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
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
|
/*
* Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <errno.h>
#include "bio_local.h"
#include "internal/cryptlib.h"
static int mem_write(BIO *h, const char *buf, int num);
static int mem_read(BIO *h, char *buf, int size);
static int mem_puts(BIO *h, const char *str);
static int mem_gets(BIO *h, char *str, int size);
static long mem_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int mem_new(BIO *h);
static int secmem_new(BIO *h);
static int mem_free(BIO *data);
static int mem_buf_free(BIO *data);
static int mem_buf_sync(BIO *h);
static const BIO_METHOD mem_method = {
BIO_TYPE_MEM,
"memory buffer",
/* TODO: Convert to new style write function */
bwrite_conv,
mem_write,
/* TODO: Convert to new style read function */
bread_conv,
mem_read,
mem_puts,
mem_gets,
mem_ctrl,
mem_new,
mem_free,
NULL, /* mem_callback_ctrl */
};
static const BIO_METHOD secmem_method = {
BIO_TYPE_MEM,
"secure memory buffer",
/* TODO: Convert to new style write function */
bwrite_conv,
mem_write,
/* TODO: Convert to new style read function */
bread_conv,
mem_read,
mem_puts,
mem_gets,
mem_ctrl,
secmem_new,
mem_free,
NULL, /* mem_callback_ctrl */
};
/*
* BIO memory stores buffer and read pointer
* however the roles are different for read only BIOs.
* In that case the readp just stores the original state
* to be used for reset.
*/
typedef struct bio_buf_mem_st {
struct buf_mem_st *buf; /* allocated buffer */
struct buf_mem_st *readp; /* read pointer */
} BIO_BUF_MEM;
/*
* bio->num is used to hold the value to return on 'empty', if it is 0,
* should_retry is not set
*/
const BIO_METHOD *BIO_s_mem(void)
{
return &mem_method;
}
const BIO_METHOD *BIO_s_secmem(void)
{
return(&secmem_method);
}
BIO *BIO_new_mem_buf(const void *buf, int len)
{
BIO *ret;
BUF_MEM *b;
BIO_BUF_MEM *bb;
size_t sz;
if (buf == NULL) {
BIOerr(BIO_F_BIO_NEW_MEM_BUF, BIO_R_NULL_PARAMETER);
return NULL;
}
sz = (len < 0) ? strlen(buf) : (size_t)len;
if ((ret = BIO_new(BIO_s_mem())) == NULL)
return NULL;
bb = (BIO_BUF_MEM *)ret->ptr;
b = bb->buf;
/* Cast away const and trust in the MEM_RDONLY flag. */
b->data = (void *)buf;
b->length = sz;
b->max = sz;
*bb->readp = *bb->buf;
ret->flags |= BIO_FLAGS_MEM_RDONLY;
/* Since this is static data retrying won't help */
ret->num = 0;
return ret;
}
static int mem_init(BIO *bi, unsigned long flags)
{
BIO_BUF_MEM *bb = OPENSSL_zalloc(sizeof(*bb));
if (bb == NULL)
return 0;
if ((bb->buf = BUF_MEM_new_ex(flags)) == NULL) {
OPENSSL_free(bb);
return 0;
}
if ((bb->readp = OPENSSL_zalloc(sizeof(*bb->readp))) == NULL) {
BUF_MEM_free(bb->buf);
OPENSSL_free(bb);
return 0;
}
*bb->readp = *bb->buf;
bi->shutdown = 1;
bi->init = 1;
bi->num = -1;
bi->ptr = (char *)bb;
return 1;
}
static int mem_new(BIO *bi)
{
return mem_init(bi, 0L);
}
static int secmem_new(BIO *bi)
{
return mem_init(bi, BUF_MEM_FLAG_SECURE);
}
static int mem_free(BIO *a)
{
BIO_BUF_MEM *bb;
if (a == NULL)
return 0;
bb = (BIO_BUF_MEM *)a->ptr;
if (!mem_buf_free(a))
return 0;
OPENSSL_free(bb->readp);
OPENSSL_free(bb);
return 1;
}
static int mem_buf_free(BIO *a)
{
if (a == NULL)
return 0;
if (a->shutdown && a->init && a->ptr != NULL) {
BIO_BUF_MEM *bb = (BIO_BUF_MEM *)a->ptr;
BUF_MEM *b = bb->buf;
if (a->flags & BIO_FLAGS_MEM_RDONLY)
b->data = NULL;
BUF_MEM_free(b);
}
return 1;
}
/*
* Reallocate memory buffer if read pointer differs
* NOT FOR RDONLY
*/
static int mem_buf_sync(BIO *b)
{
if (b != NULL && b->init != 0 && b->ptr != NULL) {
BIO_BUF_MEM *bbm = (BIO_BUF_MEM *)b->ptr;
if (bbm->readp->data != bbm->buf->data) {
memmove(bbm->buf->data, bbm->readp->data, bbm->readp->length);
bbm->buf->length = bbm->readp->length;
bbm->readp->data = bbm->buf->data;
}
}
return 0;
}
static int mem_read(BIO *b, char *out, int outl)
{
int ret = -1;
BIO_BUF_MEM *bbm = (BIO_BUF_MEM *)b->ptr;
BUF_MEM *bm = bbm->readp;
if (b->flags & BIO_FLAGS_MEM_RDONLY)
bm = bbm->buf;
BIO_clear_retry_flags(b);
ret = (outl >= 0 && (size_t)outl > bm->length) ? (int)bm->length : outl;
if ((out != NULL) && (ret > 0)) {
memcpy(out, bm->data, ret);
bm->length -= ret;
bm->max -= ret;
bm->data += ret;
} else if (bm->length == 0) {
ret = b->num;
if (ret != 0)
BIO_set_retry_read(b);
}
return ret;
}
static int mem_write(BIO *b, const char *in, int inl)
{
int ret = -1;
int blen;
BIO_BUF_MEM *bbm = (BIO_BUF_MEM *)b->ptr;
if (in == NULL) {
BIOerr(BIO_F_MEM_WRITE, BIO_R_NULL_PARAMETER);
goto end;
}
if (b->flags & BIO_FLAGS_MEM_RDONLY) {
BIOerr(BIO_F_MEM_WRITE, BIO_R_WRITE_TO_READ_ONLY_BIO);
goto end;
}
BIO_clear_retry_flags(b);
if (inl == 0)
return 0;
blen = bbm->readp->length;
mem_buf_sync(b);
if (BUF_MEM_grow_clean(bbm->buf, blen + inl) == 0)
goto end;
memcpy(bbm->buf->data + blen, in, inl);
*bbm->readp = *bbm->buf;
ret = inl;
end:
return ret;
}
static long mem_ctrl(BIO *b, int cmd, long num, void *ptr)
{
long ret = 1;
char **pptr;
BIO_BUF_MEM *bbm = (BIO_BUF_MEM *)b->ptr;
BUF_MEM *bm, *bo; /* bio_mem, bio_other */
long off, remain;
if (b->flags & BIO_FLAGS_MEM_RDONLY) {
bm = bbm->buf;
bo = bbm->readp;
} else {
bm = bbm->readp;
bo = bbm->buf;
}
off = bm->data - bo->data;
remain = bm->length;
switch (cmd) {
case BIO_CTRL_RESET:
bm = bbm->buf;
if (bm->data != NULL) {
if (!(b->flags & BIO_FLAGS_MEM_RDONLY)) {
if (!(b->flags & BIO_FLAGS_NONCLEAR_RST)) {
memset(bm->data, 0, bm->max);
bm->length = 0;
}
*bbm->readp = *bbm->buf;
} else {
/* For read only case just reset to the start again */
*bbm->buf = *bbm->readp;
}
}
break;
case BIO_C_FILE_SEEK:
if (num < 0 || num > off + remain)
return -1; /* Can't see outside of the current buffer */
bm->data = bo->data + num;
bm->length = bo->length - num;
bm->max = bo->max - num;
off = num;
/* FALLTHRU */
case BIO_C_FILE_TELL:
ret = off;
break;
case BIO_CTRL_EOF:
ret = (long)(bm->length == 0);
break;
case BIO_C_SET_BUF_MEM_EOF_RETURN:
b->num = (int)num;
break;
case BIO_CTRL_INFO:
ret = (long)bm->length;
if (ptr != NULL) {
pptr = (char **)ptr;
*pptr = (char *)&(bm->data[0]);
}
break;
case BIO_C_SET_BUF_MEM:
mem_buf_free(b);
b->shutdown = (int)num;
bbm->buf = ptr;
*bbm->readp = *bbm->buf;
break;
case BIO_C_GET_BUF_MEM_PTR:
if (ptr != NULL) {
if (!(b->flags & BIO_FLAGS_MEM_RDONLY))
mem_buf_sync(b);
bm = bbm->buf;
pptr = (char **)ptr;
*pptr = (char *)bm;
}
break;
case BIO_CTRL_GET_CLOSE:
ret = (long)b->shutdown;
break;
case BIO_CTRL_SET_CLOSE:
b->shutdown = (int)num;
break;
case BIO_CTRL_WPENDING:
ret = 0L;
break;
case BIO_CTRL_PENDING:
ret = (long)bm->length;
break;
case BIO_CTRL_DUP:
case BIO_CTRL_FLUSH:
ret = 1;
break;
case BIO_CTRL_PUSH:
case BIO_CTRL_POP:
default:
ret = 0;
break;
}
return ret;
}
static int mem_gets(BIO *bp, char *buf, int size)
{
int i, j;
int ret = -1;
char *p;
BIO_BUF_MEM *bbm = (BIO_BUF_MEM *)bp->ptr;
BUF_MEM *bm = bbm->readp;
if (bp->flags & BIO_FLAGS_MEM_RDONLY)
bm = bbm->buf;
BIO_clear_retry_flags(bp);
j = bm->length;
if ((size - 1) < j)
j = size - 1;
if (j <= 0) {
*buf = '\0';
return 0;
}
p = bm->data;
for (i = 0; i < j; i++) {
if (p[i] == '\n') {
i++;
break;
}
}
/*
* i is now the max num of bytes to copy, either j or up to
* and including the first newline
*/
i = mem_read(bp, buf, i);
if (i > 0)
buf[i] = '\0';
ret = i;
return ret;
}
static int mem_puts(BIO *bp, const char *str)
{
int n, ret;
n = strlen(str);
ret = mem_write(bp, str, n);
/* memory semantics is that it will always work */
return ret;
}
|