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Make ASN1 code work again...
[thirdparty/openssl.git] / crypto / asn1 / tasn_dec.c
1 /* tasn_dec.c */
2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
3 * project 2000.
4 */
5 /* ====================================================================
6 * Copyright (c) 2000-2004 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
68 static int asn1_check_eoc(const unsigned char **in, long len);
69
70 static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
71 char inf, int tag, int aclass);
72
73 static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen);
74
75 static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
76 char *inf, char *cst,
77 const unsigned char **in, long len,
78 int exptag, int expclass, char opt,
79 ASN1_TLC *ctx);
80
81 static int asn1_template_ex_d2i(ASN1_VALUE **pval,
82 const unsigned char **in, long len,
83 const ASN1_TEMPLATE *tt, char opt,
84 ASN1_TLC *ctx);
85 static int asn1_template_noexp_d2i(ASN1_VALUE **val,
86 const unsigned char **in, long len,
87 const ASN1_TEMPLATE *tt, char opt,
88 ASN1_TLC *ctx);
89 static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
90 const unsigned char **in, long len,
91 const ASN1_ITEM *it,
92 int tag, int aclass, char opt, ASN1_TLC *ctx);
93
94 /* Table to convert tags to bit values, used for MSTRING type */
95 static unsigned long tag2bit[32] = {
96 0, 0, 0, B_ASN1_BIT_STRING, /* tags 0 - 3 */
97 B_ASN1_OCTET_STRING, 0, 0, B_ASN1_UNKNOWN,/* tags 4- 7 */
98 B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,/* tags 8-11 */
99 B_ASN1_UTF8STRING,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,/* tags 12-15 */
100 0, 0, B_ASN1_NUMERICSTRING,B_ASN1_PRINTABLESTRING, /* tags 16-19 */
101 B_ASN1_T61STRING,B_ASN1_VIDEOTEXSTRING,B_ASN1_IA5STRING, /* tags 20-22 */
102 B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME, /* tags 23-24 */
103 B_ASN1_GRAPHICSTRING,B_ASN1_ISO64STRING,B_ASN1_GENERALSTRING, /* tags 25-27 */
104 B_ASN1_UNIVERSALSTRING,B_ASN1_UNKNOWN,B_ASN1_BMPSTRING,B_ASN1_UNKNOWN, /* tags 28-31 */
105 };
106
107 unsigned long ASN1_tag2bit(int tag)
108 {
109 if ((tag < 0) || (tag > 30)) return 0;
110 return tag2bit[tag];
111 }
112
113 /* Macro to initialize and invalidate the cache */
114
115 #define asn1_tlc_clear(c) if (c) (c)->valid = 0
116
117 /* Decode an ASN1 item, this currently behaves just
118 * like a standard 'd2i' function. 'in' points to
119 * a buffer to read the data from, in future we will
120 * have more advanced versions that can input data
121 * a piece at a time and this will simply be a special
122 * case.
123 */
124
125 ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval,
126 const unsigned char **in, long len, const ASN1_ITEM *it)
127 {
128 ASN1_TLC c;
129 ASN1_VALUE *ptmpval = NULL;
130 if (!pval)
131 pval = &ptmpval;
132 asn1_tlc_clear(&c);
133 if (ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0)
134 return *pval;
135 return NULL;
136 }
137
138 int ASN1_template_d2i(ASN1_VALUE **pval,
139 const unsigned char **in, long len, const ASN1_TEMPLATE *tt)
140 {
141 ASN1_TLC c;
142 asn1_tlc_clear(&c);
143 return asn1_template_ex_d2i(pval, in, len, tt, 0, &c);
144 }
145
146
147 /* Decode an item, taking care of IMPLICIT tagging, if any.
148 * If 'opt' set and tag mismatch return -1 to handle OPTIONAL
149 */
150
151 int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len,
152 const ASN1_ITEM *it,
153 int tag, int aclass, char opt, ASN1_TLC *ctx)
154 {
155 const ASN1_TEMPLATE *tt, *errtt = NULL;
156 const ASN1_COMPAT_FUNCS *cf;
157 const ASN1_EXTERN_FUNCS *ef;
158 const ASN1_AUX *aux = it->funcs;
159 ASN1_aux_cb *asn1_cb;
160 const unsigned char *p, *q;
161 unsigned char *wp=NULL; /* BIG FAT WARNING! BREAKS CONST WHERE USED */
162 unsigned char imphack = 0, 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 *pchval, **pchptr, *ptmpval;
169 if (!pval)
170 return 0;
171 if (aux && aux->asn1_cb)
172 asn1_cb = aux->asn1_cb;
173 else asn1_cb = 0;
174
175 switch(it->itype)
176 {
177 case ASN1_ITYPE_PRIMITIVE:
178 if (it->templates)
179 {
180 /* tagging or OPTIONAL is currently illegal on an item
181 * template because the flags can't get passed down.
182 * In practice this isn't a problem: we include the
183 * relevant flags from the item template in the
184 * template itself.
185 */
186 if ((tag != -1) || opt)
187 {
188 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
189 ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);
190 goto err;
191 }
192 return asn1_template_ex_d2i(pval, in, len,
193 it->templates, opt, ctx);
194 }
195 return asn1_d2i_ex_primitive(pval, in, len, it,
196 tag, aclass, opt, ctx);
197 break;
198
199 case ASN1_ITYPE_MSTRING:
200 p = *in;
201 /* Just read in tag and class */
202 ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL,
203 &p, len, -1, 0, 1, ctx);
204 if (!ret)
205 {
206 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
207 ERR_R_NESTED_ASN1_ERROR);
208 goto err;
209 }
210
211 /* Must be UNIVERSAL class */
212 if (oclass != V_ASN1_UNIVERSAL)
213 {
214 /* If OPTIONAL, assume this is OK */
215 if (opt) return -1;
216 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
217 ASN1_R_MSTRING_NOT_UNIVERSAL);
218 goto err;
219 }
220 /* Check tag matches bit map */
221 if (!(ASN1_tag2bit(otag) & it->utype))
222 {
223 /* If OPTIONAL, assume this is OK */
224 if (opt)
225 return -1;
226 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
227 ASN1_R_MSTRING_WRONG_TAG);
228 goto err;
229 }
230 return asn1_d2i_ex_primitive(pval, in, len,
231 it, otag, 0, 0, ctx);
232
233 case ASN1_ITYPE_EXTERN:
234 /* Use new style d2i */
235 ef = it->funcs;
236 return ef->asn1_ex_d2i(pval, in, len,
237 it, tag, aclass, opt, ctx);
238
239 case ASN1_ITYPE_COMPAT:
240 /* we must resort to old style evil hackery */
241 cf = it->funcs;
242
243 /* If OPTIONAL see if it is there */
244 if (opt)
245 {
246 int exptag;
247 p = *in;
248 if (tag == -1)
249 exptag = it->utype;
250 else exptag = tag;
251 /* Don't care about anything other than presence
252 * of expected tag */
253
254 ret = asn1_check_tlen(NULL, NULL, NULL, NULL, NULL,
255 &p, len, exptag, aclass, 1, ctx);
256 if (!ret)
257 {
258 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
259 ERR_R_NESTED_ASN1_ERROR);
260 goto err;
261 }
262 if (ret == -1)
263 return -1;
264 }
265
266 /* This is the old style evil hack IMPLICIT handling:
267 * since the underlying code is expecting a tag and
268 * class other than the one present we change the
269 * buffer temporarily then change it back afterwards.
270 * This doesn't and never did work for tags > 30.
271 *
272 * Yes this is *horrible* but it is only needed for
273 * old style d2i which will hopefully not be around
274 * for much longer.
275 * FIXME: should copy the buffer then modify it so
276 * the input buffer can be const: we should *always*
277 * copy because the old style d2i might modify the
278 * buffer.
279 */
280
281 if (tag != -1)
282 {
283 wp = *(unsigned char **)in;
284 imphack = *wp;
285 *wp = (unsigned char)((*p & V_ASN1_CONSTRUCTED)
286 | it->utype);
287 }
288
289 ptmpval = cf->asn1_d2i(pval, in, len);
290
291 if (tag != -1)
292 *wp = imphack;
293
294 if (ptmpval)
295 return 1;
296
297 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
298 goto err;
299
300
301 case ASN1_ITYPE_CHOICE:
302 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))
303 goto auxerr;
304
305 /* Allocate structure */
306 if (!*pval && !ASN1_item_ex_new(pval, it))
307 {
308 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
309 ERR_R_NESTED_ASN1_ERROR);
310 goto err;
311 }
312 /* CHOICE type, try each possibility in turn */
313 pchval = NULL;
314 p = *in;
315 for (i = 0, tt=it->templates; i < it->tcount; i++, tt++)
316 {
317 pchptr = asn1_get_field_ptr(pval, tt);
318 /* We mark field as OPTIONAL so its absence
319 * can be recognised.
320 */
321 ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx);
322 /* If field not present, try the next one */
323 if (ret == -1)
324 continue;
325 /* If positive return, read OK, break loop */
326 if (ret > 0)
327 break;
328 /* Otherwise must be an ASN1 parsing error */
329 errtt = tt;
330 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
331 ERR_R_NESTED_ASN1_ERROR);
332 goto err;
333 }
334
335 /* Did we fall off the end without reading anything? */
336 if (i == it->tcount)
337 {
338 /* If OPTIONAL, this is OK */
339 if (opt)
340 {
341 /* Free and zero it */
342 ASN1_item_ex_free(pval, it);
343 return -1;
344 }
345 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
346 ASN1_R_NO_MATCHING_CHOICE_TYPE);
347 goto err;
348 }
349
350 asn1_set_choice_selector(pval, i, it);
351 *in = p;
352 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))
353 goto auxerr;
354 return 1;
355
356 case ASN1_ITYPE_NDEF_SEQUENCE:
357 case ASN1_ITYPE_SEQUENCE:
358 p = *in;
359 tmplen = len;
360
361 /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
362 if (tag == -1)
363 {
364 tag = V_ASN1_SEQUENCE;
365 aclass = V_ASN1_UNIVERSAL;
366 }
367 /* Get SEQUENCE length and update len, p */
368 ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst,
369 &p, len, tag, aclass, opt, ctx);
370 if (!ret)
371 {
372 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
373 ERR_R_NESTED_ASN1_ERROR);
374 goto err;
375 }
376 else if (ret == -1)
377 return -1;
378 if (aux && (aux->flags & ASN1_AFLG_BROKEN))
379 {
380 len = tmplen - (p - *in);
381 seq_nolen = 1;
382 }
383 /* If indefinite we don't do a length check */
384 else seq_nolen = seq_eoc;
385 if (!cst)
386 {
387 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
388 ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
389 goto err;
390 }
391
392 if (!*pval && !ASN1_item_ex_new(pval, it))
393 {
394 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
395 ERR_R_NESTED_ASN1_ERROR);
396 goto err;
397 }
398
399 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))
400 goto auxerr;
401
402 /* Get each field entry */
403 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++)
404 {
405 const ASN1_TEMPLATE *seqtt;
406 ASN1_VALUE **pseqval;
407 seqtt = asn1_do_adb(pval, tt, 1);
408 if (!seqtt)
409 goto err;
410 pseqval = asn1_get_field_ptr(pval, seqtt);
411 /* Have we ran out of data? */
412 if (!len)
413 break;
414 q = p;
415 if (asn1_check_eoc(&p, len))
416 {
417 if (!seq_eoc)
418 {
419 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
420 ASN1_R_UNEXPECTED_EOC);
421 goto err;
422 }
423 len -= p - q;
424 seq_eoc = 0;
425 q = p;
426 break;
427 }
428 /* This determines the OPTIONAL flag value. The field
429 * cannot be omitted if it is the last of a SEQUENCE
430 * and there is still data to be read. This isn't
431 * strictly necessary but it increases efficiency in
432 * some cases.
433 */
434 if (i == (it->tcount - 1))
435 isopt = 0;
436 else isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
437 /* attempt to read in field, allowing each to be
438 * OPTIONAL */
439
440 ret = asn1_template_ex_d2i(pseqval, &p, len,
441 seqtt, isopt, ctx);
442 if (!ret)
443 {
444 errtt = seqtt;
445 goto err;
446 }
447 else if (ret == -1)
448 {
449 /* OPTIONAL component absent.
450 * Free and zero the field.
451 */
452 ASN1_template_free(pseqval, seqtt);
453 continue;
454 }
455 /* Update length */
456 len -= p - q;
457 }
458
459 /* Check for EOC if expecting one */
460 if (seq_eoc && !asn1_check_eoc(&p, len))
461 {
462 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MISSING_EOC);
463 goto err;
464 }
465 /* Check all data read */
466 if (!seq_nolen && len)
467 {
468 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
469 ASN1_R_SEQUENCE_LENGTH_MISMATCH);
470 goto err;
471 }
472
473 /* If we get here we've got no more data in the SEQUENCE,
474 * however we may not have read all fields so check all
475 * remaining are OPTIONAL and clear any that are.
476 */
477 for (; i < it->tcount; tt++, i++)
478 {
479 const ASN1_TEMPLATE *seqtt;
480 seqtt = asn1_do_adb(pval, tt, 1);
481 if (!seqtt)
482 goto err;
483 if (seqtt->flags & ASN1_TFLG_OPTIONAL)
484 {
485 ASN1_VALUE **pseqval;
486 pseqval = asn1_get_field_ptr(pval, seqtt);
487 ASN1_template_free(pseqval, seqtt);
488 }
489 else
490 {
491 errtt = seqtt;
492 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
493 ASN1_R_FIELD_MISSING);
494 goto err;
495 }
496 }
497 /* Save encoding */
498 if (!asn1_enc_save(pval, *in, p - *in, it))
499 goto auxerr;
500 *in = p;
501 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))
502 goto auxerr;
503 return 1;
504
505 default:
506 return 0;
507 }
508 auxerr:
509 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_AUX_ERROR);
510 err:
511 ASN1_item_ex_free(pval, it);
512 if (errtt)
513 ERR_add_error_data(4, "Field=", errtt->field_name,
514 ", Type=", it->sname);
515 else
516 ERR_add_error_data(2, "Type=", it->sname);
517 return 0;
518 }
519
520 /* Templates are handled with two separate functions.
521 * One handles any EXPLICIT tag and the other handles the rest.
522 */
523
524 static int asn1_template_ex_d2i(ASN1_VALUE **val,
525 const unsigned char **in, long inlen,
526 const ASN1_TEMPLATE *tt, char opt,
527 ASN1_TLC *ctx)
528 {
529 int flags, aclass;
530 int ret;
531 long len;
532 const unsigned char *p, *q;
533 char exp_eoc;
534 if (!val)
535 return 0;
536 flags = tt->flags;
537 aclass = flags & ASN1_TFLG_TAG_CLASS;
538
539 p = *in;
540
541 /* Check if EXPLICIT tag expected */
542 if (flags & ASN1_TFLG_EXPTAG)
543 {
544 char cst;
545 /* Need to work out amount of data available to the inner
546 * content and where it starts: so read in EXPLICIT header to
547 * get the info.
548 */
549 ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst,
550 &p, inlen, tt->tag, aclass, opt, ctx);
551 q = p;
552 if (!ret)
553 {
554 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
555 ERR_R_NESTED_ASN1_ERROR);
556 return 0;
557 }
558 else if (ret == -1)
559 return -1;
560 if (!cst)
561 {
562 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
563 ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);
564 return 0;
565 }
566 /* We've found the field so it can't be OPTIONAL now */
567 ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx);
568 if (!ret)
569 {
570 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
571 ERR_R_NESTED_ASN1_ERROR);
572 return 0;
573 }
574 /* We read the field in OK so update length */
575 len -= p - q;
576 if (exp_eoc)
577 {
578 /* If NDEF we must have an EOC here */
579 if (!asn1_check_eoc(&p, len))
580 {
581 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I,
582 ASN1_R_MISSING_EOC);
583 goto err;
584 }
585 }
586 else
587 {
588 /* Otherwise we must hit the EXPLICIT tag end or its
589 * an error */
590 if (len)
591 {
592 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I,
593 ASN1_R_EXPLICIT_LENGTH_MISMATCH);
594 goto err;
595 }
596 }
597 }
598 else
599 return asn1_template_noexp_d2i(val, in, inlen,
600 tt, opt, ctx);
601
602 *in = p;
603 return 1;
604
605 err:
606 ASN1_template_free(val, tt);
607 *val = NULL;
608 return 0;
609 }
610
611 static int asn1_template_noexp_d2i(ASN1_VALUE **val,
612 const unsigned char **in, long len,
613 const ASN1_TEMPLATE *tt, char opt,
614 ASN1_TLC *ctx)
615 {
616 int flags, aclass;
617 int ret;
618 const unsigned char *p, *q;
619 if (!val)
620 return 0;
621 flags = tt->flags;
622 aclass = flags & ASN1_TFLG_TAG_CLASS;
623
624 p = *in;
625 q = p;
626
627 if (flags & ASN1_TFLG_SK_MASK)
628 {
629 /* SET OF, SEQUENCE OF */
630 int sktag, skaclass;
631 char sk_eoc;
632 /* First work out expected inner tag value */
633 if (flags & ASN1_TFLG_IMPTAG)
634 {
635 sktag = tt->tag;
636 skaclass = aclass;
637 }
638 else
639 {
640 skaclass = V_ASN1_UNIVERSAL;
641 if (flags & ASN1_TFLG_SET_OF)
642 sktag = V_ASN1_SET;
643 else
644 sktag = V_ASN1_SEQUENCE;
645 }
646 /* Get the tag */
647 ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL,
648 &p, len, sktag, skaclass, opt, ctx);
649 if (!ret)
650 {
651 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
652 ERR_R_NESTED_ASN1_ERROR);
653 return 0;
654 }
655 else if (ret == -1)
656 return -1;
657 if (!*val)
658 *val = (ASN1_VALUE *)sk_new_null();
659 else
660 {
661 /* We've got a valid STACK: free up any items present */
662 STACK *sktmp = (STACK *)*val;
663 ASN1_VALUE *vtmp;
664 while(sk_num(sktmp) > 0)
665 {
666 vtmp = (ASN1_VALUE *)sk_pop(sktmp);
667 ASN1_item_ex_free(&vtmp,
668 ASN1_ITEM_ptr(tt->item));
669 }
670 }
671
672 if (!*val)
673 {
674 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
675 ERR_R_MALLOC_FAILURE);
676 goto err;
677 }
678
679 /* Read as many items as we can */
680 while(len > 0)
681 {
682 ASN1_VALUE *skfield;
683 q = p;
684 /* See if EOC found */
685 if (asn1_check_eoc(&p, len))
686 {
687 if (!sk_eoc)
688 {
689 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I,
690 ASN1_R_UNEXPECTED_EOC);
691 goto err;
692 }
693 len -= p - q;
694 sk_eoc = 0;
695 break;
696 }
697 skfield = NULL;
698 if (!ASN1_item_ex_d2i(&skfield, &p, len,
699 ASN1_ITEM_ptr(tt->item),
700 -1, 0, 0, ctx))
701 {
702 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I,
703 ERR_R_NESTED_ASN1_ERROR);
704 goto err;
705 }
706 len -= p - q;
707 if (!sk_push((STACK *)*val, (char *)skfield))
708 {
709 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I,
710 ERR_R_MALLOC_FAILURE);
711 goto err;
712 }
713 }
714 if (sk_eoc)
715 {
716 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ASN1_R_MISSING_EOC);
717 goto err;
718 }
719 }
720 else if (flags & ASN1_TFLG_IMPTAG)
721 {
722 /* IMPLICIT tagging */
723 ret = ASN1_item_ex_d2i(val, &p, len,
724 ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt, ctx);
725 if (!ret)
726 {
727 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I,
728 ERR_R_NESTED_ASN1_ERROR);
729 goto err;
730 }
731 else if (ret == -1)
732 return -1;
733 }
734 else
735 {
736 /* Nothing special */
737 ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item),
738 -1, 0, opt, ctx);
739 if (!ret)
740 {
741 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I,
742 ERR_R_NESTED_ASN1_ERROR);
743 goto err;
744 }
745 else if (ret == -1)
746 return -1;
747 }
748
749 *in = p;
750 return 1;
751
752 err:
753 ASN1_template_free(val, tt);
754 *val = NULL;
755 return 0;
756 }
757
758 static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
759 const unsigned char **in, long inlen,
760 const ASN1_ITEM *it,
761 int tag, int aclass, char opt, ASN1_TLC *ctx)
762 {
763 int ret = 0, utype;
764 long plen;
765 char cst, inf, free_cont = 0;
766 const unsigned char *p;
767 BUF_MEM buf;
768 const unsigned char *cont = NULL;
769 long len;
770 if (!pval)
771 {
772 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL);
773 return 0; /* Should never happen */
774 }
775
776 if (it->itype == ASN1_ITYPE_MSTRING)
777 {
778 utype = tag;
779 tag = -1;
780 }
781 else
782 utype = it->utype;
783
784 if (utype == V_ASN1_ANY)
785 {
786 /* If type is ANY need to figure out type from tag */
787 unsigned char oclass;
788 if (tag >= 0)
789 {
790 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
791 ASN1_R_ILLEGAL_TAGGED_ANY);
792 return 0;
793 }
794 if (opt)
795 {
796 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
797 ASN1_R_ILLEGAL_OPTIONAL_ANY);
798 return 0;
799 }
800 p = *in;
801 ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL,
802 &p, inlen, -1, 0, 0, ctx);
803 if (!ret)
804 {
805 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
806 ERR_R_NESTED_ASN1_ERROR);
807 return 0;
808 }
809 if (oclass != V_ASN1_UNIVERSAL)
810 utype = V_ASN1_OTHER;
811 }
812 if (tag == -1)
813 {
814 tag = utype;
815 aclass = V_ASN1_UNIVERSAL;
816 }
817 p = *in;
818 /* Check header */
819 ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst,
820 &p, inlen, tag, aclass, opt, ctx);
821 if (!ret)
822 {
823 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
824 return 0;
825 }
826 else if (ret == -1)
827 return -1;
828 /* SEQUENCE, SET and "OTHER" are left in encoded form */
829 if ((utype == V_ASN1_SEQUENCE)
830 || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER))
831 {
832 /* Clear context cache for type OTHER because the auto clear
833 * when we have a exact match wont work
834 */
835 if (utype == V_ASN1_OTHER)
836 {
837 asn1_tlc_clear(ctx);
838 }
839 /* SEQUENCE and SET must be constructed */
840 else if (!cst)
841 {
842 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
843 ASN1_R_TYPE_NOT_CONSTRUCTED);
844 return 0;
845 }
846
847 cont = *in;
848 /* If indefinite length constructed find the real end */
849 if (inf)
850 {
851 if (!asn1_collect(NULL, &p, plen, inf, -1, -1))
852 goto err;
853 len = p - cont;
854 }
855 else
856 {
857 len = p - cont + plen;
858 p += plen;
859 buf.data = NULL;
860 }
861 }
862 else if (cst)
863 {
864 buf.length = 0;
865 buf.max = 0;
866 buf.data = NULL;
867 /* Should really check the internal tags are correct but
868 * some things may get this wrong. The relevant specs
869 * say that constructed string types should be OCTET STRINGs
870 * internally irrespective of the type. So instead just check
871 * for UNIVERSAL class and ignore the tag.
872 */
873 if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL))
874 goto err;
875 len = buf.length;
876 /* Append a final null to string */
877 if (!BUF_MEM_grow_clean(&buf, len + 1))
878 {
879 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
880 ERR_R_MALLOC_FAILURE);
881 return 0;
882 }
883 buf.data[len] = 0;
884 cont = (const unsigned char *)buf.data;
885 free_cont = 1;
886 }
887 else
888 {
889 cont = p;
890 len = plen;
891 p += plen;
892 }
893
894 /* We now have content length and type: translate into a structure */
895 if (!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it))
896 goto err;
897
898 *in = p;
899 ret = 1;
900 err:
901 if (free_cont && buf.data) OPENSSL_free(buf.data);
902 return ret;
903 }
904
905 /* Translate ASN1 content octets into a structure */
906
907 int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
908 int utype, char *free_cont, const ASN1_ITEM *it)
909 {
910 ASN1_VALUE **opval = NULL;
911 ASN1_STRING *stmp;
912 ASN1_TYPE *typ = NULL;
913 int ret = 0;
914 const ASN1_PRIMITIVE_FUNCS *pf;
915 ASN1_INTEGER **tint;
916 pf = it->funcs;
917
918 if (pf && pf->prim_c2i)
919 return pf->prim_c2i(pval, cont, len, utype, free_cont, it);
920 /* If ANY type clear type and set pointer to internal value */
921 if (it->utype == V_ASN1_ANY)
922 {
923 if (!*pval)
924 {
925 typ = ASN1_TYPE_new();
926 *pval = (ASN1_VALUE *)typ;
927 }
928 else
929 typ = (ASN1_TYPE *)*pval;
930
931 if (utype != typ->type)
932 ASN1_TYPE_set(typ, utype, NULL);
933 opval = pval;
934 pval = (ASN1_VALUE **)&typ->value.ptr;
935 }
936 switch(utype)
937 {
938 case V_ASN1_OBJECT:
939 if (!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len))
940 goto err;
941 break;
942
943 case V_ASN1_NULL:
944 if (len)
945 {
946 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
947 ASN1_R_NULL_IS_WRONG_LENGTH);
948 goto err;
949 }
950 *pval = (ASN1_VALUE *)1;
951 break;
952
953 case V_ASN1_BOOLEAN:
954 if (len != 1)
955 {
956 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
957 ASN1_R_BOOLEAN_IS_WRONG_LENGTH);
958 goto err;
959 }
960 else
961 {
962 ASN1_BOOLEAN *tbool;
963 tbool = (ASN1_BOOLEAN *)pval;
964 *tbool = *cont;
965 }
966 break;
967
968 case V_ASN1_BIT_STRING:
969 if (!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len))
970 goto err;
971 break;
972
973 case V_ASN1_INTEGER:
974 case V_ASN1_NEG_INTEGER:
975 case V_ASN1_ENUMERATED:
976 case V_ASN1_NEG_ENUMERATED:
977 tint = (ASN1_INTEGER **)pval;
978 if (!c2i_ASN1_INTEGER(tint, &cont, len))
979 goto err;
980 /* Fixup type to match the expected form */
981 (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG);
982 break;
983
984 case V_ASN1_OCTET_STRING:
985 case V_ASN1_NUMERICSTRING:
986 case V_ASN1_PRINTABLESTRING:
987 case V_ASN1_T61STRING:
988 case V_ASN1_VIDEOTEXSTRING:
989 case V_ASN1_IA5STRING:
990 case V_ASN1_UTCTIME:
991 case V_ASN1_GENERALIZEDTIME:
992 case V_ASN1_GRAPHICSTRING:
993 case V_ASN1_VISIBLESTRING:
994 case V_ASN1_GENERALSTRING:
995 case V_ASN1_UNIVERSALSTRING:
996 case V_ASN1_BMPSTRING:
997 case V_ASN1_UTF8STRING:
998 case V_ASN1_OTHER:
999 case V_ASN1_SET:
1000 case V_ASN1_SEQUENCE:
1001 default:
1002 /* All based on ASN1_STRING and handled the same */
1003 if (!*pval)
1004 {
1005 stmp = ASN1_STRING_type_new(utype);
1006 if (!stmp)
1007 {
1008 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
1009 ERR_R_MALLOC_FAILURE);
1010 goto err;
1011 }
1012 *pval = (ASN1_VALUE *)stmp;
1013 }
1014 else
1015 {
1016 stmp = (ASN1_STRING *)*pval;
1017 stmp->type = utype;
1018 }
1019 /* If we've already allocated a buffer use it */
1020 if (*free_cont)
1021 {
1022 if (stmp->data)
1023 OPENSSL_free(stmp->data);
1024 stmp->data = (unsigned char *)cont; /* UGLY CAST! RL */
1025 stmp->length = len;
1026 *free_cont = 0;
1027 }
1028 else
1029 {
1030 if (!ASN1_STRING_set(stmp, cont, len))
1031 {
1032 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
1033 ERR_R_MALLOC_FAILURE);
1034 ASN1_STRING_free(stmp);
1035 *pval = NULL;
1036 goto err;
1037 }
1038 }
1039 break;
1040 }
1041 /* If ASN1_ANY and NULL type fix up value */
1042 if (typ && (utype == V_ASN1_NULL))
1043 typ->value.ptr = NULL;
1044
1045 ret = 1;
1046 err:
1047 if (!ret)
1048 {
1049 ASN1_TYPE_free(typ);
1050 if (opval)
1051 *opval = NULL;
1052 }
1053 return ret;
1054 }
1055
1056 /* This function collects the asn1 data from a constructred string
1057 * type into a buffer. The values of 'in' and 'len' should refer
1058 * to the contents of the constructed type and 'inf' should be set
1059 * if it is indefinite length. If 'buf' is NULL then we just want
1060 * to find the end of the current structure: useful for indefinite
1061 * length constructed stuff.
1062 */
1063
1064 static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
1065 char inf, int tag, int aclass)
1066 {
1067 const unsigned char *p, *q;
1068 long plen;
1069 char cst, ininf;
1070 p = *in;
1071 inf &= 1;
1072 /* If no buffer and not indefinite length constructed just pass over
1073 * the encoded data */
1074 if (!buf && !inf)
1075 {
1076 *in += len;
1077 return 1;
1078 }
1079 while(len > 0)
1080 {
1081 q = p;
1082 /* Check for EOC */
1083 if (asn1_check_eoc(&p, len))
1084 {
1085 /* EOC is illegal outside indefinite length
1086 * constructed form */
1087 if (!inf)
1088 {
1089 ASN1err(ASN1_F_ASN1_COLLECT,
1090 ASN1_R_UNEXPECTED_EOC);
1091 return 0;
1092 }
1093 inf = 0;
1094 break;
1095 }
1096
1097 if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p,
1098 len, tag, aclass, 0, NULL))
1099 {
1100 ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR);
1101 return 0;
1102 }
1103
1104 /* If indefinite length constructed update max length */
1105 if (cst)
1106 {
1107 if (!asn1_collect(buf, &p, plen, ininf, tag, aclass))
1108 return 0;
1109 }
1110 else if (!collect_data(buf, &p, plen))
1111 return 0;
1112 len -= p - q;
1113 }
1114 if (inf)
1115 {
1116 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC);
1117 return 0;
1118 }
1119 *in = p;
1120 return 1;
1121 }
1122
1123 static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen)
1124 {
1125 int len;
1126 if (buf)
1127 {
1128 len = buf->length;
1129 if (!BUF_MEM_grow_clean(buf, len + plen))
1130 {
1131 ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE);
1132 return 0;
1133 }
1134 memcpy(buf->data + len, *p, plen);
1135 }
1136 *p += plen;
1137 return 1;
1138 }
1139
1140 /* Check for ASN1 EOC and swallow it if found */
1141
1142 static int asn1_check_eoc(const unsigned char **in, long len)
1143 {
1144 const unsigned char *p;
1145 if (len < 2) return 0;
1146 p = *in;
1147 if (!p[0] && !p[1])
1148 {
1149 *in += 2;
1150 return 1;
1151 }
1152 return 0;
1153 }
1154
1155 /* Check an ASN1 tag and length: a bit like ASN1_get_object
1156 * but it sets the length for indefinite length constructed
1157 * form, we don't know the exact length but we can set an
1158 * upper bound to the amount of data available minus the
1159 * header length just read.
1160 */
1161
1162 static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
1163 char *inf, char *cst,
1164 const unsigned char **in, long len,
1165 int exptag, int expclass, char opt,
1166 ASN1_TLC *ctx)
1167 {
1168 int i;
1169 int ptag, pclass;
1170 long plen;
1171 const unsigned char *p, *q;
1172 p = *in;
1173 q = p;
1174
1175 if (ctx && ctx->valid)
1176 {
1177 i = ctx->ret;
1178 plen = ctx->plen;
1179 pclass = ctx->pclass;
1180 ptag = ctx->ptag;
1181 p += ctx->hdrlen;
1182 }
1183 else
1184 {
1185 i = ASN1_get_object(&p, &plen, &ptag, &pclass, len);
1186 if (ctx)
1187 {
1188 ctx->ret = i;
1189 ctx->plen = plen;
1190 ctx->pclass = pclass;
1191 ctx->ptag = ptag;
1192 ctx->hdrlen = p - q;
1193 ctx->valid = 1;
1194 /* If definite length, and no error, length +
1195 * header can't exceed total amount of data available.
1196 */
1197 if (!(i & 0x81) && ((plen + ctx->hdrlen) > len))
1198 {
1199 ASN1err(ASN1_F_ASN1_CHECK_TLEN,
1200 ASN1_R_TOO_LONG);
1201 asn1_tlc_clear(ctx);
1202 return 0;
1203 }
1204 }
1205 }
1206
1207 if (i & 0x80)
1208 {
1209 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER);
1210 asn1_tlc_clear(ctx);
1211 return 0;
1212 }
1213 if (exptag >= 0)
1214 {
1215 if ((exptag != ptag) || (expclass != pclass))
1216 {
1217 /* If type is OPTIONAL, not an error:
1218 * indicate missing type.
1219 */
1220 if (opt) return -1;
1221 asn1_tlc_clear(ctx);
1222 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG);
1223 return 0;
1224 }
1225 /* We have a tag and class match:
1226 * assume we are going to do something with it */
1227 asn1_tlc_clear(ctx);
1228 }
1229
1230 if (i & 1)
1231 plen = len - (p - q);
1232
1233 if (inf)
1234 *inf = i & 1;
1235
1236 if (cst)
1237 *cst = i & V_ASN1_CONSTRUCTED;
1238
1239 if (olen)
1240 *olen = plen;
1241
1242 if (oclass)
1243 *oclass = pclass;
1244
1245 if (otag)
1246 *otag = ptag;
1247
1248 *in = p;
1249 return 1;
1250 }
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