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Diffstat (limited to 'src/lib/libcrypto/asn1/tasn_dec.c')
-rw-r--r--src/lib/libcrypto/asn1/tasn_dec.c1188
1 files changed, 0 insertions, 1188 deletions
diff --git a/src/lib/libcrypto/asn1/tasn_dec.c b/src/lib/libcrypto/asn1/tasn_dec.c
deleted file mode 100644
index e75fe53633..0000000000
--- a/src/lib/libcrypto/asn1/tasn_dec.c
+++ /dev/null
@@ -1,1188 +0,0 @@
1/* $OpenBSD: tasn_dec.c,v 1.32 2016/05/04 15:00:24 tedu Exp $ */
2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 2000.
4 */
5/* ====================================================================
6 * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59
60#include <stddef.h>
61#include <string.h>
62#include <openssl/asn1.h>
63#include <openssl/asn1t.h>
64#include <openssl/objects.h>
65#include <openssl/buffer.h>
66#include <openssl/err.h>
67
68static int asn1_check_eoc(const unsigned char **in, long len);
69static int asn1_find_end(const unsigned char **in, long len, char inf);
70
71static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
72 char inf, int tag, int aclass, int depth);
73
74static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen);
75
76static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
77 char *inf, char *cst, const unsigned char **in, long len, int exptag,
78 int expclass, char opt, ASN1_TLC *ctx);
79
80static int asn1_template_ex_d2i(ASN1_VALUE **pval, const unsigned char **in,
81 long len, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx);
82static int asn1_template_noexp_d2i(ASN1_VALUE **val, const unsigned char **in,
83 long len, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx);
84static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, const unsigned char **in,
85 long len, const ASN1_ITEM *it, int tag, int aclass, char opt,
86 ASN1_TLC *ctx);
87
88/* Table to convert tags to bit values, used for MSTRING type */
89static const unsigned long tag2bit[32] = {
90 0, 0, 0, B_ASN1_BIT_STRING, /* tags 0 - 3 */
91 B_ASN1_OCTET_STRING, 0, 0, B_ASN1_UNKNOWN,/* tags 4- 7 */
92 B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,/* tags 8-11 */
93 B_ASN1_UTF8STRING,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,/* tags 12-15 */
94 B_ASN1_SEQUENCE,0,B_ASN1_NUMERICSTRING,B_ASN1_PRINTABLESTRING, /* tags 16-19 */
95 B_ASN1_T61STRING,B_ASN1_VIDEOTEXSTRING,B_ASN1_IA5STRING, /* tags 20-22 */
96 B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME, /* tags 23-24 */
97 B_ASN1_GRAPHICSTRING,B_ASN1_ISO64STRING,B_ASN1_GENERALSTRING, /* tags 25-27 */
98 B_ASN1_UNIVERSALSTRING,B_ASN1_UNKNOWN,B_ASN1_BMPSTRING,B_ASN1_UNKNOWN, /* tags 28-31 */
99};
100
101unsigned long
102ASN1_tag2bit(int tag)
103{
104 if ((tag < 0) || (tag > 30))
105 return 0;
106 return tag2bit[tag];
107}
108
109/* Macro to initialize and invalidate the cache */
110
111#define asn1_tlc_clear(c) if (c) (c)->valid = 0
112/* Version to avoid compiler warning about 'c' always non-NULL */
113#define asn1_tlc_clear_nc(c) (c)->valid = 0
114
115/* Decode an ASN1 item, this currently behaves just
116 * like a standard 'd2i' function. 'in' points to
117 * a buffer to read the data from, in future we will
118 * have more advanced versions that can input data
119 * a piece at a time and this will simply be a special
120 * case.
121 */
122
123ASN1_VALUE *
124ASN1_item_d2i(ASN1_VALUE **pval, const unsigned char **in, long len,
125 const ASN1_ITEM *it)
126{
127 ASN1_TLC c;
128 ASN1_VALUE *ptmpval = NULL;
129
130 if (!pval)
131 pval = &ptmpval;
132 asn1_tlc_clear_nc(&c);
133 if (ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0)
134 return *pval;
135 return NULL;
136}
137
138int
139ASN1_template_d2i(ASN1_VALUE **pval, const unsigned char **in, long len,
140 const ASN1_TEMPLATE *tt)
141{
142 ASN1_TLC c;
143
144 asn1_tlc_clear_nc(&c);
145 return asn1_template_ex_d2i(pval, in, len, tt, 0, &c);
146}
147
148
149/* Decode an item, taking care of IMPLICIT tagging, if any.
150 * If 'opt' set and tag mismatch return -1 to handle OPTIONAL
151 */
152
153int
154ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len,
155 const ASN1_ITEM *it, int tag, int aclass, char opt, ASN1_TLC *ctx)
156{
157 const ASN1_TEMPLATE *tt, *errtt = NULL;
158 const ASN1_EXTERN_FUNCS *ef;
159 const ASN1_AUX *aux = it->funcs;
160 ASN1_aux_cb *asn1_cb;
161 const unsigned char *p = NULL, *q;
162 unsigned char oclass;
163 char seq_eoc, seq_nolen, cst, isopt;
164 long tmplen;
165 int i;
166 int otag;
167 int ret = 0;
168 ASN1_VALUE **pchptr;
169 int combine;
170
171 combine = aclass & ASN1_TFLG_COMBINE;
172 aclass &= ~ASN1_TFLG_COMBINE;
173
174 if (!pval)
175 return 0;
176
177 if (aux && aux->asn1_cb)
178 asn1_cb = aux->asn1_cb;
179 else
180 asn1_cb = 0;
181
182 switch (it->itype) {
183 case ASN1_ITYPE_PRIMITIVE:
184 if (it->templates) {
185 /* tagging or OPTIONAL is currently illegal on an item
186 * template because the flags can't get passed down.
187 * In practice this isn't a problem: we include the
188 * relevant flags from the item template in the
189 * template itself.
190 */
191 if ((tag != -1) || opt) {
192 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
193 ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);
194 goto err;
195 }
196 return asn1_template_ex_d2i(pval, in, len,
197 it->templates, opt, ctx);
198 }
199 return asn1_d2i_ex_primitive(pval, in, len, it,
200 tag, aclass, opt, ctx);
201 break;
202
203 case ASN1_ITYPE_MSTRING:
204 p = *in;
205 /* Just read in tag and class */
206 ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL,
207 &p, len, -1, 0, 1, ctx);
208 if (!ret) {
209 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
210 ERR_R_NESTED_ASN1_ERROR);
211 goto err;
212 }
213
214 /* Must be UNIVERSAL class */
215 if (oclass != V_ASN1_UNIVERSAL) {
216 /* If OPTIONAL, assume this is OK */
217 if (opt)
218 return -1;
219 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
220 ASN1_R_MSTRING_NOT_UNIVERSAL);
221 goto err;
222 }
223 /* Check tag matches bit map */
224 if (!(ASN1_tag2bit(otag) & it->utype)) {
225 /* If OPTIONAL, assume this is OK */
226 if (opt)
227 return -1;
228 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
229 ASN1_R_MSTRING_WRONG_TAG);
230 goto err;
231 }
232 return asn1_d2i_ex_primitive(pval, in, len,
233 it, otag, 0, 0, ctx);
234
235 case ASN1_ITYPE_EXTERN:
236 /* Use new style d2i */
237 ef = it->funcs;
238 return ef->asn1_ex_d2i(pval, in, len,
239 it, tag, aclass, opt, ctx);
240
241 case ASN1_ITYPE_CHOICE:
242 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
243 goto auxerr;
244
245 if (*pval) {
246 /* Free up and zero CHOICE value if initialised */
247 i = asn1_get_choice_selector(pval, it);
248 if ((i >= 0) && (i < it->tcount)) {
249 tt = it->templates + i;
250 pchptr = asn1_get_field_ptr(pval, tt);
251 ASN1_template_free(pchptr, tt);
252 asn1_set_choice_selector(pval, -1, it);
253 }
254 } else if (!ASN1_item_ex_new(pval, it)) {
255 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
256 ERR_R_NESTED_ASN1_ERROR);
257 goto err;
258 }
259 /* CHOICE type, try each possibility in turn */
260 p = *in;
261 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
262 pchptr = asn1_get_field_ptr(pval, tt);
263 /* We mark field as OPTIONAL so its absence
264 * can be recognised.
265 */
266 ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx);
267 /* If field not present, try the next one */
268 if (ret == -1)
269 continue;
270 /* If positive return, read OK, break loop */
271 if (ret > 0)
272 break;
273 /* Otherwise must be an ASN1 parsing error */
274 errtt = tt;
275 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
276 ERR_R_NESTED_ASN1_ERROR);
277 goto err;
278 }
279
280 /* Did we fall off the end without reading anything? */
281 if (i == it->tcount) {
282 /* If OPTIONAL, this is OK */
283 if (opt) {
284 /* Free and zero it */
285 ASN1_item_ex_free(pval, it);
286 return -1;
287 }
288 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
289 ASN1_R_NO_MATCHING_CHOICE_TYPE);
290 goto err;
291 }
292
293 asn1_set_choice_selector(pval, i, it);
294 *in = p;
295 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
296 goto auxerr;
297 return 1;
298
299 case ASN1_ITYPE_NDEF_SEQUENCE:
300 case ASN1_ITYPE_SEQUENCE:
301 p = *in;
302 tmplen = len;
303
304 /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
305 if (tag == -1) {
306 tag = V_ASN1_SEQUENCE;
307 aclass = V_ASN1_UNIVERSAL;
308 }
309 /* Get SEQUENCE length and update len, p */
310 ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst,
311 &p, len, tag, aclass, opt, ctx);
312 if (!ret) {
313 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
314 ERR_R_NESTED_ASN1_ERROR);
315 goto err;
316 } else if (ret == -1)
317 return -1;
318 if (aux && (aux->flags & ASN1_AFLG_BROKEN)) {
319 len = tmplen - (p - *in);
320 seq_nolen = 1;
321 }
322 /* If indefinite we don't do a length check */
323 else
324 seq_nolen = seq_eoc;
325 if (!cst) {
326 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
327 ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
328 goto err;
329 }
330
331 if (!*pval && !ASN1_item_ex_new(pval, it)) {
332 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
333 ERR_R_NESTED_ASN1_ERROR);
334 goto err;
335 }
336
337 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
338 goto auxerr;
339
340 /* Free up and zero any ADB found */
341 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
342 if (tt->flags & ASN1_TFLG_ADB_MASK) {
343 const ASN1_TEMPLATE *seqtt;
344 ASN1_VALUE **pseqval;
345 seqtt = asn1_do_adb(pval, tt, 1);
346 if (!seqtt)
347 goto err;
348 pseqval = asn1_get_field_ptr(pval, seqtt);
349 ASN1_template_free(pseqval, seqtt);
350 }
351 }
352
353 /* Get each field entry */
354 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
355 const ASN1_TEMPLATE *seqtt;
356 ASN1_VALUE **pseqval;
357 seqtt = asn1_do_adb(pval, tt, 1);
358 if (!seqtt)
359 goto err;
360 pseqval = asn1_get_field_ptr(pval, seqtt);
361 /* Have we ran out of data? */
362 if (!len)
363 break;
364 q = p;
365 if (asn1_check_eoc(&p, len)) {
366 if (!seq_eoc) {
367 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
368 ASN1_R_UNEXPECTED_EOC);
369 goto err;
370 }
371 len -= p - q;
372 seq_eoc = 0;
373 q = p;
374 break;
375 }
376 /* This determines the OPTIONAL flag value. The field
377 * cannot be omitted if it is the last of a SEQUENCE
378 * and there is still data to be read. This isn't
379 * strictly necessary but it increases efficiency in
380 * some cases.
381 */
382 if (i == (it->tcount - 1))
383 isopt = 0;
384 else
385 isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
386 /* attempt to read in field, allowing each to be
387 * OPTIONAL */
388
389 ret = asn1_template_ex_d2i(pseqval, &p, len,
390 seqtt, isopt, ctx);
391 if (!ret) {
392 errtt = seqtt;
393 goto err;
394 } else if (ret == -1) {
395 /* OPTIONAL component absent.
396 * Free and zero the field.
397 */
398 ASN1_template_free(pseqval, seqtt);
399 continue;
400 }
401 /* Update length */
402 len -= p - q;
403 }
404
405 /* Check for EOC if expecting one */
406 if (seq_eoc && !asn1_check_eoc(&p, len)) {
407 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MISSING_EOC);
408 goto err;
409 }
410 /* Check all data read */
411 if (!seq_nolen && len) {
412 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
413 ASN1_R_SEQUENCE_LENGTH_MISMATCH);
414 goto err;
415 }
416
417 /* If we get here we've got no more data in the SEQUENCE,
418 * however we may not have read all fields so check all
419 * remaining are OPTIONAL and clear any that are.
420 */
421 for (; i < it->tcount; tt++, i++) {
422 const ASN1_TEMPLATE *seqtt;
423 seqtt = asn1_do_adb(pval, tt, 1);
424 if (!seqtt)
425 goto err;
426 if (seqtt->flags & ASN1_TFLG_OPTIONAL) {
427 ASN1_VALUE **pseqval;
428 pseqval = asn1_get_field_ptr(pval, seqtt);
429 ASN1_template_free(pseqval, seqtt);
430 } else {
431 errtt = seqtt;
432 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
433 ASN1_R_FIELD_MISSING);
434 goto err;
435 }
436 }
437 /* Save encoding */
438 if (!asn1_enc_save(pval, *in, p - *in, it)) {
439 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_MALLOC_FAILURE);
440 goto auxerr;
441 }
442 *in = p;
443 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
444 goto auxerr;
445 return 1;
446
447 default:
448 return 0;
449 }
450
451auxerr:
452 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_AUX_ERROR);
453err:
454 if (combine == 0)
455 ASN1_item_ex_free(pval, it);
456 if (errtt)
457 ERR_asprintf_error_data("Field=%s, Type=%s", errtt->field_name,
458 it->sname);
459 else
460 ERR_asprintf_error_data("Type=%s", it->sname);
461 return 0;
462}
463
464/* Templates are handled with two separate functions.
465 * One handles any EXPLICIT tag and the other handles the rest.
466 */
467
468static int
469asn1_template_ex_d2i(ASN1_VALUE **val, const unsigned char **in, long inlen,
470 const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx)
471{
472 int flags, aclass;
473 int ret;
474 long len;
475 const unsigned char *p, *q;
476 char exp_eoc;
477
478 if (!val)
479 return 0;
480 flags = tt->flags;
481 aclass = flags & ASN1_TFLG_TAG_CLASS;
482
483 p = *in;
484
485 /* Check if EXPLICIT tag expected */
486 if (flags & ASN1_TFLG_EXPTAG) {
487 char cst;
488 /* Need to work out amount of data available to the inner
489 * content and where it starts: so read in EXPLICIT header to
490 * get the info.
491 */
492 ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst,
493 &p, inlen, tt->tag, aclass, opt, ctx);
494 q = p;
495 if (!ret) {
496 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
497 ERR_R_NESTED_ASN1_ERROR);
498 return 0;
499 } else if (ret == -1)
500 return -1;
501 if (!cst) {
502 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
503 ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);
504 return 0;
505 }
506 /* We've found the field so it can't be OPTIONAL now */
507 ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx);
508 if (!ret) {
509 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
510 ERR_R_NESTED_ASN1_ERROR);
511 return 0;
512 }
513 /* We read the field in OK so update length */
514 len -= p - q;
515 if (exp_eoc) {
516 /* If NDEF we must have an EOC here */
517 if (!asn1_check_eoc(&p, len)) {
518 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
519 ASN1_R_MISSING_EOC);
520 goto err;
521 }
522 } else {
523 /* Otherwise we must hit the EXPLICIT tag end or its
524 * an error */
525 if (len) {
526 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
527 ASN1_R_EXPLICIT_LENGTH_MISMATCH);
528 goto err;
529 }
530 }
531 } else
532 return asn1_template_noexp_d2i(val, in, inlen, tt, opt, ctx);
533
534 *in = p;
535 return 1;
536
537err:
538 ASN1_template_free(val, tt);
539 return 0;
540}
541
542static int
543asn1_template_noexp_d2i(ASN1_VALUE **val, const unsigned char **in, long len,
544 const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx)
545{
546 int flags, aclass;
547 int ret;
548 const unsigned char *p, *q;
549
550 if (!val)
551 return 0;
552 flags = tt->flags;
553 aclass = flags & ASN1_TFLG_TAG_CLASS;
554
555 p = *in;
556 q = p;
557
558 if (flags & ASN1_TFLG_SK_MASK) {
559 /* SET OF, SEQUENCE OF */
560 int sktag, skaclass;
561 char sk_eoc;
562 /* First work out expected inner tag value */
563 if (flags & ASN1_TFLG_IMPTAG) {
564 sktag = tt->tag;
565 skaclass = aclass;
566 } else {
567 skaclass = V_ASN1_UNIVERSAL;
568 if (flags & ASN1_TFLG_SET_OF)
569 sktag = V_ASN1_SET;
570 else
571 sktag = V_ASN1_SEQUENCE;
572 }
573 /* Get the tag */
574 ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL,
575 &p, len, sktag, skaclass, opt, ctx);
576 if (!ret) {
577 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
578 ERR_R_NESTED_ASN1_ERROR);
579 return 0;
580 } else if (ret == -1)
581 return -1;
582 if (!*val)
583 *val = (ASN1_VALUE *)sk_new_null();
584 else {
585 /* We've got a valid STACK: free up any items present */
586 STACK_OF(ASN1_VALUE) *sktmp =
587 (STACK_OF(ASN1_VALUE) *)*val;
588 ASN1_VALUE *vtmp;
589 while (sk_ASN1_VALUE_num(sktmp) > 0) {
590 vtmp = sk_ASN1_VALUE_pop(sktmp);
591 ASN1_item_ex_free(&vtmp,
592 ASN1_ITEM_ptr(tt->item));
593 }
594 }
595
596 if (!*val) {
597 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
598 ERR_R_MALLOC_FAILURE);
599 goto err;
600 }
601
602 /* Read as many items as we can */
603 while (len > 0) {
604 ASN1_VALUE *skfield;
605 q = p;
606 /* See if EOC found */
607 if (asn1_check_eoc(&p, len)) {
608 if (!sk_eoc) {
609 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
610 ASN1_R_UNEXPECTED_EOC);
611 goto err;
612 }
613 len -= p - q;
614 sk_eoc = 0;
615 break;
616 }
617 skfield = NULL;
618 if (!ASN1_item_ex_d2i(&skfield, &p, len,
619 ASN1_ITEM_ptr(tt->item), -1, 0, 0, ctx)) {
620 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
621 ERR_R_NESTED_ASN1_ERROR);
622 goto err;
623 }
624 len -= p - q;
625 if (!sk_ASN1_VALUE_push((STACK_OF(ASN1_VALUE) *)*val,
626 skfield)) {
627 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
628 ERR_R_MALLOC_FAILURE);
629 goto err;
630 }
631 }
632 if (sk_eoc) {
633 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
634 ASN1_R_MISSING_EOC);
635 goto err;
636 }
637 } else if (flags & ASN1_TFLG_IMPTAG) {
638 /* IMPLICIT tagging */
639 ret = ASN1_item_ex_d2i(val, &p, len,
640 ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt, ctx);
641 if (!ret) {
642 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
643 ERR_R_NESTED_ASN1_ERROR);
644 goto err;
645 } else if (ret == -1)
646 return -1;
647 } else {
648 /* Nothing special */
649 ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item),
650 -1, tt->flags & ASN1_TFLG_COMBINE, opt, ctx);
651 if (!ret) {
652 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
653 ERR_R_NESTED_ASN1_ERROR);
654 goto err;
655 } else if (ret == -1)
656 return -1;
657 }
658
659 *in = p;
660 return 1;
661
662err:
663 ASN1_template_free(val, tt);
664 return 0;
665}
666
667static int
668asn1_d2i_ex_primitive(ASN1_VALUE **pval, const unsigned char **in, long inlen,
669 const ASN1_ITEM *it, int tag, int aclass, char opt, ASN1_TLC *ctx)
670{
671 int ret = 0, utype;
672 long plen;
673 char cst, inf, free_cont = 0;
674 const unsigned char *p;
675 BUF_MEM buf;
676 const unsigned char *cont = NULL;
677 long len;
678
679 buf.length = 0;
680 buf.max = 0;
681 buf.data = NULL;
682
683 if (!pval) {
684 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL);
685 return 0; /* Should never happen */
686 }
687
688 if (it->itype == ASN1_ITYPE_MSTRING) {
689 utype = tag;
690 tag = -1;
691 } else
692 utype = it->utype;
693
694 if (utype == V_ASN1_ANY) {
695 /* If type is ANY need to figure out type from tag */
696 unsigned char oclass;
697 if (tag >= 0) {
698 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
699 ASN1_R_ILLEGAL_TAGGED_ANY);
700 return 0;
701 }
702 if (opt) {
703 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
704 ASN1_R_ILLEGAL_OPTIONAL_ANY);
705 return 0;
706 }
707 p = *in;
708 ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL,
709 &p, inlen, -1, 0, 0, ctx);
710 if (!ret) {
711 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
712 ERR_R_NESTED_ASN1_ERROR);
713 return 0;
714 }
715 if (oclass != V_ASN1_UNIVERSAL)
716 utype = V_ASN1_OTHER;
717 }
718 if (tag == -1) {
719 tag = utype;
720 aclass = V_ASN1_UNIVERSAL;
721 }
722 p = *in;
723 /* Check header */
724 ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst,
725 &p, inlen, tag, aclass, opt, ctx);
726 if (!ret) {
727 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
728 return 0;
729 } else if (ret == -1)
730 return -1;
731 ret = 0;
732 /* SEQUENCE, SET and "OTHER" are left in encoded form */
733 if ((utype == V_ASN1_SEQUENCE) || (utype == V_ASN1_SET) ||
734 (utype == V_ASN1_OTHER)) {
735 /* Clear context cache for type OTHER because the auto clear
736 * when we have a exact match wont work
737 */
738 if (utype == V_ASN1_OTHER) {
739 asn1_tlc_clear(ctx);
740 }
741 /* SEQUENCE and SET must be constructed */
742 else if (!cst) {
743 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
744 ASN1_R_TYPE_NOT_CONSTRUCTED);
745 return 0;
746 }
747
748 cont = *in;
749 /* If indefinite length constructed find the real end */
750 if (inf) {
751 if (!asn1_find_end(&p, plen, inf))
752 goto err;
753 len = p - cont;
754 } else {
755 len = p - cont + plen;
756 p += plen;
757 buf.data = NULL;
758 }
759 } else if (cst) {
760 /* Should really check the internal tags are correct but
761 * some things may get this wrong. The relevant specs
762 * say that constructed string types should be OCTET STRINGs
763 * internally irrespective of the type. So instead just check
764 * for UNIVERSAL class and ignore the tag.
765 */
766 if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL, 0)) {
767 free_cont = 1;
768 goto err;
769 }
770 len = buf.length;
771 /* Append a final null to string */
772 if (!BUF_MEM_grow_clean(&buf, len + 1)) {
773 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
774 ERR_R_MALLOC_FAILURE);
775 return 0;
776 }
777 buf.data[len] = 0;
778 cont = (const unsigned char *)buf.data;
779 free_cont = 1;
780 } else {
781 cont = p;
782 len = plen;
783 p += plen;
784 }
785
786 /* We now have content length and type: translate into a structure */
787 if (!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it))
788 goto err;
789
790 *in = p;
791 ret = 1;
792
793err:
794 if (free_cont && buf.data)
795 free(buf.data);
796 return ret;
797}
798
799/* Translate ASN1 content octets into a structure */
800
801int
802asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype,
803 char *free_cont, const ASN1_ITEM *it)
804{
805 ASN1_VALUE **opval = NULL;
806 ASN1_STRING *stmp;
807 ASN1_TYPE *typ = NULL;
808 int ret = 0;
809 const ASN1_PRIMITIVE_FUNCS *pf;
810 ASN1_INTEGER **tint;
811
812 pf = it->funcs;
813
814 if (pf && pf->prim_c2i)
815 return pf->prim_c2i(pval, cont, len, utype, free_cont, it);
816 /* If ANY type clear type and set pointer to internal value */
817 if (it->utype == V_ASN1_ANY) {
818 if (!*pval) {
819 typ = ASN1_TYPE_new();
820 if (typ == NULL)
821 goto err;
822 *pval = (ASN1_VALUE *)typ;
823 } else
824 typ = (ASN1_TYPE *)*pval;
825
826 if (utype != typ->type)
827 ASN1_TYPE_set(typ, utype, NULL);
828 opval = pval;
829 pval = &typ->value.asn1_value;
830 }
831 switch (utype) {
832 case V_ASN1_OBJECT:
833 if (!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len))
834 goto err;
835 break;
836
837 case V_ASN1_NULL:
838 if (len) {
839 ASN1err(ASN1_F_ASN1_EX_C2I,
840 ASN1_R_NULL_IS_WRONG_LENGTH);
841 goto err;
842 }
843 *pval = (ASN1_VALUE *)1;
844 break;
845
846 case V_ASN1_BOOLEAN:
847 if (len != 1) {
848 ASN1err(ASN1_F_ASN1_EX_C2I,
849 ASN1_R_BOOLEAN_IS_WRONG_LENGTH);
850 goto err;
851 } else {
852 ASN1_BOOLEAN *tbool;
853 tbool = (ASN1_BOOLEAN *)pval;
854 *tbool = *cont;
855 }
856 break;
857
858 case V_ASN1_BIT_STRING:
859 if (!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len))
860 goto err;
861 break;
862
863 case V_ASN1_INTEGER:
864 case V_ASN1_ENUMERATED:
865 tint = (ASN1_INTEGER **)pval;
866 if (!c2i_ASN1_INTEGER(tint, &cont, len))
867 goto err;
868 /* Fixup type to match the expected form */
869 (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG);
870 break;
871
872 case V_ASN1_OCTET_STRING:
873 case V_ASN1_NUMERICSTRING:
874 case V_ASN1_PRINTABLESTRING:
875 case V_ASN1_T61STRING:
876 case V_ASN1_VIDEOTEXSTRING:
877 case V_ASN1_IA5STRING:
878 case V_ASN1_UTCTIME:
879 case V_ASN1_GENERALIZEDTIME:
880 case V_ASN1_GRAPHICSTRING:
881 case V_ASN1_VISIBLESTRING:
882 case V_ASN1_GENERALSTRING:
883 case V_ASN1_UNIVERSALSTRING:
884 case V_ASN1_BMPSTRING:
885 case V_ASN1_UTF8STRING:
886 case V_ASN1_OTHER:
887 case V_ASN1_SET:
888 case V_ASN1_SEQUENCE:
889 default:
890 if (utype == V_ASN1_BMPSTRING && (len & 1)) {
891 ASN1err(ASN1_F_ASN1_EX_C2I,
892 ASN1_R_BMPSTRING_IS_WRONG_LENGTH);
893 goto err;
894 }
895 if (utype == V_ASN1_UNIVERSALSTRING && (len & 3)) {
896 ASN1err(ASN1_F_ASN1_EX_C2I,
897 ASN1_R_UNIVERSALSTRING_IS_WRONG_LENGTH);
898 goto err;
899 }
900 /* All based on ASN1_STRING and handled the same */
901 if (!*pval) {
902 stmp = ASN1_STRING_type_new(utype);
903 if (!stmp) {
904 ASN1err(ASN1_F_ASN1_EX_C2I,
905 ERR_R_MALLOC_FAILURE);
906 goto err;
907 }
908 *pval = (ASN1_VALUE *)stmp;
909 } else {
910 stmp = (ASN1_STRING *)*pval;
911 stmp->type = utype;
912 }
913 /* If we've already allocated a buffer use it */
914 if (*free_cont) {
915 free(stmp->data);
916 stmp->data = (unsigned char *)cont; /* UGLY CAST! RL */
917 stmp->length = len;
918 *free_cont = 0;
919 } else {
920 if (!ASN1_STRING_set(stmp, cont, len)) {
921 ASN1err(ASN1_F_ASN1_EX_C2I,
922 ERR_R_MALLOC_FAILURE);
923 ASN1_STRING_free(stmp);
924 *pval = NULL;
925 goto err;
926 }
927 }
928 break;
929 }
930 /* If ASN1_ANY and NULL type fix up value */
931 if (typ && (utype == V_ASN1_NULL))
932 typ->value.ptr = NULL;
933
934 ret = 1;
935
936err:
937 if (!ret) {
938 ASN1_TYPE_free(typ);
939 if (opval)
940 *opval = NULL;
941 }
942 return ret;
943}
944
945
946/* This function finds the end of an ASN1 structure when passed its maximum
947 * length, whether it is indefinite length and a pointer to the content.
948 * This is more efficient than calling asn1_collect because it does not
949 * recurse on each indefinite length header.
950 */
951
952static int
953asn1_find_end(const unsigned char **in, long len, char inf)
954{
955 int expected_eoc;
956 long plen;
957 const unsigned char *p = *in, *q;
958
959 /* If not indefinite length constructed just add length */
960 if (inf == 0) {
961 *in += len;
962 return 1;
963 }
964 expected_eoc = 1;
965 /* Indefinite length constructed form. Find the end when enough EOCs
966 * are found. If more indefinite length constructed headers
967 * are encountered increment the expected eoc count otherwise just
968 * skip to the end of the data.
969 */
970 while (len > 0) {
971 if (asn1_check_eoc(&p, len)) {
972 expected_eoc--;
973 if (expected_eoc == 0)
974 break;
975 len -= 2;
976 continue;
977 }
978 q = p;
979 /* Just read in a header: only care about the length */
980 if (!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len,
981 -1, 0, 0, NULL)) {
982 ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR);
983 return 0;
984 }
985 if (inf)
986 expected_eoc++;
987 else
988 p += plen;
989 len -= p - q;
990 }
991 if (expected_eoc) {
992 ASN1err(ASN1_F_ASN1_FIND_END, ASN1_R_MISSING_EOC);
993 return 0;
994 }
995 *in = p;
996 return 1;
997}
998/* This function collects the asn1 data from a constructred string
999 * type into a buffer. The values of 'in' and 'len' should refer
1000 * to the contents of the constructed type and 'inf' should be set
1001 * if it is indefinite length.
1002 */
1003
1004#ifndef ASN1_MAX_STRING_NEST
1005/* This determines how many levels of recursion are permitted in ASN1
1006 * string types. If it is not limited stack overflows can occur. If set
1007 * to zero no recursion is allowed at all. Although zero should be adequate
1008 * examples exist that require a value of 1. So 5 should be more than enough.
1009 */
1010#define ASN1_MAX_STRING_NEST 5
1011#endif
1012
1013static int
1014asn1_collect(BUF_MEM *buf, const unsigned char **in, long len, char inf,
1015 int tag, int aclass, int depth)
1016{
1017 const unsigned char *p, *q;
1018 long plen;
1019 char cst, ininf;
1020
1021 p = *in;
1022 inf &= 1;
1023 /* If no buffer and not indefinite length constructed just pass over
1024 * the encoded data */
1025 if (!buf && !inf) {
1026 *in += len;
1027 return 1;
1028 }
1029 while (len > 0) {
1030 q = p;
1031 /* Check for EOC */
1032 if (asn1_check_eoc(&p, len)) {
1033 /* EOC is illegal outside indefinite length
1034 * constructed form */
1035 if (!inf) {
1036 ASN1err(ASN1_F_ASN1_COLLECT,
1037 ASN1_R_UNEXPECTED_EOC);
1038 return 0;
1039 }
1040 inf = 0;
1041 break;
1042 }
1043
1044 if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p,
1045 len, tag, aclass, 0, NULL)) {
1046 ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR);
1047 return 0;
1048 }
1049
1050 /* If indefinite length constructed update max length */
1051 if (cst) {
1052 if (depth >= ASN1_MAX_STRING_NEST) {
1053 ASN1err(ASN1_F_ASN1_COLLECT,
1054 ASN1_R_NESTED_ASN1_STRING);
1055 return 0;
1056 }
1057 if (!asn1_collect(buf, &p, plen, ininf, tag, aclass,
1058 depth + 1))
1059 return 0;
1060 } else if (plen && !collect_data(buf, &p, plen))
1061 return 0;
1062 len -= p - q;
1063 }
1064 if (inf) {
1065 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC);
1066 return 0;
1067 }
1068 *in = p;
1069 return 1;
1070}
1071
1072static int
1073collect_data(BUF_MEM *buf, const unsigned char **p, long plen)
1074{
1075 int len;
1076 if (buf) {
1077 len = buf->length;
1078 if (!BUF_MEM_grow_clean(buf, len + plen)) {
1079 ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE);
1080 return 0;
1081 }
1082 memcpy(buf->data + len, *p, plen);
1083 }
1084 *p += plen;
1085 return 1;
1086}
1087
1088/* Check for ASN1 EOC and swallow it if found */
1089
1090static int
1091asn1_check_eoc(const unsigned char **in, long len)
1092{
1093 const unsigned char *p;
1094
1095 if (len < 2)
1096 return 0;
1097 p = *in;
1098 if (!p[0] && !p[1]) {
1099 *in += 2;
1100 return 1;
1101 }
1102 return 0;
1103}
1104
1105/* Check an ASN1 tag and length: a bit like ASN1_get_object
1106 * but it sets the length for indefinite length constructed
1107 * form, we don't know the exact length but we can set an
1108 * upper bound to the amount of data available minus the
1109 * header length just read.
1110 */
1111
1112static int
1113asn1_check_tlen(long *olen, int *otag, unsigned char *oclass, char *inf,
1114 char *cst, const unsigned char **in, long len, int exptag, int expclass,
1115 char opt, ASN1_TLC *ctx)
1116{
1117 int i;
1118 int ptag, pclass;
1119 long plen;
1120 const unsigned char *p, *q;
1121
1122 p = *in;
1123 q = p;
1124
1125 if (ctx && ctx->valid) {
1126 i = ctx->ret;
1127 plen = ctx->plen;
1128 pclass = ctx->pclass;
1129 ptag = ctx->ptag;
1130 p += ctx->hdrlen;
1131 } else {
1132 i = ASN1_get_object(&p, &plen, &ptag, &pclass, len);
1133 if (ctx) {
1134 ctx->ret = i;
1135 ctx->plen = plen;
1136 ctx->pclass = pclass;
1137 ctx->ptag = ptag;
1138 ctx->hdrlen = p - q;
1139 ctx->valid = 1;
1140 /* If definite length, and no error, length +
1141 * header can't exceed total amount of data available.
1142 */
1143 if (!(i & 0x81) && ((plen + ctx->hdrlen) > len)) {
1144 ASN1err(ASN1_F_ASN1_CHECK_TLEN,
1145 ASN1_R_TOO_LONG);
1146 asn1_tlc_clear(ctx);
1147 return 0;
1148 }
1149 }
1150 }
1151
1152 if (i & 0x80) {
1153 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER);
1154 asn1_tlc_clear(ctx);
1155 return 0;
1156 }
1157 if (exptag >= 0) {
1158 if ((exptag != ptag) || (expclass != pclass)) {
1159 /* If type is OPTIONAL, not an error:
1160 * indicate missing type.
1161 */
1162 if (opt)
1163 return -1;
1164 asn1_tlc_clear(ctx);
1165 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG);
1166 return 0;
1167 }
1168 /* We have a tag and class match:
1169 * assume we are going to do something with it */
1170 asn1_tlc_clear(ctx);
1171 }
1172
1173 if (i & 1)
1174 plen = len - (p - q);
1175 if (inf)
1176 *inf = i & 1;
1177 if (cst)
1178 *cst = i & V_ASN1_CONSTRUCTED;
1179 if (olen)
1180 *olen = plen;
1181 if (oclass)
1182 *oclass = pclass;
1183 if (otag)
1184 *otag = ptag;
1185
1186 *in = p;
1187 return 1;
1188}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-05-07 21:04:18 +0000