc *enc = NULL; |
| 1152 | struct sshmac *mac = NULL; |
| 1153 | struct sshcomp *comp = NULL; |
| 1154 | int r, block_size; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1155 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1156 | if (state->newkeys[MODE_OUT] != NULL) { |
| 1157 | enc = &state->newkeys[MODE_OUT]->enc; |
| 1158 | mac = &state->newkeys[MODE_OUT]->mac; |
| 1159 | comp = &state->newkeys[MODE_OUT]->comp; |
| 1160 | /* disable mac for authenticated encryption */ |
| 1161 | if ((authlen = cipher_authlen(enc->cipher)) != 0) |
| 1162 | mac = NULL; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1163 | } |
| 1164 | block_size = enc ? enc->block_size : 8; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1165 | aadlen = (mac && mac->enabled && mac->etm) || authlen ? 4 : 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1166 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1167 | type = (sshbuf_ptr(state->outgoing_packet))[5]; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1168 | if (ssh_packet_log_type(type)) |
| 1169 | debug3("send packet: type %u", type); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1170 | #ifdef PACKET_DEBUG |
| 1171 | fprintf(stderr, "plain: "); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1172 | sshbuf_dump(state->outgoing_packet, stderr); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1173 | #endif |
| 1174 | |
| 1175 | if (comp && comp->enabled) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1176 | len = sshbuf_len(state->outgoing_packet); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1177 | /* skip header, compress only payload */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1178 | if ((r = sshbuf_consume(state->outgoing_packet, 5)) != 0) |
| 1179 | goto out; |
| 1180 | sshbuf_reset(state->compression_buffer); |
| 1181 | if ((r = compress_buffer(ssh, state->outgoing_packet, |
| 1182 | state->compression_buffer)) != 0) |
| 1183 | goto out; |
| 1184 | sshbuf_reset(state->outgoing_packet); |
| 1185 | if ((r = sshbuf_put(state->outgoing_packet, |
| 1186 | "\0\0\0\0\0", 5)) != 0 || |
| 1187 | (r = sshbuf_putb(state->outgoing_packet, |
| 1188 | state->compression_buffer)) != 0) |
| 1189 | goto out; |
| 1190 | DBG(debug("compression: raw %d compressed %zd", len, |
| 1191 | sshbuf_len(state->outgoing_packet))); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1192 | } |
| 1193 | |
| 1194 | /* sizeof (packet_len + pad_len + payload) */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1195 | len = sshbuf_len(state->outgoing_packet); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1196 | |
| 1197 | /* |
| 1198 | * calc size of padding, alloc space, get random data, |
| 1199 | * minimum padding is 4 bytes |
| 1200 | */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1201 | len -= aadlen; /* packet length is not encrypted for EtM modes */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1202 | padlen = block_size - (len % block_size); |
| 1203 | if (padlen < 4) |
| 1204 | padlen += block_size; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1205 | if (state->extra_pad) { |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1206 | tmp = state->extra_pad; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1207 | state->extra_pad = |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1208 | ROUNDUP(state->extra_pad, block_size); |
| 1209 | /* check if roundup overflowed */ |
| 1210 | if (state->extra_pad < tmp) |
| 1211 | return SSH_ERR_INVALID_ARGUMENT; |
| 1212 | tmp = (len + padlen) % state->extra_pad; |
| 1213 | /* Check whether pad calculation below will underflow */ |
| 1214 | if (tmp > state->extra_pad) |
| 1215 | return SSH_ERR_INVALID_ARGUMENT; |
| 1216 | pad = state->extra_pad - tmp; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1217 | DBG(debug3("%s: adding %d (len %d padlen %d extra_pad %d)", |
| 1218 | __func__, pad, len, padlen, state->extra_pad)); |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1219 | tmp = padlen; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1220 | padlen += pad; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1221 | /* Check whether padlen calculation overflowed */ |
| 1222 | if (padlen < tmp) |
| 1223 | return SSH_ERR_INVALID_ARGUMENT; /* overflow */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1224 | state->extra_pad = 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1225 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1226 | if ((r = sshbuf_reserve(state->outgoing_packet, padlen, &cp)) != 0) |
| 1227 | goto out; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1228 | if (enc && !cipher_ctx_is_plaintext(state->send_context)) { |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1229 | /* random padding */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1230 | arc4random_buf(cp, padlen); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1231 | } else { |
| 1232 | /* clear padding */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1233 | explicit_bzero(cp, padlen); |
| 1234 | } |
| 1235 | /* sizeof (packet_len + pad_len + payload + padding) */ |
| 1236 | len = sshbuf_len(state->outgoing_packet); |
| 1237 | cp = sshbuf_mutable_ptr(state->outgoing_packet); |
| 1238 | if (cp == NULL) { |
| 1239 | r = SSH_ERR_INTERNAL_ERROR; |
| 1240 | goto out; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1241 | } |
| 1242 | /* packet_length includes payload, padding and padding length field */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1243 | POKE_U32(cp, len - 4); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1244 | cp[4] = padlen; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1245 | DBG(debug("send: len %d (includes padlen %d, aadlen %d)", |
| 1246 | len, padlen, aadlen)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1247 | |
| 1248 | /* compute MAC over seqnr and packet(length fields, payload, padding) */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1249 | if (mac && mac->enabled && !mac->etm) { |
| 1250 | if ((r = mac_compute(mac, state->p_send.seqnr, |
| 1251 | sshbuf_ptr(state->outgoing_packet), len, |
| 1252 | macbuf, sizeof(macbuf))) != 0) |
| 1253 | goto out; |
| 1254 | DBG(debug("done calc MAC out #%d", state->p_send.seqnr)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1255 | } |
| 1256 | /* encrypt packet and append to output buffer. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1257 | if ((r = sshbuf_reserve(state->output, |
| 1258 | sshbuf_len(state->outgoing_packet) + authlen, &cp)) != 0) |
| 1259 | goto out; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1260 | if ((r = cipher_crypt(state->send_context, state->p_send.seqnr, cp, |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1261 | sshbuf_ptr(state->outgoing_packet), |
| 1262 | len - aadlen, aadlen, authlen)) != 0) |
| 1263 | goto out; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1264 | /* append unencrypted MAC */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1265 | if (mac && mac->enabled) { |
| 1266 | if (mac->etm) { |
| 1267 | /* EtM: compute mac over aadlen + cipher text */ |
| 1268 | if ((r = mac_compute(mac, state->p_send.seqnr, |
| 1269 | cp, len, macbuf, sizeof(macbuf))) != 0) |
| 1270 | goto out; |
| 1271 | DBG(debug("done calc MAC(EtM) out #%d", |
| 1272 | state->p_send.seqnr)); |
| 1273 | } |
| 1274 | if ((r = sshbuf_put(state->output, macbuf, mac->mac_len)) != 0) |
| 1275 | goto out; |
| 1276 | } |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1277 | #ifdef PACKET_DEBUG |
| 1278 | fprintf(stderr, "encrypted: "); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1279 | sshbuf_dump(state->output, stderr); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1280 | #endif |
| 1281 | /* increment sequence number for outgoing packets */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1282 | if (++state->p_send.seqnr == 0) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1283 | logit("outgoing seqnr wraps around"); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1284 | if (++state->p_send.packets == 0) |
| 1285 | if (!(ssh->compat & SSH_BUG_NOREKEY)) |
| 1286 | return SSH_ERR_NEED_REKEY; |
| 1287 | state->p_send.blocks += len / block_size; |
| 1288 | state->p_send.bytes += len; |
| 1289 | sshbuf_reset(state->outgoing_packet); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1290 | |
| 1291 | if (type == SSH2_MSG_NEWKEYS) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1292 | r = ssh_set_newkeys(ssh, MODE_OUT); |
| 1293 | else if (type == SSH2_MSG_USERAUTH_SUCCESS && state->server_side) |
| 1294 | r = ssh_packet_enable_delayed_compress(ssh); |
| 1295 | else |
| 1296 | r = 0; |
| 1297 | out: |
| 1298 | return r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1299 | } |
| 1300 | |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1301 | /* returns non-zero if the specified packet type is usec by KEX */ |
| 1302 | static int |
| 1303 | ssh_packet_type_is_kex(u_char type) |
| 1304 | { |
| 1305 | return |
| 1306 | type >= SSH2_MSG_TRANSPORT_MIN && |
| 1307 | type <= SSH2_MSG_TRANSPORT_MAX && |
| 1308 | type != SSH2_MSG_SERVICE_REQUEST && |
| 1309 | type != SSH2_MSG_SERVICE_ACCEPT && |
| 1310 | type != SSH2_MSG_EXT_INFO; |
| 1311 | } |
| 1312 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1313 | int |
| 1314 | ssh_packet_send2(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1315 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1316 | struct session_state *state = ssh->state; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1317 | struct packet *p; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1318 | u_char type; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1319 | int r, need_rekey; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1320 | |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1321 | if (sshbuf_len(state->outgoing_packet) < 6) |
| 1322 | return SSH_ERR_INTERNAL_ERROR; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1323 | type = sshbuf_ptr(state->outgoing_packet)[5]; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1324 | need_rekey = !ssh_packet_type_is_kex(type) && |
| 1325 | ssh_packet_need_rekeying(ssh, sshbuf_len(state->outgoing_packet)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1326 | |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1327 | /* |
| 1328 | * During rekeying we can only send key exchange messages. |
| 1329 | * Queue everything else. |
| 1330 | */ |
| 1331 | if ((need_rekey || state->rekeying) && !ssh_packet_type_is_kex(type)) { |
| 1332 | if (need_rekey) |
| 1333 | debug3("%s: rekex triggered", __func__); |
| 1334 | debug("enqueue packet: %u", type); |
| 1335 | p = calloc(1, sizeof(*p)); |
| 1336 | if (p == NULL) |
| 1337 | return SSH_ERR_ALLOC_FAIL; |
| 1338 | p->type = type; |
| 1339 | p->payload = state->outgoing_packet; |
| 1340 | TAILQ_INSERT_TAIL(&state->outgoing, p, next); |
| 1341 | state->outgoing_packet = sshbuf_new(); |
| 1342 | if (state->outgoing_packet == NULL) |
| 1343 | return SSH_ERR_ALLOC_FAIL; |
| 1344 | if (need_rekey) { |
| 1345 | /* |
| 1346 | * This packet triggered a rekey, so send the |
| 1347 | * KEXINIT now. |
| 1348 | * NB. reenters this function via kex_start_rekex(). |
| 1349 | */ |
| 1350 | return kex_start_rekex(ssh); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1351 | } |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1352 | return 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1353 | } |
| 1354 | |
| 1355 | /* rekeying starts with sending KEXINIT */ |
| 1356 | if (type == SSH2_MSG_KEXINIT) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1357 | state->rekeying = 1; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1358 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1359 | if ((r = ssh_packet_send2_wrapped(ssh)) != 0) |
| 1360 | return r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1361 | |
| 1362 | /* after a NEWKEYS message we can send the complete queue */ |
| 1363 | if (type == SSH2_MSG_NEWKEYS) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1364 | state->rekeying = 0; |
| 1365 | state->rekey_time = monotime(); |
| 1366 | while ((p = TAILQ_FIRST(&state->outgoing))) { |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1367 | type = p->type; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1368 | /* |
| 1369 | * If this packet triggers a rekex, then skip the |
| 1370 | * remaining packets in the queue for now. |
| 1371 | * NB. re-enters this function via kex_start_rekex. |
| 1372 | */ |
| 1373 | if (ssh_packet_need_rekeying(ssh, |
| 1374 | sshbuf_len(p->payload))) { |
| 1375 | debug3("%s: queued packet triggered rekex", |
| 1376 | __func__); |
| 1377 | return kex_start_rekex(ssh); |
| 1378 | } |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1379 | debug("dequeue packet: %u", type); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1380 | sshbuf_free(state->outgoing_packet); |
| 1381 | state->outgoing_packet = p->payload; |
| 1382 | TAILQ_REMOVE(&state->outgoing, p, next); |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1383 | memset(p, 0, sizeof(*p)); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1384 | free(p); |
| 1385 | if ((r = ssh_packet_send2_wrapped(ssh)) != 0) |
| 1386 | return r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1387 | } |
| 1388 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1389 | return 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1390 | } |
| 1391 | |
| 1392 | /* |
| 1393 | * Waits until a packet has been received, and returns its type. Note that |
| 1394 | * no other data is processed until this returns, so this function should not |
| 1395 | * be used during the interactive session. |
| 1396 | */ |
| 1397 | |
| 1398 | int |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1399 | ssh_packet_read_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1400 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1401 | struct session_state *state = ssh->state; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1402 | int len, r, ms_remain; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1403 | fd_set *setp; |
| 1404 | char buf[8192]; |
| 1405 | struct timeval timeout, start, *timeoutp = NULL; |
| 1406 | |
| 1407 | DBG(debug("packet_read()")); |
| 1408 | |
Greg Hartman | ccacbc9 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 1409 | setp = calloc(howmany(state->connection_in + 1, |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1410 | NFDBITS), sizeof(fd_mask)); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1411 | if (setp == NULL) |
| 1412 | return SSH_ERR_ALLOC_FAIL; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1413 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1414 | /* |
| 1415 | * Since we are blocking, ensure that all written packets have |
| 1416 | * been sent. |
| 1417 | */ |
| 1418 | if ((r = ssh_packet_write_wait(ssh)) != 0) |
Greg Hartman | ccacbc9 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 1419 | goto out; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1420 | |
| 1421 | /* Stay in the loop until we have received a complete packet. */ |
| 1422 | for (;;) { |
| 1423 | /* Try to read a packet from the buffer. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1424 | r = ssh_packet_read_poll_seqnr(ssh, typep, seqnr_p); |
| 1425 | if (r != 0) |
| 1426 | break; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1427 | if (!compat20 && ( |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1428 | *typep == SSH_SMSG_SUCCESS |
| 1429 | || *typep == SSH_SMSG_FAILURE |
| 1430 | || *typep == SSH_CMSG_EOF |
| 1431 | || *typep == SSH_CMSG_EXIT_CONFIRMATION)) |
| 1432 | if ((r = sshpkt_get_end(ssh)) != 0) |
| 1433 | break; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1434 | /* If we got a packet, return it. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1435 | if (*typep != SSH_MSG_NONE) |
| 1436 | break; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1437 | /* |
| 1438 | * Otherwise, wait for some data to arrive, add it to the |
| 1439 | * buffer, and try again. |
| 1440 | */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1441 | memset(setp, 0, howmany(state->connection_in + 1, |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1442 | NFDBITS) * sizeof(fd_mask)); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1443 | FD_SET(state->connection_in, setp); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1444 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1445 | if (state->packet_timeout_ms > 0) { |
| 1446 | ms_remain = state->packet_timeout_ms; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1447 | timeoutp = &timeout; |
| 1448 | } |
| 1449 | /* Wait for some data to arrive. */ |
| 1450 | for (;;) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1451 | if (state->packet_timeout_ms != -1) { |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1452 | ms_to_timeval(&timeout, ms_remain); |
| 1453 | gettimeofday(&start, NULL); |
| 1454 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1455 | if ((r = select(state->connection_in + 1, setp, |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1456 | NULL, NULL, timeoutp)) >= 0) |
| 1457 | break; |
| 1458 | if (errno != EAGAIN && errno != EINTR && |
| 1459 | errno != EWOULDBLOCK) |
| 1460 | break; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1461 | if (state->packet_timeout_ms == -1) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1462 | continue; |
| 1463 | ms_subtract_diff(&start, &ms_remain); |
| 1464 | if (ms_remain <= 0) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1465 | r = 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1466 | break; |
| 1467 | } |
| 1468 | } |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1469 | if (r == 0) { |
| 1470 | r = SSH_ERR_CONN_TIMEOUT; |
| 1471 | goto out; |
| 1472 | } |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1473 | /* Read data from the socket. */ |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1474 | len = read(state->connection_in, buf, sizeof(buf)); |
Greg Hartman | ccacbc9 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 1475 | if (len == 0) { |
| 1476 | r = SSH_ERR_CONN_CLOSED; |
| 1477 | goto out; |
| 1478 | } |
| 1479 | if (len < 0) { |
| 1480 | r = SSH_ERR_SYSTEM_ERROR; |
| 1481 | goto out; |
| 1482 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1483 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1484 | /* Append it to the buffer. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1485 | if ((r = ssh_packet_process_incoming(ssh, buf, len)) != 0) |
Greg Hartman | ccacbc9 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 1486 | goto out; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1487 | } |
Greg Hartman | ccacbc9 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 1488 | out: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1489 | free(setp); |
| 1490 | return r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1491 | } |
| 1492 | |
| 1493 | int |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1494 | ssh_packet_read(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1495 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1496 | u_char type; |
| 1497 | int r; |
| 1498 | |
| 1499 | if ((r = ssh_packet_read_seqnr(ssh, &type, NULL)) != 0) |
| 1500 | fatal("%s: %s", __func__, ssh_err(r)); |
| 1501 | return type; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1502 | } |
| 1503 | |
| 1504 | /* |
| 1505 | * Waits until a packet has been received, verifies that its type matches |
| 1506 | * that given, and gives a fatal error and exits if there is a mismatch. |
| 1507 | */ |
| 1508 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1509 | int |
| 1510 | ssh_packet_read_expect(struct ssh *ssh, u_int expected_type) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1511 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1512 | int r; |
| 1513 | u_char type; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1514 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1515 | if ((r = ssh_packet_read_seqnr(ssh, &type, NULL)) != 0) |
| 1516 | return r; |
| 1517 | if (type != expected_type) { |
| 1518 | if ((r = sshpkt_disconnect(ssh, |
| 1519 | "Protocol error: expected packet type %d, got %d", |
| 1520 | expected_type, type)) != 0) |
| 1521 | return r; |
| 1522 | return SSH_ERR_PROTOCOL_ERROR; |
| 1523 | } |
| 1524 | return 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1525 | } |
| 1526 | |
| 1527 | /* Checks if a full packet is available in the data received so far via |
| 1528 | * packet_process_incoming. If so, reads the packet; otherwise returns |
| 1529 | * SSH_MSG_NONE. This does not wait for data from the connection. |
| 1530 | * |
| 1531 | * SSH_MSG_DISCONNECT is handled specially here. Also, |
| 1532 | * SSH_MSG_IGNORE messages are skipped by this function and are never returned |
| 1533 | * to higher levels. |
| 1534 | */ |
| 1535 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1536 | int |
| 1537 | ssh_packet_read_poll1(struct ssh *ssh, u_char *typep) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1538 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1539 | struct session_state *state = ssh->state; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1540 | u_int len, padded_len; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1541 | const char *emsg; |
| 1542 | const u_char *cp; |
| 1543 | u_char *p; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1544 | u_int checksum, stored_checksum; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1545 | int r; |
| 1546 | |
| 1547 | *typep = SSH_MSG_NONE; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1548 | |
| 1549 | /* Check if input size is less than minimum packet size. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1550 | if (sshbuf_len(state->input) < 4 + 8) |
| 1551 | return 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1552 | /* Get length of incoming packet. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1553 | len = PEEK_U32(sshbuf_ptr(state->input)); |
| 1554 | if (len < 1 + 2 + 2 || len > 256 * 1024) { |
| 1555 | if ((r = sshpkt_disconnect(ssh, "Bad packet length %u", |
| 1556 | len)) != 0) |
| 1557 | return r; |
| 1558 | return SSH_ERR_CONN_CORRUPT; |
| 1559 | } |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1560 | padded_len = (len + 8) & ~7; |
| 1561 | |
| 1562 | /* Check if the packet has been entirely received. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1563 | if (sshbuf_len(state->input) < 4 + padded_len) |
| 1564 | return 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1565 | |
| 1566 | /* The entire packet is in buffer. */ |
| 1567 | |
| 1568 | /* Consume packet length. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1569 | if ((r = sshbuf_consume(state->input, 4)) != 0) |
| 1570 | goto out; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1571 | |
| 1572 | /* |
| 1573 | * Cryptographic attack detector for ssh |
| 1574 | * (C)1998 CORE-SDI, Buenos Aires Argentina |
| 1575 | * Ariel Futoransky(futo@core-sdi.com) |
| 1576 | */ |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1577 | if (!cipher_ctx_is_plaintext(state->receive_context)) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1578 | emsg = NULL; |
| 1579 | switch (detect_attack(&state->deattack, |
| 1580 | sshbuf_ptr(state->input), padded_len)) { |
| 1581 | case DEATTACK_OK: |
| 1582 | break; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1583 | case DEATTACK_DETECTED: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1584 | emsg = "crc32 compensation attack detected"; |
| 1585 | break; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1586 | case DEATTACK_DOS_DETECTED: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1587 | emsg = "deattack denial of service detected"; |
| 1588 | break; |
| 1589 | default: |
| 1590 | emsg = "deattack error"; |
| 1591 | break; |
| 1592 | } |
| 1593 | if (emsg != NULL) { |
| 1594 | error("%s", emsg); |
| 1595 | if ((r = sshpkt_disconnect(ssh, "%s", emsg)) != 0 || |
| 1596 | (r = ssh_packet_write_wait(ssh)) != 0) |
| 1597 | return r; |
| 1598 | return SSH_ERR_CONN_CORRUPT; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1599 | } |
| 1600 | } |
| 1601 | |
| 1602 | /* Decrypt data to incoming_packet. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1603 | sshbuf_reset(state->incoming_packet); |
| 1604 | if ((r = sshbuf_reserve(state->incoming_packet, padded_len, &p)) != 0) |
| 1605 | goto out; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1606 | if ((r = cipher_crypt(state->receive_context, 0, p, |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1607 | sshbuf_ptr(state->input), padded_len, 0, 0)) != 0) |
| 1608 | goto out; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1609 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1610 | if ((r = sshbuf_consume(state->input, padded_len)) != 0) |
| 1611 | goto out; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1612 | |
| 1613 | #ifdef PACKET_DEBUG |
| 1614 | fprintf(stderr, "read_poll plain: "); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1615 | sshbuf_dump(state->incoming_packet, stderr); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1616 | #endif |
| 1617 | |
| 1618 | /* Compute packet checksum. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1619 | checksum = ssh_crc32(sshbuf_ptr(state->incoming_packet), |
| 1620 | sshbuf_len(state->incoming_packet) - 4); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1621 | |
| 1622 | /* Skip padding. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1623 | if ((r = sshbuf_consume(state->incoming_packet, 8 - len % 8)) != 0) |
| 1624 | goto out; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1625 | |
| 1626 | /* Test check bytes. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1627 | if (len != sshbuf_len(state->incoming_packet)) { |
| 1628 | error("%s: len %d != sshbuf_len %zd", __func__, |
| 1629 | len, sshbuf_len(state->incoming_packet)); |
| 1630 | if ((r = sshpkt_disconnect(ssh, "invalid packet length")) != 0 || |
| 1631 | (r = ssh_packet_write_wait(ssh)) != 0) |
| 1632 | return r; |
| 1633 | return SSH_ERR_CONN_CORRUPT; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1634 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1635 | |
| 1636 | cp = sshbuf_ptr(state->incoming_packet) + len - 4; |
| 1637 | stored_checksum = PEEK_U32(cp); |
| 1638 | if (checksum != stored_checksum) { |
| 1639 | error("Corrupted check bytes on input"); |
| 1640 | if ((r = sshpkt_disconnect(ssh, "connection corrupted")) != 0 || |
| 1641 | (r = ssh_packet_write_wait(ssh)) != 0) |
| 1642 | return r; |
| 1643 | return SSH_ERR_CONN_CORRUPT; |
| 1644 | } |
| 1645 | if ((r = sshbuf_consume_end(state->incoming_packet, 4)) < 0) |
| 1646 | goto out; |
| 1647 | |
| 1648 | if (state->packet_compression) { |
| 1649 | sshbuf_reset(state->compression_buffer); |
| 1650 | if ((r = uncompress_buffer(ssh, state->incoming_packet, |
| 1651 | state->compression_buffer)) != 0) |
| 1652 | goto out; |
| 1653 | sshbuf_reset(state->incoming_packet); |
| 1654 | if ((r = sshbuf_putb(state->incoming_packet, |
| 1655 | state->compression_buffer)) != 0) |
| 1656 | goto out; |
| 1657 | } |
| 1658 | state->p_read.packets++; |
| 1659 | state->p_read.bytes += padded_len + 4; |
| 1660 | if ((r = sshbuf_get_u8(state->incoming_packet, typep)) != 0) |
| 1661 | goto out; |
| 1662 | if (*typep < SSH_MSG_MIN || *typep > SSH_MSG_MAX) { |
| 1663 | error("Invalid ssh1 packet type: %d", *typep); |
| 1664 | if ((r = sshpkt_disconnect(ssh, "invalid packet type")) != 0 || |
| 1665 | (r = ssh_packet_write_wait(ssh)) != 0) |
| 1666 | return r; |
| 1667 | return SSH_ERR_PROTOCOL_ERROR; |
| 1668 | } |
| 1669 | r = 0; |
| 1670 | out: |
| 1671 | return r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1672 | } |
| 1673 | |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1674 | static int |
| 1675 | ssh_packet_read_poll2_mux(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p) |
| 1676 | { |
| 1677 | struct session_state *state = ssh->state; |
| 1678 | const u_char *cp; |
| 1679 | size_t need; |
| 1680 | int r; |
| 1681 | |
| 1682 | if (ssh->kex) |
| 1683 | return SSH_ERR_INTERNAL_ERROR; |
| 1684 | *typep = SSH_MSG_NONE; |
| 1685 | cp = sshbuf_ptr(state->input); |
| 1686 | if (state->packlen == 0) { |
| 1687 | if (sshbuf_len(state->input) < 4 + 1) |
| 1688 | return 0; /* packet is incomplete */ |
| 1689 | state->packlen = PEEK_U32(cp); |
| 1690 | if (state->packlen < 4 + 1 || |
| 1691 | state->packlen > PACKET_MAX_SIZE) |
| 1692 | return SSH_ERR_MESSAGE_INCOMPLETE; |
| 1693 | } |
| 1694 | need = state->packlen + 4; |
| 1695 | if (sshbuf_len(state->input) < need) |
| 1696 | return 0; /* packet is incomplete */ |
| 1697 | sshbuf_reset(state->incoming_packet); |
| 1698 | if ((r = sshbuf_put(state->incoming_packet, cp + 4, |
| 1699 | state->packlen)) != 0 || |
| 1700 | (r = sshbuf_consume(state->input, need)) != 0 || |
| 1701 | (r = sshbuf_get_u8(state->incoming_packet, NULL)) != 0 || |
| 1702 | (r = sshbuf_get_u8(state->incoming_packet, typep)) != 0) |
| 1703 | return r; |
| 1704 | if (ssh_packet_log_type(*typep)) |
| 1705 | debug3("%s: type %u", __func__, *typep); |
| 1706 | /* sshbuf_dump(state->incoming_packet, stderr); */ |
| 1707 | /* reset for next packet */ |
| 1708 | state->packlen = 0; |
| 1709 | return r; |
| 1710 | } |
| 1711 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1712 | int |
| 1713 | ssh_packet_read_poll2(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1714 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1715 | struct session_state *state = ssh->state; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1716 | u_int padlen, need; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1717 | u_char *cp; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1718 | u_int maclen, aadlen = 0, authlen = 0, block_size; |
| 1719 | struct sshenc *enc = NULL; |
| 1720 | struct sshmac *mac = NULL; |
| 1721 | struct sshcomp *comp = NULL; |
| 1722 | int r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1723 | |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1724 | if (state->mux) |
| 1725 | return ssh_packet_read_poll2_mux(ssh, typep, seqnr_p); |
| 1726 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1727 | *typep = SSH_MSG_NONE; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1728 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1729 | if (state->packet_discard) |
| 1730 | return 0; |
| 1731 | |
| 1732 | if (state->newkeys[MODE_IN] != NULL) { |
| 1733 | enc = &state->newkeys[MODE_IN]->enc; |
| 1734 | mac = &state->newkeys[MODE_IN]->mac; |
| 1735 | comp = &state->newkeys[MODE_IN]->comp; |
| 1736 | /* disable mac for authenticated encryption */ |
| 1737 | if ((authlen = cipher_authlen(enc->cipher)) != 0) |
| 1738 | mac = NULL; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1739 | } |
| 1740 | maclen = mac && mac->enabled ? mac->mac_len : 0; |
| 1741 | block_size = enc ? enc->block_size : 8; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1742 | aadlen = (mac && mac->enabled && mac->etm) || authlen ? 4 : 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1743 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1744 | if (aadlen && state->packlen == 0) { |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1745 | if (cipher_get_length(state->receive_context, |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1746 | &state->packlen, state->p_read.seqnr, |
| 1747 | sshbuf_ptr(state->input), sshbuf_len(state->input)) != 0) |
| 1748 | return 0; |
| 1749 | if (state->packlen < 1 + 4 || |
| 1750 | state->packlen > PACKET_MAX_SIZE) { |
| 1751 | #ifdef PACKET_DEBUG |
| 1752 | sshbuf_dump(state->input, stderr); |
| 1753 | #endif |
| 1754 | logit("Bad packet length %u.", state->packlen); |
| 1755 | if ((r = sshpkt_disconnect(ssh, "Packet corrupt")) != 0) |
| 1756 | return r; |
Greg Hartman | ccacbc9 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 1757 | return SSH_ERR_CONN_CORRUPT; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1758 | } |
| 1759 | sshbuf_reset(state->incoming_packet); |
| 1760 | } else if (state->packlen == 0) { |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1761 | /* |
| 1762 | * check if input size is less than the cipher block size, |
| 1763 | * decrypt first block and extract length of incoming packet |
| 1764 | */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1765 | if (sshbuf_len(state->input) < block_size) |
| 1766 | return 0; |
| 1767 | sshbuf_reset(state->incoming_packet); |
| 1768 | if ((r = sshbuf_reserve(state->incoming_packet, block_size, |
| 1769 | &cp)) != 0) |
| 1770 | goto out; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1771 | if ((r = cipher_crypt(state->receive_context, |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1772 | state->p_send.seqnr, cp, sshbuf_ptr(state->input), |
| 1773 | block_size, 0, 0)) != 0) |
| 1774 | goto out; |
| 1775 | state->packlen = PEEK_U32(sshbuf_ptr(state->incoming_packet)); |
| 1776 | if (state->packlen < 1 + 4 || |
| 1777 | state->packlen > PACKET_MAX_SIZE) { |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1778 | #ifdef PACKET_DEBUG |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1779 | fprintf(stderr, "input: \n"); |
| 1780 | sshbuf_dump(state->input, stderr); |
| 1781 | fprintf(stderr, "incoming_packet: \n"); |
| 1782 | sshbuf_dump(state->incoming_packet, stderr); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1783 | #endif |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1784 | logit("Bad packet length %u.", state->packlen); |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1785 | return ssh_packet_start_discard(ssh, enc, mac, 0, |
| 1786 | PACKET_MAX_SIZE); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1787 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1788 | if ((r = sshbuf_consume(state->input, block_size)) != 0) |
| 1789 | goto out; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1790 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1791 | DBG(debug("input: packet len %u", state->packlen+4)); |
| 1792 | |
| 1793 | if (aadlen) { |
| 1794 | /* only the payload is encrypted */ |
| 1795 | need = state->packlen; |
| 1796 | } else { |
| 1797 | /* |
| 1798 | * the payload size and the payload are encrypted, but we |
| 1799 | * have a partial packet of block_size bytes |
| 1800 | */ |
| 1801 | need = 4 + state->packlen - block_size; |
| 1802 | } |
| 1803 | DBG(debug("partial packet: block %d, need %d, maclen %d, authlen %d," |
| 1804 | " aadlen %d", block_size, need, maclen, authlen, aadlen)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1805 | if (need % block_size != 0) { |
| 1806 | logit("padding error: need %d block %d mod %d", |
| 1807 | need, block_size, need % block_size); |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1808 | return ssh_packet_start_discard(ssh, enc, mac, 0, |
| 1809 | PACKET_MAX_SIZE - block_size); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1810 | } |
| 1811 | /* |
| 1812 | * check if the entire packet has been received and |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1813 | * decrypt into incoming_packet: |
| 1814 | * 'aadlen' bytes are unencrypted, but authenticated. |
| 1815 | * 'need' bytes are encrypted, followed by either |
| 1816 | * 'authlen' bytes of authentication tag or |
| 1817 | * 'maclen' bytes of message authentication code. |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1818 | */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1819 | if (sshbuf_len(state->input) < aadlen + need + authlen + maclen) |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1820 | return 0; /* packet is incomplete */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1821 | #ifdef PACKET_DEBUG |
| 1822 | fprintf(stderr, "read_poll enc/full: "); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1823 | sshbuf_dump(state->input, stderr); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1824 | #endif |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1825 | /* EtM: check mac over encrypted input */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1826 | if (mac && mac->enabled && mac->etm) { |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1827 | if ((r = mac_check(mac, state->p_read.seqnr, |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1828 | sshbuf_ptr(state->input), aadlen + need, |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1829 | sshbuf_ptr(state->input) + aadlen + need + authlen, |
| 1830 | maclen)) != 0) { |
| 1831 | if (r == SSH_ERR_MAC_INVALID) |
| 1832 | logit("Corrupted MAC on input."); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1833 | goto out; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1834 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1835 | } |
| 1836 | if ((r = sshbuf_reserve(state->incoming_packet, aadlen + need, |
| 1837 | &cp)) != 0) |
| 1838 | goto out; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1839 | if ((r = cipher_crypt(state->receive_context, state->p_read.seqnr, cp, |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1840 | sshbuf_ptr(state->input), need, aadlen, authlen)) != 0) |
| 1841 | goto out; |
| 1842 | if ((r = sshbuf_consume(state->input, aadlen + need + authlen)) != 0) |
| 1843 | goto out; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1844 | if (mac && mac->enabled) { |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1845 | /* Not EtM: check MAC over cleartext */ |
| 1846 | if (!mac->etm && (r = mac_check(mac, state->p_read.seqnr, |
| 1847 | sshbuf_ptr(state->incoming_packet), |
| 1848 | sshbuf_len(state->incoming_packet), |
| 1849 | sshbuf_ptr(state->input), maclen)) != 0) { |
| 1850 | if (r != SSH_ERR_MAC_INVALID) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1851 | goto out; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1852 | logit("Corrupted MAC on input."); |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1853 | if (need + block_size > PACKET_MAX_SIZE) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1854 | return SSH_ERR_INTERNAL_ERROR; |
| 1855 | return ssh_packet_start_discard(ssh, enc, mac, |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1856 | sshbuf_len(state->incoming_packet), |
| 1857 | PACKET_MAX_SIZE - need - block_size); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1858 | } |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1859 | /* Remove MAC from input buffer */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1860 | DBG(debug("MAC #%d ok", state->p_read.seqnr)); |
| 1861 | if ((r = sshbuf_consume(state->input, mac->mac_len)) != 0) |
| 1862 | goto out; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1863 | } |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1864 | if (seqnr_p != NULL) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1865 | *seqnr_p = state->p_read.seqnr; |
| 1866 | if (++state->p_read.seqnr == 0) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1867 | logit("incoming seqnr wraps around"); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1868 | if (++state->p_read.packets == 0) |
| 1869 | if (!(ssh->compat & SSH_BUG_NOREKEY)) |
| 1870 | return SSH_ERR_NEED_REKEY; |
| 1871 | state->p_read.blocks += (state->packlen + 4) / block_size; |
| 1872 | state->p_read.bytes += state->packlen + 4; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1873 | |
| 1874 | /* get padlen */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1875 | padlen = sshbuf_ptr(state->incoming_packet)[4]; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1876 | DBG(debug("input: padlen %d", padlen)); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1877 | if (padlen < 4) { |
| 1878 | if ((r = sshpkt_disconnect(ssh, |
| 1879 | "Corrupted padlen %d on input.", padlen)) != 0 || |
| 1880 | (r = ssh_packet_write_wait(ssh)) != 0) |
| 1881 | return r; |
| 1882 | return SSH_ERR_CONN_CORRUPT; |
| 1883 | } |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1884 | |
| 1885 | /* skip packet size + padlen, discard padding */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1886 | if ((r = sshbuf_consume(state->incoming_packet, 4 + 1)) != 0 || |
| 1887 | ((r = sshbuf_consume_end(state->incoming_packet, padlen)) != 0)) |
| 1888 | goto out; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1889 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1890 | DBG(debug("input: len before de-compress %zd", |
| 1891 | sshbuf_len(state->incoming_packet))); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1892 | if (comp && comp->enabled) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1893 | sshbuf_reset(state->compression_buffer); |
| 1894 | if ((r = uncompress_buffer(ssh, state->incoming_packet, |
| 1895 | state->compression_buffer)) != 0) |
| 1896 | goto out; |
| 1897 | sshbuf_reset(state->incoming_packet); |
| 1898 | if ((r = sshbuf_putb(state->incoming_packet, |
| 1899 | state->compression_buffer)) != 0) |
| 1900 | goto out; |
| 1901 | DBG(debug("input: len after de-compress %zd", |
| 1902 | sshbuf_len(state->incoming_packet))); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1903 | } |
| 1904 | /* |
| 1905 | * get packet type, implies consume. |
| 1906 | * return length of payload (without type field) |
| 1907 | */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1908 | if ((r = sshbuf_get_u8(state->incoming_packet, typep)) != 0) |
| 1909 | goto out; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1910 | if (ssh_packet_log_type(*typep)) |
| 1911 | debug3("receive packet: type %u", *typep); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1912 | if (*typep < SSH2_MSG_MIN || *typep >= SSH2_MSG_LOCAL_MIN) { |
| 1913 | if ((r = sshpkt_disconnect(ssh, |
| 1914 | "Invalid ssh2 packet type: %d", *typep)) != 0 || |
| 1915 | (r = ssh_packet_write_wait(ssh)) != 0) |
| 1916 | return r; |
| 1917 | return SSH_ERR_PROTOCOL_ERROR; |
| 1918 | } |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1919 | if (state->hook_in != NULL && |
| 1920 | (r = state->hook_in(ssh, state->incoming_packet, typep, |
| 1921 | state->hook_in_ctx)) != 0) |
| 1922 | return r; |
| 1923 | if (*typep == SSH2_MSG_USERAUTH_SUCCESS && !state->server_side) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1924 | r = ssh_packet_enable_delayed_compress(ssh); |
| 1925 | else |
| 1926 | r = 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1927 | #ifdef PACKET_DEBUG |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1928 | fprintf(stderr, "read/plain[%d]:\r\n", *typep); |
| 1929 | sshbuf_dump(state->incoming_packet, stderr); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1930 | #endif |
| 1931 | /* reset for next packet */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1932 | state->packlen = 0; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1933 | |
| 1934 | /* do we need to rekey? */ |
| 1935 | if (ssh_packet_need_rekeying(ssh, 0)) { |
| 1936 | debug3("%s: rekex triggered", __func__); |
| 1937 | if ((r = kex_start_rekex(ssh)) != 0) |
| 1938 | return r; |
| 1939 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1940 | out: |
| 1941 | return r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1942 | } |
| 1943 | |
| 1944 | int |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1945 | ssh_packet_read_poll_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1946 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1947 | struct session_state *state = ssh->state; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1948 | u_int reason, seqnr; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1949 | int r; |
| 1950 | u_char *msg; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1951 | |
| 1952 | for (;;) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1953 | msg = NULL; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1954 | if (compat20) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1955 | r = ssh_packet_read_poll2(ssh, typep, seqnr_p); |
| 1956 | if (r != 0) |
| 1957 | return r; |
| 1958 | if (*typep) { |
| 1959 | state->keep_alive_timeouts = 0; |
| 1960 | DBG(debug("received packet type %d", *typep)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1961 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1962 | switch (*typep) { |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1963 | case SSH2_MSG_IGNORE: |
| 1964 | debug3("Received SSH2_MSG_IGNORE"); |
| 1965 | break; |
| 1966 | case SSH2_MSG_DEBUG: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1967 | if ((r = sshpkt_get_u8(ssh, NULL)) != 0 || |
| 1968 | (r = sshpkt_get_string(ssh, &msg, NULL)) != 0 || |
| 1969 | (r = sshpkt_get_string(ssh, NULL, NULL)) != 0) { |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1970 | free(msg); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1971 | return r; |
| 1972 | } |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1973 | debug("Remote: %.900s", msg); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1974 | free(msg); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1975 | break; |
| 1976 | case SSH2_MSG_DISCONNECT: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1977 | if ((r = sshpkt_get_u32(ssh, &reason)) != 0 || |
| 1978 | (r = sshpkt_get_string(ssh, &msg, NULL)) != 0) |
| 1979 | return r; |
| 1980 | /* Ignore normal client exit notifications */ |
| 1981 | do_log2(ssh->state->server_side && |
| 1982 | reason == SSH2_DISCONNECT_BY_APPLICATION ? |
| 1983 | SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_ERROR, |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 1984 | "Received disconnect from %s port %d:" |
| 1985 | "%u: %.400s", ssh_remote_ipaddr(ssh), |
| 1986 | ssh_remote_port(ssh), reason, msg); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1987 | free(msg); |
| 1988 | return SSH_ERR_DISCONNECTED; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1989 | case SSH2_MSG_UNIMPLEMENTED: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1990 | if ((r = sshpkt_get_u32(ssh, &seqnr)) != 0) |
| 1991 | return r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1992 | debug("Received SSH2_MSG_UNIMPLEMENTED for %u", |
| 1993 | seqnr); |
| 1994 | break; |
| 1995 | default: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1996 | return 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 1997 | } |
| 1998 | } else { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1999 | r = ssh_packet_read_poll1(ssh, typep); |
| 2000 | switch (*typep) { |
| 2001 | case SSH_MSG_NONE: |
| 2002 | return SSH_MSG_NONE; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2003 | case SSH_MSG_IGNORE: |
| 2004 | break; |
| 2005 | case SSH_MSG_DEBUG: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2006 | if ((r = sshpkt_get_string(ssh, &msg, NULL)) != 0) |
| 2007 | return r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2008 | debug("Remote: %.900s", msg); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2009 | free(msg); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2010 | break; |
| 2011 | case SSH_MSG_DISCONNECT: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2012 | if ((r = sshpkt_get_string(ssh, &msg, NULL)) != 0) |
| 2013 | return r; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2014 | error("Received disconnect from %s port %d: " |
| 2015 | "%.400s", ssh_remote_ipaddr(ssh), |
| 2016 | ssh_remote_port(ssh), msg); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2017 | free(msg); |
| 2018 | return SSH_ERR_DISCONNECTED; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2019 | default: |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2020 | DBG(debug("received packet type %d", *typep)); |
| 2021 | return 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2022 | } |
| 2023 | } |
| 2024 | } |
| 2025 | } |
| 2026 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2027 | /* |
| 2028 | * Buffers the given amount of input characters. This is intended to be used |
| 2029 | * together with packet_read_poll. |
| 2030 | */ |
| 2031 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2032 | int |
| 2033 | ssh_packet_process_incoming(struct ssh *ssh, const char *buf, u_int len) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2034 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2035 | struct session_state *state = ssh->state; |
| 2036 | int r; |
| 2037 | |
| 2038 | if (state->packet_discard) { |
| 2039 | state->keep_alive_timeouts = 0; /* ?? */ |
| 2040 | if (len >= state->packet_discard) { |
| 2041 | if ((r = ssh_packet_stop_discard(ssh)) != 0) |
| 2042 | return r; |
| 2043 | } |
| 2044 | state->packet_discard -= len; |
| 2045 | return 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2046 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2047 | if ((r = sshbuf_put(ssh->state->input, buf, len)) != 0) |
| 2048 | return r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2049 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2050 | return 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2051 | } |
| 2052 | |
| 2053 | int |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2054 | ssh_packet_remaining(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2055 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2056 | return sshbuf_len(ssh->state->incoming_packet); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2057 | } |
| 2058 | |
| 2059 | /* |
| 2060 | * Sends a diagnostic message from the server to the client. This message |
| 2061 | * can be sent at any time (but not while constructing another message). The |
| 2062 | * message is printed immediately, but only if the client is being executed |
| 2063 | * in verbose mode. These messages are primarily intended to ease debugging |
| 2064 | * authentication problems. The length of the formatted message must not |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2065 | * exceed 1024 bytes. This will automatically call ssh_packet_write_wait. |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2066 | */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2067 | void |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2068 | ssh_packet_send_debug(struct ssh *ssh, const char *fmt,...) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2069 | { |
| 2070 | char buf[1024]; |
| 2071 | va_list args; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2072 | int r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2073 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2074 | if (compat20 && (ssh->compat & SSH_BUG_DEBUG)) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2075 | return; |
| 2076 | |
| 2077 | va_start(args, fmt); |
| 2078 | vsnprintf(buf, sizeof(buf), fmt, args); |
| 2079 | va_end(args); |
| 2080 | |
| 2081 | if (compat20) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2082 | if ((r = sshpkt_start(ssh, SSH2_MSG_DEBUG)) != 0 || |
| 2083 | (r = sshpkt_put_u8(ssh, 0)) != 0 || /* always display */ |
| 2084 | (r = sshpkt_put_cstring(ssh, buf)) != 0 || |
| 2085 | (r = sshpkt_put_cstring(ssh, "")) != 0 || |
| 2086 | (r = sshpkt_send(ssh)) != 0) |
| 2087 | fatal("%s: %s", __func__, ssh_err(r)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2088 | } else { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2089 | if ((r = sshpkt_start(ssh, SSH_MSG_DEBUG)) != 0 || |
| 2090 | (r = sshpkt_put_cstring(ssh, buf)) != 0 || |
| 2091 | (r = sshpkt_send(ssh)) != 0) |
| 2092 | fatal("%s: %s", __func__, ssh_err(r)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2093 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2094 | if ((r = ssh_packet_write_wait(ssh)) != 0) |
| 2095 | fatal("%s: %s", __func__, ssh_err(r)); |
| 2096 | } |
| 2097 | |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2098 | static void |
| 2099 | fmt_connection_id(struct ssh *ssh, char *s, size_t l) |
| 2100 | { |
| 2101 | snprintf(s, l, "%.200s%s%s port %d", |
| 2102 | ssh->log_preamble ? ssh->log_preamble : "", |
| 2103 | ssh->log_preamble ? " " : "", |
| 2104 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh)); |
| 2105 | } |
| 2106 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2107 | /* |
| 2108 | * Pretty-print connection-terminating errors and exit. |
| 2109 | */ |
| 2110 | void |
| 2111 | sshpkt_fatal(struct ssh *ssh, const char *tag, int r) |
| 2112 | { |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2113 | char remote_id[512]; |
| 2114 | |
| 2115 | fmt_connection_id(ssh, remote_id, sizeof(remote_id)); |
| 2116 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2117 | switch (r) { |
| 2118 | case SSH_ERR_CONN_CLOSED: |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2119 | logdie("Connection closed by %s", remote_id); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2120 | case SSH_ERR_CONN_TIMEOUT: |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2121 | logdie("Connection %s %s timed out", |
| 2122 | ssh->state->server_side ? "from" : "to", remote_id); |
Greg Hartman | ccacbc9 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 2123 | case SSH_ERR_DISCONNECTED: |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2124 | logdie("Disconnected from %s", remote_id); |
Greg Hartman | ccacbc9 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 2125 | case SSH_ERR_SYSTEM_ERROR: |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2126 | if (errno == ECONNRESET) |
| 2127 | logdie("Connection reset by %s", remote_id); |
Greg Hartman | ccacbc9 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 2128 | /* FALLTHROUGH */ |
| 2129 | case SSH_ERR_NO_CIPHER_ALG_MATCH: |
| 2130 | case SSH_ERR_NO_MAC_ALG_MATCH: |
| 2131 | case SSH_ERR_NO_COMPRESS_ALG_MATCH: |
| 2132 | case SSH_ERR_NO_KEX_ALG_MATCH: |
| 2133 | case SSH_ERR_NO_HOSTKEY_ALG_MATCH: |
| 2134 | if (ssh && ssh->kex && ssh->kex->failed_choice) { |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2135 | logdie("Unable to negotiate with %s: %s. " |
| 2136 | "Their offer: %s", remote_id, ssh_err(r), |
| 2137 | ssh->kex->failed_choice); |
Greg Hartman | ccacbc9 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 2138 | } |
| 2139 | /* FALLTHROUGH */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2140 | default: |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2141 | logdie("%s%sConnection %s %s: %s", |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2142 | tag != NULL ? tag : "", tag != NULL ? ": " : "", |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2143 | ssh->state->server_side ? "from" : "to", |
| 2144 | remote_id, ssh_err(r)); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2145 | } |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2146 | } |
| 2147 | |
| 2148 | /* |
| 2149 | * Logs the error plus constructs and sends a disconnect packet, closes the |
| 2150 | * connection, and exits. This function never returns. The error message |
| 2151 | * should not contain a newline. The length of the formatted message must |
| 2152 | * not exceed 1024 bytes. |
| 2153 | */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2154 | void |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2155 | ssh_packet_disconnect(struct ssh *ssh, const char *fmt,...) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2156 | { |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2157 | char buf[1024], remote_id[512]; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2158 | va_list args; |
| 2159 | static int disconnecting = 0; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2160 | int r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2161 | |
| 2162 | if (disconnecting) /* Guard against recursive invocations. */ |
| 2163 | fatal("packet_disconnect called recursively."); |
| 2164 | disconnecting = 1; |
| 2165 | |
| 2166 | /* |
| 2167 | * Format the message. Note that the caller must make sure the |
| 2168 | * message is of limited size. |
| 2169 | */ |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2170 | fmt_connection_id(ssh, remote_id, sizeof(remote_id)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2171 | va_start(args, fmt); |
| 2172 | vsnprintf(buf, sizeof(buf), fmt, args); |
| 2173 | va_end(args); |
| 2174 | |
| 2175 | /* Display the error locally */ |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2176 | logit("Disconnecting %s: %.100s", remote_id, buf); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2177 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2178 | /* |
| 2179 | * Send the disconnect message to the other side, and wait |
| 2180 | * for it to get sent. |
| 2181 | */ |
| 2182 | if ((r = sshpkt_disconnect(ssh, "%s", buf)) != 0) |
| 2183 | sshpkt_fatal(ssh, __func__, r); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2184 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2185 | if ((r = ssh_packet_write_wait(ssh)) != 0) |
| 2186 | sshpkt_fatal(ssh, __func__, r); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2187 | |
| 2188 | /* Close the connection. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2189 | ssh_packet_close(ssh); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2190 | cleanup_exit(255); |
| 2191 | } |
| 2192 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2193 | /* |
| 2194 | * Checks if there is any buffered output, and tries to write some of |
| 2195 | * the output. |
| 2196 | */ |
| 2197 | int |
| 2198 | ssh_packet_write_poll(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2199 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2200 | struct session_state *state = ssh->state; |
| 2201 | int len = sshbuf_len(state->output); |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2202 | int r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2203 | |
| 2204 | if (len > 0) { |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2205 | len = write(state->connection_out, |
| 2206 | sshbuf_ptr(state->output), len); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2207 | if (len == -1) { |
| 2208 | if (errno == EINTR || errno == EAGAIN || |
| 2209 | errno == EWOULDBLOCK) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2210 | return 0; |
| 2211 | return SSH_ERR_SYSTEM_ERROR; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2212 | } |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2213 | if (len == 0) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2214 | return SSH_ERR_CONN_CLOSED; |
| 2215 | if ((r = sshbuf_consume(state->output, len)) != 0) |
| 2216 | return r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2217 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2218 | return 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2219 | } |
| 2220 | |
| 2221 | /* |
| 2222 | * Calls packet_write_poll repeatedly until all pending output data has been |
| 2223 | * written. |
| 2224 | */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2225 | int |
| 2226 | ssh_packet_write_wait(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2227 | { |
| 2228 | fd_set *setp; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2229 | int ret, r, ms_remain = 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2230 | struct timeval start, timeout, *timeoutp = NULL; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2231 | struct session_state *state = ssh->state; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2232 | |
Greg Hartman | ccacbc9 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 2233 | setp = calloc(howmany(state->connection_out + 1, |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2234 | NFDBITS), sizeof(fd_mask)); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2235 | if (setp == NULL) |
| 2236 | return SSH_ERR_ALLOC_FAIL; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2237 | if ((r = ssh_packet_write_poll(ssh)) != 0) { |
| 2238 | free(setp); |
| 2239 | return r; |
| 2240 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2241 | while (ssh_packet_have_data_to_write(ssh)) { |
| 2242 | memset(setp, 0, howmany(state->connection_out + 1, |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2243 | NFDBITS) * sizeof(fd_mask)); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2244 | FD_SET(state->connection_out, setp); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2245 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2246 | if (state->packet_timeout_ms > 0) { |
| 2247 | ms_remain = state->packet_timeout_ms; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2248 | timeoutp = &timeout; |
| 2249 | } |
| 2250 | for (;;) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2251 | if (state->packet_timeout_ms != -1) { |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2252 | ms_to_timeval(&timeout, ms_remain); |
| 2253 | gettimeofday(&start, NULL); |
| 2254 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2255 | if ((ret = select(state->connection_out + 1, |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2256 | NULL, setp, NULL, timeoutp)) >= 0) |
| 2257 | break; |
| 2258 | if (errno != EAGAIN && errno != EINTR && |
| 2259 | errno != EWOULDBLOCK) |
| 2260 | break; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2261 | if (state->packet_timeout_ms == -1) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2262 | continue; |
| 2263 | ms_subtract_diff(&start, &ms_remain); |
| 2264 | if (ms_remain <= 0) { |
| 2265 | ret = 0; |
| 2266 | break; |
| 2267 | } |
| 2268 | } |
| 2269 | if (ret == 0) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2270 | free(setp); |
| 2271 | return SSH_ERR_CONN_TIMEOUT; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2272 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2273 | if ((r = ssh_packet_write_poll(ssh)) != 0) { |
| 2274 | free(setp); |
| 2275 | return r; |
| 2276 | } |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2277 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2278 | free(setp); |
| 2279 | return 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2280 | } |
| 2281 | |
| 2282 | /* Returns true if there is buffered data to write to the connection. */ |
| 2283 | |
| 2284 | int |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2285 | ssh_packet_have_data_to_write(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2286 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2287 | return sshbuf_len(ssh->state->output) != 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2288 | } |
| 2289 | |
| 2290 | /* Returns true if there is not too much data to write to the connection. */ |
| 2291 | |
| 2292 | int |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2293 | ssh_packet_not_very_much_data_to_write(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2294 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2295 | if (ssh->state->interactive_mode) |
| 2296 | return sshbuf_len(ssh->state->output) < 16384; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2297 | else |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2298 | return sshbuf_len(ssh->state->output) < 128 * 1024; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2299 | } |
| 2300 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2301 | void |
| 2302 | ssh_packet_set_tos(struct ssh *ssh, int tos) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2303 | { |
| 2304 | #ifndef IP_TOS_IS_BROKEN |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2305 | if (!ssh_packet_connection_is_on_socket(ssh)) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2306 | return; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2307 | switch (ssh_packet_connection_af(ssh)) { |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2308 | # ifdef IP_TOS |
| 2309 | case AF_INET: |
| 2310 | debug3("%s: set IP_TOS 0x%02x", __func__, tos); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2311 | if (setsockopt(ssh->state->connection_in, |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2312 | IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0) |
| 2313 | error("setsockopt IP_TOS %d: %.100s:", |
| 2314 | tos, strerror(errno)); |
| 2315 | break; |
| 2316 | # endif /* IP_TOS */ |
| 2317 | # ifdef IPV6_TCLASS |
| 2318 | case AF_INET6: |
| 2319 | debug3("%s: set IPV6_TCLASS 0x%02x", __func__, tos); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2320 | if (setsockopt(ssh->state->connection_in, |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2321 | IPPROTO_IPV6, IPV6_TCLASS, &tos, sizeof(tos)) < 0) |
| 2322 | error("setsockopt IPV6_TCLASS %d: %.100s:", |
| 2323 | tos, strerror(errno)); |
| 2324 | break; |
| 2325 | # endif /* IPV6_TCLASS */ |
| 2326 | } |
| 2327 | #endif /* IP_TOS_IS_BROKEN */ |
| 2328 | } |
| 2329 | |
| 2330 | /* Informs that the current session is interactive. Sets IP flags for that. */ |
| 2331 | |
| 2332 | void |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2333 | ssh_packet_set_interactive(struct ssh *ssh, int interactive, int qos_interactive, int qos_bulk) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2334 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2335 | struct session_state *state = ssh->state; |
| 2336 | |
| 2337 | if (state->set_interactive_called) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2338 | return; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2339 | state->set_interactive_called = 1; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2340 | |
| 2341 | /* Record that we are in interactive mode. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2342 | state->interactive_mode = interactive; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2343 | |
| 2344 | /* Only set socket options if using a socket. */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2345 | if (!ssh_packet_connection_is_on_socket(ssh)) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2346 | return; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2347 | set_nodelay(state->connection_in); |
| 2348 | ssh_packet_set_tos(ssh, interactive ? qos_interactive : |
| 2349 | qos_bulk); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2350 | } |
| 2351 | |
| 2352 | /* Returns true if the current connection is interactive. */ |
| 2353 | |
| 2354 | int |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2355 | ssh_packet_is_interactive(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2356 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2357 | return ssh->state->interactive_mode; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2358 | } |
| 2359 | |
| 2360 | int |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2361 | ssh_packet_set_maxsize(struct ssh *ssh, u_int s) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2362 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2363 | struct session_state *state = ssh->state; |
| 2364 | |
| 2365 | if (state->set_maxsize_called) { |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2366 | logit("packet_set_maxsize: called twice: old %d new %d", |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2367 | state->max_packet_size, s); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2368 | return -1; |
| 2369 | } |
| 2370 | if (s < 4 * 1024 || s > 1024 * 1024) { |
| 2371 | logit("packet_set_maxsize: bad size %d", s); |
| 2372 | return -1; |
| 2373 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2374 | state->set_maxsize_called = 1; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2375 | debug("packet_set_maxsize: setting to %d", s); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2376 | state->max_packet_size = s; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2377 | return s; |
| 2378 | } |
| 2379 | |
| 2380 | int |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2381 | ssh_packet_inc_alive_timeouts(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2382 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2383 | return ++ssh->state->keep_alive_timeouts; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2384 | } |
| 2385 | |
| 2386 | void |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2387 | ssh_packet_set_alive_timeouts(struct ssh *ssh, int ka) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2388 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2389 | ssh->state->keep_alive_timeouts = ka; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2390 | } |
| 2391 | |
| 2392 | u_int |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2393 | ssh_packet_get_maxsize(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2394 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2395 | return ssh->state->max_packet_size; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2396 | } |
| 2397 | |
| 2398 | /* |
| 2399 | * 9.2. Ignored Data Message |
| 2400 | * |
| 2401 | * byte SSH_MSG_IGNORE |
| 2402 | * string data |
| 2403 | * |
| 2404 | * All implementations MUST understand (and ignore) this message at any |
| 2405 | * time (after receiving the protocol version). No implementation is |
| 2406 | * required to send them. This message can be used as an additional |
| 2407 | * protection measure against advanced traffic analysis techniques. |
| 2408 | */ |
| 2409 | void |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2410 | ssh_packet_send_ignore(struct ssh *ssh, int nbytes) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2411 | { |
| 2412 | u_int32_t rnd = 0; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2413 | int r, i; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2414 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2415 | if ((r = sshpkt_start(ssh, compat20 ? |
| 2416 | SSH2_MSG_IGNORE : SSH_MSG_IGNORE)) != 0 || |
| 2417 | (r = sshpkt_put_u32(ssh, nbytes)) != 0) |
| 2418 | fatal("%s: %s", __func__, ssh_err(r)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2419 | for (i = 0; i < nbytes; i++) { |
| 2420 | if (i % 4 == 0) |
| 2421 | rnd = arc4random(); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2422 | if ((r = sshpkt_put_u8(ssh, (u_char)rnd & 0xff)) != 0) |
| 2423 | fatal("%s: %s", __func__, ssh_err(r)); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2424 | rnd >>= 8; |
| 2425 | } |
| 2426 | } |
| 2427 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2428 | void |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2429 | ssh_packet_set_rekey_limits(struct ssh *ssh, u_int64_t bytes, u_int32_t seconds) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2430 | { |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2431 | debug3("rekey after %llu bytes, %u seconds", (unsigned long long)bytes, |
| 2432 | (unsigned int)seconds); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2433 | ssh->state->rekey_limit = bytes; |
| 2434 | ssh->state->rekey_interval = seconds; |
| 2435 | } |
| 2436 | |
| 2437 | time_t |
| 2438 | ssh_packet_get_rekey_timeout(struct ssh *ssh) |
| 2439 | { |
| 2440 | time_t seconds; |
| 2441 | |
| 2442 | seconds = ssh->state->rekey_time + ssh->state->rekey_interval - |
| 2443 | monotime(); |
| 2444 | return (seconds <= 0 ? 1 : seconds); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2445 | } |
| 2446 | |
| 2447 | void |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2448 | ssh_packet_set_server(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2449 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2450 | ssh->state->server_side = 1; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2451 | } |
| 2452 | |
| 2453 | void |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2454 | ssh_packet_set_authenticated(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2455 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2456 | ssh->state->after_authentication = 1; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2457 | } |
| 2458 | |
| 2459 | void * |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2460 | ssh_packet_get_input(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2461 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2462 | return (void *)ssh->state->input; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2463 | } |
| 2464 | |
| 2465 | void * |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2466 | ssh_packet_get_output(struct ssh *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2467 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2468 | return (void *)ssh->state->output; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2469 | } |
| 2470 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2471 | /* Reset after_authentication and reset compression in post-auth privsep */ |
| 2472 | static int |
| 2473 | ssh_packet_set_postauth(struct ssh *ssh) |
| 2474 | { |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2475 | int r; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2476 | |
| 2477 | debug("%s: called", __func__); |
| 2478 | /* This was set in net child, but is not visible in user child */ |
| 2479 | ssh->state->after_authentication = 1; |
| 2480 | ssh->state->rekeying = 0; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2481 | if ((r = ssh_packet_enable_delayed_compress(ssh)) != 0) |
| 2482 | return r; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2483 | return 0; |
| 2484 | } |
| 2485 | |
| 2486 | /* Packet state (de-)serialization for privsep */ |
| 2487 | |
| 2488 | /* turn kex into a blob for packet state serialization */ |
| 2489 | static int |
| 2490 | kex_to_blob(struct sshbuf *m, struct kex *kex) |
| 2491 | { |
| 2492 | int r; |
| 2493 | |
| 2494 | if ((r = sshbuf_put_string(m, kex->session_id, |
| 2495 | kex->session_id_len)) != 0 || |
| 2496 | (r = sshbuf_put_u32(m, kex->we_need)) != 0 || |
| 2497 | (r = sshbuf_put_u32(m, kex->hostkey_type)) != 0 || |
| 2498 | (r = sshbuf_put_u32(m, kex->kex_type)) != 0 || |
| 2499 | (r = sshbuf_put_stringb(m, kex->my)) != 0 || |
| 2500 | (r = sshbuf_put_stringb(m, kex->peer)) != 0 || |
| 2501 | (r = sshbuf_put_u32(m, kex->flags)) != 0 || |
| 2502 | (r = sshbuf_put_cstring(m, kex->client_version_string)) != 0 || |
| 2503 | (r = sshbuf_put_cstring(m, kex->server_version_string)) != 0) |
| 2504 | return r; |
| 2505 | return 0; |
| 2506 | } |
| 2507 | |
| 2508 | /* turn key exchange results into a blob for packet state serialization */ |
| 2509 | static int |
| 2510 | newkeys_to_blob(struct sshbuf *m, struct ssh *ssh, int mode) |
| 2511 | { |
| 2512 | struct sshbuf *b; |
| 2513 | struct sshcipher_ctx *cc; |
| 2514 | struct sshcomp *comp; |
| 2515 | struct sshenc *enc; |
| 2516 | struct sshmac *mac; |
| 2517 | struct newkeys *newkey; |
| 2518 | int r; |
| 2519 | |
| 2520 | if ((newkey = ssh->state->newkeys[mode]) == NULL) |
| 2521 | return SSH_ERR_INTERNAL_ERROR; |
| 2522 | enc = &newkey->enc; |
| 2523 | mac = &newkey->mac; |
| 2524 | comp = &newkey->comp; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2525 | cc = (mode == MODE_OUT) ? ssh->state->send_context : |
| 2526 | ssh->state->receive_context; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2527 | if ((r = cipher_get_keyiv(cc, enc->iv, enc->iv_len)) != 0) |
| 2528 | return r; |
| 2529 | if ((b = sshbuf_new()) == NULL) |
| 2530 | return SSH_ERR_ALLOC_FAIL; |
| 2531 | /* The cipher struct is constant and shared, you export pointer */ |
| 2532 | if ((r = sshbuf_put_cstring(b, enc->name)) != 0 || |
| 2533 | (r = sshbuf_put(b, &enc->cipher, sizeof(enc->cipher))) != 0 || |
| 2534 | (r = sshbuf_put_u32(b, enc->enabled)) != 0 || |
| 2535 | (r = sshbuf_put_u32(b, enc->block_size)) != 0 || |
| 2536 | (r = sshbuf_put_string(b, enc->key, enc->key_len)) != 0 || |
| 2537 | (r = sshbuf_put_string(b, enc->iv, enc->iv_len)) != 0) |
| 2538 | goto out; |
| 2539 | if (cipher_authlen(enc->cipher) == 0) { |
| 2540 | if ((r = sshbuf_put_cstring(b, mac->name)) != 0 || |
| 2541 | (r = sshbuf_put_u32(b, mac->enabled)) != 0 || |
| 2542 | (r = sshbuf_put_string(b, mac->key, mac->key_len)) != 0) |
| 2543 | goto out; |
| 2544 | } |
| 2545 | if ((r = sshbuf_put_u32(b, comp->type)) != 0 || |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2546 | (r = sshbuf_put_cstring(b, comp->name)) != 0) |
| 2547 | goto out; |
| 2548 | r = sshbuf_put_stringb(m, b); |
| 2549 | out: |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2550 | sshbuf_free(b); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2551 | return r; |
| 2552 | } |
| 2553 | |
| 2554 | /* serialize packet state into a blob */ |
| 2555 | int |
| 2556 | ssh_packet_get_state(struct ssh *ssh, struct sshbuf *m) |
| 2557 | { |
| 2558 | struct session_state *state = ssh->state; |
| 2559 | u_char *p; |
| 2560 | size_t slen, rlen; |
| 2561 | int r, ssh1cipher; |
| 2562 | |
| 2563 | if (!compat20) { |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2564 | ssh1cipher = cipher_ctx_get_number(state->receive_context); |
| 2565 | slen = cipher_get_keyiv_len(state->send_context); |
| 2566 | rlen = cipher_get_keyiv_len(state->receive_context); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2567 | if ((r = sshbuf_put_u32(m, state->remote_protocol_flags)) != 0 || |
| 2568 | (r = sshbuf_put_u32(m, ssh1cipher)) != 0 || |
| 2569 | (r = sshbuf_put_string(m, state->ssh1_key, state->ssh1_keylen)) != 0 || |
| 2570 | (r = sshbuf_put_u32(m, slen)) != 0 || |
| 2571 | (r = sshbuf_reserve(m, slen, &p)) != 0 || |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2572 | (r = cipher_get_keyiv(state->send_context, p, slen)) != 0 || |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2573 | (r = sshbuf_put_u32(m, rlen)) != 0 || |
| 2574 | (r = sshbuf_reserve(m, rlen, &p)) != 0 || |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2575 | (r = cipher_get_keyiv(state->receive_context, p, rlen)) != 0) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2576 | return r; |
| 2577 | } else { |
| 2578 | if ((r = kex_to_blob(m, ssh->kex)) != 0 || |
| 2579 | (r = newkeys_to_blob(m, ssh, MODE_OUT)) != 0 || |
| 2580 | (r = newkeys_to_blob(m, ssh, MODE_IN)) != 0 || |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2581 | (r = sshbuf_put_u64(m, state->rekey_limit)) != 0 || |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2582 | (r = sshbuf_put_u32(m, state->rekey_interval)) != 0 || |
| 2583 | (r = sshbuf_put_u32(m, state->p_send.seqnr)) != 0 || |
| 2584 | (r = sshbuf_put_u64(m, state->p_send.blocks)) != 0 || |
| 2585 | (r = sshbuf_put_u32(m, state->p_send.packets)) != 0 || |
| 2586 | (r = sshbuf_put_u64(m, state->p_send.bytes)) != 0 || |
| 2587 | (r = sshbuf_put_u32(m, state->p_read.seqnr)) != 0 || |
| 2588 | (r = sshbuf_put_u64(m, state->p_read.blocks)) != 0 || |
| 2589 | (r = sshbuf_put_u32(m, state->p_read.packets)) != 0 || |
| 2590 | (r = sshbuf_put_u64(m, state->p_read.bytes)) != 0) |
| 2591 | return r; |
| 2592 | } |
| 2593 | |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2594 | slen = cipher_get_keycontext(state->send_context, NULL); |
| 2595 | rlen = cipher_get_keycontext(state->receive_context, NULL); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2596 | if ((r = sshbuf_put_u32(m, slen)) != 0 || |
| 2597 | (r = sshbuf_reserve(m, slen, &p)) != 0) |
| 2598 | return r; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2599 | if (cipher_get_keycontext(state->send_context, p) != (int)slen) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2600 | return SSH_ERR_INTERNAL_ERROR; |
| 2601 | if ((r = sshbuf_put_u32(m, rlen)) != 0 || |
| 2602 | (r = sshbuf_reserve(m, rlen, &p)) != 0) |
| 2603 | return r; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2604 | if (cipher_get_keycontext(state->receive_context, p) != (int)rlen) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2605 | return SSH_ERR_INTERNAL_ERROR; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2606 | if ((r = sshbuf_put_stringb(m, state->input)) != 0 || |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2607 | (r = sshbuf_put_stringb(m, state->output)) != 0) |
| 2608 | return r; |
| 2609 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2610 | return 0; |
| 2611 | } |
| 2612 | |
| 2613 | /* restore key exchange results from blob for packet state de-serialization */ |
| 2614 | static int |
| 2615 | newkeys_from_blob(struct sshbuf *m, struct ssh *ssh, int mode) |
| 2616 | { |
| 2617 | struct sshbuf *b = NULL; |
| 2618 | struct sshcomp *comp; |
| 2619 | struct sshenc *enc; |
| 2620 | struct sshmac *mac; |
| 2621 | struct newkeys *newkey = NULL; |
| 2622 | size_t keylen, ivlen, maclen; |
| 2623 | int r; |
| 2624 | |
| 2625 | if ((newkey = calloc(1, sizeof(*newkey))) == NULL) { |
| 2626 | r = SSH_ERR_ALLOC_FAIL; |
| 2627 | goto out; |
| 2628 | } |
| 2629 | if ((r = sshbuf_froms(m, &b)) != 0) |
| 2630 | goto out; |
| 2631 | #ifdef DEBUG_PK |
| 2632 | sshbuf_dump(b, stderr); |
| 2633 | #endif |
| 2634 | enc = &newkey->enc; |
| 2635 | mac = &newkey->mac; |
| 2636 | comp = &newkey->comp; |
| 2637 | |
| 2638 | if ((r = sshbuf_get_cstring(b, &enc->name, NULL)) != 0 || |
| 2639 | (r = sshbuf_get(b, &enc->cipher, sizeof(enc->cipher))) != 0 || |
| 2640 | (r = sshbuf_get_u32(b, (u_int *)&enc->enabled)) != 0 || |
| 2641 | (r = sshbuf_get_u32(b, &enc->block_size)) != 0 || |
| 2642 | (r = sshbuf_get_string(b, &enc->key, &keylen)) != 0 || |
| 2643 | (r = sshbuf_get_string(b, &enc->iv, &ivlen)) != 0) |
| 2644 | goto out; |
| 2645 | if (cipher_authlen(enc->cipher) == 0) { |
| 2646 | if ((r = sshbuf_get_cstring(b, &mac->name, NULL)) != 0) |
| 2647 | goto out; |
| 2648 | if ((r = mac_setup(mac, mac->name)) != 0) |
| 2649 | goto out; |
| 2650 | if ((r = sshbuf_get_u32(b, (u_int *)&mac->enabled)) != 0 || |
| 2651 | (r = sshbuf_get_string(b, &mac->key, &maclen)) != 0) |
| 2652 | goto out; |
| 2653 | if (maclen > mac->key_len) { |
| 2654 | r = SSH_ERR_INVALID_FORMAT; |
| 2655 | goto out; |
| 2656 | } |
| 2657 | mac->key_len = maclen; |
| 2658 | } |
| 2659 | if ((r = sshbuf_get_u32(b, &comp->type)) != 0 || |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2660 | (r = sshbuf_get_cstring(b, &comp->name, NULL)) != 0) |
| 2661 | goto out; |
| 2662 | if (enc->name == NULL || |
| 2663 | cipher_by_name(enc->name) != enc->cipher) { |
| 2664 | r = SSH_ERR_INVALID_FORMAT; |
| 2665 | goto out; |
| 2666 | } |
| 2667 | if (sshbuf_len(b) != 0) { |
| 2668 | r = SSH_ERR_INVALID_FORMAT; |
| 2669 | goto out; |
| 2670 | } |
| 2671 | enc->key_len = keylen; |
| 2672 | enc->iv_len = ivlen; |
| 2673 | ssh->kex->newkeys[mode] = newkey; |
| 2674 | newkey = NULL; |
| 2675 | r = 0; |
| 2676 | out: |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2677 | free(newkey); |
| 2678 | sshbuf_free(b); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2679 | return r; |
| 2680 | } |
| 2681 | |
| 2682 | /* restore kex from blob for packet state de-serialization */ |
| 2683 | static int |
| 2684 | kex_from_blob(struct sshbuf *m, struct kex **kexp) |
| 2685 | { |
| 2686 | struct kex *kex; |
| 2687 | int r; |
| 2688 | |
| 2689 | if ((kex = calloc(1, sizeof(struct kex))) == NULL || |
| 2690 | (kex->my = sshbuf_new()) == NULL || |
| 2691 | (kex->peer = sshbuf_new()) == NULL) { |
| 2692 | r = SSH_ERR_ALLOC_FAIL; |
| 2693 | goto out; |
| 2694 | } |
| 2695 | if ((r = sshbuf_get_string(m, &kex->session_id, &kex->session_id_len)) != 0 || |
| 2696 | (r = sshbuf_get_u32(m, &kex->we_need)) != 0 || |
| 2697 | (r = sshbuf_get_u32(m, (u_int *)&kex->hostkey_type)) != 0 || |
| 2698 | (r = sshbuf_get_u32(m, &kex->kex_type)) != 0 || |
| 2699 | (r = sshbuf_get_stringb(m, kex->my)) != 0 || |
| 2700 | (r = sshbuf_get_stringb(m, kex->peer)) != 0 || |
| 2701 | (r = sshbuf_get_u32(m, &kex->flags)) != 0 || |
| 2702 | (r = sshbuf_get_cstring(m, &kex->client_version_string, NULL)) != 0 || |
| 2703 | (r = sshbuf_get_cstring(m, &kex->server_version_string, NULL)) != 0) |
| 2704 | goto out; |
| 2705 | kex->server = 1; |
| 2706 | kex->done = 1; |
| 2707 | r = 0; |
| 2708 | out: |
| 2709 | if (r != 0 || kexp == NULL) { |
| 2710 | if (kex != NULL) { |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2711 | sshbuf_free(kex->my); |
| 2712 | sshbuf_free(kex->peer); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2713 | free(kex); |
| 2714 | } |
| 2715 | if (kexp != NULL) |
| 2716 | *kexp = NULL; |
| 2717 | } else { |
| 2718 | *kexp = kex; |
| 2719 | } |
| 2720 | return r; |
| 2721 | } |
| 2722 | |
| 2723 | /* |
| 2724 | * Restore packet state from content of blob 'm' (de-serialization). |
| 2725 | * Note that 'm' will be partially consumed on parsing or any other errors. |
| 2726 | */ |
| 2727 | int |
| 2728 | ssh_packet_set_state(struct ssh *ssh, struct sshbuf *m) |
| 2729 | { |
| 2730 | struct session_state *state = ssh->state; |
| 2731 | const u_char *ssh1key, *ivin, *ivout, *keyin, *keyout, *input, *output; |
| 2732 | size_t ssh1keylen, rlen, slen, ilen, olen; |
| 2733 | int r; |
| 2734 | u_int ssh1cipher = 0; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2735 | |
| 2736 | if (!compat20) { |
| 2737 | if ((r = sshbuf_get_u32(m, &state->remote_protocol_flags)) != 0 || |
| 2738 | (r = sshbuf_get_u32(m, &ssh1cipher)) != 0 || |
| 2739 | (r = sshbuf_get_string_direct(m, &ssh1key, &ssh1keylen)) != 0 || |
| 2740 | (r = sshbuf_get_string_direct(m, &ivout, &slen)) != 0 || |
| 2741 | (r = sshbuf_get_string_direct(m, &ivin, &rlen)) != 0) |
| 2742 | return r; |
| 2743 | if (ssh1cipher > INT_MAX) |
| 2744 | return SSH_ERR_KEY_UNKNOWN_CIPHER; |
| 2745 | ssh_packet_set_encryption_key(ssh, ssh1key, ssh1keylen, |
| 2746 | (int)ssh1cipher); |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2747 | if (cipher_get_keyiv_len(state->send_context) != (int)slen || |
| 2748 | cipher_get_keyiv_len(state->receive_context) != (int)rlen) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2749 | return SSH_ERR_INVALID_FORMAT; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2750 | if ((r = cipher_set_keyiv(state->send_context, ivout)) != 0 || |
| 2751 | (r = cipher_set_keyiv(state->receive_context, ivin)) != 0) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2752 | return r; |
| 2753 | } else { |
| 2754 | if ((r = kex_from_blob(m, &ssh->kex)) != 0 || |
| 2755 | (r = newkeys_from_blob(m, ssh, MODE_OUT)) != 0 || |
| 2756 | (r = newkeys_from_blob(m, ssh, MODE_IN)) != 0 || |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2757 | (r = sshbuf_get_u64(m, &state->rekey_limit)) != 0 || |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2758 | (r = sshbuf_get_u32(m, &state->rekey_interval)) != 0 || |
| 2759 | (r = sshbuf_get_u32(m, &state->p_send.seqnr)) != 0 || |
| 2760 | (r = sshbuf_get_u64(m, &state->p_send.blocks)) != 0 || |
| 2761 | (r = sshbuf_get_u32(m, &state->p_send.packets)) != 0 || |
| 2762 | (r = sshbuf_get_u64(m, &state->p_send.bytes)) != 0 || |
| 2763 | (r = sshbuf_get_u32(m, &state->p_read.seqnr)) != 0 || |
| 2764 | (r = sshbuf_get_u64(m, &state->p_read.blocks)) != 0 || |
| 2765 | (r = sshbuf_get_u32(m, &state->p_read.packets)) != 0 || |
| 2766 | (r = sshbuf_get_u64(m, &state->p_read.bytes)) != 0) |
| 2767 | return r; |
| 2768 | /* |
| 2769 | * We set the time here so that in post-auth privsep slave we |
| 2770 | * count from the completion of the authentication. |
| 2771 | */ |
| 2772 | state->rekey_time = monotime(); |
| 2773 | /* XXX ssh_set_newkeys overrides p_read.packets? XXX */ |
| 2774 | if ((r = ssh_set_newkeys(ssh, MODE_IN)) != 0 || |
| 2775 | (r = ssh_set_newkeys(ssh, MODE_OUT)) != 0) |
| 2776 | return r; |
| 2777 | } |
| 2778 | if ((r = sshbuf_get_string_direct(m, &keyout, &slen)) != 0 || |
| 2779 | (r = sshbuf_get_string_direct(m, &keyin, &rlen)) != 0) |
| 2780 | return r; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2781 | if (cipher_get_keycontext(state->send_context, NULL) != (int)slen || |
| 2782 | cipher_get_keycontext(state->receive_context, NULL) != (int)rlen) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2783 | return SSH_ERR_INVALID_FORMAT; |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2784 | cipher_set_keycontext(state->send_context, keyout); |
| 2785 | cipher_set_keycontext(state->receive_context, keyin); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2786 | |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2787 | if ((r = ssh_packet_set_postauth(ssh)) != 0) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2788 | return r; |
| 2789 | |
| 2790 | sshbuf_reset(state->input); |
| 2791 | sshbuf_reset(state->output); |
| 2792 | if ((r = sshbuf_get_string_direct(m, &input, &ilen)) != 0 || |
| 2793 | (r = sshbuf_get_string_direct(m, &output, &olen)) != 0 || |
| 2794 | (r = sshbuf_put(state->input, input, ilen)) != 0 || |
| 2795 | (r = sshbuf_put(state->output, output, olen)) != 0) |
| 2796 | return r; |
| 2797 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2798 | if (sshbuf_len(m)) |
| 2799 | return SSH_ERR_INVALID_FORMAT; |
| 2800 | debug3("%s: done", __func__); |
| 2801 | return 0; |
| 2802 | } |
| 2803 | |
| 2804 | /* NEW API */ |
| 2805 | |
| 2806 | /* put data to the outgoing packet */ |
| 2807 | |
| 2808 | int |
| 2809 | sshpkt_put(struct ssh *ssh, const void *v, size_t len) |
| 2810 | { |
| 2811 | return sshbuf_put(ssh->state->outgoing_packet, v, len); |
| 2812 | } |
| 2813 | |
| 2814 | int |
| 2815 | sshpkt_putb(struct ssh *ssh, const struct sshbuf *b) |
| 2816 | { |
| 2817 | return sshbuf_putb(ssh->state->outgoing_packet, b); |
| 2818 | } |
| 2819 | |
| 2820 | int |
| 2821 | sshpkt_put_u8(struct ssh *ssh, u_char val) |
| 2822 | { |
| 2823 | return sshbuf_put_u8(ssh->state->outgoing_packet, val); |
| 2824 | } |
| 2825 | |
| 2826 | int |
| 2827 | sshpkt_put_u32(struct ssh *ssh, u_int32_t val) |
| 2828 | { |
| 2829 | return sshbuf_put_u32(ssh->state->outgoing_packet, val); |
| 2830 | } |
| 2831 | |
| 2832 | int |
| 2833 | sshpkt_put_u64(struct ssh *ssh, u_int64_t val) |
| 2834 | { |
| 2835 | return sshbuf_put_u64(ssh->state->outgoing_packet, val); |
| 2836 | } |
| 2837 | |
| 2838 | int |
| 2839 | sshpkt_put_string(struct ssh *ssh, const void *v, size_t len) |
| 2840 | { |
| 2841 | return sshbuf_put_string(ssh->state->outgoing_packet, v, len); |
| 2842 | } |
| 2843 | |
| 2844 | int |
| 2845 | sshpkt_put_cstring(struct ssh *ssh, const void *v) |
| 2846 | { |
| 2847 | return sshbuf_put_cstring(ssh->state->outgoing_packet, v); |
| 2848 | } |
| 2849 | |
| 2850 | int |
| 2851 | sshpkt_put_stringb(struct ssh *ssh, const struct sshbuf *v) |
| 2852 | { |
| 2853 | return sshbuf_put_stringb(ssh->state->outgoing_packet, v); |
| 2854 | } |
| 2855 | |
Greg Hartman | ccacbc9 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 2856 | #ifdef WITH_OPENSSL |
| 2857 | #ifdef OPENSSL_HAS_ECC |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2858 | int |
| 2859 | sshpkt_put_ec(struct ssh *ssh, const EC_POINT *v, const EC_GROUP *g) |
| 2860 | { |
| 2861 | return sshbuf_put_ec(ssh->state->outgoing_packet, v, g); |
| 2862 | } |
Greg Hartman | ccacbc9 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 2863 | #endif /* OPENSSL_HAS_ECC */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2864 | |
| 2865 | #ifdef WITH_SSH1 |
| 2866 | int |
| 2867 | sshpkt_put_bignum1(struct ssh *ssh, const BIGNUM *v) |
| 2868 | { |
| 2869 | return sshbuf_put_bignum1(ssh->state->outgoing_packet, v); |
| 2870 | } |
| 2871 | #endif /* WITH_SSH1 */ |
| 2872 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2873 | int |
| 2874 | sshpkt_put_bignum2(struct ssh *ssh, const BIGNUM *v) |
| 2875 | { |
| 2876 | return sshbuf_put_bignum2(ssh->state->outgoing_packet, v); |
| 2877 | } |
| 2878 | #endif /* WITH_OPENSSL */ |
| 2879 | |
| 2880 | /* fetch data from the incoming packet */ |
| 2881 | |
| 2882 | int |
| 2883 | sshpkt_get(struct ssh *ssh, void *valp, size_t len) |
| 2884 | { |
| 2885 | return sshbuf_get(ssh->state->incoming_packet, valp, len); |
| 2886 | } |
| 2887 | |
| 2888 | int |
| 2889 | sshpkt_get_u8(struct ssh *ssh, u_char *valp) |
| 2890 | { |
| 2891 | return sshbuf_get_u8(ssh->state->incoming_packet, valp); |
| 2892 | } |
| 2893 | |
| 2894 | int |
| 2895 | sshpkt_get_u32(struct ssh *ssh, u_int32_t *valp) |
| 2896 | { |
| 2897 | return sshbuf_get_u32(ssh->state->incoming_packet, valp); |
| 2898 | } |
| 2899 | |
| 2900 | int |
| 2901 | sshpkt_get_u64(struct ssh *ssh, u_int64_t *valp) |
| 2902 | { |
| 2903 | return sshbuf_get_u64(ssh->state->incoming_packet, valp); |
| 2904 | } |
| 2905 | |
| 2906 | int |
| 2907 | sshpkt_get_string(struct ssh *ssh, u_char **valp, size_t *lenp) |
| 2908 | { |
| 2909 | return sshbuf_get_string(ssh->state->incoming_packet, valp, lenp); |
| 2910 | } |
| 2911 | |
| 2912 | int |
| 2913 | sshpkt_get_string_direct(struct ssh *ssh, const u_char **valp, size_t *lenp) |
| 2914 | { |
| 2915 | return sshbuf_get_string_direct(ssh->state->incoming_packet, valp, lenp); |
| 2916 | } |
| 2917 | |
| 2918 | int |
| 2919 | sshpkt_get_cstring(struct ssh *ssh, char **valp, size_t *lenp) |
| 2920 | { |
| 2921 | return sshbuf_get_cstring(ssh->state->incoming_packet, valp, lenp); |
| 2922 | } |
| 2923 | |
Greg Hartman | ccacbc9 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 2924 | #ifdef WITH_OPENSSL |
| 2925 | #ifdef OPENSSL_HAS_ECC |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2926 | int |
| 2927 | sshpkt_get_ec(struct ssh *ssh, EC_POINT *v, const EC_GROUP *g) |
| 2928 | { |
| 2929 | return sshbuf_get_ec(ssh->state->incoming_packet, v, g); |
| 2930 | } |
Greg Hartman | ccacbc9 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 2931 | #endif /* OPENSSL_HAS_ECC */ |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2932 | |
| 2933 | #ifdef WITH_SSH1 |
| 2934 | int |
| 2935 | sshpkt_get_bignum1(struct ssh *ssh, BIGNUM *v) |
| 2936 | { |
| 2937 | return sshbuf_get_bignum1(ssh->state->incoming_packet, v); |
| 2938 | } |
| 2939 | #endif /* WITH_SSH1 */ |
| 2940 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 2941 | int |
| 2942 | sshpkt_get_bignum2(struct ssh *ssh, BIGNUM *v) |
| 2943 | { |
| 2944 | return sshbuf_get_bignum2(ssh->state->incoming_packet, v); |
| 2945 | } |
| 2946 | #endif /* WITH_OPENSSL */ |
| 2947 | |
| 2948 | int |
| 2949 | sshpkt_get_end(struct ssh *ssh) |
| 2950 | { |
| 2951 | if (sshbuf_len(ssh->state->incoming_packet) > 0) |
| 2952 | return SSH_ERR_UNEXPECTED_TRAILING_DATA; |
| 2953 | return 0; |
| 2954 | } |
| 2955 | |
| 2956 | const u_char * |
| 2957 | sshpkt_ptr(struct ssh *ssh, size_t *lenp) |
| 2958 | { |
| 2959 | if (lenp != NULL) |
| 2960 | *lenp = sshbuf_len(ssh->state->incoming_packet); |
| 2961 | return sshbuf_ptr(ssh->state->incoming_packet); |
| 2962 | } |
| 2963 | |
| 2964 | /* start a new packet */ |
| 2965 | |
| 2966 | int |
| 2967 | sshpkt_start(struct ssh *ssh, u_char type) |
| 2968 | { |
| 2969 | u_char buf[9]; |
| 2970 | int len; |
| 2971 | |
| 2972 | DBG(debug("packet_start[%d]", type)); |
| 2973 | len = compat20 ? 6 : 9; |
| 2974 | memset(buf, 0, len - 1); |
| 2975 | buf[len - 1] = type; |
| 2976 | sshbuf_reset(ssh->state->outgoing_packet); |
| 2977 | return sshbuf_put(ssh->state->outgoing_packet, buf, len); |
| 2978 | } |
| 2979 | |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 2980 | static int |
| 2981 | ssh_packet_send_mux(struct ssh *ssh) |
| 2982 | { |
| 2983 | struct session_state *state = ssh->state; |
| 2984 | u_char type, *cp; |
| 2985 | size_t len; |
| 2986 | int r; |
| 2987 | |
| 2988 | if (ssh->kex) |
| 2989 | return SSH_ERR_INTERNAL_ERROR; |
| 2990 | len = sshbuf_len(state->outgoing_packet); |
| 2991 | if (len < 6) |
| 2992 | return SSH_ERR_INTERNAL_ERROR; |
| 2993 | cp = sshbuf_mutable_ptr(state->outgoing_packet); |
| 2994 | type = cp[5]; |
| 2995 | if (ssh_packet_log_type(type)) |
| 2996 | debug3("%s: type %u", __func__, type); |
| 2997 | /* drop everything, but the connection protocol */ |
| 2998 | if (type >= SSH2_MSG_CONNECTION_MIN && |
| 2999 | type <= SSH2_MSG_CONNECTION_MAX) { |
| 3000 | POKE_U32(cp, len - 4); |
| 3001 | if ((r = sshbuf_putb(state->output, |
| 3002 | state->outgoing_packet)) != 0) |
| 3003 | return r; |
| 3004 | /* sshbuf_dump(state->output, stderr); */ |
| 3005 | } |
| 3006 | sshbuf_reset(state->outgoing_packet); |
| 3007 | return 0; |
| 3008 | } |
| 3009 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 3010 | /* send it */ |
| 3011 | |
| 3012 | int |
| 3013 | sshpkt_send(struct ssh *ssh) |
| 3014 | { |
Greg Hartman | 9768ca4 | 2017-06-22 20:49:52 -0700 | [diff] [blame] | 3015 | if (ssh->state && ssh->state->mux) |
| 3016 | return ssh_packet_send_mux(ssh); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 3017 | if (compat20) |
| 3018 | return ssh_packet_send2(ssh); |
| 3019 | else |
| 3020 | return ssh_packet_send1(ssh); |
| 3021 | } |
| 3022 | |
| 3023 | int |
| 3024 | sshpkt_disconnect(struct ssh *ssh, const char *fmt,...) |
| 3025 | { |
| 3026 | char buf[1024]; |
| 3027 | va_list args; |
| 3028 | int r; |
| 3029 | |
| 3030 | va_start(args, fmt); |
| 3031 | vsnprintf(buf, sizeof(buf), fmt, args); |
| 3032 | va_end(args); |
| 3033 | |
| 3034 | if (compat20) { |
| 3035 | if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 || |
| 3036 | (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_PROTOCOL_ERROR)) != 0 || |
| 3037 | (r = sshpkt_put_cstring(ssh, buf)) != 0 || |
| 3038 | (r = sshpkt_put_cstring(ssh, "")) != 0 || |
| 3039 | (r = sshpkt_send(ssh)) != 0) |
| 3040 | return r; |
| 3041 | } else { |
| 3042 | if ((r = sshpkt_start(ssh, SSH_MSG_DISCONNECT)) != 0 || |
| 3043 | (r = sshpkt_put_cstring(ssh, buf)) != 0 || |
| 3044 | (r = sshpkt_send(ssh)) != 0) |
| 3045 | return r; |
| 3046 | } |
| 3047 | return 0; |
| 3048 | } |
| 3049 | |
| 3050 | /* roundup current message to pad bytes */ |
| 3051 | int |
| 3052 | sshpkt_add_padding(struct ssh *ssh, u_char pad) |
| 3053 | { |
| 3054 | ssh->state->extra_pad = pad; |
| 3055 | return 0; |
| 3056 | } |