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/[ttssh2]/trunk/ttssh2/ttxssh/pkt.c

Annotation of /trunk/ttssh2/ttxssh/pkt.c

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Mon May 28 07:49:43 2018 UTC (5 years, 9 months ago) by doda
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typo fix
1 maya 3227 /*
2 doda 6841 * Copyright (c) 1998-2001, Robert O'Callahan
3     * (C) 2004-2017 TeraTerm Project
4     * All rights reserved.
5     *
6     * Redistribution and use in source and binary forms, with or without
7     * modification, are permitted provided that the following conditions
8     * are met:
9     *
10     * 1. Redistributions of source code must retain the above copyright
11     * notice, this list of conditions and the following disclaimer.
12     * 2. Redistributions in binary form must reproduce the above copyright
13     * notice, this list of conditions and the following disclaimer in the
14     * documentation and/or other materials provided with the distribution.
15     * 3. The name of the author may not be used to endorse or promote products
16     * derived from this software without specific prior written permission.
17     *
18     * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
19     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21     * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
22     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28     */
29 maya 3227
30     /*
31     This code is copyright (C) 1998-1999 Robert O'Callahan.
32     See LICENSE.TXT for the license.
33     */
34    
35     #include "ttxssh.h"
36     #include "util.h"
37     #include "pkt.h"
38    
39     #define READAMOUNT CHAN_SES_WINDOW_DEFAULT
40    
41     void PKT_init(PTInstVar pvar)
42     {
43     buf_create(&pvar->pkt_state.buf, &pvar->pkt_state.buflen);
44     pvar->pkt_state.datastart = 0;
45     pvar->pkt_state.datalen = 0;
46     pvar->pkt_state.seen_server_ID = FALSE;
47     pvar->pkt_state.seen_newline = FALSE;
48     pvar->pkt_state.predecrypted_packet = FALSE;
49     }
50    
51     /* Read some data, leave no more than up_to_amount bytes in the buffer,
52     return the number of bytes read or -1 on error or blocking. */
53     static int recv_data(PTInstVar pvar, unsigned long up_to_amount)
54     {
55     int amount_read;
56    
57     /* Shuffle data to the start of the buffer */
58     if (pvar->pkt_state.datastart != 0) {
59     memmove(pvar->pkt_state.buf,
60     pvar->pkt_state.buf + pvar->pkt_state.datastart,
61     pvar->pkt_state.datalen);
62     pvar->pkt_state.datastart = 0;
63     }
64    
65 doda 6966 buf_ensure_size(&pvar->pkt_state.buf, &pvar->pkt_state.buflen, up_to_amount);
66 maya 3227
67     _ASSERT(pvar->pkt_state.buf != NULL);
68    
69     amount_read = (pvar->Precv) (pvar->socket,
70 doda 6966 pvar->pkt_state.buf + pvar->pkt_state.datalen,
71 maya 3227 up_to_amount - pvar->pkt_state.datalen,
72     0);
73    
74     if (amount_read > 0) {
75     /* Update seen_newline if necessary */
76 doda 6966 if (!pvar->pkt_state.seen_server_ID && !pvar->pkt_state.seen_newline) {
77 maya 3227 int i;
78    
79     for (i = 0; i < amount_read; i++) {
80 doda 6966 if (pvar->pkt_state.buf[pvar->pkt_state.datalen + i] == '\n') {
81 maya 3227 pvar->pkt_state.seen_newline = 1;
82     }
83     }
84     }
85     pvar->pkt_state.datalen += amount_read;
86     }
87    
88     return amount_read;
89     }
90    
91     // ���s�R�[�h���o��������������
92     static int recv_line_data(PTInstVar pvar)
93     {
94     int amount_read;
95     char buf[256];
96     size_t up_to_amount = sizeof(buf);
97     int i;
98    
99     /* Shuffle data to the start of the buffer */
100     if (pvar->pkt_state.datastart != 0) {
101     memmove(pvar->pkt_state.buf,
102     pvar->pkt_state.buf + pvar->pkt_state.datastart,
103     pvar->pkt_state.datalen);
104     pvar->pkt_state.datastart = 0;
105     }
106    
107 doda 6966 buf_ensure_size(&pvar->pkt_state.buf, &pvar->pkt_state.buflen, up_to_amount);
108 maya 3227
109     for (i = 0 ; i < (int)up_to_amount ; i++) {
110 doda 6966 amount_read = (pvar->Precv) (pvar->socket, &buf[i], 1, 0);
111 maya 3227 if (amount_read != 1) {
112     return 0; // error
113     }
114    
115     pvar->pkt_state.datalen += amount_read;
116    
117     if (buf[i] == '\n') { // 0x0a
118     buf[i+1] = 0;
119     break;
120     }
121     }
122     amount_read = i + 1; // ���������T�C�Y�iLF�������j
123     memcpy(pvar->pkt_state.buf, buf, amount_read);
124    
125     pvar->pkt_state.seen_newline = 1;
126    
127     return amount_read;
128     }
129    
130     /* This function does two things:
131     -- reads data from the sshd and feeds the SSH protocol packets to ssh.c
132     -- copies any available decrypted session data into the application buffer
133     */
134 doda 6801 int PKT_recv(PTInstVar pvar, char *buf, int buflen)
135 maya 3227 {
136     int amount_in_buf = 0;
137     BOOL connection_closed = FALSE;
138    
139     while (SSH_is_any_payload(pvar) ? buflen > 0 : !connection_closed) {
140     if (SSH_is_any_payload(pvar)) {
141     /* ssh.c has some session data for us to give to Tera Term. */
142     int grabbed = SSH_extract_payload(pvar, buf, buflen);
143    
144     amount_in_buf += grabbed;
145     buf += grabbed;
146     buflen -= grabbed;
147 doda 6968 }
148     else if (!pvar->pkt_state.seen_server_ID && (pvar->pkt_state.seen_newline || pvar->pkt_state.datalen >= 255)) {
149     /*
150     * We're looking for the initial ID string and either we've seen the
151     * terminating newline, or we've exceeded the limit at which we should see a newline.
152     */
153 maya 3227 unsigned int i;
154    
155 doda 6966 for (i = 0; pvar->pkt_state.buf[i] != '\n' && i < pvar->pkt_state.datalen; i++) {
156 maya 3227 }
157     if (pvar->pkt_state.buf[i] == '\n') {
158     i++;
159     }
160    
161     // SSH�T�[�o���o�[�W�����`�F�b�N���s��
162     if (SSH_handle_server_ID(pvar, pvar->pkt_state.buf, i)) {
163     pvar->pkt_state.seen_server_ID = 1;
164    
165 doda 6966 if (SSHv2(pvar)) {
166 maya 3227 // send Key Exchange Init
167     SSH2_send_kexinit(pvar);
168     }
169 maya 4549 } else {
170     // reset flag to re-read server ID (2008.1.24 yutaka)
171     pvar->pkt_state.seen_newline = 0;
172 maya 3227 }
173    
174     pvar->pkt_state.datastart += i;
175     pvar->pkt_state.datalen -= i;
176 doda 6968 }
177 doda 6982 else if (pvar->pkt_state.seen_server_ID && pvar->pkt_state.datalen >= SSH_get_min_packet_size(pvar)) {
178 doda 6966 char *data = pvar->pkt_state.buf + pvar->pkt_state.datastart;
179 maya 3227 uint32 padding;
180     uint32 pktsize;
181     uint32 total_packet_size;
182 doda 6969 struct Mac *mac = &pvar->ssh2_keys[MODE_IN].mac;
183 doda 6985 struct Enc *enc = &pvar->ssh2_keys[MODE_IN].enc;
184     int aadlen;
185 maya 3227
186 doda 6985 /*
187     * aadlen: Additional Authenticated Data Length
188     * - �������������� MAC �� AEAD �����F���������������f�[�^������
189     *
190     * EtM ������ MAC ���AAEAD �����������p�P�b�g���������p�P�b�g��������������������
191     * �F���������s�������B�p�P�b�g���� uint32 (4�o�C�g) ���i�[�����������B
192     * ������ MAC ���� (E&M) ���A���� AEAD �������������������p�P�b�g��������������
193     * ���������� aadlen �� 0 �������B
194     */
195     if (SSHv2(pvar) && ((mac && mac->etm) || (enc && enc->auth_len > 0))) {
196     aadlen = 4;
197     }
198     else {
199     aadlen = 0;
200     }
201 doda 6969
202 doda 6972 /*
203 doda 6985 * aadlen �� 0 �������p�P�b�g�������������������������B�p�P�b�g�S�������M��������
204     * ���i���������s�������p�P�b�g�����m���K�v���L�����A������ 1 �u���b�N�����������B
205 doda 6972 */
206 doda 6985 if (SSHv2(pvar) && !pvar->pkt_state.predecrypted_packet && aadlen == 0) {
207 doda 7109 SSH_predecrypt_packet(pvar, data);
208 doda 6771 pvar->pkt_state.predecrypted_packet = TRUE;
209 maya 3227 }
210    
211 doda 6983 // �p�P�b�g�������� uint32 (4�o�C�g) ���p�P�b�g��������
212     pktsize = get_uint32_MSBfirst(data);
213    
214 maya 3227 if (SSHv1(pvar)) {
215 doda 6983 // SSH1 �����p�P�b�g�����l���� padding �����������������������B
216     // ���� padding ���������������p�P�b�g���������������A�p�P�b�g�����l�����v�Z�����B
217     padding = 8 - (pktsize % 8);
218 maya 3227
219 doda 6983 // ���~�������� pktsize �� padding ���l�������������������O���������������B
220     pktsize += padding;
221 maya 3227 }
222    
223 doda 6972 // �p�P�b�g(TCP�y�C���[�h)���S�����T�C�Y���ASSH�y�C���[�h+4�i+MAC�j�������B
224 maya 3227 // +4���ASSH�y�C���[�h���T�C�Y���i�[�������������iint�^�j�B
225 doda 6985 total_packet_size = pktsize + 4 + SSH_get_authdata_size(pvar, MODE_IN);
226 maya 3227
227     if (total_packet_size <= pvar->pkt_state.datalen) {
228 doda 6972 // ���M�����f�[�^���\���L���������p�P�b�g�����������s��
229 doda 6968 if (SSHv1(pvar)) {
230 doda 6983 // SSH1 �� EtM ������ (�������� MAC �������� CRC ���g��)
231 doda 6981 SSH1_handle_packet(pvar, data, pktsize, padding);
232 doda 6968 }
233     else {
234 doda 6983 // SSH2 �����������_���� padding ���������������������������������������A
235     // padding �����n�������A�K�v���������������������������B
236 doda 6985 SSH2_handle_packet(pvar, data, pktsize, aadlen, enc->auth_len);
237 doda 6968 }
238 doda 6972
239 maya 3227 pvar->pkt_state.predecrypted_packet = FALSE;
240     pvar->pkt_state.datastart += total_packet_size;
241     pvar->pkt_state.datalen -= total_packet_size;
242    
243 doda 6983 }
244     else if (total_packet_size > PACKET_MAX_SIZE) {
245 doda 6972 // �p�P�b�g�������������������������I�������B
246     // �����������������v�����������s���p�P�b�g���������������������������B
247 maya 3227 UTIL_get_lang_msg("MSG_PKT_OVERSIZED_ERROR", pvar,
248 maya 4549 "Oversized packet received from server; connection will close.");
249 maya 5678 notify_fatal_error(pvar, pvar->ts->UIMsg, TRUE);
250 doda 6983 }
251     else {
252 doda 6966 int amount_read = recv_data(pvar, max(total_packet_size, READAMOUNT));
253 maya 3227
254     if (amount_read == SOCKET_ERROR) {
255     if (amount_in_buf == 0) {
256     return SOCKET_ERROR;
257     } else {
258     return amount_in_buf;
259     }
260     } else {
261     if (amount_read == 0) {
262     connection_closed = TRUE;
263     }
264     }
265     }
266     } else {
267 doda 6966 // �p�P�b�g�����M
268 maya 3227 int amount_read;
269    
270 doda 6966 amount_read = recv_data(pvar, READAMOUNT);
271 maya 3227
272     if (amount_read == SOCKET_ERROR) {
273     if (amount_in_buf == 0) {
274     return SOCKET_ERROR;
275     } else {
276     return amount_in_buf;
277     }
278     } else if (amount_read == 0) {
279     connection_closed = TRUE;
280     }
281     }
282    
283     if (pvar->fatal_error) {
284     return amount_in_buf;
285     }
286     }
287    
288     if (SSH_is_any_payload(pvar)) {
289 doda 6966 PostMessage(pvar->NotificationWindow, WM_USER_COMMNOTIFY, pvar->socket, MAKELPARAM(FD_READ, 0));
290 maya 3227 }
291    
292     return amount_in_buf;
293     }
294    
295     void PKT_end(PTInstVar pvar)
296     {
297     buf_destroy(&pvar->pkt_state.buf, &pvar->pkt_state.buflen);
298     }
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