annotate packet.c @ 1761:4b984c42372d DROPBEAR_2020.81

Changelog for 2020.81
author Matt Johnston <matt@ucc.asn.au>
date Thu, 29 Oct 2020 21:35:50 +0800
parents 3b9b427925a0
children
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08da099e8337 - Rename common-packet.c to packet.c
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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
08da099e8337 - Rename common-packet.c to packet.c
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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,
08da099e8337 - Rename common-packet.c to packet.c
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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 #include "netio.h"
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38 #include "runopts.h"
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39
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40 static int read_packet_init(void);
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41 static void make_mac(unsigned int seqno, const struct key_context_directional * key_state,
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42 buffer * clear_buf, unsigned int clear_len,
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43 unsigned char *output_mac);
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44 static int checkmac(void);
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45
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46 /* For exact details see http://www.zlib.net/zlib_tech.html
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47 * 5 bytes per 16kB block, plus 6 bytes for the stream.
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48 * We might allocate 5 unnecessary bytes here if it's an
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49 * exact multiple. */
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50 #define ZLIB_COMPRESS_EXPANSION (((RECV_MAX_PAYLOAD_LEN/16384)+1)*5 + 6)
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51 #define ZLIB_DECOMPRESS_INCR 1024
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52 #ifndef DISABLE_ZLIB
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53 static buffer* buf_decompress(const buffer* buf, unsigned int len);
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54 static void buf_compress(buffer * dest, buffer * src, unsigned int len);
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55 #endif
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56
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57 /* non-blocking function writing out a current encrypted packet */
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58 void write_packet() {
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59
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60 ssize_t written;
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61 #if defined(HAVE_WRITEV) && (defined(IOV_MAX) || defined(UIO_MAXIOV))
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62 /* 50 is somewhat arbitrary */
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63 unsigned int iov_count = 50;
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64 struct iovec iov[50];
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65 #else
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66 int len;
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67 buffer* writebuf;
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68 #endif
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69
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70 TRACE2(("enter write_packet"))
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71 dropbear_assert(!isempty(&ses.writequeue));
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72
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73 #if defined(HAVE_WRITEV) && (defined(IOV_MAX) || defined(UIO_MAXIOV))
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74
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75 packet_queue_to_iovec(&ses.writequeue, iov, &iov_count);
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76 /* This may return EAGAIN. The main loop sometimes
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77 calls write_packet() without bothering to test with select() since
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78 it's likely to be necessary */
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79 #if DROPBEAR_FUZZ
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80 if (fuzz.fuzzing) {
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81 /* pretend to write one packet at a time */
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82 /* TODO(fuzz): randomise amount written based on the fuzz input */
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83 written = iov[0].iov_len;
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84 }
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85 else
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86 #endif
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87 {
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88 written = writev(ses.sock_out, iov, iov_count);
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89 if (written < 0) {
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90 if (errno == EINTR || errno == EAGAIN) {
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91 TRACE2(("leave write_packet: EINTR"))
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92 return;
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93 } else {
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94 dropbear_exit("Error writing: %s", strerror(errno));
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95 }
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96 }
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97 }
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98
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99 packet_queue_consume(&ses.writequeue, written);
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100 ses.writequeue_len -= written;
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101
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102 if (written == 0) {
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103 ses.remoteclosed();
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104 }
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105
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106 #else /* No writev () */
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107 #if DROPBEAR_FUZZ
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108 _Static_assert(0, "No fuzzing code for no-writev writes");
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109 #endif
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110 /* Get the next buffer in the queue of encrypted packets to write*/
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111 writebuf = (buffer*)examine(&ses.writequeue);
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112
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113 len = writebuf->len - writebuf->pos;
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114 dropbear_assert(len > 0);
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115 /* Try to write as much as possible */
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116 written = write(ses.sock_out, buf_getptr(writebuf, len), len);
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117
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118 if (written < 0) {
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119 if (errno == EINTR || errno == EAGAIN) {
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120 TRACE2(("leave writepacket: EINTR"))
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121 return;
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122 } else {
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123 dropbear_exit("Error writing: %s", strerror(errno));
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124 }
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125 }
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126
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127 if (written == 0) {
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128 ses.remoteclosed();
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129 }
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130
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131 ses.writequeue_len -= written;
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132
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133 if (written == len) {
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134 /* We've finished with the packet, free it */
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135 dequeue(&ses.writequeue);
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136 buf_free(writebuf);
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137 writebuf = NULL;
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138 } else {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
139 /* 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
140 buf_incrpos(writebuf, written);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
141 }
934
68723d66dec6 Be more careful in case a platform doesn't define UIO_MAXIOV nor IOV_MAX
Matt Johnston <matt@ucc.asn.au>
parents: 933
diff changeset
142 #endif /* writev */
27
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
143
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
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parents: 728
diff changeset
144 TRACE2(("leave write_packet"))
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
145 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
146
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
147 /* 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
148 * 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
149 * full portion if possible */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
150 void read_packet() {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
151
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
152 int len;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
153 unsigned int maxlen;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
154 unsigned char blocksize;
08da099e8337 - Rename common-packet.c to packet.c
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parents:
diff changeset
155
731
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Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
156 TRACE2(("enter read_packet"))
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 533
diff changeset
157 blocksize = ses.keys->recv.algo_crypt->blocksize;
27
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diff changeset
158
08da099e8337 - Rename common-packet.c to packet.c
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parents:
diff changeset
159 if (ses.readbuf == NULL || ses.readbuf->len < blocksize) {
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 533
diff changeset
160 int ret;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
161 /* In the first blocksize of a packet */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
162
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
163 /* 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
164 * find the length of the whole packet */
534
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parents: 533
diff changeset
165 ret = read_packet_init();
27
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diff changeset
166
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 533
diff changeset
167 if (ret == DROPBEAR_FAILURE) {
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 533
diff changeset
168 /* didn't read enough to determine the length */
731
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diff changeset
169 TRACE2(("leave read_packet: packetinit done"))
27
08da099e8337 - Rename common-packet.c to packet.c
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parents:
diff changeset
170 return;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
171 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
172 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
173
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
174 /* 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
175 * mightn't be any available (EAGAIN) */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
176 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
177 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
178 /* 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
179 * 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
180 */
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
181 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
182 } 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
183 len = read(ses.sock_in, buf_getptr(ses.readbuf, maxlen), maxlen);
27
08da099e8337 - Rename common-packet.c to packet.c
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parents:
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184
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
185 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
186 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
187 }
27
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parents:
diff changeset
188
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
189 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
190 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
191 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
192 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
193 } 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
194 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
195 }
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
196 }
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
197
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be
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parents: 623
diff changeset
198 buf_incrpos(ses.readbuf, len);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
199 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
200
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
201 if ((unsigned int)len == maxlen) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
202 /* The whole packet has been read */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
203 decrypt_packet();
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
204 /* The main select() loop process_packet() to
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
205 * handle the packet contents... */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
206 }
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
207 TRACE2(("leave read_packet"))
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
208 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
209
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
210 /* 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
211 * 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
212 /* 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
213 * DROPBEAR_FAILURE otherwise */
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
214 static int read_packet_init() {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
215
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216 unsigned int maxlen;
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
217 int slen;
1672
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
218 unsigned int len, plen;
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
219 unsigned int blocksize;
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
220 unsigned int macsize;
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
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
223 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
224 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
225
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
226 if (ses.readbuf == NULL) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
227 /* start of a new packet */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228 ses.readbuf = buf_new(INIT_READBUF);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
230
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
231 maxlen = blocksize - ses.readbuf->pos;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
232
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
233 /* read the rest of the packet if possible */
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
234 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
235 maxlen);
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
236 if (slen == 0) {
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 27
diff changeset
237 ses.remoteclosed();
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238 }
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
239 if (slen < 0) {
957
c4f138dae2fd Test for EAGAIN too
Matt Johnston <matt@ucc.asn.au>
parents: 939
diff changeset
240 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
241 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
242 return DROPBEAR_FAILURE;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243 }
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 592
diff changeset
244 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
245 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
247 buf_incrwritepos(ses.readbuf, slen);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
248
568
005530560594 Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents: 556
diff changeset
249 if ((unsigned int)slen != maxlen) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250 /* 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
251 return DROPBEAR_FAILURE;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
253
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
254 /* 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
255 * 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
256 buf_setpos(ses.readbuf, 0);
1672
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
257 #if DROPBEAR_AEAD_MODE
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
258 if (ses.keys->recv.crypt_mode->aead_crypt) {
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
259 if (ses.keys->recv.crypt_mode->aead_getlength(ses.recvseq,
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
260 buf_getptr(ses.readbuf, blocksize), &plen,
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
261 blocksize,
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
262 &ses.keys->recv.cipher_state) != CRYPT_OK) {
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
263 dropbear_exit("Error decrypting");
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
264 }
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
265 len = plen + 4 + macsize;
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
266 } else
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
267 #endif
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
268 {
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
269 if (ses.keys->recv.crypt_mode->decrypt(buf_getptr(ses.readbuf, blocksize),
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
270 buf_getwriteptr(ses.readbuf, blocksize),
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
271 blocksize,
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
272 &ses.keys->recv.cipher_state) != CRYPT_OK) {
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
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diff changeset
273 dropbear_exit("Error decrypting");
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parents: 1632
diff changeset
274 }
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
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parents: 1632
diff changeset
275 plen = buf_getint(ses.readbuf) + 4;
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diff changeset
276 len = plen + macsize;
27
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diff changeset
277 }
08da099e8337 - Rename common-packet.c to packet.c
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parents:
diff changeset
278
990
e3614649b1f5 Integrity error (bad packet size %u) negative length
Fedor Brunner <fedor.brunner@azet.sk>
parents: 957
diff changeset
279 TRACE2(("packet size is %u, block %u mac %u", len, blocksize, macsize))
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 533
diff changeset
280
27
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parents:
diff changeset
281
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parents:
diff changeset
282 /* 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
283 if ((len > RECV_MAX_PACKET_LEN) ||
1672
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diff changeset
284 (plen < blocksize) ||
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
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parents: 1632
diff changeset
285 (plen % blocksize != 0)) {
990
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parents: 957
diff changeset
286 dropbear_exit("Integrity error (bad packet size %u)", len);
27
08da099e8337 - Rename common-packet.c to packet.c
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parents:
diff changeset
287 }
08da099e8337 - Rename common-packet.c to packet.c
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diff changeset
288
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
289 if (len > ses.readbuf->size) {
1057
16584026a1f0 allocate buffer and data in a single allocation
Matt Johnston <matt@ucc.asn.au>
parents: 1055
diff changeset
290 ses.readbuf = buf_resize(ses.readbuf, len);
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 533
diff changeset
291 }
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
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diff changeset
292 buf_setlen(ses.readbuf, len);
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 533
diff changeset
293 buf_setpos(ses.readbuf, blocksize);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 533
diff changeset
294 return DROPBEAR_SUCCESS;
27
08da099e8337 - Rename common-packet.c to packet.c
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parents:
diff changeset
295 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
296
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parents:
diff changeset
297 /* handle the received packet */
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parents:
diff changeset
298 void decrypt_packet() {
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diff changeset
299
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parents:
diff changeset
300 unsigned char blocksize;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
301 unsigned char macsize;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
302 unsigned int padlen;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
303 unsigned int len;
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parents:
diff changeset
304
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
305 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
306 blocksize = ses.keys->recv.algo_crypt->blocksize;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
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parents: 533
diff changeset
307 macsize = ses.keys->recv.algo_mac->hashsize;
27
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parents:
diff changeset
308
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
309 ses.kexstate.datarecv += ses.readbuf->len;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
310
1672
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Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
311 #if DROPBEAR_AEAD_MODE
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
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parents: 1632
diff changeset
312 if (ses.keys->recv.crypt_mode->aead_crypt) {
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
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parents: 1632
diff changeset
313 /* first blocksize is not decrypted yet */
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parents: 1632
diff changeset
314 buf_setpos(ses.readbuf, 0);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
315
1672
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
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parents: 1632
diff changeset
316 /* decrypt it in-place */
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
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parents: 1632
diff changeset
317 len = ses.readbuf->len - macsize - ses.readbuf->pos;
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
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parents: 1632
diff changeset
318 if (ses.keys->recv.crypt_mode->aead_crypt(ses.recvseq,
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
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parents: 1632
diff changeset
319 buf_getptr(ses.readbuf, len + macsize),
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
320 buf_getwriteptr(ses.readbuf, len),
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Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
321 len, macsize,
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
322 &ses.keys->recv.cipher_state, LTC_DECRYPT) != CRYPT_OK) {
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
323 dropbear_exit("Error decrypting");
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
324 }
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
325 buf_incrpos(ses.readbuf, len);
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
326 } else
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
327 #endif
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
328 {
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
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parents: 1632
diff changeset
329 /* we've already decrypted the first blocksize in read_packet_init */
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
330 buf_setpos(ses.readbuf, blocksize);
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
331
1672
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
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parents: 1632
diff changeset
332 /* decrypt it in-place */
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
333 len = ses.readbuf->len - macsize - ses.readbuf->pos;
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
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parents: 1632
diff changeset
334 if (ses.keys->recv.crypt_mode->decrypt(
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
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parents: 1632
diff changeset
335 buf_getptr(ses.readbuf, len),
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
336 buf_getwriteptr(ses.readbuf, len),
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
337 len,
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
338 &ses.keys->recv.cipher_state) != CRYPT_OK) {
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
339 dropbear_exit("Error decrypting");
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
340 }
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
341 buf_incrpos(ses.readbuf, len);
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
342
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
343 /* check the hmac */
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
344 if (checkmac() != DROPBEAR_SUCCESS) {
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
345 dropbear_exit("Integrity error");
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
346 }
1751
3b9b427925a0 Load password and key for client fuzzer.
Matt Johnston <matt@ucc.asn.au>
parents: 1672
diff changeset
347
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
348 }
1751
3b9b427925a0 Load password and key for client fuzzer.
Matt Johnston <matt@ucc.asn.au>
parents: 1672
diff changeset
349
3b9b427925a0 Load password and key for client fuzzer.
Matt Johnston <matt@ucc.asn.au>
parents: 1672
diff changeset
350 #if DROPBEAR_FUZZ
3b9b427925a0 Load password and key for client fuzzer.
Matt Johnston <matt@ucc.asn.au>
parents: 1672
diff changeset
351 fuzz_dump(ses.readbuf->data, ses.readbuf->len);
3b9b427925a0 Load password and key for client fuzzer.
Matt Johnston <matt@ucc.asn.au>
parents: 1672
diff changeset
352 #endif
27
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 /* 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
355 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
356 padlen = buf_getbyte(ses.readbuf);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
357
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
358 /* payload length */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
359 /* - 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
360 len = ses.readbuf->len - padlen - 4 - 1 - macsize;
906
4696755c4cac A few fixes for cases where compression increases payload sizes, and
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
361 if ((len > RECV_MAX_PAYLOAD_LEN+ZLIB_COMPRESS_EXPANSION) || (len < 1)) {
990
e3614649b1f5 Integrity error (bad packet size %u) negative length
Fedor Brunner <fedor.brunner@azet.sk>
parents: 957
diff changeset
362 dropbear_exit("Bad packet size %u", len);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
363 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
364
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
365 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
366
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
367 #ifndef DISABLE_ZLIB
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
368 if (is_compress_recv()) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
369 /* decompress */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
370 ses.payload = buf_decompress(ses.readbuf, len);
1055
4d7b4c5526c5 A bit of a bodge to avoid memcpy if zlib is disabled
Matt Johnston <matt@ucc.asn.au>
parents: 1032
diff changeset
371 buf_setpos(ses.payload, 0);
4d7b4c5526c5 A bit of a bodge to avoid memcpy if zlib is disabled
Matt Johnston <matt@ucc.asn.au>
parents: 1032
diff changeset
372 ses.payload_beginning = 0;
4d7b4c5526c5 A bit of a bodge to avoid memcpy if zlib is disabled
Matt Johnston <matt@ucc.asn.au>
parents: 1032
diff changeset
373 buf_free(ses.readbuf);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
374 } else
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
375 #endif
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
376 {
1055
4d7b4c5526c5 A bit of a bodge to avoid memcpy if zlib is disabled
Matt Johnston <matt@ucc.asn.au>
parents: 1032
diff changeset
377 ses.payload = ses.readbuf;
4d7b4c5526c5 A bit of a bodge to avoid memcpy if zlib is disabled
Matt Johnston <matt@ucc.asn.au>
parents: 1032
diff changeset
378 ses.payload_beginning = ses.payload->pos;
4d7b4c5526c5 A bit of a bodge to avoid memcpy if zlib is disabled
Matt Johnston <matt@ucc.asn.au>
parents: 1032
diff changeset
379 buf_setlen(ses.payload, ses.payload->pos + len);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
380 }
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
381 ses.readbuf = NULL;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
382
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
383 ses.recvseq++;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
384
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
385 TRACE2(("leave decrypt_packet"))
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
386 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
387
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
388 /* 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
389 * 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
390 static int checkmac() {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
391
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
392 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
393 unsigned int mac_size, contents_len;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
394
752
24172f555f9c Fix MAC bug which would prevent asymmetric hashes
Matt Johnston <matt@ucc.asn.au>
parents: 731
diff changeset
395 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
396 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
397
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
398 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
399 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
400
1558
2f64cb3d3007 - #if not #ifdef for DROPBEAR_FUZZ
Matt Johnston <matt@ucc.asn.au>
parents: 1511
diff changeset
401 #if DROPBEAR_FUZZ
1357
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1348
diff changeset
402 if (fuzz.fuzzing) {
1597
8f7b6f75aa58 fix uninitialised memory in fuzzer codepath
Matt Johnston <matt@ucc.asn.au>
parents: 1577
diff changeset
403 /* fail 1 in 2000 times to test error path. */
8f7b6f75aa58 fix uninitialised memory in fuzzer codepath
Matt Johnston <matt@ucc.asn.au>
parents: 1577
diff changeset
404 unsigned int value = 0;
8f7b6f75aa58 fix uninitialised memory in fuzzer codepath
Matt Johnston <matt@ucc.asn.au>
parents: 1577
diff changeset
405 if (mac_size > sizeof(value)) {
8f7b6f75aa58 fix uninitialised memory in fuzzer codepath
Matt Johnston <matt@ucc.asn.au>
parents: 1577
diff changeset
406 memcpy(&value, mac_bytes, sizeof(value));
8f7b6f75aa58 fix uninitialised memory in fuzzer codepath
Matt Johnston <matt@ucc.asn.au>
parents: 1577
diff changeset
407 }
1408
27e65d3aed5f fix checkmac always failing pre-kex
Matt Johnston <matt@ucc.asn.au>
parents: 1357
diff changeset
408 if (value % 2000 == 99) {
1357
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1348
diff changeset
409 return DROPBEAR_FAILURE;
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1348
diff changeset
410 }
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1348
diff changeset
411 return DROPBEAR_SUCCESS;
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1348
diff changeset
412 }
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1348
diff changeset
413 #endif
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1348
diff changeset
414
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
415 /* 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
416 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
417 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
418 return DROPBEAR_FAILURE;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
419 } else {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
420 return DROPBEAR_SUCCESS;
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 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
423
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
424 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
425 /* returns a pointer to a newly created buffer */
1459
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1276
diff changeset
426 static buffer* buf_decompress(const buffer* buf, unsigned int len) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
427
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
428 int result;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
429 buffer * ret;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
430 z_streamp zstream;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
431
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
432 zstream = ses.keys->recv.zstream;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
433 ret = buf_new(len);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
434
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
435 zstream->avail_in = len;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
436 zstream->next_in = buf_getptr(buf, len);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
437
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
438 /* 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
439 while (1) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
440
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
441 zstream->avail_out = ret->size - ret->pos;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
442 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
443
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
444 result = inflate(zstream, Z_SYNC_FLUSH);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
445
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
446 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
447 buf_setpos(ret, ret->len);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
448
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
449 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
450 dropbear_exit("zlib error");
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
451 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
452
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
453 if (zstream->avail_in == 0 &&
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
454 (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
455 /* 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
456 * and there's no remaining input */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
457 return ret;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
458 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
459
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
460 if (zstream->avail_out == 0) {
791
0bf76f54de6f Limit decompressed size
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
461 int new_size = 0;
0bf76f54de6f Limit decompressed size
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
462 if (ret->size >= RECV_MAX_PAYLOAD_LEN) {
906
4696755c4cac A few fixes for cases where compression increases payload sizes, and
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
463 /* Already been increased as large as it can go,
4696755c4cac A few fixes for cases where compression increases payload sizes, and
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
464 * yet didn't finish up the decompression */
791
0bf76f54de6f Limit decompressed size
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
465 dropbear_exit("bad packet, oversized decompressed");
0bf76f54de6f Limit decompressed size
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
466 }
0bf76f54de6f Limit decompressed size
Matt Johnston <matt@ucc.asn.au>
parents: 753
diff changeset
467 new_size = MIN(RECV_MAX_PAYLOAD_LEN, ret->size + ZLIB_DECOMPRESS_INCR);
1057
16584026a1f0 allocate buffer and data in a single allocation
Matt Johnston <matt@ucc.asn.au>
parents: 1055
diff changeset
468 ret = buf_resize(ret, new_size);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
469 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
470 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
471 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
472 #endif
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
473
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
474
452
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
475 /* 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
476 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
477 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
478 return 0;
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 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
481 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
482 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
483 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
484 /* 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
485 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
486 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
487 return 1;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
488 }
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
489
452
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
490 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
491 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
492 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
493 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
494
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
495 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
496 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
497 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
498
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
499 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
500 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
501 } else {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
502 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
503 }
456
f6c999ba31da Fix delayed packet queue handling
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
504 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
505 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
506
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
507 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
508 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
509 if (!ses.dataallowed)
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
510 {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
511 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
512 return;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
513 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
514
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
515 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
516 CHECKCLEARTOWRITE();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
517 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
518 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
519
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
520 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
521 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
522 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
523 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
524 encrypt_packet();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
525 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
526 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
527 }
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
528
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
529 /* 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
530 * to put on the wire */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
531 void encrypt_packet() {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
532
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
533 unsigned char padlen;
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
534 unsigned char blocksize, mac_size;
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
535 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
536 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
537 unsigned char packet_type;
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
538 unsigned int len, encrypt_buf_size;
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
539 unsigned char mac_bytes[MAX_MAC_LEN];
939
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 934
diff changeset
540
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 934
diff changeset
541 time_t now;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
542
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
543 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
544
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
545 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
546 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
547 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
548
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
549 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
550
752
24172f555f9c Fix MAC bug which would prevent asymmetric hashes
Matt Johnston <matt@ucc.asn.au>
parents: 731
diff changeset
551 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
552 /* 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
553 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
554 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
555 enqueue_reply_packet();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
556 return;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
557 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
558
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
559 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
560 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
561
605
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
562 /* 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
563 * 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
564 * 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
565 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
566 + 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
567 /* 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
568 + 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
569 #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
570 /* some extra in case 'compression' makes it larger */
906
4696755c4cac A few fixes for cases where compression increases payload sizes, and
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
571 + ZLIB_COMPRESS_EXPANSION
592
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
572 #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
573 /* 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
574 * 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
575 + 1;
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
576
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
577 writebuf = buf_new(encrypt_buf_size);
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
578 buf_setlen(writebuf, PACKET_PAYLOAD_OFF);
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
579 buf_setpos(writebuf, PACKET_PAYLOAD_OFF);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
580
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
581 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
582 /* compression */
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
583 if (is_compress_trans()) {
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
584 buf_compress(writebuf, ses.writepayload, ses.writepayload->len);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
585 } else
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
586 #endif
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
587 {
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
588 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
589 buf_getptr(ses.writepayload, ses.writepayload->len),
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
590 ses.writepayload->len);
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
591 buf_incrwritepos(writebuf, ses.writepayload->len);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
592 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
593
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
594 /* finished with payload */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
595 buf_setpos(ses.writepayload, 0);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
596 buf_setlen(ses.writepayload, 0);
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
597
1672
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
598 /* length of padding - packet length excluding the packetlength uint32
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
599 * field in aead mode must be a multiple of blocksize, with a minimum of
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
600 * 4 bytes of padding */
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
601 len = writebuf->len;
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
602 #if DROPBEAR_AEAD_MODE
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
603 if (ses.keys->trans.crypt_mode->aead_crypt) {
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
604 len -= 4;
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
605 }
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
606 #endif
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
607 padlen = blocksize - len % blocksize;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
608 if (padlen < 4) {
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
609 padlen += blocksize;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
610 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
611 /* check for min packet length */
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
612 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
613 padlen += blocksize;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
614 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
615
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
616 buf_setpos(writebuf, 0);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
617 /* 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
618 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
619
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
620 /* padding len */
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
621 buf_putbyte(writebuf, padlen);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
622 /* actual padding */
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
623 buf_setpos(writebuf, writebuf->len);
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
624 buf_incrlen(writebuf, padlen);
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
625 genrandom(buf_getptr(writebuf, padlen), padlen);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
626
1672
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
627 #if DROPBEAR_AEAD_MODE
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
628 if (ses.keys->trans.crypt_mode->aead_crypt) {
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
629 /* do the actual encryption, in-place */
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
630 buf_setpos(writebuf, 0);
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
631 /* encrypt it in-place*/
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
632 len = writebuf->len;
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
633 buf_incrlen(writebuf, mac_size);
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
634 if (ses.keys->trans.crypt_mode->aead_crypt(ses.transseq,
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
635 buf_getptr(writebuf, len),
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
636 buf_getwriteptr(writebuf, len + mac_size),
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
637 len, mac_size,
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
638 &ses.keys->trans.cipher_state, LTC_ENCRYPT) != CRYPT_OK) {
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
639 dropbear_exit("Error encrypting");
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
640 }
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
641 buf_incrpos(writebuf, len + mac_size);
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
642 } else
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
643 #endif
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
644 {
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
645 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
646
1672
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
647 /* do the actual encryption, in-place */
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
648 buf_setpos(writebuf, 0);
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
649 /* encrypt it in-place*/
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
650 len = writebuf->len;
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
651 if (ses.keys->trans.crypt_mode->encrypt(
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
652 buf_getptr(writebuf, len),
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
653 buf_getwriteptr(writebuf, len),
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
654 len,
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
655 &ses.keys->trans.cipher_state) != CRYPT_OK) {
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
656 dropbear_exit("Error encrypting");
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
657 }
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
658 buf_incrpos(writebuf, len);
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
659
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
660 /* stick the MAC on it */
3a97f14c0235 Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents: 1632
diff changeset
661 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
662 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
663
1074
10f198d4a308 Make main socket nonblocking. Limit writequeue size.
Matt Johnston <matt@ucc.asn.au>
parents: 1072
diff changeset
664 /* Update counts */
10f198d4a308 Make main socket nonblocking. Limit writequeue size.
Matt Johnston <matt@ucc.asn.au>
parents: 1072
diff changeset
665 ses.kexstate.datatrans += writebuf->len;
10f198d4a308 Make main socket nonblocking. Limit writequeue size.
Matt Johnston <matt@ucc.asn.au>
parents: 1072
diff changeset
666
1577
399d8eb961b5 get rid of unused packet_type in encrypted write queue
Matt Johnston <matt@ucc.asn.au>
parents: 1559
diff changeset
667 writebuf_enqueue(writebuf);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
668
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
669 /* Update counts */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
670 ses.transseq++;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
671
939
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 934
diff changeset
672 now = monotonic_now();
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 934
diff changeset
673 ses.last_packet_time_any_sent = now;
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 934
diff changeset
674 /* idle timeout shouldn't be affected by responses to keepalives.
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 934
diff changeset
675 send_msg_keepalive() itself also does tricks with
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 934
diff changeset
676 ses.last_packet_idle_time - read that if modifying this code */
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 934
diff changeset
677 if (packet_type != SSH_MSG_REQUEST_FAILURE
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 934
diff changeset
678 && packet_type != SSH_MSG_UNIMPLEMENTED
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 934
diff changeset
679 && packet_type != SSH_MSG_IGNORE) {
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 934
diff changeset
680 ses.last_packet_time_idle = now;
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 934
diff changeset
681
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 934
diff changeset
682 }
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents: 934
diff changeset
683
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
684 TRACE2(("leave encrypt_packet()"))
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
685 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
686
1577
399d8eb961b5 get rid of unused packet_type in encrypted write queue
Matt Johnston <matt@ucc.asn.au>
parents: 1559
diff changeset
687 void writebuf_enqueue(buffer * writebuf) {
1074
10f198d4a308 Make main socket nonblocking. Limit writequeue size.
Matt Johnston <matt@ucc.asn.au>
parents: 1072
diff changeset
688 /* enqueue the packet for sending. It will get freed after transmission. */
10f198d4a308 Make main socket nonblocking. Limit writequeue size.
Matt Johnston <matt@ucc.asn.au>
parents: 1072
diff changeset
689 buf_setpos(writebuf, 0);
10f198d4a308 Make main socket nonblocking. Limit writequeue size.
Matt Johnston <matt@ucc.asn.au>
parents: 1072
diff changeset
690 enqueue(&ses.writequeue, (void*)writebuf);
1577
399d8eb961b5 get rid of unused packet_type in encrypted write queue
Matt Johnston <matt@ucc.asn.au>
parents: 1559
diff changeset
691 ses.writequeue_len += writebuf->len;
1074
10f198d4a308 Make main socket nonblocking. Limit writequeue size.
Matt Johnston <matt@ucc.asn.au>
parents: 1072
diff changeset
692 }
10f198d4a308 Make main socket nonblocking. Limit writequeue size.
Matt Johnston <matt@ucc.asn.au>
parents: 1072
diff changeset
693
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
694
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
695 /* 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
696 /* 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
697 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
698 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
699 unsigned char *output_mac) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
700 unsigned char seqbuf[4];
228
5e4110bb753a - Fixed twofish algorithm naming so it actually works.
Matt Johnston <matt@ucc.asn.au>
parents: 194
diff changeset
701 unsigned long bufsize;
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
702 hmac_state hmac;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
703
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
704 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
705 /* calculate the mac */
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
706 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
707 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
708 key_state->mackey,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
709 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
710 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
711 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
712
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
713 /* sequence number */
534
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf
Matt Johnston <matt@ucc.asn.au>
parents: 533
diff changeset
714 STORE32H(seqno, seqbuf);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
715 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
716 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
717 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
718
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
719 /* 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
720 buf_setpos(clear_buf, 0);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
721 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
722 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
723 clear_len) != CRYPT_OK) {
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
724 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
725 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
726
1249
c6346c63281b refactor indentation with hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1079
diff changeset
727 bufsize = MAX_MAC_LEN;
533
805ae74ec024 Encrypt in-place, avoid an extra malloc
Matt Johnston <matt@ucc.asn.au>
parents: 532
diff changeset
728 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
729 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
730 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
731 }
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
732 TRACE2(("leave writemac"))
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
733 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
734
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
735 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
736 /* compresses len bytes from src, outputting to dest (starting from the
1057
16584026a1f0 allocate buffer and data in a single allocation
Matt Johnston <matt@ucc.asn.au>
parents: 1055
diff changeset
737 * respective current positions. dest must have sufficient space,
16584026a1f0 allocate buffer and data in a single allocation
Matt Johnston <matt@ucc.asn.au>
parents: 1055
diff changeset
738 * len+ZLIB_COMPRESS_EXPANSION */
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
739 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
740
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
741 unsigned int endpos = src->pos + len;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
742 int result;
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
743
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
744 TRACE2(("enter buf_compress"))
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
745
1057
16584026a1f0 allocate buffer and data in a single allocation
Matt Johnston <matt@ucc.asn.au>
parents: 1055
diff changeset
746 dropbear_assert(dest->size - dest->pos >= len+ZLIB_COMPRESS_EXPANSION);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
747
1057
16584026a1f0 allocate buffer and data in a single allocation
Matt Johnston <matt@ucc.asn.au>
parents: 1055
diff changeset
748 ses.keys->trans.zstream->avail_in = endpos - src->pos;
16584026a1f0 allocate buffer and data in a single allocation
Matt Johnston <matt@ucc.asn.au>
parents: 1055
diff changeset
749 ses.keys->trans.zstream->next_in =
16584026a1f0 allocate buffer and data in a single allocation
Matt Johnston <matt@ucc.asn.au>
parents: 1055
diff changeset
750 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
751
1057
16584026a1f0 allocate buffer and data in a single allocation
Matt Johnston <matt@ucc.asn.au>
parents: 1055
diff changeset
752 ses.keys->trans.zstream->avail_out = dest->size - dest->pos;
16584026a1f0 allocate buffer and data in a single allocation
Matt Johnston <matt@ucc.asn.au>
parents: 1055
diff changeset
753 ses.keys->trans.zstream->next_out =
16584026a1f0 allocate buffer and data in a single allocation
Matt Johnston <matt@ucc.asn.au>
parents: 1055
diff changeset
754 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
755
1057
16584026a1f0 allocate buffer and data in a single allocation
Matt Johnston <matt@ucc.asn.au>
parents: 1055
diff changeset
756 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
757
1057
16584026a1f0 allocate buffer and data in a single allocation
Matt Johnston <matt@ucc.asn.au>
parents: 1055
diff changeset
758 buf_setpos(src, endpos - ses.keys->trans.zstream->avail_in);
16584026a1f0 allocate buffer and data in a single allocation
Matt Johnston <matt@ucc.asn.au>
parents: 1055
diff changeset
759 buf_setlen(dest, dest->size - ses.keys->trans.zstream->avail_out);
16584026a1f0 allocate buffer and data in a single allocation
Matt Johnston <matt@ucc.asn.au>
parents: 1055
diff changeset
760 buf_setpos(dest, dest->len);
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
761
1057
16584026a1f0 allocate buffer and data in a single allocation
Matt Johnston <matt@ucc.asn.au>
parents: 1055
diff changeset
762 if (result != Z_OK) {
16584026a1f0 allocate buffer and data in a single allocation
Matt Johnston <matt@ucc.asn.au>
parents: 1055
diff changeset
763 dropbear_exit("zlib error");
16584026a1f0 allocate buffer and data in a single allocation
Matt Johnston <matt@ucc.asn.au>
parents: 1055
diff changeset
764 }
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
765
1057
16584026a1f0 allocate buffer and data in a single allocation
Matt Johnston <matt@ucc.asn.au>
parents: 1055
diff changeset
766 /* fails if destination buffer wasn't large enough */
16584026a1f0 allocate buffer and data in a single allocation
Matt Johnston <matt@ucc.asn.au>
parents: 1055
diff changeset
767 dropbear_assert(ses.keys->trans.zstream->avail_in == 0);
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 728
diff changeset
768 TRACE2(("leave buf_compress"))
27
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
769 }
08da099e8337 - Rename common-packet.c to packet.c
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
770 #endif