1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
/***************************************************************************
* fqterm, a terminal emulator for both BBS and *nix. *
* Copyright (C) 2008 fqterm development group. *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. *
***************************************************************************/
#include "fqterm_trace.h"
#include "fqterm_ssh_packet.h"
#include "fqterm_ssh_const.h"
#include "crc32.h"
#include <openssl/bn.h>
namespace FQTerm {
//==============================================================================
//FQTermSSHPacketSender
//==============================================================================
FQTermSSHPacketSender::FQTermSSHPacketSender(int ver)
{
buffer_init(&orig_data);
buffer_init(&data_to_send);
if (ver == 2)
cipher = &ssh_cipher_dummy;
else
cipher = new_3des_ssh1(1);
this->ver = ver;
is_mac_ = false;
mac = NULL;
sequence_no_ = 0;
}
FQTermSSHPacketSender::~FQTermSSHPacketSender()
{
cipher->cleanup(cipher);
if (mac)
mac->cleanup(mac);
buffer_deinit(&data_to_send);
buffer_deinit(&orig_data);
}
void FQTermSSHPacketSender::putString(const char *s, int len)
{
if (len < 0)
len = strlen(s);
putInt(len);
putRawData((const uint8_t *)s, len);
}
void FQTermSSHPacketSender::putBN(BIGNUM *bignum)
{
int bits = BN_num_bits(bignum);
int bin_size = (bits + 7) / 8;
uint8_t buf[bin_size];
int oi;
uint8_t msg[2];
// Get the value of in binary
oi = BN_bn2bin(bignum, buf);
if (oi != bin_size) {
FQ_TRACE("sshbuffer", 0) << "BN_bn2bin() failed: oi = " << oi
<< " != bin_size." << bin_size;
}
// Store the number of bits in the buffer in two bytes, msb first
buffer_append_be16(&orig_data, bits);
// Store the binary data.
putRawData(buf, oi);
}
void FQTermSSHPacketSender::startPacket(uint8_t pkt_type)
{
buffer_clear(&orig_data);
putByte(pkt_type);
}
void FQTermSSHPacketSender::write()
{
makePacket();
emit dataToWrite();
}
void FQTermSSHPacketSender::startEncryption(const u_char *key, const u_char *IV)
{
cipher->init(cipher, key, IV);
}
void FQTermSSHPacketSender::resetEncryption()
{
cipher->started = false;
}
void FQTermSSHPacketSender::startMac(const u_char *key) {
is_mac_ = true;
memcpy(mac->key, key, mac->keySize);
}
void FQTermSSHPacketSender::resetMac() {
is_mac_ = false;
}
//==============================================================================
//FQTermSSHPacketReceiver
//==============================================================================
FQTermSSHPacketReceiver::FQTermSSHPacketReceiver()
{
buffer_init(&recvbuf);
cipher = &ssh_cipher_dummy;
is_mac_ = false;
mac = NULL;
sequence_no_ = 0;
}
FQTermSSHPacketReceiver::~FQTermSSHPacketReceiver()
{
buffer_deinit(&recvbuf);
cipher->cleanup(cipher);
if (mac)
mac->cleanup(mac);
}
void FQTermSSHPacketReceiver::getRawData(char *data, int length)
{
if (buffer_len(&recvbuf) >= length)
buffer_get(&recvbuf, (uint8_t*)data, length);
else
emit packetError("Read too many bytes!");
}
uint8_t FQTermSSHPacketReceiver::getByte()
{
if (buffer_len(&recvbuf) >= 1) {
return buffer_get_u8(&recvbuf);
} else {
emit packetError("Read too many bytes!");
return 0;
}
}
uint32_t FQTermSSHPacketReceiver::getInt()
{
if (buffer_len(&recvbuf) >= 4) {
return buffer_get_u32(&recvbuf);
} else {
emit packetError("Read too many bytes!");
return 0;
}
}
void *FQTermSSHPacketReceiver::getString(int *length)
{
uint32_t l = getInt();
char *data = new char[l+1];
getRawData(data, l);
data[l] = 0;
if (length != NULL)
*length = l;
return data;
}
void FQTermSSHPacketReceiver::getBN(BIGNUM *bignum)
{
int bits, bytes;
u_char buf[2];
u_char *bin;
// Get the number for bits.
if (buffer_len(&recvbuf) >= 2) {
bits = buffer_get_u16(&recvbuf);
} else {
emit packetError("Read too many bytes!");
return;
}
// Compute the number of binary bytes that follow.
bytes = (bits + 7) / 8;
if (bytes > 8 *1024) {
emit packetError("Can't handle BN of size!");
return ;
}
if (buffer_len(&recvbuf) < bytes) {
emit packetError("The input buffer is too small!");
return ;
}
bin = buffer_data(&recvbuf);
BN_bin2bn(bin, bytes, bignum);
buffer_consume(&recvbuf, bytes);
}
void FQTermSSHPacketReceiver::consume(int len)
{
buffer_consume(&recvbuf, len);
}
void FQTermSSHPacketReceiver::startEncryption(const u_char *key, const u_char *IV)
{
cipher->init(cipher, key, IV);
}
void FQTermSSHPacketReceiver::resetEncryption()
{
cipher->started = false;
}
void FQTermSSHPacketReceiver::startMac(const u_char *key) {
is_mac_ = true;
memcpy(mac->key, key, mac->keySize);
}
void FQTermSSHPacketReceiver::resetMac() {
is_mac_ = false;
}
} // namespace FQTerm
#include "fqterm_ssh_packet.moc"
|
