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
|
/*
* Gather (Read) entire SSL3 records from socket into buffer.
*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is the Netscape security libraries.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1994-2000 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU General Public License Version 2 or later (the
* "GPL"), in which case the provisions of the GPL are applicable
* instead of those above. If you wish to allow use of your
* version of this file only under the terms of the GPL and not to
* allow others to use your version of this file under the MPL,
* indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by
* the GPL. If you do not delete the provisions above, a recipient
* may use your version of this file under either the MPL or the
* GPL.
*
* $Id$
*/
#include "cert.h"
#include "ssl.h"
#include "sslimpl.h"
#include "ssl3prot.h"
/*
* Attempt to read in an entire SSL3 record.
* Blocks here for blocking sockets, otherwise returns -1 with
* PR_WOULD_BLOCK_ERROR when socket would block.
*
* returns 1 if received a complete SSL3 record.
* returns 0 if recv returns EOF
* returns -1 if recv returns <0
* (The error value may have already been set to PR_WOULD_BLOCK_ERROR)
*
* Caller must hold the recv buf lock.
*
* The Gather state machine has 3 states: GS_INIT, GS_HEADER, GS_DATA.
* GS_HEADER: waiting for the 5-byte SSL3 record header to come in.
* GS_DATA: waiting for the body of the SSL3 record to come in.
*
* This loop returns when either (a) an error or EOF occurs,
* (b) PR_WOULD_BLOCK_ERROR,
* (c) data (entire SSL3 record) has been received.
*/
static int
ssl3_GatherData(sslSocket *ss, sslGather *gs, int flags)
{
unsigned char *bp;
unsigned char *lbp;
int nb;
int err;
int rv = 1;
PORT_Assert( ssl_HaveRecvBufLock(ss) );
if (gs->state == GS_INIT) {
gs->state = GS_HEADER;
gs->remainder = 5;
gs->offset = 0;
gs->writeOffset = 0;
gs->readOffset = 0;
}
lbp = gs->inbuf.buf;
for(;;) {
SSL_TRC(30, ("%d: SSL3[%d]: gather state %d (need %d more)",
SSL_GETPID(), ss->fd, gs->state, gs->remainder));
bp = ((gs->state != GS_HEADER) ? lbp : gs->hdr) + gs->offset;
nb = ssl_DefRecv(ss, bp, gs->remainder, flags);
if (nb > 0) {
PRINT_BUF(60, (ss, "raw gather data:", bp, nb));
} else if (nb == 0) {
/* EOF */
SSL_TRC(30, ("%d: SSL3[%d]: EOF", SSL_GETPID(), ss->fd));
rv = 0;
break;
} else /* if (nb < 0) */ {
SSL_DBG(("%d: SSL3[%d]: recv error %d", SSL_GETPID(), ss->fd,
PR_GetError()));
rv = SECFailure;
break;
}
gs->offset += nb;
gs->inbuf.len += nb;
gs->remainder -= nb;
/* if there's more to go, read some more. */
if (gs->remainder > 0) {
continue;
}
/* have received entire record header, or entire record. */
switch (gs->state) {
case GS_HEADER:
/*
** Have received SSL3 record header in gs->hdr.
** Now extract the length of the following encrypted data,
** and then read in the rest of the SSL3 record into gs->inbuf.
*/
gs->remainder = (gs->hdr[3] << 8) | gs->hdr[4];
/* This is the max fragment length for an encrypted fragment
** plus the size of the record header.
*/
if(gs->remainder > (MAX_FRAGMENT_LENGTH + 2048 + 5)) {
SSL3_SendAlert(ss, alert_fatal, unexpected_message);
gs->state = GS_INIT;
PORT_SetError(SSL_ERROR_RX_RECORD_TOO_LONG);
return SECFailure;
}
gs->state = GS_DATA;
gs->offset = 0;
gs->inbuf.len = 0;
if (gs->remainder > gs->inbuf.space) {
err = sslBuffer_Grow(&gs->inbuf, gs->remainder);
if (err) { /* realloc has set error code to no mem. */
return err;
}
lbp = gs->inbuf.buf;
}
break; /* End this case. Continue around the loop. */
case GS_DATA:
/*
** SSL3 record has been completely received.
*/
gs->state = GS_INIT;
return 1;
}
}
return rv;
}
/* Gather in a record and when complete, Handle that record.
* Repeat this until the handshake is complete,
* or until application data is available.
*
* Returns 1 when the handshake is completed without error, or
* application data is available.
* Returns 0 if ssl3_GatherData hits EOF.
* Returns -1 on read error, or PR_WOULD_BLOCK_ERROR, or handleRecord error.
* Returns -2 on SECWouldBlock return from ssl3_HandleRecord.
*
* Called from ssl_GatherRecord1stHandshake in sslcon.c,
* and from SSL_ForceHandshake in sslsecur.c
* and from ssl3_GatherAppDataRecord below (<- DoRecv in sslsecur.c).
*
* Caller must hold the recv buf lock.
*/
int
ssl3_GatherCompleteHandshake(sslSocket *ss, int flags)
{
sslGather * gs = ss->gather;
SSL3Ciphertext cText;
int rv;
PORT_Assert( ssl_HaveRecvBufLock(ss) );
do {
/* bring in the next sslv3 record. */
rv = ssl3_GatherData(ss, gs, flags);
if (rv <= 0) {
return rv;
}
/* decipher it, and handle it if it's a handshake.
* If it's application data, gs->buf will not be empty upon return.
*/
cText.type = (SSL3ContentType)gs->hdr[0];
cText.version = (gs->hdr[1] << 8) | gs->hdr[2];
cText.buf = &gs->inbuf;
rv = ssl3_HandleRecord(ss, &cText, &gs->buf);
if (rv < 0) {
return ss->recvdCloseNotify ? 0 : rv;
}
} while (ss->ssl3->hs.ws != idle_handshake && gs->buf.len == 0);
gs->readOffset = 0;
gs->writeOffset = gs->buf.len;
return 1;
}
/* Repeatedly gather in a record and when complete, Handle that record.
* Repeat this until some application data is received.
*
* Returns 1 when application data is available.
* Returns 0 if ssl3_GatherData hits EOF.
* Returns -1 on read error, or PR_WOULD_BLOCK_ERROR, or handleRecord error.
* Returns -2 on SECWouldBlock return from ssl3_HandleRecord.
*
* Called from DoRecv in sslsecur.c
* Caller must hold the recv buf lock.
*/
int
ssl3_GatherAppDataRecord(sslSocket *ss, int flags)
{
sslGather * gs = ss->gather;
int rv;
PORT_Assert( ssl_HaveRecvBufLock(ss) );
do {
rv = ssl3_GatherCompleteHandshake(ss, flags);
} while (rv > 0 && gs->buf.len == 0);
return rv;
}
|
