Coverage Report

Created: 2024-07-27 06:35

/src/openssl/crypto/asn1/asn1_lib.c
Line
Count
Source (jump to first uncovered line)
1
/*
2
 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
3
 *
4
 * Licensed under the Apache License 2.0 (the "License").  You may not use
5
 * this file except in compliance with the License.  You can obtain a copy
6
 * in the file LICENSE in the source distribution or at
7
 * https://www.openssl.org/source/license.html
8
 */
9
10
#include <stdio.h>
11
#include <limits.h>
12
#include "internal/cryptlib.h"
13
#include <openssl/asn1.h>
14
#include "asn1_local.h"
15
16
static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
17
                           long max);
18
static void asn1_put_length(unsigned char **pp, int length);
19
20
static int _asn1_check_infinite_end(const unsigned char **p, long len)
21
0
{
22
    /*
23
     * If there is 0 or 1 byte left, the length check should pick things up
24
     */
25
0
    if (len <= 0) {
26
0
        return 1;
27
0
    } else {
28
0
        if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) {
29
0
            (*p) += 2;
30
0
            return 1;
31
0
        }
32
0
    }
33
0
    return 0;
34
0
}
35
36
int ASN1_check_infinite_end(unsigned char **p, long len)
37
0
{
38
0
    return _asn1_check_infinite_end((const unsigned char **)p, len);
39
0
}
40
41
int ASN1_const_check_infinite_end(const unsigned char **p, long len)
42
0
{
43
0
    return _asn1_check_infinite_end(p, len);
44
0
}
45
46
int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
47
                    int *pclass, long omax)
48
1.54M
{
49
1.54M
    int i, ret;
50
1.54M
    long len;
51
1.54M
    const unsigned char *p = *pp;
52
1.54M
    int tag, xclass, inf;
53
1.54M
    long max = omax;
54
55
1.54M
    if (omax <= 0) {
56
0
        ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_SMALL);
57
0
        return 0x80;
58
0
    }
59
1.54M
    ret = (*p & V_ASN1_CONSTRUCTED);
60
1.54M
    xclass = (*p & V_ASN1_PRIVATE);
61
1.54M
    i = *p & V_ASN1_PRIMITIVE_TAG;
62
1.54M
    if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */
63
104
        p++;
64
104
        if (--max == 0)
65
2
            goto err;
66
102
        len = 0;
67
490
        while (*p & 0x80) {
68
391
            len <<= 7L;
69
391
            len |= *(p++) & 0x7f;
70
391
            if (--max == 0)
71
2
                goto err;
72
389
            if (len > (INT_MAX >> 7L))
73
1
                goto err;
74
389
        }
75
99
        len <<= 7L;
76
99
        len |= *(p++) & 0x7f;
77
99
        tag = (int)len;
78
99
        if (--max == 0)
79
1
            goto err;
80
1.54M
    } else {
81
1.54M
        tag = i;
82
1.54M
        p++;
83
1.54M
        if (--max == 0)
84
7
            goto err;
85
1.54M
    }
86
1.54M
    *ptag = tag;
87
1.54M
    *pclass = xclass;
88
1.54M
    if (!asn1_get_length(&p, &inf, plength, max))
89
76
        goto err;
90
91
1.54M
    if (inf && !(ret & V_ASN1_CONSTRUCTED))
92
1
        goto err;
93
94
1.54M
    if (*plength > (omax - (p - *pp))) {
95
87.1k
        ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LONG);
96
        /*
97
         * Set this so that even if things are not long enough the values are
98
         * set correctly
99
         */
100
87.1k
        ret |= 0x80;
101
87.1k
    }
102
1.54M
    *pp = p;
103
1.54M
    return ret | inf;
104
90
 err:
105
90
    ERR_raise(ERR_LIB_ASN1, ASN1_R_HEADER_TOO_LONG);
106
90
    return 0x80;
107
1.54M
}
108
109
/*
110
 * Decode a length field.
111
 * The short form is a single byte defining a length 0 - 127.
112
 * The long form is a byte 0 - 127 with the top bit set and this indicates
113
 * the number of following octets that contain the length.  These octets
114
 * are stored most significant digit first.
115
 */
116
static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
117
                           long max)
118
1.54M
{
119
1.54M
    const unsigned char *p = *pp;
120
1.54M
    unsigned long ret = 0;
121
1.54M
    int i;
122
123
1.54M
    if (max-- < 1)
124
0
        return 0;
125
1.54M
    if (*p == 0x80) {
126
153
        *inf = 1;
127
153
        p++;
128
1.54M
    } else {
129
1.54M
        *inf = 0;
130
1.54M
        i = *p & 0x7f;
131
1.54M
        if (*p++ & 0x80) {
132
371k
            if (max < i + 1)
133
16
                return 0;
134
            /* Skip leading zeroes */
135
372k
            while (i > 0 && *p == 0) {
136
1.13k
                p++;
137
1.13k
                i--;
138
1.13k
            }
139
371k
            if (i > (int)sizeof(long))
140
2
                return 0;
141
1.05M
            while (i > 0) {
142
678k
                ret <<= 8;
143
678k
                ret |= *p++;
144
678k
                i--;
145
678k
            }
146
371k
            if (ret > LONG_MAX)
147
58
                return 0;
148
1.17M
        } else {
149
1.17M
            ret = i;
150
1.17M
        }
151
1.54M
    }
152
1.54M
    *pp = p;
153
1.54M
    *rl = (long)ret;
154
1.54M
    return 1;
155
1.54M
}
156
157
/*
158
 * constructed == 2 for indefinite length constructed
159
 */
160
void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
161
                     int xclass)
162
402k
{
163
402k
    unsigned char *p = *pp;
164
402k
    int i, ttag;
165
166
402k
    i = (constructed) ? V_ASN1_CONSTRUCTED : 0;
167
402k
    i |= (xclass & V_ASN1_PRIVATE);
168
402k
    if (tag < 31) {
169
402k
        *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG);
170
402k
    } else {
171
0
        *(p++) = i | V_ASN1_PRIMITIVE_TAG;
172
0
        for (i = 0, ttag = tag; ttag > 0; i++)
173
0
            ttag >>= 7;
174
0
        ttag = i;
175
0
        while (i-- > 0) {
176
0
            p[i] = tag & 0x7f;
177
0
            if (i != (ttag - 1))
178
0
                p[i] |= 0x80;
179
0
            tag >>= 7;
180
0
        }
181
0
        p += ttag;
182
0
    }
183
402k
    if (constructed == 2)
184
0
        *(p++) = 0x80;
185
402k
    else
186
402k
        asn1_put_length(&p, length);
187
402k
    *pp = p;
188
402k
}
189
190
int ASN1_put_eoc(unsigned char **pp)
191
0
{
192
0
    unsigned char *p = *pp;
193
194
0
    *p++ = 0;
195
0
    *p++ = 0;
196
0
    *pp = p;
197
0
    return 2;
198
0
}
199
200
static void asn1_put_length(unsigned char **pp, int length)
201
402k
{
202
402k
    unsigned char *p = *pp;
203
402k
    int i, len;
204
205
402k
    if (length <= 127) {
206
379k
        *(p++) = (unsigned char)length;
207
379k
    } else {
208
23.2k
        len = length;
209
69.6k
        for (i = 0; len > 0; i++)
210
46.4k
            len >>= 8;
211
23.2k
        *(p++) = i | 0x80;
212
23.2k
        len = i;
213
69.6k
        while (i-- > 0) {
214
46.4k
            p[i] = length & 0xff;
215
46.4k
            length >>= 8;
216
46.4k
        }
217
23.2k
        p += len;
218
23.2k
    }
219
402k
    *pp = p;
220
402k
}
221
222
int ASN1_object_size(int constructed, int length, int tag)
223
1.29M
{
224
1.29M
    int ret = 1;
225
226
1.29M
    if (length < 0)
227
0
        return -1;
228
1.29M
    if (tag >= 31) {
229
0
        while (tag > 0) {
230
0
            tag >>= 7;
231
0
            ret++;
232
0
        }
233
0
    }
234
1.29M
    if (constructed == 2) {
235
0
        ret += 3;
236
1.29M
    } else {
237
1.29M
        ret++;
238
1.29M
        if (length > 127) {
239
53.2k
            int tmplen = length;
240
159k
            while (tmplen > 0) {
241
106k
                tmplen >>= 8;
242
106k
                ret++;
243
106k
            }
244
53.2k
        }
245
1.29M
    }
246
1.29M
    if (ret >= INT_MAX - length)
247
0
        return -1;
248
1.29M
    return ret + length;
249
1.29M
}
250
251
void ossl_asn1_string_set_bits_left(ASN1_STRING *str, unsigned int num)
252
68.7k
{
253
68.7k
    str->flags &= ~0x07;
254
68.7k
    str->flags |= ASN1_STRING_FLAG_BITS_LEFT | (num & 0x07);
255
68.7k
}
256
257
int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
258
0
{
259
0
    if (str == NULL)
260
0
        return 0;
261
0
    dst->type = str->type;
262
0
    if (!ASN1_STRING_set(dst, str->data, str->length))
263
0
        return 0;
264
    /* Copy flags but preserve embed value */
265
0
    dst->flags &= ASN1_STRING_FLAG_EMBED;
266
0
    dst->flags |= str->flags & ~ASN1_STRING_FLAG_EMBED;
267
0
    return 1;
268
0
}
269
270
ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
271
0
{
272
0
    ASN1_STRING *ret;
273
274
0
    if (!str)
275
0
        return NULL;
276
0
    ret = ASN1_STRING_new();
277
0
    if (ret == NULL)
278
0
        return NULL;
279
0
    if (!ASN1_STRING_copy(ret, str)) {
280
0
        ASN1_STRING_free(ret);
281
0
        return NULL;
282
0
    }
283
0
    return ret;
284
0
}
285
286
int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len_in)
287
393k
{
288
393k
    unsigned char *c;
289
393k
    const char *data = _data;
290
393k
    size_t len;
291
292
393k
    if (len_in < 0) {
293
0
        if (data == NULL)
294
0
            return 0;
295
0
        len = strlen(data);
296
393k
    } else {
297
393k
        len = (size_t)len_in;
298
393k
    }
299
    /*
300
     * Verify that the length fits within an integer for assignment to
301
     * str->length below.  The additional 1 is subtracted to allow for the
302
     * '\0' terminator even though this isn't strictly necessary.
303
     */
304
393k
    if (len > INT_MAX - 1) {
305
0
        ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LARGE);
306
0
        return 0;
307
0
    }
308
393k
    if ((size_t)str->length <= len || str->data == NULL) {
309
393k
        c = str->data;
310
393k
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
311
        /* No NUL terminator in fuzzing builds */
312
393k
        str->data = OPENSSL_realloc(c, len != 0 ? len : 1);
313
#else
314
        str->data = OPENSSL_realloc(c, len + 1);
315
#endif
316
393k
        if (str->data == NULL) {
317
0
            str->data = c;
318
0
            return 0;
319
0
        }
320
393k
    }
321
393k
    str->length = len;
322
393k
    if (data != NULL) {
323
311k
        memcpy(str->data, data, len);
324
311k
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
325
        /* Set the unused byte to something non NUL and printable. */
326
311k
        if (len == 0)
327
1
            str->data[len] = '~';
328
#else
329
        /*
330
         * Add a NUL terminator. This should not be necessary - but we add it as
331
         * a safety precaution
332
         */
333
        str->data[len] = '\0';
334
#endif
335
311k
    }
336
393k
    return 1;
337
393k
}
338
339
void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
340
151k
{
341
151k
    OPENSSL_free(str->data);
342
151k
    str->data = data;
343
151k
    str->length = len;
344
151k
}
345
346
ASN1_STRING *ASN1_STRING_new(void)
347
0
{
348
0
    return ASN1_STRING_type_new(V_ASN1_OCTET_STRING);
349
0
}
350
351
ASN1_STRING *ASN1_STRING_type_new(int type)
352
403k
{
353
403k
    ASN1_STRING *ret;
354
355
403k
    ret = OPENSSL_zalloc(sizeof(*ret));
356
403k
    if (ret == NULL)
357
0
        return NULL;
358
403k
    ret->type = type;
359
403k
    return ret;
360
403k
}
361
362
void ossl_asn1_string_embed_free(ASN1_STRING *a, int embed)
363
481k
{
364
481k
    if (a == NULL)
365
0
        return;
366
481k
    if (!(a->flags & ASN1_STRING_FLAG_NDEF))
367
481k
        OPENSSL_free(a->data);
368
481k
    if (embed == 0)
369
403k
        OPENSSL_free(a);
370
481k
}
371
372
void ASN1_STRING_free(ASN1_STRING *a)
373
96.2k
{
374
96.2k
    if (a == NULL)
375
50.3k
        return;
376
45.8k
    ossl_asn1_string_embed_free(a, a->flags & ASN1_STRING_FLAG_EMBED);
377
45.8k
}
378
379
void ASN1_STRING_clear_free(ASN1_STRING *a)
380
0
{
381
0
    if (a == NULL)
382
0
        return;
383
0
    if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
384
0
        OPENSSL_cleanse(a->data, a->length);
385
0
    ASN1_STRING_free(a);
386
0
}
387
388
int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
389
4.58k
{
390
4.58k
    int i;
391
392
4.58k
    i = (a->length - b->length);
393
4.58k
    if (i == 0) {
394
4.58k
        if (a->length != 0)
395
4.58k
            i = memcmp(a->data, b->data, a->length);
396
4.58k
        if (i == 0)
397
4.58k
            return a->type - b->type;
398
0
        else
399
0
            return i;
400
4.58k
    } else {
401
0
        return i;
402
0
    }
403
4.58k
}
404
405
int ASN1_STRING_length(const ASN1_STRING *x)
406
64.1k
{
407
64.1k
    return x->length;
408
64.1k
}
409
410
#ifndef OPENSSL_NO_DEPRECATED_3_0
411
void ASN1_STRING_length_set(ASN1_STRING *x, int len)
412
0
{
413
0
    x->length = len;
414
0
}
415
#endif
416
417
int ASN1_STRING_type(const ASN1_STRING *x)
418
0
{
419
0
    return x->type;
420
0
}
421
422
const unsigned char *ASN1_STRING_get0_data(const ASN1_STRING *x)
423
64.1k
{
424
64.1k
    return x->data;
425
64.1k
}
426
427
#ifndef OPENSSL_NO_DEPRECATED_1_1_0
428
unsigned char *ASN1_STRING_data(ASN1_STRING *x)
429
0
{
430
0
    return x->data;
431
0
}
432
#endif
433
434
/* |max_len| excludes NUL terminator and may be 0 to indicate no restriction */
435
char *ossl_sk_ASN1_UTF8STRING2text(STACK_OF(ASN1_UTF8STRING) *text,
436
                                   const char *sep, size_t max_len)
437
0
{
438
0
    int i;
439
0
    ASN1_UTF8STRING *current;
440
0
    size_t length = 0, sep_len;
441
0
    char *result = NULL;
442
0
    char *p;
443
444
0
    if (sep == NULL)
445
0
        sep = "";
446
0
    sep_len = strlen(sep);
447
448
0
    for (i = 0; i < sk_ASN1_UTF8STRING_num(text); i++) {
449
0
        current = sk_ASN1_UTF8STRING_value(text, i);
450
0
        if (i > 0)
451
0
            length += sep_len;
452
0
        length += ASN1_STRING_length(current);
453
0
        if (max_len != 0 && length > max_len)
454
0
            return NULL;
455
0
    }
456
0
    if ((result = OPENSSL_malloc(length + 1)) == NULL)
457
0
        return NULL;
458
459
0
    p = result;
460
0
    for (i = 0; i < sk_ASN1_UTF8STRING_num(text); i++) {
461
0
        current = sk_ASN1_UTF8STRING_value(text, i);
462
0
        length = ASN1_STRING_length(current);
463
0
        if (i > 0 && sep_len > 0) {
464
0
            strncpy(p, sep, sep_len + 1); /* using + 1 to silence gcc warning */
465
0
            p += sep_len;
466
0
        }
467
0
        strncpy(p, (const char *)ASN1_STRING_get0_data(current), length);
468
0
        p += length;
469
0
    }
470
0
    *p = '\0';
471
472
0
    return result;
473
0
}