Coverage Report

Created: 2024-11-21 07:03

/src/openssl/crypto/asn1/tasn_dec.c
Line
Count
Source (jump to first uncovered line)
1
/*
2
 * Copyright 2000-2024 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 <stddef.h>
11
#include <string.h>
12
#include <openssl/asn1.h>
13
#include <openssl/asn1t.h>
14
#include <openssl/objects.h>
15
#include <openssl/buffer.h>
16
#include <openssl/err.h>
17
#include "internal/numbers.h"
18
#include "asn1_local.h"
19
20
/*
21
 * Constructed types with a recursive definition (such as can be found in PKCS7)
22
 * could eventually exceed the stack given malicious input with excessive
23
 * recursion. Therefore we limit the stack depth. This is the maximum number of
24
 * recursive invocations of asn1_item_embed_d2i().
25
 */
26
0
#define ASN1_MAX_CONSTRUCTED_NEST 30
27
28
static int asn1_item_embed_d2i(ASN1_VALUE **pval, const unsigned char **in,
29
                               long len, const ASN1_ITEM *it,
30
                               int tag, int aclass, char opt, ASN1_TLC *ctx,
31
                               int depth, OSSL_LIB_CTX *libctx,
32
                               const char *propq);
33
34
static int asn1_check_eoc(const unsigned char **in, long len);
35
static int asn1_find_end(const unsigned char **in, long len, char inf);
36
37
static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
38
                        char inf, int tag, int aclass, int depth);
39
40
static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen);
41
42
static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
43
                           char *inf, char *cst,
44
                           const unsigned char **in, long len,
45
                           int exptag, int expclass, char opt, ASN1_TLC *ctx);
46
47
static int asn1_template_ex_d2i(ASN1_VALUE **pval,
48
                                const unsigned char **in, long len,
49
                                const ASN1_TEMPLATE *tt, char opt,
50
                                ASN1_TLC *ctx, int depth, OSSL_LIB_CTX *libctx,
51
                                const char *propq);
52
static int asn1_template_noexp_d2i(ASN1_VALUE **val,
53
                                   const unsigned char **in, long len,
54
                                   const ASN1_TEMPLATE *tt, char opt,
55
                                   ASN1_TLC *ctx, int depth,
56
                                   OSSL_LIB_CTX *libctx, const char *propq);
57
static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
58
                                 const unsigned char **in, long len,
59
                                 const ASN1_ITEM *it,
60
                                 int tag, int aclass, char opt,
61
                                 ASN1_TLC *ctx);
62
static int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
63
                       int utype, char *free_cont, const ASN1_ITEM *it);
64
65
/* Table to convert tags to bit values, used for MSTRING type */
66
static const unsigned long tag2bit[32] = {
67
    /* tags  0 -  3 */
68
    0, 0, 0, B_ASN1_BIT_STRING,
69
    /* tags  4- 7 */
70
    B_ASN1_OCTET_STRING, 0, 0, B_ASN1_UNKNOWN,
71
    /* tags  8-11 */
72
    B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, 0, B_ASN1_UNKNOWN,
73
    /* tags 12-15 */
74
    B_ASN1_UTF8STRING, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,
75
    /* tags 16-19 */
76
    B_ASN1_SEQUENCE, 0, B_ASN1_NUMERICSTRING, B_ASN1_PRINTABLESTRING,
77
    /* tags 20-22 */
78
    B_ASN1_T61STRING, B_ASN1_VIDEOTEXSTRING, B_ASN1_IA5STRING,
79
    /* tags 23-24 */
80
    B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME,
81
    /* tags 25-27 */
82
    B_ASN1_GRAPHICSTRING, B_ASN1_ISO64STRING, B_ASN1_GENERALSTRING,
83
    /* tags 28-31 */
84
    B_ASN1_UNIVERSALSTRING, B_ASN1_UNKNOWN, B_ASN1_BMPSTRING, B_ASN1_UNKNOWN,
85
};
86
87
unsigned long ASN1_tag2bit(int tag)
88
0
{
89
0
    if ((tag < 0) || (tag > 30))
90
0
        return 0;
91
0
    return tag2bit[tag];
92
0
}
93
94
/* Macro to initialize and invalidate the cache */
95
96
0
#define asn1_tlc_clear(c)       do { if ((c) != NULL) (c)->valid = 0; } while (0)
97
/* Version to avoid compiler warning about 'c' always non-NULL */
98
0
#define asn1_tlc_clear_nc(c)    do {(c)->valid = 0; } while (0)
99
100
/*
101
 * Decode an ASN1 item, this currently behaves just like a standard 'd2i'
102
 * function. 'in' points to a buffer to read the data from, in future we
103
 * will have more advanced versions that can input data a piece at a time and
104
 * this will simply be a special case.
105
 */
106
107
static int asn1_item_ex_d2i_intern(ASN1_VALUE **pval, const unsigned char **in,
108
                                   long len, const ASN1_ITEM *it, int tag,
109
                                   int aclass, char opt, ASN1_TLC *ctx,
110
                                   OSSL_LIB_CTX *libctx, const char *propq)
111
0
{
112
0
    int rv;
113
114
0
    if (pval == NULL || it == NULL) {
115
0
        ERR_raise(ERR_LIB_ASN1, ERR_R_PASSED_NULL_PARAMETER);
116
0
        return 0;
117
0
    }
118
0
    rv = asn1_item_embed_d2i(pval, in, len, it, tag, aclass, opt, ctx, 0,
119
0
                             libctx, propq);
120
0
    if (rv <= 0)
121
0
        ASN1_item_ex_free(pval, it);
122
0
    return rv;
123
0
}
124
125
int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len,
126
                     const ASN1_ITEM *it,
127
                     int tag, int aclass, char opt, ASN1_TLC *ctx)
128
0
{
129
0
    return asn1_item_ex_d2i_intern(pval, in, len, it, tag, aclass, opt, ctx,
130
0
                                   NULL, NULL);
131
0
}
132
133
ASN1_VALUE *ASN1_item_d2i_ex(ASN1_VALUE **pval,
134
                             const unsigned char **in, long len,
135
                             const ASN1_ITEM *it, OSSL_LIB_CTX *libctx,
136
                             const char *propq)
137
0
{
138
0
    ASN1_TLC c;
139
0
    ASN1_VALUE *ptmpval = NULL;
140
141
0
    if (pval == NULL)
142
0
        pval = &ptmpval;
143
0
    asn1_tlc_clear_nc(&c);
144
0
    if (asn1_item_ex_d2i_intern(pval, in, len, it, -1, 0, 0, &c, libctx,
145
0
                                propq) > 0)
146
0
        return *pval;
147
0
    return NULL;
148
0
}
149
150
ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval,
151
                          const unsigned char **in, long len,
152
                          const ASN1_ITEM *it)
153
0
{
154
0
    return ASN1_item_d2i_ex(pval, in, len, it, NULL, NULL);
155
0
}
156
157
/*
158
 * Decode an item, taking care of IMPLICIT tagging, if any. If 'opt' set and
159
 * tag mismatch return -1 to handle OPTIONAL
160
 */
161
162
static int asn1_item_embed_d2i(ASN1_VALUE **pval, const unsigned char **in,
163
                               long len, const ASN1_ITEM *it,
164
                               int tag, int aclass, char opt, ASN1_TLC *ctx,
165
                               int depth, OSSL_LIB_CTX *libctx,
166
                               const char *propq)
167
0
{
168
0
    const ASN1_TEMPLATE *tt, *errtt = NULL;
169
0
    const ASN1_EXTERN_FUNCS *ef;
170
0
    const ASN1_AUX *aux;
171
0
    ASN1_aux_cb *asn1_cb;
172
0
    const unsigned char *p = NULL, *q;
173
0
    unsigned char oclass;
174
0
    char seq_eoc, seq_nolen, cst, isopt;
175
0
    long tmplen;
176
0
    int i;
177
0
    int otag;
178
0
    int ret = 0;
179
0
    ASN1_VALUE **pchptr;
180
181
0
    if (pval == NULL || it == NULL) {
182
0
        ERR_raise(ERR_LIB_ASN1, ERR_R_PASSED_NULL_PARAMETER);
183
0
        return 0;
184
0
    }
185
0
    if (len <= 0) {
186
0
        ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_SMALL);
187
0
        return 0;
188
0
    }
189
0
    aux = it->funcs;
190
0
    if (aux && aux->asn1_cb)
191
0
        asn1_cb = aux->asn1_cb;
192
0
    else
193
0
        asn1_cb = 0;
194
195
0
    if (++depth > ASN1_MAX_CONSTRUCTED_NEST) {
196
0
        ERR_raise(ERR_LIB_ASN1, ASN1_R_NESTED_TOO_DEEP);
197
0
        goto err;
198
0
    }
199
200
0
    switch (it->itype) {
201
0
    case ASN1_ITYPE_PRIMITIVE:
202
0
        if (it->templates) {
203
            /*
204
             * tagging or OPTIONAL is currently illegal on an item template
205
             * because the flags can't get passed down. In practice this
206
             * isn't a problem: we include the relevant flags from the item
207
             * template in the template itself.
208
             */
209
0
            if ((tag != -1) || opt) {
210
0
                ERR_raise(ERR_LIB_ASN1,
211
0
                          ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);
212
0
                goto err;
213
0
            }
214
0
            return asn1_template_ex_d2i(pval, in, len, it->templates, opt, ctx,
215
0
                                        depth, libctx, propq);
216
0
        }
217
0
        return asn1_d2i_ex_primitive(pval, in, len, it,
218
0
                                     tag, aclass, opt, ctx);
219
220
0
    case ASN1_ITYPE_MSTRING:
221
        /*
222
         * It never makes sense for multi-strings to have implicit tagging, so
223
         * if tag != -1, then this looks like an error in the template.
224
         */
225
0
        if (tag != -1) {
226
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_BAD_TEMPLATE);
227
0
            goto err;
228
0
        }
229
230
0
        p = *in;
231
        /* Just read in tag and class */
232
0
        ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL,
233
0
                              &p, len, -1, 0, 1, ctx);
234
0
        if (!ret) {
235
0
            ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
236
0
            goto err;
237
0
        }
238
239
        /* Must be UNIVERSAL class */
240
0
        if (oclass != V_ASN1_UNIVERSAL) {
241
            /* If OPTIONAL, assume this is OK */
242
0
            if (opt)
243
0
                return -1;
244
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_MSTRING_NOT_UNIVERSAL);
245
0
            goto err;
246
0
        }
247
248
        /* Check tag matches bit map */
249
0
        if (!(ASN1_tag2bit(otag) & it->utype)) {
250
            /* If OPTIONAL, assume this is OK */
251
0
            if (opt)
252
0
                return -1;
253
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_MSTRING_WRONG_TAG);
254
0
            goto err;
255
0
        }
256
0
        return asn1_d2i_ex_primitive(pval, in, len, it, otag, 0, 0, ctx);
257
258
0
    case ASN1_ITYPE_EXTERN:
259
        /* Use new style d2i */
260
0
        ef = it->funcs;
261
0
        if (ef->asn1_ex_d2i_ex != NULL)
262
0
            return ef->asn1_ex_d2i_ex(pval, in, len, it, tag, aclass, opt, ctx,
263
0
                                      libctx, propq);
264
0
        return ef->asn1_ex_d2i(pval, in, len, it, tag, aclass, opt, ctx);
265
266
0
    case ASN1_ITYPE_CHOICE:
267
        /*
268
         * It never makes sense for CHOICE types to have implicit tagging, so
269
         * if tag != -1, then this looks like an error in the template.
270
         */
271
0
        if (tag != -1) {
272
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_BAD_TEMPLATE);
273
0
            goto err;
274
0
        }
275
276
0
        if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
277
0
            goto auxerr;
278
0
        if (*pval) {
279
            /* Free up and zero CHOICE value if initialised */
280
0
            i = ossl_asn1_get_choice_selector(pval, it);
281
0
            if ((i >= 0) && (i < it->tcount)) {
282
0
                tt = it->templates + i;
283
0
                pchptr = ossl_asn1_get_field_ptr(pval, tt);
284
0
                ossl_asn1_template_free(pchptr, tt);
285
0
                ossl_asn1_set_choice_selector(pval, -1, it);
286
0
            }
287
0
        } else if (!ossl_asn1_item_ex_new_intern(pval, it, libctx, propq)) {
288
0
            ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
289
0
            goto err;
290
0
        }
291
        /* CHOICE type, try each possibility in turn */
292
0
        p = *in;
293
0
        for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
294
0
            pchptr = ossl_asn1_get_field_ptr(pval, tt);
295
            /*
296
             * We mark field as OPTIONAL so its absence can be recognised.
297
             */
298
0
            ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx, depth,
299
0
                                       libctx, propq);
300
            /* If field not present, try the next one */
301
0
            if (ret == -1)
302
0
                continue;
303
            /* If positive return, read OK, break loop */
304
0
            if (ret > 0)
305
0
                break;
306
            /*
307
             * Must be an ASN1 parsing error.
308
             * Free up any partial choice value
309
             */
310
0
            ossl_asn1_template_free(pchptr, tt);
311
0
            errtt = tt;
312
0
            ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
313
0
            goto err;
314
0
        }
315
316
        /* Did we fall off the end without reading anything? */
317
0
        if (i == it->tcount) {
318
            /* If OPTIONAL, this is OK */
319
0
            if (opt) {
320
                /* Free and zero it */
321
0
                ASN1_item_ex_free(pval, it);
322
0
                return -1;
323
0
            }
324
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_NO_MATCHING_CHOICE_TYPE);
325
0
            goto err;
326
0
        }
327
328
0
        ossl_asn1_set_choice_selector(pval, i, it);
329
330
0
        if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
331
0
            goto auxerr;
332
0
        *in = p;
333
0
        return 1;
334
335
0
    case ASN1_ITYPE_NDEF_SEQUENCE:
336
0
    case ASN1_ITYPE_SEQUENCE:
337
0
        p = *in;
338
0
        tmplen = len;
339
340
        /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
341
0
        if (tag == -1) {
342
0
            tag = V_ASN1_SEQUENCE;
343
0
            aclass = V_ASN1_UNIVERSAL;
344
0
        }
345
        /* Get SEQUENCE length and update len, p */
346
0
        ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst,
347
0
                              &p, len, tag, aclass, opt, ctx);
348
0
        if (!ret) {
349
0
            ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
350
0
            goto err;
351
0
        } else if (ret == -1)
352
0
            return -1;
353
0
        if (aux && (aux->flags & ASN1_AFLG_BROKEN)) {
354
0
            len = tmplen - (p - *in);
355
0
            seq_nolen = 1;
356
0
        }
357
        /* If indefinite we don't do a length check */
358
0
        else
359
0
            seq_nolen = seq_eoc;
360
0
        if (!cst) {
361
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
362
0
            goto err;
363
0
        }
364
365
0
        if (*pval == NULL
366
0
                && !ossl_asn1_item_ex_new_intern(pval, it, libctx, propq)) {
367
0
            ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
368
0
            goto err;
369
0
        }
370
371
0
        if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
372
0
            goto auxerr;
373
374
        /* Free up and zero any ADB found */
375
0
        for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
376
0
            if (tt->flags & ASN1_TFLG_ADB_MASK) {
377
0
                const ASN1_TEMPLATE *seqtt;
378
0
                ASN1_VALUE **pseqval;
379
0
                seqtt = ossl_asn1_do_adb(*pval, tt, 0);
380
0
                if (seqtt == NULL)
381
0
                    continue;
382
0
                pseqval = ossl_asn1_get_field_ptr(pval, seqtt);
383
0
                ossl_asn1_template_free(pseqval, seqtt);
384
0
            }
385
0
        }
386
387
        /* Get each field entry */
388
0
        for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
389
0
            const ASN1_TEMPLATE *seqtt;
390
0
            ASN1_VALUE **pseqval;
391
0
            seqtt = ossl_asn1_do_adb(*pval, tt, 1);
392
0
            if (seqtt == NULL)
393
0
                goto err;
394
0
            pseqval = ossl_asn1_get_field_ptr(pval, seqtt);
395
            /* Have we ran out of data? */
396
0
            if (!len)
397
0
                break;
398
0
            q = p;
399
0
            if (asn1_check_eoc(&p, len)) {
400
0
                if (!seq_eoc) {
401
0
                    ERR_raise(ERR_LIB_ASN1, ASN1_R_UNEXPECTED_EOC);
402
0
                    goto err;
403
0
                }
404
0
                len -= p - q;
405
0
                seq_eoc = 0;
406
0
                break;
407
0
            }
408
            /*
409
             * This determines the OPTIONAL flag value. The field cannot be
410
             * omitted if it is the last of a SEQUENCE and there is still
411
             * data to be read. This isn't strictly necessary but it
412
             * increases efficiency in some cases.
413
             */
414
0
            if (i == (it->tcount - 1))
415
0
                isopt = 0;
416
0
            else
417
0
                isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
418
            /*
419
             * attempt to read in field, allowing each to be OPTIONAL
420
             */
421
422
0
            ret = asn1_template_ex_d2i(pseqval, &p, len, seqtt, isopt, ctx,
423
0
                                       depth, libctx, propq);
424
0
            if (!ret) {
425
0
                errtt = seqtt;
426
0
                goto err;
427
0
            } else if (ret == -1) {
428
                /*
429
                 * OPTIONAL component absent. Free and zero the field.
430
                 */
431
0
                ossl_asn1_template_free(pseqval, seqtt);
432
0
                continue;
433
0
            }
434
            /* Update length */
435
0
            len -= p - q;
436
0
        }
437
438
        /* Check for EOC if expecting one */
439
0
        if (seq_eoc && !asn1_check_eoc(&p, len)) {
440
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_MISSING_EOC);
441
0
            goto err;
442
0
        }
443
        /* Check all data read */
444
0
        if (!seq_nolen && len) {
445
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_SEQUENCE_LENGTH_MISMATCH);
446
0
            goto err;
447
0
        }
448
449
        /*
450
         * If we get here we've got no more data in the SEQUENCE, however we
451
         * may not have read all fields so check all remaining are OPTIONAL
452
         * and clear any that are.
453
         */
454
0
        for (; i < it->tcount; tt++, i++) {
455
0
            const ASN1_TEMPLATE *seqtt;
456
0
            seqtt = ossl_asn1_do_adb(*pval, tt, 1);
457
0
            if (seqtt == NULL)
458
0
                goto err;
459
0
            if (seqtt->flags & ASN1_TFLG_OPTIONAL) {
460
0
                ASN1_VALUE **pseqval;
461
0
                pseqval = ossl_asn1_get_field_ptr(pval, seqtt);
462
0
                ossl_asn1_template_free(pseqval, seqtt);
463
0
            } else {
464
0
                errtt = seqtt;
465
0
                ERR_raise(ERR_LIB_ASN1, ASN1_R_FIELD_MISSING);
466
0
                goto err;
467
0
            }
468
0
        }
469
        /* Save encoding */
470
0
        if (!ossl_asn1_enc_save(pval, *in, p - *in, it))
471
0
            goto auxerr;
472
0
        if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
473
0
            goto auxerr;
474
0
        *in = p;
475
0
        return 1;
476
477
0
    default:
478
0
        return 0;
479
0
    }
480
0
 auxerr:
481
0
    ERR_raise(ERR_LIB_ASN1, ASN1_R_AUX_ERROR);
482
0
 err:
483
0
    if (errtt)
484
0
        ERR_add_error_data(4, "Field=", errtt->field_name,
485
0
                           ", Type=", it->sname);
486
0
    else
487
0
        ERR_add_error_data(2, "Type=", it->sname);
488
0
    return 0;
489
0
}
490
491
/*
492
 * Templates are handled with two separate functions. One handles any
493
 * EXPLICIT tag and the other handles the rest.
494
 */
495
496
static int asn1_template_ex_d2i(ASN1_VALUE **val,
497
                                const unsigned char **in, long inlen,
498
                                const ASN1_TEMPLATE *tt, char opt,
499
                                ASN1_TLC *ctx, int depth,
500
                                OSSL_LIB_CTX *libctx, const char *propq)
501
0
{
502
0
    int flags, aclass;
503
0
    int ret;
504
0
    long len;
505
0
    const unsigned char *p, *q;
506
0
    char exp_eoc;
507
0
    if (!val)
508
0
        return 0;
509
0
    flags = tt->flags;
510
0
    aclass = flags & ASN1_TFLG_TAG_CLASS;
511
512
0
    p = *in;
513
514
    /* Check if EXPLICIT tag expected */
515
0
    if (flags & ASN1_TFLG_EXPTAG) {
516
0
        char cst;
517
        /*
518
         * Need to work out amount of data available to the inner content and
519
         * where it starts: so read in EXPLICIT header to get the info.
520
         */
521
0
        ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst,
522
0
                              &p, inlen, tt->tag, aclass, opt, ctx);
523
0
        q = p;
524
0
        if (!ret) {
525
0
            ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
526
0
            return 0;
527
0
        } else if (ret == -1)
528
0
            return -1;
529
0
        if (!cst) {
530
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);
531
0
            return 0;
532
0
        }
533
        /* We've found the field so it can't be OPTIONAL now */
534
0
        ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx, depth, libctx,
535
0
                                      propq);
536
0
        if (!ret) {
537
0
            ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
538
0
            return 0;
539
0
        }
540
        /* We read the field in OK so update length */
541
0
        len -= p - q;
542
0
        if (exp_eoc) {
543
            /* If NDEF we must have an EOC here */
544
0
            if (!asn1_check_eoc(&p, len)) {
545
0
                ERR_raise(ERR_LIB_ASN1, ASN1_R_MISSING_EOC);
546
0
                goto err;
547
0
            }
548
0
        } else {
549
            /*
550
             * Otherwise we must hit the EXPLICIT tag end or its an error
551
             */
552
0
            if (len) {
553
0
                ERR_raise(ERR_LIB_ASN1, ASN1_R_EXPLICIT_LENGTH_MISMATCH);
554
0
                goto err;
555
0
            }
556
0
        }
557
0
    } else
558
0
        return asn1_template_noexp_d2i(val, in, inlen, tt, opt, ctx, depth,
559
0
                                       libctx, propq);
560
561
0
    *in = p;
562
0
    return 1;
563
564
0
 err:
565
0
    return 0;
566
0
}
567
568
static int asn1_template_noexp_d2i(ASN1_VALUE **val,
569
                                   const unsigned char **in, long len,
570
                                   const ASN1_TEMPLATE *tt, char opt,
571
                                   ASN1_TLC *ctx, int depth,
572
                                   OSSL_LIB_CTX *libctx, const char *propq)
573
0
{
574
0
    int flags, aclass;
575
0
    int ret;
576
0
    ASN1_VALUE *tval;
577
0
    const unsigned char *p, *q;
578
0
    if (!val)
579
0
        return 0;
580
0
    flags = tt->flags;
581
0
    aclass = flags & ASN1_TFLG_TAG_CLASS;
582
583
0
    p = *in;
584
585
    /*
586
     * If field is embedded then val needs fixing so it is a pointer to
587
     * a pointer to a field.
588
     */
589
0
    if (tt->flags & ASN1_TFLG_EMBED) {
590
0
        tval = (ASN1_VALUE *)val;
591
0
        val = &tval;
592
0
    }
593
594
0
    if (flags & ASN1_TFLG_SK_MASK) {
595
        /* SET OF, SEQUENCE OF */
596
0
        int sktag, skaclass;
597
0
        char sk_eoc;
598
        /* First work out expected inner tag value */
599
0
        if (flags & ASN1_TFLG_IMPTAG) {
600
0
            sktag = tt->tag;
601
0
            skaclass = aclass;
602
0
        } else {
603
0
            skaclass = V_ASN1_UNIVERSAL;
604
0
            if (flags & ASN1_TFLG_SET_OF)
605
0
                sktag = V_ASN1_SET;
606
0
            else
607
0
                sktag = V_ASN1_SEQUENCE;
608
0
        }
609
        /* Get the tag */
610
0
        ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL,
611
0
                              &p, len, sktag, skaclass, opt, ctx);
612
0
        if (!ret) {
613
0
            ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
614
0
            return 0;
615
0
        } else if (ret == -1)
616
0
            return -1;
617
0
        if (*val == NULL)
618
0
            *val = (ASN1_VALUE *)sk_ASN1_VALUE_new_null();
619
0
        else {
620
            /*
621
             * We've got a valid STACK: free up any items present
622
             */
623
0
            STACK_OF(ASN1_VALUE) *sktmp = (STACK_OF(ASN1_VALUE) *)*val;
624
0
            ASN1_VALUE *vtmp;
625
0
            while (sk_ASN1_VALUE_num(sktmp) > 0) {
626
0
                vtmp = sk_ASN1_VALUE_pop(sktmp);
627
0
                ASN1_item_ex_free(&vtmp, ASN1_ITEM_ptr(tt->item));
628
0
            }
629
0
        }
630
631
0
        if (*val == NULL) {
632
0
            ERR_raise(ERR_LIB_ASN1, ERR_R_CRYPTO_LIB);
633
0
            goto err;
634
0
        }
635
636
        /* Read as many items as we can */
637
0
        while (len > 0) {
638
0
            ASN1_VALUE *skfield;
639
0
            q = p;
640
            /* See if EOC found */
641
0
            if (asn1_check_eoc(&p, len)) {
642
0
                if (!sk_eoc) {
643
0
                    ERR_raise(ERR_LIB_ASN1, ASN1_R_UNEXPECTED_EOC);
644
0
                    goto err;
645
0
                }
646
0
                len -= p - q;
647
0
                sk_eoc = 0;
648
0
                break;
649
0
            }
650
0
            skfield = NULL;
651
0
            if (asn1_item_embed_d2i(&skfield, &p, len,
652
0
                                     ASN1_ITEM_ptr(tt->item), -1, 0, 0, ctx,
653
0
                                     depth, libctx, propq) <= 0) {
654
0
                ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
655
                /* |skfield| may be partially allocated despite failure. */
656
0
                ASN1_item_free(skfield, ASN1_ITEM_ptr(tt->item));
657
0
                goto err;
658
0
            }
659
0
            len -= p - q;
660
0
            if (!sk_ASN1_VALUE_push((STACK_OF(ASN1_VALUE) *)*val, skfield)) {
661
0
                ERR_raise(ERR_LIB_ASN1, ERR_R_CRYPTO_LIB);
662
0
                ASN1_item_free(skfield, ASN1_ITEM_ptr(tt->item));
663
0
                goto err;
664
0
            }
665
0
        }
666
0
        if (sk_eoc) {
667
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_MISSING_EOC);
668
0
            goto err;
669
0
        }
670
0
    } else if (flags & ASN1_TFLG_IMPTAG) {
671
        /* IMPLICIT tagging */
672
0
        ret = asn1_item_embed_d2i(val, &p, len,
673
0
                                  ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt,
674
0
                                  ctx, depth, libctx, propq);
675
0
        if (!ret) {
676
0
            ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
677
0
            goto err;
678
0
        } else if (ret == -1)
679
0
            return -1;
680
0
    } else {
681
        /* Nothing special */
682
0
        ret = asn1_item_embed_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item),
683
0
                                  -1, 0, opt, ctx, depth, libctx, propq);
684
0
        if (!ret) {
685
0
            ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
686
0
            goto err;
687
0
        } else if (ret == -1)
688
0
            return -1;
689
0
    }
690
691
0
    *in = p;
692
0
    return 1;
693
694
0
 err:
695
0
    return 0;
696
0
}
697
698
static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
699
                                 const unsigned char **in, long inlen,
700
                                 const ASN1_ITEM *it,
701
                                 int tag, int aclass, char opt, ASN1_TLC *ctx)
702
0
{
703
0
    int ret = 0, utype;
704
0
    long plen;
705
0
    char cst, inf, free_cont = 0;
706
0
    const unsigned char *p;
707
0
    BUF_MEM buf = { 0, NULL, 0, 0 };
708
0
    const unsigned char *cont = NULL;
709
0
    long len;
710
711
0
    if (pval == NULL) {
712
0
        ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_NULL);
713
0
        return 0;               /* Should never happen */
714
0
    }
715
716
0
    if (it->itype == ASN1_ITYPE_MSTRING) {
717
0
        utype = tag;
718
0
        tag = -1;
719
0
    } else
720
0
        utype = it->utype;
721
722
0
    if (utype == V_ASN1_ANY) {
723
        /* If type is ANY need to figure out type from tag */
724
0
        unsigned char oclass;
725
0
        if (tag >= 0) {
726
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_TAGGED_ANY);
727
0
            return 0;
728
0
        }
729
0
        if (opt) {
730
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_OPTIONAL_ANY);
731
0
            return 0;
732
0
        }
733
0
        p = *in;
734
0
        ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL,
735
0
                              &p, inlen, -1, 0, 0, ctx);
736
0
        if (!ret) {
737
0
            ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
738
0
            return 0;
739
0
        }
740
0
        if (oclass != V_ASN1_UNIVERSAL)
741
0
            utype = V_ASN1_OTHER;
742
0
    }
743
0
    if (tag == -1) {
744
0
        tag = utype;
745
0
        aclass = V_ASN1_UNIVERSAL;
746
0
    }
747
0
    p = *in;
748
    /* Check header */
749
0
    ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst,
750
0
                          &p, inlen, tag, aclass, opt, ctx);
751
0
    if (!ret) {
752
0
        ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
753
0
        return 0;
754
0
    } else if (ret == -1)
755
0
        return -1;
756
0
    ret = 0;
757
    /* SEQUENCE, SET and "OTHER" are left in encoded form */
758
0
    if ((utype == V_ASN1_SEQUENCE)
759
0
        || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER)) {
760
        /*
761
         * Clear context cache for type OTHER because the auto clear when we
762
         * have a exact match won't work
763
         */
764
0
        if (utype == V_ASN1_OTHER) {
765
0
            asn1_tlc_clear(ctx);
766
0
        }
767
        /* SEQUENCE and SET must be constructed */
768
0
        else if (!cst) {
769
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_TYPE_NOT_CONSTRUCTED);
770
0
            return 0;
771
0
        }
772
773
0
        cont = *in;
774
        /* If indefinite length constructed find the real end */
775
0
        if (inf) {
776
0
            if (!asn1_find_end(&p, plen, inf))
777
0
                goto err;
778
0
            len = p - cont;
779
0
        } else {
780
0
            len = p - cont + plen;
781
0
            p += plen;
782
0
        }
783
0
    } else if (cst) {
784
0
        if (utype == V_ASN1_NULL || utype == V_ASN1_BOOLEAN
785
0
            || utype == V_ASN1_OBJECT || utype == V_ASN1_INTEGER
786
0
            || utype == V_ASN1_ENUMERATED) {
787
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_TYPE_NOT_PRIMITIVE);
788
0
            return 0;
789
0
        }
790
791
        /* Free any returned 'buf' content */
792
0
        free_cont = 1;
793
        /*
794
         * Should really check the internal tags are correct but some things
795
         * may get this wrong. The relevant specs say that constructed string
796
         * types should be OCTET STRINGs internally irrespective of the type.
797
         * So instead just check for UNIVERSAL class and ignore the tag.
798
         */
799
0
        if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL, 0)) {
800
0
            goto err;
801
0
        }
802
0
        len = buf.length;
803
        /* Append a final null to string */
804
0
        if (!BUF_MEM_grow_clean(&buf, len + 1)) {
805
0
            ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB);
806
0
            goto err;
807
0
        }
808
0
        buf.data[len] = 0;
809
0
        cont = (const unsigned char *)buf.data;
810
0
    } else {
811
0
        cont = p;
812
0
        len = plen;
813
0
        p += plen;
814
0
    }
815
816
    /* We now have content length and type: translate into a structure */
817
    /* asn1_ex_c2i may reuse allocated buffer, and so sets free_cont to 0 */
818
0
    if (!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it))
819
0
        goto err;
820
821
0
    *in = p;
822
0
    ret = 1;
823
0
 err:
824
0
    if (free_cont)
825
0
        OPENSSL_free(buf.data);
826
0
    return ret;
827
0
}
828
829
/* Translate ASN1 content octets into a structure */
830
831
static int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
832
                       int utype, char *free_cont, const ASN1_ITEM *it)
833
0
{
834
0
    ASN1_VALUE **opval = NULL;
835
0
    ASN1_STRING *stmp;
836
0
    ASN1_TYPE *typ = NULL;
837
0
    int ret = 0;
838
0
    const ASN1_PRIMITIVE_FUNCS *pf;
839
0
    ASN1_INTEGER **tint;
840
0
    pf = it->funcs;
841
842
0
    if (pf && pf->prim_c2i)
843
0
        return pf->prim_c2i(pval, cont, len, utype, free_cont, it);
844
    /* If ANY type clear type and set pointer to internal value */
845
0
    if (it->utype == V_ASN1_ANY) {
846
0
        if (*pval == NULL) {
847
0
            typ = ASN1_TYPE_new();
848
0
            if (typ == NULL)
849
0
                goto err;
850
0
            *pval = (ASN1_VALUE *)typ;
851
0
        } else
852
0
            typ = (ASN1_TYPE *)*pval;
853
854
0
        if (utype != typ->type)
855
0
            ASN1_TYPE_set(typ, utype, NULL);
856
0
        opval = pval;
857
0
        pval = &typ->value.asn1_value;
858
0
    }
859
0
    switch (utype) {
860
0
    case V_ASN1_OBJECT:
861
0
        if (!ossl_c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len))
862
0
            goto err;
863
0
        break;
864
865
0
    case V_ASN1_NULL:
866
0
        if (len) {
867
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_NULL_IS_WRONG_LENGTH);
868
0
            goto err;
869
0
        }
870
0
        *pval = (ASN1_VALUE *)1;
871
0
        break;
872
873
0
    case V_ASN1_BOOLEAN:
874
0
        if (len != 1) {
875
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_BOOLEAN_IS_WRONG_LENGTH);
876
0
            goto err;
877
0
        } else {
878
0
            ASN1_BOOLEAN *tbool;
879
0
            tbool = (ASN1_BOOLEAN *)pval;
880
0
            *tbool = *cont;
881
0
        }
882
0
        break;
883
884
0
    case V_ASN1_BIT_STRING:
885
0
        if (!ossl_c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len))
886
0
            goto err;
887
0
        break;
888
889
0
    case V_ASN1_INTEGER:
890
0
    case V_ASN1_ENUMERATED:
891
0
        tint = (ASN1_INTEGER **)pval;
892
0
        if (!ossl_c2i_ASN1_INTEGER(tint, &cont, len))
893
0
            goto err;
894
        /* Fixup type to match the expected form */
895
0
        (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG);
896
0
        break;
897
898
0
    case V_ASN1_OCTET_STRING:
899
0
    case V_ASN1_NUMERICSTRING:
900
0
    case V_ASN1_PRINTABLESTRING:
901
0
    case V_ASN1_T61STRING:
902
0
    case V_ASN1_VIDEOTEXSTRING:
903
0
    case V_ASN1_IA5STRING:
904
0
    case V_ASN1_UTCTIME:
905
0
    case V_ASN1_GENERALIZEDTIME:
906
0
    case V_ASN1_GRAPHICSTRING:
907
0
    case V_ASN1_VISIBLESTRING:
908
0
    case V_ASN1_GENERALSTRING:
909
0
    case V_ASN1_UNIVERSALSTRING:
910
0
    case V_ASN1_BMPSTRING:
911
0
    case V_ASN1_UTF8STRING:
912
0
    case V_ASN1_OTHER:
913
0
    case V_ASN1_SET:
914
0
    case V_ASN1_SEQUENCE:
915
0
    default:
916
0
        if (utype == V_ASN1_BMPSTRING && (len & 1)) {
917
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_BMPSTRING_IS_WRONG_LENGTH);
918
0
            goto err;
919
0
        }
920
0
        if (utype == V_ASN1_UNIVERSALSTRING && (len & 3)) {
921
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_UNIVERSALSTRING_IS_WRONG_LENGTH);
922
0
            goto err;
923
0
        }
924
0
        if (utype == V_ASN1_GENERALIZEDTIME && (len < 15)) {
925
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_GENERALIZEDTIME_IS_TOO_SHORT);
926
0
            goto err;
927
0
        }
928
0
        if (utype == V_ASN1_UTCTIME && (len < 13)) {
929
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_UTCTIME_IS_TOO_SHORT);
930
0
            goto err;
931
0
        }
932
        /* All based on ASN1_STRING and handled the same */
933
0
        if (*pval == NULL) {
934
0
            stmp = ASN1_STRING_type_new(utype);
935
0
            if (stmp == NULL) {
936
0
                ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
937
0
                goto err;
938
0
            }
939
0
            *pval = (ASN1_VALUE *)stmp;
940
0
        } else {
941
0
            stmp = (ASN1_STRING *)*pval;
942
0
            stmp->type = utype;
943
0
        }
944
        /* If we've already allocated a buffer use it */
945
0
        if (*free_cont) {
946
0
            ASN1_STRING_set0(stmp, (unsigned char *)cont /* UGLY CAST! */, len);
947
0
            *free_cont = 0;
948
0
        } else {
949
0
            if (!ASN1_STRING_set(stmp, cont, len)) {
950
0
                ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
951
0
                ASN1_STRING_free(stmp);
952
0
                *pval = NULL;
953
0
                goto err;
954
0
            }
955
0
        }
956
0
        break;
957
0
    }
958
    /* If ASN1_ANY and NULL type fix up value */
959
0
    if (typ && (utype == V_ASN1_NULL))
960
0
        typ->value.ptr = NULL;
961
962
0
    ret = 1;
963
0
 err:
964
0
    if (!ret) {
965
0
        ASN1_TYPE_free(typ);
966
0
        if (opval)
967
0
            *opval = NULL;
968
0
    }
969
0
    return ret;
970
0
}
971
972
/*
973
 * This function finds the end of an ASN1 structure when passed its maximum
974
 * length, whether it is indefinite length and a pointer to the content. This
975
 * is more efficient than calling asn1_collect because it does not recurse on
976
 * each indefinite length header.
977
 */
978
979
static int asn1_find_end(const unsigned char **in, long len, char inf)
980
0
{
981
0
    uint32_t expected_eoc;
982
0
    long plen;
983
0
    const unsigned char *p = *in, *q;
984
    /* If not indefinite length constructed just add length */
985
0
    if (inf == 0) {
986
0
        *in += len;
987
0
        return 1;
988
0
    }
989
0
    expected_eoc = 1;
990
    /*
991
     * Indefinite length constructed form. Find the end when enough EOCs are
992
     * found. If more indefinite length constructed headers are encountered
993
     * increment the expected eoc count otherwise just skip to the end of the
994
     * data.
995
     */
996
0
    while (len > 0) {
997
0
        if (asn1_check_eoc(&p, len)) {
998
0
            expected_eoc--;
999
0
            if (expected_eoc == 0)
1000
0
                break;
1001
0
            len -= 2;
1002
0
            continue;
1003
0
        }
1004
0
        q = p;
1005
        /* Just read in a header: only care about the length */
1006
0
        if (!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len,
1007
0
                             -1, 0, 0, NULL)) {
1008
0
            ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
1009
0
            return 0;
1010
0
        }
1011
0
        if (inf) {
1012
0
            if (expected_eoc == UINT32_MAX) {
1013
0
                ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
1014
0
                return 0;
1015
0
            }
1016
0
            expected_eoc++;
1017
0
        } else {
1018
0
            p += plen;
1019
0
        }
1020
0
        len -= p - q;
1021
0
    }
1022
0
    if (expected_eoc) {
1023
0
        ERR_raise(ERR_LIB_ASN1, ASN1_R_MISSING_EOC);
1024
0
        return 0;
1025
0
    }
1026
0
    *in = p;
1027
0
    return 1;
1028
0
}
1029
1030
/*
1031
 * This function collects the asn1 data from a constructed string type into
1032
 * a buffer. The values of 'in' and 'len' should refer to the contents of the
1033
 * constructed type and 'inf' should be set if it is indefinite length.
1034
 */
1035
1036
#ifndef ASN1_MAX_STRING_NEST
1037
/*
1038
 * This determines how many levels of recursion are permitted in ASN1 string
1039
 * types. If it is not limited stack overflows can occur. If set to zero no
1040
 * recursion is allowed at all. Although zero should be adequate examples
1041
 * exist that require a value of 1. So 5 should be more than enough.
1042
 */
1043
0
# define ASN1_MAX_STRING_NEST 5
1044
#endif
1045
1046
static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
1047
                        char inf, int tag, int aclass, int depth)
1048
0
{
1049
0
    const unsigned char *p, *q;
1050
0
    long plen;
1051
0
    char cst, ininf;
1052
0
    p = *in;
1053
0
    inf &= 1;
1054
    /*
1055
     * If no buffer and not indefinite length constructed just pass over the
1056
     * encoded data
1057
     */
1058
0
    if (!buf && !inf) {
1059
0
        *in += len;
1060
0
        return 1;
1061
0
    }
1062
0
    while (len > 0) {
1063
0
        q = p;
1064
        /* Check for EOC */
1065
0
        if (asn1_check_eoc(&p, len)) {
1066
            /*
1067
             * EOC is illegal outside indefinite length constructed form
1068
             */
1069
0
            if (!inf) {
1070
0
                ERR_raise(ERR_LIB_ASN1, ASN1_R_UNEXPECTED_EOC);
1071
0
                return 0;
1072
0
            }
1073
0
            inf = 0;
1074
0
            break;
1075
0
        }
1076
1077
0
        if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p,
1078
0
                             len, tag, aclass, 0, NULL)) {
1079
0
            ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
1080
0
            return 0;
1081
0
        }
1082
1083
        /* If indefinite length constructed update max length */
1084
0
        if (cst) {
1085
0
            if (depth >= ASN1_MAX_STRING_NEST) {
1086
0
                ERR_raise(ERR_LIB_ASN1, ASN1_R_NESTED_ASN1_STRING);
1087
0
                return 0;
1088
0
            }
1089
0
            if (!asn1_collect(buf, &p, plen, ininf, tag, aclass, depth + 1))
1090
0
                return 0;
1091
0
        } else if (plen && !collect_data(buf, &p, plen))
1092
0
            return 0;
1093
0
        len -= p - q;
1094
0
    }
1095
0
    if (inf) {
1096
0
        ERR_raise(ERR_LIB_ASN1, ASN1_R_MISSING_EOC);
1097
0
        return 0;
1098
0
    }
1099
0
    *in = p;
1100
0
    return 1;
1101
0
}
1102
1103
static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen)
1104
0
{
1105
0
    int len;
1106
0
    if (buf) {
1107
0
        len = buf->length;
1108
0
        if (!BUF_MEM_grow_clean(buf, len + plen)) {
1109
0
            ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB);
1110
0
            return 0;
1111
0
        }
1112
0
        memcpy(buf->data + len, *p, plen);
1113
0
    }
1114
0
    *p += plen;
1115
0
    return 1;
1116
0
}
1117
1118
/* Check for ASN1 EOC and swallow it if found */
1119
1120
static int asn1_check_eoc(const unsigned char **in, long len)
1121
0
{
1122
0
    const unsigned char *p;
1123
1124
0
    if (len < 2)
1125
0
        return 0;
1126
0
    p = *in;
1127
0
    if (p[0] == '\0' && p[1] == '\0') {
1128
0
        *in += 2;
1129
0
        return 1;
1130
0
    }
1131
0
    return 0;
1132
0
}
1133
1134
/*
1135
 * Check an ASN1 tag and length: a bit like ASN1_get_object but it sets the
1136
 * length for indefinite length constructed form, we don't know the exact
1137
 * length but we can set an upper bound to the amount of data available minus
1138
 * the header length just read.
1139
 */
1140
1141
static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
1142
                           char *inf, char *cst,
1143
                           const unsigned char **in, long len,
1144
                           int exptag, int expclass, char opt, ASN1_TLC *ctx)
1145
0
{
1146
0
    int i;
1147
0
    int ptag, pclass;
1148
0
    long plen;
1149
0
    const unsigned char *p, *q;
1150
0
    p = *in;
1151
0
    q = p;
1152
1153
0
    if (len <= 0) {
1154
0
        ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_SMALL);
1155
0
        goto err;
1156
0
    }
1157
0
    if (ctx != NULL && ctx->valid) {
1158
0
        i = ctx->ret;
1159
0
        plen = ctx->plen;
1160
0
        pclass = ctx->pclass;
1161
0
        ptag = ctx->ptag;
1162
0
        p += ctx->hdrlen;
1163
0
    } else {
1164
0
        i = ASN1_get_object(&p, &plen, &ptag, &pclass, len);
1165
0
        if (ctx != NULL) {
1166
0
            ctx->ret = i;
1167
0
            ctx->plen = plen;
1168
0
            ctx->pclass = pclass;
1169
0
            ctx->ptag = ptag;
1170
0
            ctx->hdrlen = p - q;
1171
0
            ctx->valid = 1;
1172
            /*
1173
             * If definite length, and no error, length + header can't exceed
1174
             * total amount of data available.
1175
             */
1176
0
            if ((i & 0x81) == 0 && (plen + ctx->hdrlen) > len) {
1177
0
                ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LONG);
1178
0
                goto err;
1179
0
            }
1180
0
        }
1181
0
    }
1182
1183
0
    if ((i & 0x80) != 0) {
1184
0
        ERR_raise(ERR_LIB_ASN1, ASN1_R_BAD_OBJECT_HEADER);
1185
0
        goto err;
1186
0
    }
1187
0
    if (exptag >= 0) {
1188
0
        if (exptag != ptag || expclass != pclass) {
1189
            /*
1190
             * If type is OPTIONAL, not an error: indicate missing type.
1191
             */
1192
0
            if (opt != 0)
1193
0
                return -1;
1194
0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_WRONG_TAG);
1195
0
            goto err;
1196
0
        }
1197
        /*
1198
         * We have a tag and class match: assume we are going to do something
1199
         * with it
1200
         */
1201
0
        asn1_tlc_clear(ctx);
1202
0
    }
1203
1204
0
    if ((i & 1) != 0)
1205
0
        plen = len - (p - q);
1206
1207
0
    if (inf != NULL)
1208
0
        *inf = i & 1;
1209
1210
0
    if (cst != NULL)
1211
0
        *cst = i & V_ASN1_CONSTRUCTED;
1212
1213
0
    if (olen != NULL)
1214
0
        *olen = plen;
1215
1216
0
    if (oclass != NULL)
1217
0
        *oclass = pclass;
1218
1219
0
    if (otag != NULL)
1220
0
        *otag = ptag;
1221
1222
0
    *in = p;
1223
0
    return 1;
1224
1225
0
 err:
1226
0
    asn1_tlc_clear(ctx);
1227
0
    return 0;
1228
0
}