aboutsummaryrefslogtreecommitdiffstats
path: root/crypto/asn1/asn1_lib.c
blob: e63e82a8b476265c0dfdb65c145a31591b2dd6dd (plain) (blame)
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
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
/* crypto/asn1/asn1_lib.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <limits.h>
#include "cryptlib.h"
#include <openssl/asn1.h>
#include <openssl/asn1_mac.h>

static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
                           long max);
static void asn1_put_length(unsigned char **pp, int length);
const char ASN1_version[] = "ASN.1" OPENSSL_VERSION_PTEXT;

static int _asn1_check_infinite_end(const unsigned char **p, long len)
{
    /*
     * If there is 0 or 1 byte left, the length check should pick things up
     */
    if (len <= 0)
        return (1);
    else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) {
        (*p) += 2;
        return (1);
    }
    return (0);
}

int ASN1_check_infinite_end(unsigned char **p, long len)
{
    return _asn1_check_infinite_end((const unsigned char **)p, len);
}

int ASN1_const_check_infinite_end(const unsigned char **p, long len)
{
    return _asn1_check_infinite_end(p, len);
}

int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
                    int *pclass, long omax)
{
    int i, ret;
    long l;
    const unsigned char *p = *pp;
    int tag, xclass, inf;
    long max = omax;

    if (!max)
        goto err;
    ret = (*p & V_ASN1_CONSTRUCTED);
    xclass = (*p & V_ASN1_PRIVATE);
    i = *p & V_ASN1_PRIMITIVE_TAG;
    if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */
        p++;
        if (--max == 0)
            goto err;
        l = 0;
        while (*p & 0x80) {
            l <<= 7L;
            l |= *(p++) & 0x7f;
            if (--max == 0)
                goto err;
            if (l > (INT_MAX >> 7L))
                goto err;
        }
        l <<= 7L;
        l |= *(p++) & 0x7f;
        tag = (int)l;
        if (--max == 0)
            goto err;
    } else {
        tag = i;
        p++;
        if (--max == 0)
            goto err;
    }
    *ptag = tag;
    *pclass = xclass;
    if (!asn1_get_length(&p, &inf, plength, max))
        goto err;

    if (inf && !(ret & V_ASN1_CONSTRUCTED))
        goto err;

#if 0
    fprintf(stderr, "p=%d + *plength=%ld > omax=%ld + *pp=%d  (%d > %d)\n",
            (int)p, *plength, omax, (int)*pp, (int)(p + *plength),
            (int)(omax + *pp));

#endif
    if (*plength > (omax - (p - *pp))) {
        ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_TOO_LONG);
        /*
         * Set this so that even if things are not long enough the values are
         * set correctly
         */
        ret |= 0x80;
    }
    *pp = p;
    return (ret | inf);
 err:
    ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_HEADER_TOO_LONG);
    return (0x80);
}

static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
                           long max)
{
    const unsigned char *p = *pp;
    unsigned long ret = 0;
    unsigned long i;

    if (max-- < 1)
        return 0;
    if (*p == 0x80) {
        *inf = 1;
        ret = 0;
        p++;
    } else {
        *inf = 0;
        i = *p & 0x7f;
        if (*(p++) & 0x80) {
            if (i > sizeof(ret) || max < (long)i)
                return 0;
            while (i-- > 0) {
                ret <<= 8L;
                ret |= *(p++);
            }
        } else
            ret = i;
    }
    if (ret > LONG_MAX)
        return 0;
    *pp = p;
    *rl = (long)ret;
    return 1;
}

/*
 * class 0 is constructed constructed == 2 for indefinite length constructed
 */
void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
                     int xclass)
{
    unsigned char *p = *pp;
    int i, ttag;

    i = (constructed) ? V_ASN1_CONSTRUCTED : 0;
    i |= (xclass & V_ASN1_PRIVATE);
    if (tag < 31)
        *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG);
    else {
        *(p++) = i | V_ASN1_PRIMITIVE_TAG;
        for (i = 0, ttag = tag; ttag > 0; i++)
            ttag >>= 7;
        ttag = i;
        while (i-- > 0) {
            p[i] = tag & 0x7f;
            if (i != (ttag - 1))
                p[i] |= 0x80;
            tag >>= 7;
        }
        p += ttag;
    }
    if (constructed == 2)
        *(p++) = 0x80;
    else
        asn1_put_length(&p, length);
    *pp = p;
}

int ASN1_put_eoc(unsigned char **pp)
{
    unsigned char *p = *pp;
    *p++ = 0;
    *p++ = 0;
    *pp = p;
    return 2;
}

static void asn1_put_length(unsigned char **pp, int length)
{
    unsigned char *p = *pp;
    int i, l;
    if (length <= 127)
        *(p++) = (unsigned char)length;
    else {
        l = length;
        for (i = 0; l > 0; i++)
            l >>= 8;
        *(p++) = i | 0x80;
        l = i;
        while (i-- > 0) {
            p[i] = length & 0xff;
            length >>= 8;
        }
        p += l;
    }
    *pp = p;
}

int ASN1_object_size(int constructed, int length, int tag)
{
    int ret = 1;
    if (length < 0)
        return -1;
    if (tag >= 31) {
        while (tag > 0) {
            tag >>= 7;
            ret++;
        }
    }
    if (constructed == 2) {
        ret += 3;
    } else {
        ret++;
        if (length > 127) {
            int tmplen = length;
            while (tmplen > 0) {
                tmplen >>= 8;
                ret++;
            }
        }
    }
    if (ret >= INT_MAX - length)
        return -1;
    return ret + length;
}

static int _asn1_Finish(ASN1_const_CTX *c)
{
    if ((c->inf == (1 | V_ASN1_CONSTRUCTED)) && (!c->eos)) {
        if (!ASN1_const_check_infinite_end(&c->p, c->slen)) {
            c->error = ERR_R_MISSING_ASN1_EOS;
            return (0);
        }
    }
    if (((c->slen != 0) && !(c->inf & 1)) || ((c->slen < 0) && (c->inf & 1))) {
        c->error = ERR_R_ASN1_LENGTH_MISMATCH;
        return (0);
    }
    return (1);
}

int asn1_Finish(ASN1_CTX *c)
{
    return _asn1_Finish((ASN1_const_CTX *)c);
}

int asn1_const_Finish(ASN1_const_CTX *c)
{
    return _asn1_Finish(c);
}

int asn1_GetSequence(ASN1_const_CTX *c, long *length)
{
    const unsigned char *q;

    q = c->p;
    c->inf = ASN1_get_object(&(c->p), &(c->slen), &(c->tag), &(c->xclass),
                             *length);
    if (c->inf & 0x80) {
        c->error = ERR_R_BAD_GET_ASN1_OBJECT_CALL;
        return (0);
    }
    if (c->tag != V_ASN1_SEQUENCE) {
        c->error = ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
        return (0);
    }
    (*length) -= (c->p - q);
    if (c->max && (*length < 0)) {
        c->error = ERR_R_ASN1_LENGTH_MISMATCH;
        return (0);
    }
    if (c->inf == (1 | V_ASN1_CONSTRUCTED))
        c->slen = *length;
    c->eos = 0;
    return (1);
}

int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
{
    if (str == NULL)
        return 0;
    dst->type = str->type;
    if (!ASN1_STRING_set(dst, str->data, str->length))
        return 0;
    dst->flags = str->flags;
    return 1;
}

ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
{
    ASN1_STRING *ret;
    if (!str)
        return NULL;
    ret = ASN1_STRING_new();
    if (!ret)
        return NULL;
    if (!ASN1_STRING_copy(ret, str)) {
        ASN1_STRING_free(ret);
        return NULL;
    }
    return ret;
}

int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
{
    unsigned char *c;
    const char *data = _data;

    if (len < 0) {
        if (data == NULL)
            return (0);
        else
            len = strlen(data);
    }
    if ((str->length <= len) || (str->data == NULL)) {
        c = str->data;
        if (c == NULL)
            str->data = OPENSSL_malloc(len + 1);
        else
            str->data = OPENSSL_realloc(c, len + 1);

        if (str->data == NULL) {
            ASN1err(ASN1_F_ASN1_STRING_SET, ERR_R_MALLOC_FAILURE);
            str->data = c;
            return (0);
        }
    }
    str->length = len;
    if (data != NULL) {
        memcpy(str->data, data, len);
        /* an allowance for strings :-) */
        str->data[len] = '\0';
    }
    return (1);
}

void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
{
    if (str->data)
        OPENSSL_free(str->data);
    str->data = data;
    str->length = len;
}

ASN1_STRING *ASN1_STRING_new(void)
{
    return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
}

ASN1_STRING *ASN1_STRING_type_new(int type)
{
    ASN1_STRING *ret;

    ret = (ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
    if (ret == NULL) {
        ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW, ERR_R_MALLOC_FAILURE);
        return (NULL);
    }
    ret->length = 0;
    ret->type = type;
    ret->data = NULL;
    ret->flags = 0;
    return (ret);
}

void ASN1_STRING_free(ASN1_STRING *a)
{
    if (a == NULL)
        return;
    if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
        OPENSSL_free(a->data);
    OPENSSL_free(a);
}

void ASN1_STRING_clear_free(ASN1_STRING *a)
{
    if (a && a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
        OPENSSL_cleanse(a->data, a->length);
    ASN1_STRING_free(a);
}

int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
{
    int i;

    i = (a->length - b->length);
    if (i == 0) {
        i = memcmp(a->data, b->data, a->length);
        if (i == 0)
            return (a->type - b->type);
        else
            return (i);
    } else
        return (i);
}

void asn1_add_error(const unsigned char *address, int offset)
{
    char buf1[DECIMAL_SIZE(address) + 1], buf2[DECIMAL_SIZE(offset) + 1];

    BIO_snprintf(buf1, sizeof buf1, "%lu", (unsigned long)address);
    BIO_snprintf(buf2, sizeof buf2, "%d", offset);
    ERR_add_error_data(4, "address=", buf1, " offset=", buf2);
}

int ASN1_STRING_length(const ASN1_STRING *x)
{
    return M_ASN1_STRING_length(x);
}

void ASN1_STRING_length_set(ASN1_STRING *x, int len)
{
    M_ASN1_STRING_length_set(x, len);
    return;
}

int ASN1_STRING_type(ASN1_STRING *x)
{
    return M_ASN1_STRING_type(x);
}

unsigned char *ASN1_STRING_data(ASN1_STRING *x)
{
    return M_ASN1_STRING_data(x);
}