annotate packet.c @ 932:3873b39c4de6

Print errno information in write_packet
author Ronny Meeus <ronny.meeus@gmail.com>
date Tue, 20 May 2014 20:56:59 +0800
parents 7cd89d4e0335
children c919dbb39395
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #include "includes.h"
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26 #include "packet.h"
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27 #include "session.h"
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28 #include "dbutil.h"
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29 #include "ssh.h"
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30 #include "algo.h"
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31 #include "buffer.h"
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32 #include "kex.h"
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33 #include "dbrandom.h"
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34 #include "service.h"
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35 #include "auth.h"
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36 #include "channel.h"
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37
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38 static int read_packet_init();
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39 static void make_mac(unsigned int seqno, const struct key_context_directional * key_state,
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40 buffer * clear_buf, unsigned int clear_len,
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41 unsigned char *output_mac);
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42 static int checkmac();
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43
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44 /* For exact details see http://www.zlib.net/zlib_tech.html
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45 * 5 bytes per 16kB block, plus 6 bytes for the stream.
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46 * We might allocate 5 unnecessary bytes here if it's an
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47 * exact multiple. */
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48 #define ZLIB_COMPRESS_EXPANSION (((RECV_MAX_PAYLOAD_LEN/16384)+1)*5 + 6)
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49 #define ZLIB_DECOMPRESS_INCR 1024
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50 #ifndef DISABLE_ZLIB
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51 static buffer* buf_decompress(buffer* buf, unsigned int len);
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52 static void buf_compress(buffer * dest, buffer * src, unsigned int len);
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53 #endif
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54
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55 /* non-blocking function writing out a current encrypted packet */
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56 void write_packet() {
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57
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58 int len, written;
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59 buffer * writebuf = NULL;
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60 time_t now;
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61 unsigned packet_type;
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62 int all_ignore = 1;
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63 #ifdef HAVE_WRITEV
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64 struct iovec *iov = NULL;
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65 int i;
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66 struct Link *l;
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67 #endif
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68
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69 TRACE2(("enter write_packet"))
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70 dropbear_assert(!isempty(&ses.writequeue));
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71
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72 #ifdef HAVE_WRITEV
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73 iov = m_malloc(sizeof(*iov) * ses.writequeue.count);
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74 for (l = ses.writequeue.head, i = 0; l; l = l->link, i++)
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75 {
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76 writebuf = (buffer*)l->item;
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77 packet_type = writebuf->data[writebuf->len-1];
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78 len = writebuf->len - 1 - writebuf->pos;
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79 dropbear_assert(len > 0);
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80 all_ignore &= (packet_type == SSH_MSG_IGNORE);
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81 TRACE2(("write_packet writev #%d type %d len %d/%d", i, packet_type,
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82 len, writebuf->len-1))
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83 iov[i].iov_base = buf_getptr(writebuf, len);
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84 iov[i].iov_len = len;
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85 }
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86 written = writev(ses.sock_out, iov, ses.writequeue.count);
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87 if (written < 0) {
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88 if (errno == EINTR) {
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89 m_free(iov);
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90 TRACE2(("leave write_packet: EINTR"))
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91 return;
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92 } else {
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93 dropbear_exit("Error writing: %s", strerror(errno));
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94 }
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95 }
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96
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97 if (written == 0) {
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98 ses.remoteclosed();
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99 }
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100
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101 while (written > 0) {
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102 writebuf = (buffer*)examine(&ses.writequeue);
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103 len = writebuf->len - 1 - writebuf->pos;
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104 if (len > written) {
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105 /* partial buffer write */
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106 buf_incrpos(writebuf, written);
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107 written = 0;
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108 } else {
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109 written -= len;
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110 dequeue(&ses.writequeue);
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111 buf_free(writebuf);
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112 }
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113 }
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114
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115 m_free(iov);
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116
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117 #else
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118 /* Get the next buffer in the queue of encrypted packets to write*/
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119 writebuf = (buffer*)examine(&ses.writequeue);
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120
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121 /* The last byte of the buffer is not to be transmitted, but is
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122 * a cleartext packet_type indicator */
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123 packet_type = writebuf->data[writebuf->len-1];
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124 len = writebuf->len - 1 - writebuf->pos;
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125 dropbear_assert(len > 0);
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126 /* Try to write as much as possible */
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127 written = write(ses.sock_out, buf_getptr(writebuf, len), len);
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128
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129 if (written < 0) {
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130 if (errno == EINTR) {
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131 TRACE2(("leave writepacket: EINTR"))
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132 return;
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133 } else {
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134 dropbear_exit("Error writing: %s", strerror(errno));
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135 }
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136 }
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137 all_ignore = (packet_type == SSH_MSG_IGNORE);
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parents:
diff changeset
138
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
139 if (written == 0) {
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 27
diff changeset
140 ses.remoteclosed();
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
141 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
142
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
143 if (written == len) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
144 /* We've finished with the packet, free it */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
145 dequeue(&ses.writequeue);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
146 buf_free(writebuf);
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
147 writebuf = NULL;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
148 } else {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
149 /* More packet left to write, leave it in the queue for later */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
150 buf_incrpos(writebuf, written);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
151 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
152
728
f27058078d61 Try using writev() for writing packets out to tcp
Matt Johnston <matt@ucc.asn.au>
parents: 711
diff changeset
153 #endif
928
7cd89d4e0335 Add new monotonic_now() wrapper so that timeouts are unaffected by
Matt Johnston <matt@ucc.asn.au>
parents: 926
diff changeset
154 now = monotonic_now();
728
f27058078d61 Try using writev() for writing packets out to tcp
Matt Johnston <matt@ucc.asn.au>
parents: 711
diff changeset
155 ses.last_trx_packet_time = now;
f27058078d61 Try using writev() for writing packets out to tcp
Matt Johnston <matt@ucc.asn.au>
parents: 711
diff changeset
156
f27058078d61 Try using writev() for writing packets out to tcp
Matt Johnston <matt@ucc.asn.au>
parents: 711
diff changeset
157 if (!all_ignore) {
f27058078d61 Try using writev() for writing packets out to tcp
Matt Johnston <matt@ucc.asn.au>
parents: 711
diff changeset
158 ses.last_packet_time = now;
f27058078d61 Try using writev() for writing packets out to tcp
Matt Johnston <matt@ucc.asn.au>
parents: 711
diff changeset
159 }
f27058078d61 Try using writev() for writing packets out to tcp
Matt Johnston <matt@ucc.asn.au>
parents: 711
diff changeset
160
731
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Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
161 TRACE2(("leave write_packet"))
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
162 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
163
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
164 /* Non-blocking function reading available portion of a packet into the
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
165 * ses's buffer, decrypting the length if encrypted, decrypting the
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
166 * full portion if possible */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
167 void read_packet() {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
168
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
169 int len;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
170 unsigned int maxlen;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
171 unsigned char blocksize;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
172
731
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Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
173 TRACE2(("enter read_packet"))
534
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parents: 533
diff changeset
174 blocksize = ses.keys->recv.algo_crypt->blocksize;
27
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175
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
176 if (ses.readbuf == NULL || ses.readbuf->len < blocksize) {
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
177 int ret;
27
08da099e8337 - Rename common-packet.c to packet.c
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parents:
diff changeset
178 /* In the first blocksize of a packet */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
179
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
180 /* Read the first blocksize of the packet, so we can decrypt it and
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
181 * find the length of the whole packet */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
182 ret = read_packet_init();
27
08da099e8337 - Rename common-packet.c to packet.c
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parents:
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183
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
184 if (ret == DROPBEAR_FAILURE) {
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
185 /* didn't read enough to determine the length */
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
186 TRACE2(("leave read_packet: packetinit done"))
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
187 return;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
188 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
189 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
190
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
191 /* Attempt to read the remainder of the packet, note that there
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
192 * mightn't be any available (EAGAIN) */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
193 maxlen = ses.readbuf->len - ses.readbuf->pos;
711
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be
Matt Johnston <matt@ucc.asn.au>
parents: 623
diff changeset
194 if (maxlen == 0) {
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be
Matt Johnston <matt@ucc.asn.au>
parents: 623
diff changeset
195 /* Occurs when the packet is only a single block long and has all
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be
Matt Johnston <matt@ucc.asn.au>
parents: 623
diff changeset
196 * been read in read_packet_init(). Usually means that MAC is disabled
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be
Matt Johnston <matt@ucc.asn.au>
parents: 623
diff changeset
197 */
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be
Matt Johnston <matt@ucc.asn.au>
parents: 623
diff changeset
198 len = 0;
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be
Matt Johnston <matt@ucc.asn.au>
parents: 623
diff changeset
199 } else {
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be
Matt Johnston <matt@ucc.asn.au>
parents: 623
diff changeset
200 len = read(ses.sock_in, buf_getptr(ses.readbuf, maxlen), maxlen);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
201
711
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be
Matt Johnston <matt@ucc.asn.au>
parents: 623
diff changeset
202 if (len == 0) {
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be
Matt Johnston <matt@ucc.asn.au>
parents: 623
diff changeset
203 ses.remoteclosed();
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be
Matt Johnston <matt@ucc.asn.au>
parents: 623
diff changeset
204 }
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
205
711
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be
Matt Johnston <matt@ucc.asn.au>
parents: 623
diff changeset
206 if (len < 0) {
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be
Matt Johnston <matt@ucc.asn.au>
parents: 623
diff changeset
207 if (errno == EINTR || errno == EAGAIN) {
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
208 TRACE2(("leave read_packet: EINTR or EAGAIN"))
711
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be
Matt Johnston <matt@ucc.asn.au>
parents: 623
diff changeset
209 return;
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be
Matt Johnston <matt@ucc.asn.au>
parents: 623
diff changeset
210 } else {
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be
Matt Johnston <matt@ucc.asn.au>
parents: 623
diff changeset
211 dropbear_exit("Error reading: %s", strerror(errno));
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be
Matt Johnston <matt@ucc.asn.au>
parents: 623
diff changeset
212 }
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
213 }
711
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be
Matt Johnston <matt@ucc.asn.au>
parents: 623
diff changeset
214
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be
Matt Johnston <matt@ucc.asn.au>
parents: 623
diff changeset
215 buf_incrpos(ses.readbuf, len);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
217
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
218 if ((unsigned int)len == maxlen) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
219 /* The whole packet has been read */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
220 decrypt_packet();
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
221 /* The main select() loop process_packet() to
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
222 * handle the packet contents... */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
223 }
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
224 TRACE2(("leave read_packet"))
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
225 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
226
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
227 /* Function used to read the initial portion of a packet, and determine the
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228 * length. Only called during the first BLOCKSIZE of a packet. */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
229 /* Returns DROPBEAR_SUCCESS if the length is determined,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
230 * DROPBEAR_FAILURE otherwise */
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
231 static int read_packet_init() {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
232
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
233 unsigned int maxlen;
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
234 int slen;
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
235 unsigned int len;
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
236 unsigned int blocksize;
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
237 unsigned int macsize;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
239
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
240 blocksize = ses.keys->recv.algo_crypt->blocksize;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
241 macsize = ses.keys->recv.algo_mac->hashsize;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243 if (ses.readbuf == NULL) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 /* start of a new packet */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245 ses.readbuf = buf_new(INIT_READBUF);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
247
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
248 maxlen = blocksize - ses.readbuf->pos;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
249
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250 /* read the rest of the packet if possible */
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
251 slen = read(ses.sock_in, buf_getwriteptr(ses.readbuf, maxlen),
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252 maxlen);
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
253 if (slen == 0) {
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 27
diff changeset
254 ses.remoteclosed();
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 }
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
256 if (slen < 0) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
257 if (errno == EINTR) {
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
258 TRACE2(("leave read_packet_init: EINTR"))
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
259 return DROPBEAR_FAILURE;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
260 }
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 592
diff changeset
261 dropbear_exit("Error reading: %s", strerror(errno));
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
262 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
264 buf_incrwritepos(ses.readbuf, slen);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
265
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
266 if ((unsigned int)slen != maxlen) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
267 /* don't have enough bytes to determine length, get next time */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
268 return DROPBEAR_FAILURE;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
269 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
270
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
271 /* now we have the first block, need to get packet length, so we decrypt
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
272 * the first block (only need first 4 bytes) */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
273 buf_setpos(ses.readbuf, 0);
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
274 if (ses.keys->recv.crypt_mode->decrypt(buf_getptr(ses.readbuf, blocksize),
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
275 buf_getwriteptr(ses.readbuf, blocksize),
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
276 blocksize,
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
277 &ses.keys->recv.cipher_state) != CRYPT_OK) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 592
diff changeset
278 dropbear_exit("Error decrypting");
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
279 }
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
280 len = buf_getint(ses.readbuf) + 4 + macsize;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
281
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
282 TRACE2(("packet size is %d, block %d mac %d", len, blocksize, macsize))
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
283
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
284
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
285 /* check packet length */
448
9c61e7af0156 Rearrange the channel buffer sizes into three neat use-editable values in
Matt Johnston <matt@ucc.asn.au>
parents: 426
diff changeset
286 if ((len > RECV_MAX_PACKET_LEN) ||
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
287 (len < MIN_PACKET_LEN + macsize) ||
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
288 ((len - macsize) % blocksize != 0)) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 592
diff changeset
289 dropbear_exit("Integrity error (bad packet size %d)", len);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
290 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
291
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
292 if (len > ses.readbuf->size) {
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
293 buf_resize(ses.readbuf, len);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
294 }
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
295 buf_setlen(ses.readbuf, len);
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
296 buf_setpos(ses.readbuf, blocksize);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
297 return DROPBEAR_SUCCESS;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
298 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
299
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
300 /* handle the received packet */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
301 void decrypt_packet() {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
302
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
303 unsigned char blocksize;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
304 unsigned char macsize;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
305 unsigned int padlen;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
306 unsigned int len;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
307
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
308 TRACE2(("enter decrypt_packet"))
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
309 blocksize = ses.keys->recv.algo_crypt->blocksize;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
310 macsize = ses.keys->recv.algo_mac->hashsize;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
311
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
312 ses.kexstate.datarecv += ses.readbuf->len;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
313
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
314 /* we've already decrypted the first blocksize in read_packet_init */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
315 buf_setpos(ses.readbuf, blocksize);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
316
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
317 /* decrypt it in-place */
528
378a6389f88e - Don't be dumb and encrypt/decrypt in a while() loop - why did I do this??
Matt Johnston <matt@ucc.asn.au>
parents: 513
diff changeset
318 len = ses.readbuf->len - macsize - ses.readbuf->pos;
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
319 if (ses.keys->recv.crypt_mode->decrypt(
528
378a6389f88e - Don't be dumb and encrypt/decrypt in a while() loop - why did I do this??
Matt Johnston <matt@ucc.asn.au>
parents: 513
diff changeset
320 buf_getptr(ses.readbuf, len),
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
321 buf_getwriteptr(ses.readbuf, len),
528
378a6389f88e - Don't be dumb and encrypt/decrypt in a while() loop - why did I do this??
Matt Johnston <matt@ucc.asn.au>
parents: 513
diff changeset
322 len,
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
323 &ses.keys->recv.cipher_state) != CRYPT_OK) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 592
diff changeset
324 dropbear_exit("Error decrypting");
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
325 }
528
378a6389f88e - Don't be dumb and encrypt/decrypt in a while() loop - why did I do this??
Matt Johnston <matt@ucc.asn.au>
parents: 513
diff changeset
326 buf_incrpos(ses.readbuf, len);
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
327
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
328 /* check the hmac */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
329 if (checkmac() != DROPBEAR_SUCCESS) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
330 dropbear_exit("Integrity error");
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
331 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
332
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
333 /* get padding length */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
334 buf_setpos(ses.readbuf, PACKET_PADDING_OFF);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
335 padlen = buf_getbyte(ses.readbuf);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
336
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
337 /* payload length */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
338 /* - 4 - 1 is for LEN and PADLEN values */
556
ccdc4c6183c0 - Payload length doesn't include macsize.
Matt Johnston <matt@ucc.asn.au>
parents: 535
diff changeset
339 len = ses.readbuf->len - padlen - 4 - 1 - macsize;
906
4696755c4cac A few fixes for cases where compression increases payload sizes, and
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
340 if ((len > RECV_MAX_PAYLOAD_LEN+ZLIB_COMPRESS_EXPANSION) || (len < 1)) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 592
diff changeset
341 dropbear_exit("Bad packet size %d", len);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
342 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
343
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
344 buf_setpos(ses.readbuf, PACKET_PAYLOAD_OFF);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
345
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
346 #ifndef DISABLE_ZLIB
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
347 if (is_compress_recv()) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
348 /* decompress */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
349 ses.payload = buf_decompress(ses.readbuf, len);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
350 } else
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
351 #endif
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
352 {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
353 /* copy payload */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
354 ses.payload = buf_new(len);
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
355 memcpy(ses.payload->data, buf_getptr(ses.readbuf, len), len);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
356 buf_incrlen(ses.payload, len);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
357 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
358
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
359 buf_free(ses.readbuf);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
360 ses.readbuf = NULL;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
361 buf_setpos(ses.payload, 0);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
362
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
363 ses.recvseq++;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
364
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
365 TRACE2(("leave decrypt_packet"))
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
366 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
367
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
368 /* Checks the mac at the end of a decrypted readbuf.
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
369 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
370 static int checkmac() {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
371
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
372 unsigned char mac_bytes[MAX_MAC_LEN];
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
373 unsigned int mac_size, contents_len;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
374
752
24172f555f9c Fix MAC bug which would prevent asymmetric hashes
Matt Johnston <matt@ucc.asn.au>
parents: 731
diff changeset
375 mac_size = ses.keys->recv.algo_mac->hashsize;
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
376 contents_len = ses.readbuf->len - mac_size;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
377
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
378 buf_setpos(ses.readbuf, 0);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
379 make_mac(ses.recvseq, &ses.keys->recv, ses.readbuf, contents_len, mac_bytes);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
380
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
381 /* compare the hash */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
382 buf_setpos(ses.readbuf, contents_len);
817
a625f9e135a4 Constant time memcmp for the hmac and password crypt
Matt Johnston <matt@ucc.asn.au>
parents: 791
diff changeset
383 if (constant_time_memcmp(mac_bytes, buf_getptr(ses.readbuf, mac_size), mac_size) != 0) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
384 return DROPBEAR_FAILURE;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
385 } else {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
386 return DROPBEAR_SUCCESS;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
387 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
388 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
389
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
390 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
391 /* returns a pointer to a newly created buffer */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
392 static buffer* buf_decompress(buffer* buf, unsigned int len) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
393
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
394 int result;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
395 buffer * ret;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
396 z_streamp zstream;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
397
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
398 zstream = ses.keys->recv.zstream;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
399 ret = buf_new(len);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
400
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
401 zstream->avail_in = len;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
402 zstream->next_in = buf_getptr(buf, len);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
403
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
404 /* decompress the payload, incrementally resizing the output buffer */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
405 while (1) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
406
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
407 zstream->avail_out = ret->size - ret->pos;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
408 zstream->next_out = buf_getwriteptr(ret, zstream->avail_out);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
409
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
410 result = inflate(zstream, Z_SYNC_FLUSH);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
411
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
412 buf_setlen(ret, ret->size - zstream->avail_out);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
413 buf_setpos(ret, ret->len);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
414
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
415 if (result != Z_BUF_ERROR && result != Z_OK) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
416 dropbear_exit("zlib error");
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
417 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
418
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
419 if (zstream->avail_in == 0 &&
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
420 (zstream->avail_out != 0 || result == Z_BUF_ERROR)) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
421 /* we can only exit if avail_out hasn't all been used,
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
422 * and there's no remaining input */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
423 return ret;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
424 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
425
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
426 if (zstream->avail_out == 0) {
791
0bf76f54de6f Limit decompressed size
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
427 int new_size = 0;
0bf76f54de6f Limit decompressed size
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
428 if (ret->size >= RECV_MAX_PAYLOAD_LEN) {
906
4696755c4cac A few fixes for cases where compression increases payload sizes, and
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
429 /* Already been increased as large as it can go,
4696755c4cac A few fixes for cases where compression increases payload sizes, and
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
430 * yet didn't finish up the decompression */
791
0bf76f54de6f Limit decompressed size
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
431 dropbear_exit("bad packet, oversized decompressed");
0bf76f54de6f Limit decompressed size
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
432 }
0bf76f54de6f Limit decompressed size
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
433 new_size = MIN(RECV_MAX_PAYLOAD_LEN, ret->size + ZLIB_DECOMPRESS_INCR);
0bf76f54de6f Limit decompressed size
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
434 buf_resize(ret, new_size);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
435 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
436 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
437 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
438 #endif
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
439
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
440
452
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
441 /* returns 1 if the packet is a valid type during kex (see 7.1 of rfc4253) */
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
442 static int packet_is_okay_kex(unsigned char type) {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
443 if (type >= SSH_MSG_USERAUTH_REQUEST) {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
444 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
445 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
446 if (type == SSH_MSG_SERVICE_REQUEST || type == SSH_MSG_SERVICE_ACCEPT) {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
447 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
448 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
449 if (type == SSH_MSG_KEXINIT) {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
450 /* XXX should this die horribly if !dataallowed ?? */
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
451 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
452 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
453 return 1;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
454 }
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
455
452
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
456 static void enqueue_reply_packet() {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
457 struct packetlist * new_item = NULL;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
458 new_item = m_malloc(sizeof(struct packetlist));
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
459 new_item->next = NULL;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
460
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
461 new_item->payload = buf_newcopy(ses.writepayload);
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
462 buf_setpos(ses.writepayload, 0);
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
463 buf_setlen(ses.writepayload, 0);
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
464
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
465 if (ses.reply_queue_tail) {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
466 ses.reply_queue_tail->next = new_item;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
467 } else {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
468 ses.reply_queue_head = new_item;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
469 }
456
f6c999ba31da Fix delayed packet queue handling
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
470 ses.reply_queue_tail = new_item;
452
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
471 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
472
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
473 void maybe_flush_reply_queue() {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
474 struct packetlist *tmp_item = NULL, *curr_item = NULL;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
475 if (!ses.dataallowed)
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
476 {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
477 TRACE(("maybe_empty_reply_queue - no data allowed"))
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
478 return;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
479 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
480
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
481 for (curr_item = ses.reply_queue_head; curr_item; ) {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
482 CHECKCLEARTOWRITE();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
483 buf_putbytes(ses.writepayload,
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
484 curr_item->payload->data, curr_item->payload->len);
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
485
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
486 buf_free(curr_item->payload);
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
487 tmp_item = curr_item;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
488 curr_item = curr_item->next;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
489 m_free(tmp_item);
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
490 encrypt_packet();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
491 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
492 ses.reply_queue_head = ses.reply_queue_tail = NULL;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
493 }
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
494
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
495 /* encrypt the writepayload, putting into writebuf, ready for write_packet()
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
496 * to put on the wire */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
497 void encrypt_packet() {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
498
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
499 unsigned char padlen;
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
500 unsigned char blocksize, mac_size;
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
501 buffer * writebuf; /* the packet which will go on the wire. This is
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
502 encrypted in-place. */
592
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
503 unsigned char packet_type;
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
504 unsigned int len, encrypt_buf_size;
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
505 unsigned char mac_bytes[MAX_MAC_LEN];
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
506
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
507 TRACE2(("enter encrypt_packet()"))
592
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
508
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
509 buf_setpos(ses.writepayload, 0);
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
510 packet_type = buf_getbyte(ses.writepayload);
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
511 buf_setpos(ses.writepayload, 0);
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
512
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
513 TRACE2(("encrypt_packet type is %d", packet_type))
452
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
514
752
24172f555f9c Fix MAC bug which would prevent asymmetric hashes
Matt Johnston <matt@ucc.asn.au>
parents: 731
diff changeset
515 if ((!ses.dataallowed && !packet_is_okay_kex(packet_type))) {
452
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
516 /* During key exchange only particular packets are allowed.
592
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
517 Since this packet_type isn't OK we just enqueue it to send
452
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
518 after the KEX, see maybe_flush_reply_queue */
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
519 enqueue_reply_packet();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
520 return;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
521 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
522
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
523 blocksize = ses.keys->trans.algo_crypt->blocksize;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
524 mac_size = ses.keys->trans.algo_mac->hashsize;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
525
605
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
526 /* Encrypted packet len is payload+5. We need to then make sure
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
527 * there is enough space for padding or MIN_PACKET_LEN.
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
528 * Add extra 3 since we need at least 4 bytes of padding */
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
529 encrypt_buf_size = (ses.writepayload->len+4+1)
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
530 + MAX(MIN_PACKET_LEN, blocksize) + 3
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
531 /* add space for the MAC at the end */
592
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
532 + mac_size
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
533 #ifndef DISABLE_ZLIB
605
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
534 /* some extra in case 'compression' makes it larger */
906
4696755c4cac A few fixes for cases where compression increases payload sizes, and
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
535 + ZLIB_COMPRESS_EXPANSION
592
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
536 #endif
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
537 /* and an extra cleartext (stripped before transmission) byte for the
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
538 * packet type */
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
539 + 1;
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
540
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
541 writebuf = buf_new(encrypt_buf_size);
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
542 buf_setlen(writebuf, PACKET_PAYLOAD_OFF);
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
543 buf_setpos(writebuf, PACKET_PAYLOAD_OFF);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
544
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
545 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
546 /* compression */
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
547 if (is_compress_trans()) {
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
548 buf_compress(writebuf, ses.writepayload, ses.writepayload->len);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
549 } else
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
550 #endif
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
551 {
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
552 memcpy(buf_getwriteptr(writebuf, ses.writepayload->len),
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
553 buf_getptr(ses.writepayload, ses.writepayload->len),
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
554 ses.writepayload->len);
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
555 buf_incrwritepos(writebuf, ses.writepayload->len);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
556 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
557
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
558 /* finished with payload */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
559 buf_setpos(ses.writepayload, 0);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
560 buf_setlen(ses.writepayload, 0);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
561
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
562 /* length of padding - packet length must be a multiple of blocksize,
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
563 * with a minimum of 4 bytes of padding */
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
564 padlen = blocksize - (writebuf->len) % blocksize;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
565 if (padlen < 4) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
566 padlen += blocksize;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
567 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
568 /* check for min packet length */
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
569 if (writebuf->len + padlen < MIN_PACKET_LEN) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
570 padlen += blocksize;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
571 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
572
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
573 buf_setpos(writebuf, 0);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
574 /* packet length excluding the packetlength uint32 */
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
575 buf_putint(writebuf, writebuf->len + padlen - 4);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
576
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
577 /* padding len */
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
578 buf_putbyte(writebuf, padlen);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
579 /* actual padding */
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
580 buf_setpos(writebuf, writebuf->len);
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
581 buf_incrlen(writebuf, padlen);
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
582 genrandom(buf_getptr(writebuf, padlen), padlen);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
583
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
584 make_mac(ses.transseq, &ses.keys->trans, writebuf, writebuf->len, mac_bytes);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
585
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
586 /* do the actual encryption, in-place */
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
587 buf_setpos(writebuf, 0);
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
588 /* encrypt it in-place*/
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
589 len = writebuf->len;
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
590 if (ses.keys->trans.crypt_mode->encrypt(
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
591 buf_getptr(writebuf, len),
528
378a6389f88e - Don't be dumb and encrypt/decrypt in a while() loop - why did I do this??
Matt Johnston <matt@ucc.asn.au>
parents: 513
diff changeset
592 buf_getwriteptr(writebuf, len),
378a6389f88e - Don't be dumb and encrypt/decrypt in a while() loop - why did I do this??
Matt Johnston <matt@ucc.asn.au>
parents: 513
diff changeset
593 len,
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
594 &ses.keys->trans.cipher_state) != CRYPT_OK) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 592
diff changeset
595 dropbear_exit("Error encrypting");
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
596 }
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
597 buf_incrpos(writebuf, len);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
598
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
599 /* stick the MAC on it */
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
600 buf_putbytes(writebuf, mac_bytes, mac_size);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
601
592
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
602 /* The last byte of the buffer stores the cleartext packet_type. It is not
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
603 * transmitted but is used for transmit timeout purposes */
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
604 buf_putbyte(writebuf, packet_type);
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
605 /* enqueue the packet for sending. It will get freed after transmission. */
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
606 buf_setpos(writebuf, 0);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
607 enqueue(&ses.writequeue, (void*)writebuf);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
608
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
609 /* Update counts */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
610 ses.kexstate.datatrans += writebuf->len;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
611 ses.transseq++;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
612
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
613 TRACE2(("leave encrypt_packet()"))
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
614 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
615
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
616
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
617 /* Create the packet mac, and append H(seqno|clearbuf) to the output */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
618 /* output_mac must have ses.keys->trans.algo_mac->hashsize bytes. */
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
619 static void make_mac(unsigned int seqno, const struct key_context_directional * key_state,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
620 buffer * clear_buf, unsigned int clear_len,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
621 unsigned char *output_mac) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
622 unsigned char seqbuf[4];
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 194
diff changeset
623 unsigned long bufsize;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
624 hmac_state hmac;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
625
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
626 if (key_state->algo_mac->hashsize > 0) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
627 /* calculate the mac */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
628 if (hmac_init(&hmac,
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
629 key_state->hash_index,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
630 key_state->mackey,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
631 key_state->algo_mac->keysize) != CRYPT_OK) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
632 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
633 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
634
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
635 /* sequence number */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
636 STORE32H(seqno, seqbuf);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
637 if (hmac_process(&hmac, seqbuf, 4) != CRYPT_OK) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
638 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
639 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
640
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
641 /* the actual contents */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
642 buf_setpos(clear_buf, 0);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
643 if (hmac_process(&hmac,
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
644 buf_getptr(clear_buf, clear_len),
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
645 clear_len) != CRYPT_OK) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
646 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
647 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
648
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
649 bufsize = MAX_MAC_LEN;
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
650 if (hmac_done(&hmac, output_mac, &bufsize) != CRYPT_OK) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
651 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
652 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
653 }
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
654 TRACE2(("leave writemac"))
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
655 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
656
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
657 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
658 /* compresses len bytes from src, outputting to dest (starting from the
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
659 * respective current positions. */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
660 static void buf_compress(buffer * dest, buffer * src, unsigned int len) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
661
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
662 unsigned int endpos = src->pos + len;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
663 int result;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
664
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
665 TRACE2(("enter buf_compress"))
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
666
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
667 while (1) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
668
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
669 ses.keys->trans.zstream->avail_in = endpos - src->pos;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
670 ses.keys->trans.zstream->next_in =
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
671 buf_getptr(src, ses.keys->trans.zstream->avail_in);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
672
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
673 ses.keys->trans.zstream->avail_out = dest->size - dest->pos;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
674 ses.keys->trans.zstream->next_out =
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
675 buf_getwriteptr(dest, ses.keys->trans.zstream->avail_out);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
676
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
677 result = deflate(ses.keys->trans.zstream, Z_SYNC_FLUSH);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
678
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
679 buf_setpos(src, endpos - ses.keys->trans.zstream->avail_in);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
680 buf_setlen(dest, dest->size - ses.keys->trans.zstream->avail_out);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
681 buf_setpos(dest, dest->len);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
682
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
683 if (result != Z_OK) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
684 dropbear_exit("zlib error");
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
685 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
686
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
687 if (ses.keys->trans.zstream->avail_in == 0) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
688 break;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
689 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
690
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
691 dropbear_assert(ses.keys->trans.zstream->avail_out == 0);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
692
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
693 /* the buffer has been filled, we must extend. This only happens in
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
694 * unusual circumstances where the data grows in size after deflate(),
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
695 * but it is possible */
906
4696755c4cac A few fixes for cases where compression increases payload sizes, and
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
696 buf_resize(dest, dest->size + ZLIB_COMPRESS_EXPANSION);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
697
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
698 }
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
699 TRACE2(("leave buf_compress"))
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
700 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
701 #endif