annotate packet.c @ 861:e894dbc015ba DROPBEAR_2013.61test

2013.61test
author Matt Johnston <matt@ucc.asn.au>
date Thu, 14 Nov 2013 22:24:10 +0800
parents 220f55d540ae
children 4696755c4cac
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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 #define ZLIB_COMPRESS_INCR 100
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45 #define ZLIB_DECOMPRESS_INCR 1024
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46 #ifndef DISABLE_ZLIB
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47 static buffer* buf_decompress(buffer* buf, unsigned int len);
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48 static void buf_compress(buffer * dest, buffer * src, unsigned int len);
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49 #endif
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50
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51 /* non-blocking function writing out a current encrypted packet */
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52 void write_packet() {
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53
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54 int len, written;
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55 buffer * writebuf = NULL;
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56 time_t now;
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57 unsigned packet_type;
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58 int all_ignore = 1;
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59 #ifdef HAVE_WRITEV
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60 struct iovec *iov = NULL;
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61 int i;
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62 struct Link *l;
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63 #endif
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64
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65 TRACE2(("enter write_packet"))
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66 dropbear_assert(!isempty(&ses.writequeue));
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67
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68 #ifdef HAVE_WRITEV
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69 iov = m_malloc(sizeof(*iov) * ses.writequeue.count);
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70 for (l = ses.writequeue.head, i = 0; l; l = l->link, i++)
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71 {
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72 writebuf = (buffer*)l->item;
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73 packet_type = writebuf->data[writebuf->len-1];
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74 len = writebuf->len - 1 - writebuf->pos;
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75 dropbear_assert(len > 0);
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76 all_ignore &= (packet_type == SSH_MSG_IGNORE);
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77 TRACE2(("write_packet writev #%d type %d len %d/%d", i, packet_type,
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78 len, writebuf->len-1))
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79 iov[i].iov_base = buf_getptr(writebuf, len);
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80 iov[i].iov_len = len;
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81 }
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82 written = writev(ses.sock_out, iov, ses.writequeue.count);
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83 if (written < 0) {
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84 if (errno == EINTR) {
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85 m_free(iov);
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86 TRACE2(("leave writepacket: EINTR"))
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87 return;
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88 } else {
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89 dropbear_exit("Error writing");
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90 }
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91 }
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92
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93 if (written == 0) {
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94 ses.remoteclosed();
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95 }
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96
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97 while (written > 0) {
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98 writebuf = (buffer*)examine(&ses.writequeue);
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99 len = writebuf->len - 1 - writebuf->pos;
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100 if (len > written) {
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101 /* partial buffer write */
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102 buf_incrpos(writebuf, written);
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103 written = 0;
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104 } else {
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105 written -= len;
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106 dequeue(&ses.writequeue);
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107 buf_free(writebuf);
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108 }
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109 }
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110
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111 m_free(iov);
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112
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113 #else
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114 /* Get the next buffer in the queue of encrypted packets to write*/
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115 writebuf = (buffer*)examine(&ses.writequeue);
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116
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117 /* The last byte of the buffer is not to be transmitted, but is
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118 * a cleartext packet_type indicator */
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119 packet_type = writebuf->data[writebuf->len-1];
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120 len = writebuf->len - 1 - writebuf->pos;
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121 dropbear_assert(len > 0);
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122 /* Try to write as much as possible */
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123 written = write(ses.sock_out, buf_getptr(writebuf, len), len);
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124
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125 if (written < 0) {
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126 if (errno == EINTR) {
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127 TRACE2(("leave writepacket: EINTR"))
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128 return;
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129 } else {
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130 dropbear_exit("Error writing");
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131 }
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132 }
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133 all_ignore = (packet_type == SSH_MSG_IGNORE);
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134
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135 if (written == 0) {
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136 ses.remoteclosed();
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137 }
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138
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139 if (written == len) {
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diff changeset
140 /* 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
141 dequeue(&ses.writequeue);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
142 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
143 writebuf = NULL;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
144 } else {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
145 /* 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
146 buf_incrpos(writebuf, written);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
147 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
148
728
f27058078d61 Try using writev() for writing packets out to tcp
Matt Johnston <matt@ucc.asn.au>
parents: 711
diff changeset
149 #endif
f27058078d61 Try using writev() for writing packets out to tcp
Matt Johnston <matt@ucc.asn.au>
parents: 711
diff changeset
150 now = time(NULL);
f27058078d61 Try using writev() for writing packets out to tcp
Matt Johnston <matt@ucc.asn.au>
parents: 711
diff changeset
151 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
152
f27058078d61 Try using writev() for writing packets out to tcp
Matt Johnston <matt@ucc.asn.au>
parents: 711
diff changeset
153 if (!all_ignore) {
f27058078d61 Try using writev() for writing packets out to tcp
Matt Johnston <matt@ucc.asn.au>
parents: 711
diff changeset
154 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
155 }
f27058078d61 Try using writev() for writing packets out to tcp
Matt Johnston <matt@ucc.asn.au>
parents: 711
diff changeset
156
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
157 TRACE2(("leave write_packet"))
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
158 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
159
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
160 /* 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
161 * 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
162 * full portion if possible */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
163 void read_packet() {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
164
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
165 int len;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
166 unsigned int maxlen;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
167 unsigned char blocksize;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
168
731
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Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
169 TRACE2(("enter read_packet"))
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 533
diff changeset
170 blocksize = ses.keys->recv.algo_crypt->blocksize;
27
08da099e8337 - Rename common-packet.c to packet.c
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parents:
diff changeset
171
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
172 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
173 int ret;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
174 /* In the first blocksize of a packet */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
175
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
176 /* 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
177 * 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
178 ret = read_packet_init();
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
179
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
180 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
181 /* 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
182 TRACE2(("leave read_packet: packetinit done"))
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
183 return;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
184 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
185 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
186
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
187 /* 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
188 * mightn't be any available (EAGAIN) */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
189 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
190 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
191 /* 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
192 * 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
193 */
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 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
195 } 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
196 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
197
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
198 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
199 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
200 }
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 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
204 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
205 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
206 } 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
207 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
208 }
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
209 }
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
210
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 buf_incrpos(ses.readbuf, len);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
212 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
213
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
214 if ((unsigned int)len == maxlen) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
215 /* The whole packet has been read */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216 decrypt_packet();
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
217 /* The main select() loop process_packet() to
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
218 * handle the packet contents... */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
219 }
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
220 TRACE2(("leave read_packet"))
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
221 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
222
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
223 /* 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
224 * 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
225 /* 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
226 * DROPBEAR_FAILURE otherwise */
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
227 static int read_packet_init() {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229 unsigned int maxlen;
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
230 int slen;
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
231 unsigned int len;
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
232 unsigned int blocksize;
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
233 unsigned int macsize;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
234
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
235
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
236 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
237 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
238
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
239 if (ses.readbuf == NULL) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
240 /* start of a new packet */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241 ses.readbuf = buf_new(INIT_READBUF);
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
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 maxlen = blocksize - ses.readbuf->pos;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246 /* read the rest of the packet if possible */
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
247 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
248 maxlen);
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
249 if (slen == 0) {
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 27
diff changeset
250 ses.remoteclosed();
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
251 }
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
252 if (slen < 0) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
253 if (errno == EINTR) {
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
254 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
255 return DROPBEAR_FAILURE;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
256 }
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 592
diff changeset
257 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
258 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
259
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
260 buf_incrwritepos(ses.readbuf, slen);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
261
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
262 if ((unsigned int)slen != maxlen) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263 /* 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
264 return DROPBEAR_FAILURE;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
265 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
266
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
267 /* 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
268 * 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
269 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
270 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
271 buf_getwriteptr(ses.readbuf, blocksize),
502
43bbe17d6ba0 - Add Counter Mode support
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
272 blocksize,
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
273 &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
274 dropbear_exit("Error decrypting");
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
275 }
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
276 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
277
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
278 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
279
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
280
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
281 /* 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
282 if ((len > RECV_MAX_PACKET_LEN) ||
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
283 (len < MIN_PACKET_LEN + macsize) ||
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
284 ((len - macsize) % blocksize != 0)) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 592
diff changeset
285 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
286 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
287
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
288 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
289 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
290 }
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
291 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
292 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
293 return DROPBEAR_SUCCESS;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
294 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
295
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
296 /* handle the received packet */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
297 void decrypt_packet() {
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 unsigned char blocksize;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
300 unsigned char macsize;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
301 unsigned int padlen;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
302 unsigned int len;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
303
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
304 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
305 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
306 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
307
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
308 ses.kexstate.datarecv += ses.readbuf->len;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
309
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
310 /* 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
311 buf_setpos(ses.readbuf, blocksize);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
312
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
313 /* 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
314 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
315 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
316 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
317 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
318 len,
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
319 &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
320 dropbear_exit("Error decrypting");
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
321 }
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 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
323
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
324 /* 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
325 if (checkmac() != DROPBEAR_SUCCESS) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
326 dropbear_exit("Integrity error");
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
327 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
328
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
329 /* 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
330 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
331 padlen = buf_getbyte(ses.readbuf);
27
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 /* payload length */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
334 /* - 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
335 len = ses.readbuf->len - padlen - 4 - 1 - macsize;
448
9c61e7af0156 Rearrange the channel buffer sizes into three neat use-editable values in
Matt Johnston <matt@ucc.asn.au>
parents: 426
diff changeset
336 if ((len > RECV_MAX_PAYLOAD_LEN) || (len < 1)) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 592
diff changeset
337 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
338 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
339
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
340 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
341
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
342 #ifndef DISABLE_ZLIB
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
343 if (is_compress_recv()) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
344 /* decompress */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
345 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
346 } else
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
347 #endif
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
348 {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
349 /* copy payload */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
350 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
351 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
352 buf_incrlen(ses.payload, len);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
353 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
354
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
355 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
356 ses.readbuf = NULL;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
357 buf_setpos(ses.payload, 0);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
358
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
359 ses.recvseq++;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
360
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
361 TRACE2(("leave decrypt_packet"))
27
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
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
364 /* 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
365 * 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
366 static int checkmac() {
27
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 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
369 unsigned int mac_size, contents_len;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
370
752
24172f555f9c Fix MAC bug which would prevent asymmetric hashes
Matt Johnston <matt@ucc.asn.au>
parents: 731
diff changeset
371 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
372 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
373
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
374 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
375 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
376
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
377 /* 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
378 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
379 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
380 return DROPBEAR_FAILURE;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
381 } else {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
382 return DROPBEAR_SUCCESS;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
383 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
384 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
385
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
386 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
387 /* 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
388 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
389
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
390 int result;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
391 buffer * ret;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
392 z_streamp zstream;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
393
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
394 zstream = ses.keys->recv.zstream;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
395 ret = buf_new(len);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
396
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
397 zstream->avail_in = len;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
398 zstream->next_in = buf_getptr(buf, len);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
399
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
400 /* 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
401 while (1) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
402
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
403 zstream->avail_out = ret->size - ret->pos;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
404 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
405
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
406 result = inflate(zstream, Z_SYNC_FLUSH);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
407
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
408 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
409 buf_setpos(ret, ret->len);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
410
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
411 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
412 dropbear_exit("zlib error");
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
413 }
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 (zstream->avail_in == 0 &&
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
416 (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
417 /* 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
418 * and there's no remaining input */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
419 return ret;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
420 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
421
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
422 if (zstream->avail_out == 0) {
791
0bf76f54de6f Limit decompressed size
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
423 int new_size = 0;
0bf76f54de6f Limit decompressed size
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
424 if (ret->size >= RECV_MAX_PAYLOAD_LEN) {
0bf76f54de6f Limit decompressed size
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
425 dropbear_exit("bad packet, oversized decompressed");
0bf76f54de6f Limit decompressed size
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
426 }
0bf76f54de6f Limit decompressed size
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
427 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
428 buf_resize(ret, new_size);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
429 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
430 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
431 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
432 #endif
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
433
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
434
452
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
435 /* 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
436 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
437 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
438 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
439 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
440 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
441 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
442 }
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_KEXINIT) {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
444 /* 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
445 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
446 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
447 return 1;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
448 }
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
449
452
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
450 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
451 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
452 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
453 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
454
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
455 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
456 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
457 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
458
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
459 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
460 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
461 } else {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
462 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
463 }
456
f6c999ba31da Fix delayed packet queue handling
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
464 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
465 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
466
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
467 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
468 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
469 if (!ses.dataallowed)
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
470 {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
471 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
472 return;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
473 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
474
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
475 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
476 CHECKCLEARTOWRITE();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
477 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
478 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
479
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
480 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
481 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
482 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
483 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
484 encrypt_packet();
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 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
487 }
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
488
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
489 /* 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
490 * to put on the wire */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
491 void encrypt_packet() {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
492
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
493 unsigned char padlen;
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
494 unsigned char blocksize, mac_size;
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
495 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
496 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
497 unsigned char packet_type;
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
498 unsigned int len, encrypt_buf_size;
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
499 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
500
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
501 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
502
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 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
504 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
505 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
506
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
507 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
508
752
24172f555f9c Fix MAC bug which would prevent asymmetric hashes
Matt Johnston <matt@ucc.asn.au>
parents: 731
diff changeset
509 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
510 /* 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
511 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
512 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
513 enqueue_reply_packet();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
514 return;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
515 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
516
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
517 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
518 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
519
605
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
520 /* 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
521 * 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
522 * 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
523 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
524 + 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
525 /* 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
526 + 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
527 #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
528 /* some extra in case 'compression' makes it larger */
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
529 + ZLIB_COMPRESS_INCR
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
530 #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
531 /* 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
532 * 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
533 + 1;
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
534
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
535 writebuf = buf_new(encrypt_buf_size);
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
536 buf_setlen(writebuf, PACKET_PAYLOAD_OFF);
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
537 buf_setpos(writebuf, PACKET_PAYLOAD_OFF);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
538
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
539 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
540 /* compression */
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
541 if (is_compress_trans()) {
605
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
542 int compress_delta;
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
543 buf_compress(writebuf, ses.writepayload, ses.writepayload->len);
605
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
544 compress_delta = (writebuf->len - PACKET_PAYLOAD_OFF) - ses.writepayload->len;
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
545
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
546 /* Handle the case where 'compress' increased the size. */
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
547 if (compress_delta > ZLIB_COMPRESS_INCR) {
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
548 buf_resize(writebuf, writebuf->size + compress_delta);
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
549 }
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
550 } else
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
551 #endif
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
552 {
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
553 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
554 buf_getptr(ses.writepayload, ses.writepayload->len),
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
555 ses.writepayload->len);
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
556 buf_incrwritepos(writebuf, ses.writepayload->len);
27
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
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
559 /* finished with payload */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
560 buf_setpos(ses.writepayload, 0);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
561 buf_setlen(ses.writepayload, 0);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
562
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
563 /* 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
564 * 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
565 padlen = blocksize - (writebuf->len) % blocksize;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
566 if (padlen < 4) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
567 padlen += blocksize;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
568 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
569 /* check for min packet length */
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
570 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
571 padlen += blocksize;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
572 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
573
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
574 buf_setpos(writebuf, 0);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
575 /* 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
576 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
577
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
578 /* padding len */
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
579 buf_putbyte(writebuf, padlen);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
580 /* actual padding */
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
581 buf_setpos(writebuf, writebuf->len);
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
582 buf_incrlen(writebuf, padlen);
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
583 genrandom(buf_getptr(writebuf, padlen), padlen);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
584
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
585 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
586
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
587 /* do the actual encryption, in-place */
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
588 buf_setpos(writebuf, 0);
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
589 /* encrypt it in-place*/
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
590 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
591 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
592 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
593 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
594 len,
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
595 &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
596 dropbear_exit("Error encrypting");
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
597 }
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
598 buf_incrpos(writebuf, len);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
599
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
600 /* stick the MAC on it */
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
601 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
602
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
603 /* 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
604 * 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
605 buf_putbyte(writebuf, packet_type);
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
606 /* 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
607 buf_setpos(writebuf, 0);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
608 enqueue(&ses.writequeue, (void*)writebuf);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
609
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
610 /* Update counts */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
611 ses.kexstate.datatrans += writebuf->len;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
612 ses.transseq++;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
613
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
614 TRACE2(("leave encrypt_packet()"))
27
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
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
618 /* 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
619 /* 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
620 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
621 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
622 unsigned char *output_mac) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
623 unsigned char seqbuf[4];
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 194
diff changeset
624 unsigned long bufsize;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
625 hmac_state hmac;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
626
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
627 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
628 /* calculate the mac */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
629 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
630 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
631 key_state->mackey,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
632 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
633 dropbear_exit("HMAC error");
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
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
636 /* sequence number */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
637 STORE32H(seqno, seqbuf);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
638 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
639 dropbear_exit("HMAC error");
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
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
642 /* 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
643 buf_setpos(clear_buf, 0);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
644 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
645 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
646 clear_len) != CRYPT_OK) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
647 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
648 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
649
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
650 bufsize = MAX_MAC_LEN;
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
651 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
652 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
653 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
654 }
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
655 TRACE2(("leave writemac"))
27
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
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
658 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
659 /* 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
660 * respective current positions. */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
661 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
662
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
663 unsigned int endpos = src->pos + len;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
664 int result;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
665
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
666 TRACE2(("enter buf_compress"))
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
667
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
668 while (1) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
669
534
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->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
671 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
672 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
673
534
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->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
675 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
676 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
677
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
678 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
679
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
680 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
681 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
682 buf_setpos(dest, dest->len);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
683
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
684 if (result != Z_OK) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
685 dropbear_exit("zlib error");
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
686 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
687
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
688 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
689 break;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
690 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
691
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
692 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
693
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
694 /* 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
695 * 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
696 * but it is possible */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
697 buf_resize(dest, dest->size + ZLIB_COMPRESS_INCR);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
698
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
699 }
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
700 TRACE2(("leave buf_compress"))
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
701 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
702 #endif