Tolerate a SEQUENCE in DN components.
[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) 2000-2005 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
68 static int asn1_check_eoc(const unsigned char **in, long len);
69 static int asn1_find_end(const unsigned char **in, long len, char inf);
70
71 static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
72                                 char inf, int tag, int aclass);
73
74 static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen);
75
76 static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
77                                 char *inf, char *cst,
78                                 const unsigned char **in, long len,
79                                 int exptag, int expclass, char opt,
80                                 ASN1_TLC *ctx);
81
82 static int asn1_template_ex_d2i(ASN1_VALUE **pval,
83                                 const unsigned char **in, long len,
84                                 const ASN1_TEMPLATE *tt, char opt,
85                                 ASN1_TLC *ctx);
86 static int asn1_template_noexp_d2i(ASN1_VALUE **val,
87                                 const unsigned char **in, long len,
88                                 const ASN1_TEMPLATE *tt, char opt,
89                                 ASN1_TLC *ctx);
90 static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
91                                 const unsigned char **in, long len,
92                                 const ASN1_ITEM *it,
93                                 int tag, int aclass, char opt, ASN1_TLC *ctx);
94
95 /* Table to convert tags to bit values, used for MSTRING type */
96 static unsigned long tag2bit[32] = {
97 0,      0,      0,      B_ASN1_BIT_STRING,      /* tags  0 -  3 */
98 B_ASN1_OCTET_STRING,    0,      0,              B_ASN1_UNKNOWN,/* tags  4- 7 */
99 B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,/* tags  8-11 */
100 B_ASN1_UTF8STRING,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,/* tags 12-15 */
101 B_ASN1_SEQUENCE,0,B_ASN1_NUMERICSTRING,B_ASN1_PRINTABLESTRING, /* tags 16-19 */
102 B_ASN1_T61STRING,B_ASN1_VIDEOTEXSTRING,B_ASN1_IA5STRING,       /* tags 20-22 */
103 B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME,                        /* tags 23-24 */ 
104 B_ASN1_GRAPHICSTRING,B_ASN1_ISO64STRING,B_ASN1_GENERALSTRING,  /* tags 25-27 */
105 B_ASN1_UNIVERSALSTRING,B_ASN1_UNKNOWN,B_ASN1_BMPSTRING,B_ASN1_UNKNOWN, /* tags 28-31 */
106         };
107
108 unsigned long ASN1_tag2bit(int tag)
109         {
110         if ((tag < 0) || (tag > 30)) return 0;
111         return tag2bit[tag];
112         }
113
114 /* Macro to initialize and invalidate the cache */
115
116 #define asn1_tlc_clear(c)       if (c) (c)->valid = 0
117
118 /* Decode an ASN1 item, this currently behaves just 
119  * like a standard 'd2i' function. 'in' points to 
120  * a buffer to read the data from, in future we will
121  * have more advanced versions that can input data
122  * a piece at a time and this will simply be a special
123  * case.
124  */
125
126 ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval,
127                 const unsigned char **in, long len, const ASN1_ITEM *it)
128         {
129         ASN1_TLC c;
130         ASN1_VALUE *ptmpval = NULL;
131         if (!pval)
132                 pval = &ptmpval;
133         asn1_tlc_clear(&c);
134         if (ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0) 
135                 return *pval;
136         return NULL;
137         }
138
139 int ASN1_template_d2i(ASN1_VALUE **pval,
140                 const unsigned char **in, long len, const ASN1_TEMPLATE *tt)
141         {
142         ASN1_TLC c;
143         asn1_tlc_clear(&c);
144         return asn1_template_ex_d2i(pval, in, len, tt, 0, &c);
145         }
146
147
148 /* Decode an item, taking care of IMPLICIT tagging, if any.
149  * If 'opt' set and tag mismatch return -1 to handle OPTIONAL
150  */
151
152 int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len,
153                         const ASN1_ITEM *it,
154                         int tag, int aclass, char opt, ASN1_TLC *ctx)
155         {
156         const ASN1_TEMPLATE *tt, *errtt = NULL;
157         const ASN1_COMPAT_FUNCS *cf;
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 *wp=NULL; /* BIG FAT WARNING!  BREAKS CONST WHERE USED */
163         unsigned char imphack = 0, oclass;
164         char seq_eoc, seq_nolen, cst, isopt;
165         long tmplen;
166         int i;
167         int otag;
168         int ret = 0;
169         ASN1_VALUE *pchval, **pchptr, *ptmpval;
170         if (!pval)
171                 return 0;
172         if (aux && aux->asn1_cb)
173                 asn1_cb = aux->asn1_cb;
174         else asn1_cb = 0;
175
176         switch(it->itype)
177                 {
178                 case ASN1_ITYPE_PRIMITIVE:
179                 if (it->templates)
180                         {
181                         /* tagging or OPTIONAL is currently illegal on an item
182                          * template because the flags can't get passed down.
183                          * In practice this isn't a problem: we include the
184                          * relevant flags from the item template in the
185                          * template itself.
186                          */
187                         if ((tag != -1) || opt)
188                                 {
189                                 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
190                                 ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);
191                                 goto err;
192                                 }
193                         return asn1_template_ex_d2i(pval, in, len,
194                                         it->templates, opt, ctx);
195                 }
196                 return asn1_d2i_ex_primitive(pval, in, len, it,
197                                                 tag, aclass, opt, ctx);
198                 break;
199
200                 case ASN1_ITYPE_MSTRING:
201                 p = *in;
202                 /* Just read in tag and class */
203                 ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL,
204                                                 &p, len, -1, 0, 1, ctx);
205                 if (!ret)
206                         {
207                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
208                                         ERR_R_NESTED_ASN1_ERROR);
209                         goto err;
210                         }
211
212                 /* Must be UNIVERSAL class */
213                 if (oclass != V_ASN1_UNIVERSAL)
214                         {
215                         /* If OPTIONAL, assume this is OK */
216                         if (opt) return -1;
217                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
218                                         ASN1_R_MSTRING_NOT_UNIVERSAL);
219                         goto err;
220                         }
221                 /* Check tag matches bit map */
222                 if (!(ASN1_tag2bit(otag) & it->utype))
223                         {
224                         /* If OPTIONAL, assume this is OK */
225                         if (opt)
226                                 return -1;
227                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
228                                         ASN1_R_MSTRING_WRONG_TAG);
229                         goto err;
230                         }
231                 return asn1_d2i_ex_primitive(pval, in, len,
232                                                 it, otag, 0, 0, ctx);
233
234                 case ASN1_ITYPE_EXTERN:
235                 /* Use new style d2i */
236                 ef = it->funcs;
237                 return ef->asn1_ex_d2i(pval, in, len,
238                                                 it, tag, aclass, opt, ctx);
239
240                 case ASN1_ITYPE_COMPAT:
241                 /* we must resort to old style evil hackery */
242                 cf = it->funcs;
243
244                 /* If OPTIONAL see if it is there */
245                 if (opt)
246                         {
247                         int exptag;
248                         p = *in;
249                         if (tag == -1)
250                                 exptag = it->utype;
251                         else exptag = tag;
252                         /* Don't care about anything other than presence
253                          * of expected tag */
254
255                         ret = asn1_check_tlen(NULL, NULL, NULL, NULL, NULL,
256                                         &p, len, exptag, aclass, 1, ctx);
257                         if (!ret)
258                                 {
259                                 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
260                                         ERR_R_NESTED_ASN1_ERROR);
261                                 goto err;
262                                 }
263                         if (ret == -1)
264                                 return -1;
265                         }
266
267                 /* This is the old style evil hack IMPLICIT handling:
268                  * since the underlying code is expecting a tag and
269                  * class other than the one present we change the
270                  * buffer temporarily then change it back afterwards.
271                  * This doesn't and never did work for tags > 30.
272                  *
273                  * Yes this is *horrible* but it is only needed for
274                  * old style d2i which will hopefully not be around
275                  * for much longer.
276                  * FIXME: should copy the buffer then modify it so
277                  * the input buffer can be const: we should *always*
278                  * copy because the old style d2i might modify the
279                  * buffer.
280                  */
281
282                 if (tag != -1)
283                         {
284                         wp = *(unsigned char **)in;
285                         imphack = *wp;
286                         if (p == NULL)
287                                 {
288                                 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
289                                         ERR_R_NESTED_ASN1_ERROR);
290                                 goto err;
291                                 }
292                         *wp = (unsigned char)((*p & V_ASN1_CONSTRUCTED)
293                                                                 | it->utype);
294                         }
295
296                 ptmpval = cf->asn1_d2i(pval, in, len);
297
298                 if (tag != -1)
299                         *wp = imphack;
300
301                 if (ptmpval)
302                         return 1;
303
304                 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
305                 goto err;
306
307
308                 case ASN1_ITYPE_CHOICE:
309                 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
310                                 goto auxerr;
311
312                 /* Allocate structure */
313                 if (!*pval && !ASN1_item_ex_new(pval, it))
314                         {
315                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
316                                                 ERR_R_NESTED_ASN1_ERROR);
317                         goto err;
318                         }
319                 /* CHOICE type, try each possibility in turn */
320                 pchval = NULL;
321                 p = *in;
322                 for (i = 0, tt=it->templates; i < it->tcount; i++, tt++)
323                         {
324                         pchptr = asn1_get_field_ptr(pval, tt);
325                         /* We mark field as OPTIONAL so its absence
326                          * can be recognised.
327                          */
328                         ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx);
329                         /* If field not present, try the next one */
330                         if (ret == -1)
331                                 continue;
332                         /* If positive return, read OK, break loop */
333                         if (ret > 0)
334                                 break;
335                         /* Otherwise must be an ASN1 parsing error */
336                         errtt = tt;
337                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
338                                                 ERR_R_NESTED_ASN1_ERROR);
339                         goto err;
340                         }
341
342                 /* Did we fall off the end without reading anything? */
343                 if (i == it->tcount)
344                         {
345                         /* If OPTIONAL, this is OK */
346                         if (opt)
347                                 {
348                                 /* Free and zero it */
349                                 ASN1_item_ex_free(pval, it);
350                                 return -1;
351                                 }
352                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
353                                         ASN1_R_NO_MATCHING_CHOICE_TYPE);
354                         goto err;
355                         }
356
357                 asn1_set_choice_selector(pval, i, it);
358                 *in = p;
359                 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
360                                 goto auxerr;
361                 return 1;
362
363                 case ASN1_ITYPE_NDEF_SEQUENCE:
364                 case ASN1_ITYPE_SEQUENCE:
365                 p = *in;
366                 tmplen = len;
367
368                 /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
369                 if (tag == -1)
370                         {
371                         tag = V_ASN1_SEQUENCE;
372                         aclass = V_ASN1_UNIVERSAL;
373                         }
374                 /* Get SEQUENCE length and update len, p */
375                 ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst,
376                                         &p, len, tag, aclass, opt, ctx);
377                 if (!ret)
378                         {
379                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
380                                         ERR_R_NESTED_ASN1_ERROR);
381                         goto err;
382                         }
383                 else if (ret == -1)
384                         return -1;
385                 if (aux && (aux->flags & ASN1_AFLG_BROKEN))
386                         {
387                         len = tmplen - (p - *in);
388                         seq_nolen = 1;
389                         }
390                 /* If indefinite we don't do a length check */
391                 else seq_nolen = seq_eoc;
392                 if (!cst)
393                         {
394                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
395                                 ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
396                         goto err;
397                         }
398
399                 if (!*pval && !ASN1_item_ex_new(pval, it))
400                         {
401                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
402                                 ERR_R_NESTED_ASN1_ERROR);
403                         goto err;
404                         }
405
406                 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
407                                 goto auxerr;
408
409                 /* Get each field entry */
410                 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++)
411                         {
412                         const ASN1_TEMPLATE *seqtt;
413                         ASN1_VALUE **pseqval;
414                         seqtt = asn1_do_adb(pval, tt, 1);
415                         if (!seqtt)
416                                 goto err;
417                         pseqval = asn1_get_field_ptr(pval, seqtt);
418                         /* Have we ran out of data? */
419                         if (!len)
420                                 break;
421                         q = p;
422                         if (asn1_check_eoc(&p, len))
423                                 {
424                                 if (!seq_eoc)
425                                         {
426                                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
427                                                         ASN1_R_UNEXPECTED_EOC);
428                                         goto err;
429                                         }
430                                 len -= p - q;
431                                 seq_eoc = 0;
432                                 q = p;
433                                 break;
434                                 }
435                         /* This determines the OPTIONAL flag value. The field
436                          * cannot be omitted if it is the last of a SEQUENCE
437                          * and there is still data to be read. This isn't
438                          * strictly necessary but it increases efficiency in
439                          * some cases.
440                          */
441                         if (i == (it->tcount - 1))
442                                 isopt = 0;
443                         else isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
444                         /* attempt to read in field, allowing each to be
445                          * OPTIONAL */
446
447                         ret = asn1_template_ex_d2i(pseqval, &p, len,
448                                                         seqtt, isopt, ctx);
449                         if (!ret)
450                                 {
451                                 errtt = seqtt;
452                                 goto err;
453                                 }
454                         else if (ret == -1)
455                                 {
456                                 /* OPTIONAL component absent.
457                                  * Free and zero the field.
458                                  */
459                                 ASN1_template_free(pseqval, seqtt);
460                                 continue;
461                                 }
462                         /* Update length */
463                         len -= p - q;
464                         }
465
466                 /* Check for EOC if expecting one */
467                 if (seq_eoc && !asn1_check_eoc(&p, len))
468                         {
469                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MISSING_EOC);
470                         goto err;
471                         }
472                 /* Check all data read */
473                 if (!seq_nolen && len)
474                         {
475                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
476                                         ASN1_R_SEQUENCE_LENGTH_MISMATCH);
477                         goto err;
478                         }
479
480                 /* If we get here we've got no more data in the SEQUENCE,
481                  * however we may not have read all fields so check all
482                  * remaining are OPTIONAL and clear any that are.
483                  */
484                 for (; i < it->tcount; tt++, i++)
485                         {
486                         const ASN1_TEMPLATE *seqtt;
487                         seqtt = asn1_do_adb(pval, tt, 1);
488                         if (!seqtt)
489                                 goto err;
490                         if (seqtt->flags & ASN1_TFLG_OPTIONAL)
491                                 {
492                                 ASN1_VALUE **pseqval;
493                                 pseqval = asn1_get_field_ptr(pval, seqtt);
494                                 ASN1_template_free(pseqval, seqtt);
495                                 }
496                         else
497                                 {
498                                 errtt = seqtt;
499                                 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
500                                                         ASN1_R_FIELD_MISSING);
501                                 goto err;
502                                 }
503                         }
504                 /* Save encoding */
505                 if (!asn1_enc_save(pval, *in, p - *in, it))
506                         goto auxerr;
507                 *in = p;
508                 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
509                                 goto auxerr;
510                 return 1;
511
512                 default:
513                 return 0;
514                 }
515         auxerr:
516         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_AUX_ERROR);
517         err:
518         ASN1_item_ex_free(pval, it);
519         if (errtt)
520                 ERR_add_error_data(4, "Field=", errtt->field_name,
521                                         ", Type=", it->sname);
522         else
523                 ERR_add_error_data(2, "Type=", it->sname);
524         return 0;
525         }
526
527 /* Templates are handled with two separate functions.
528  * One handles any EXPLICIT tag and the other handles the rest.
529  */
530
531 static int asn1_template_ex_d2i(ASN1_VALUE **val,
532                                 const unsigned char **in, long inlen,
533                                 const ASN1_TEMPLATE *tt, char opt,
534                                                         ASN1_TLC *ctx)
535         {
536         int flags, aclass;
537         int ret;
538         long len;
539         const unsigned char *p, *q;
540         char exp_eoc;
541         if (!val)
542                 return 0;
543         flags = tt->flags;
544         aclass = flags & ASN1_TFLG_TAG_CLASS;
545
546         p = *in;
547
548         /* Check if EXPLICIT tag expected */
549         if (flags & ASN1_TFLG_EXPTAG)
550                 {
551                 char cst;
552                 /* Need to work out amount of data available to the inner
553                  * content and where it starts: so read in EXPLICIT header to
554                  * get the info.
555                  */
556                 ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst,
557                                         &p, inlen, tt->tag, aclass, opt, ctx);
558                 q = p;
559                 if (!ret)
560                         {
561                         ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
562                                         ERR_R_NESTED_ASN1_ERROR);
563                         return 0;
564                         }
565                 else if (ret == -1)
566                         return -1;
567                 if (!cst)
568                         {
569                         ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
570                                         ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);
571                         return 0;
572                         }
573                 /* We've found the field so it can't be OPTIONAL now */
574                 ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx);
575                 if (!ret)
576                         {
577                         ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
578                                         ERR_R_NESTED_ASN1_ERROR);
579                         return 0;
580                         }
581                 /* We read the field in OK so update length */
582                 len -= p - q;
583                 if (exp_eoc)
584                         {
585                         /* If NDEF we must have an EOC here */
586                         if (!asn1_check_eoc(&p, len))
587                                 {
588                                 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
589                                                 ASN1_R_MISSING_EOC);
590                                 goto err;
591                                 }
592                         }
593                 else
594                         {
595                         /* Otherwise we must hit the EXPLICIT tag end or its
596                          * an error */
597                         if (len)
598                                 {
599                                 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
600                                         ASN1_R_EXPLICIT_LENGTH_MISMATCH);
601                                 goto err;
602                                 }
603                         }
604                 }
605                 else 
606                         return asn1_template_noexp_d2i(val, in, inlen,
607                                                                 tt, opt, ctx);
608
609         *in = p;
610         return 1;
611
612         err:
613         ASN1_template_free(val, tt);
614         *val = NULL;
615         return 0;
616         }
617
618 static int asn1_template_noexp_d2i(ASN1_VALUE **val,
619                                 const unsigned char **in, long len,
620                                 const ASN1_TEMPLATE *tt, char opt,
621                                 ASN1_TLC *ctx)
622         {
623         int flags, aclass;
624         int ret;
625         const unsigned char *p, *q;
626         if (!val)
627                 return 0;
628         flags = tt->flags;
629         aclass = flags & ASN1_TFLG_TAG_CLASS;
630
631         p = *in;
632         q = p;
633
634         if (flags & ASN1_TFLG_SK_MASK)
635                 {
636                 /* SET OF, SEQUENCE OF */
637                 int sktag, skaclass;
638                 char sk_eoc;
639                 /* First work out expected inner tag value */
640                 if (flags & ASN1_TFLG_IMPTAG)
641                         {
642                         sktag = tt->tag;
643                         skaclass = aclass;
644                         }
645                 else
646                         {
647                         skaclass = V_ASN1_UNIVERSAL;
648                         if (flags & ASN1_TFLG_SET_OF)
649                                 sktag = V_ASN1_SET;
650                         else
651                                 sktag = V_ASN1_SEQUENCE;
652                         }
653                 /* Get the tag */
654                 ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL,
655                                         &p, len, sktag, skaclass, opt, ctx);
656                 if (!ret)
657                         {
658                         ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
659                                                 ERR_R_NESTED_ASN1_ERROR);
660                         return 0;
661                         }
662                 else if (ret == -1)
663                         return -1;
664                 if (!*val)
665                         *val = (ASN1_VALUE *)sk_new_null();
666                 else
667                         {
668                         /* We've got a valid STACK: free up any items present */
669                         STACK *sktmp = (STACK *)*val;
670                         ASN1_VALUE *vtmp;
671                         while(sk_num(sktmp) > 0)
672                                 {
673                                 vtmp = (ASN1_VALUE *)sk_pop(sktmp);
674                                 ASN1_item_ex_free(&vtmp,
675                                                 ASN1_ITEM_ptr(tt->item));
676                                 }
677                         }
678                                 
679                 if (!*val)
680                         {
681                         ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
682                                                 ERR_R_MALLOC_FAILURE);
683                         goto err;
684                         }
685
686                 /* Read as many items as we can */
687                 while(len > 0)
688                         {
689                         ASN1_VALUE *skfield;
690                         q = p;
691                         /* See if EOC found */
692                         if (asn1_check_eoc(&p, len))
693                                 {
694                                 if (!sk_eoc)
695                                         {
696                                         ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
697                                                         ASN1_R_UNEXPECTED_EOC);
698                                         goto err;
699                                         }
700                                 len -= p - q;
701                                 sk_eoc = 0;
702                                 break;
703                                 }
704                         skfield = NULL;
705                         if (!ASN1_item_ex_d2i(&skfield, &p, len,
706                                                 ASN1_ITEM_ptr(tt->item),
707                                                 -1, 0, 0, ctx))
708                                 {
709                                 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
710                                         ERR_R_NESTED_ASN1_ERROR);
711                                 goto err;
712                                 }
713                         len -= p - q;
714                         if (!sk_push((STACK *)*val, (char *)skfield))
715                                 {
716                                 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
717                                                 ERR_R_MALLOC_FAILURE);
718                                 goto err;
719                                 }
720                         }
721                 if (sk_eoc)
722                         {
723                         ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ASN1_R_MISSING_EOC);
724                         goto err;
725                         }
726                 }
727         else if (flags & ASN1_TFLG_IMPTAG)
728                 {
729                 /* IMPLICIT tagging */
730                 ret = ASN1_item_ex_d2i(val, &p, len,
731                         ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt, ctx);
732                 if (!ret)
733                         {
734                         ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
735                                                 ERR_R_NESTED_ASN1_ERROR);
736                         goto err;
737                         }
738                 else if (ret == -1)
739                         return -1;
740                 }
741         else
742                 {
743                 /* Nothing special */
744                 ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item),
745                                                         -1, 0, opt, ctx);
746                 if (!ret)
747                         {
748                         ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
749                                         ERR_R_NESTED_ASN1_ERROR);
750                         goto err;
751                         }
752                 else if (ret == -1)
753                         return -1;
754                 }
755
756         *in = p;
757         return 1;
758
759         err:
760         ASN1_template_free(val, tt);
761         *val = NULL;
762         return 0;
763         }
764
765 static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
766                                 const unsigned char **in, long inlen, 
767                                 const ASN1_ITEM *it,
768                                 int tag, int aclass, char opt, ASN1_TLC *ctx)
769         {
770         int ret = 0, utype;
771         long plen;
772         char cst, inf, free_cont = 0;
773         const unsigned char *p;
774         BUF_MEM buf;
775         const unsigned char *cont = NULL;
776         long len; 
777         if (!pval)
778                 {
779                 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL);
780                 return 0; /* Should never happen */
781                 }
782
783         if (it->itype == ASN1_ITYPE_MSTRING)
784                 {
785                 utype = tag;
786                 tag = -1;
787                 }
788         else
789                 utype = it->utype;
790
791         if (utype == V_ASN1_ANY)
792                 {
793                 /* If type is ANY need to figure out type from tag */
794                 unsigned char oclass;
795                 if (tag >= 0)
796                         {
797                         ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
798                                         ASN1_R_ILLEGAL_TAGGED_ANY);
799                         return 0;
800                         }
801                 if (opt)
802                         {
803                         ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
804                                         ASN1_R_ILLEGAL_OPTIONAL_ANY);
805                         return 0;
806                         }
807                 p = *in;
808                 ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL,
809                                         &p, inlen, -1, 0, 0, ctx);
810                 if (!ret)
811                         {
812                         ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
813                                         ERR_R_NESTED_ASN1_ERROR);
814                         return 0;
815                         }
816                 if (oclass != V_ASN1_UNIVERSAL)
817                         utype = V_ASN1_OTHER;
818                 }
819         if (tag == -1)
820                 {
821                 tag = utype;
822                 aclass = V_ASN1_UNIVERSAL;
823                 }
824         p = *in;
825         /* Check header */
826         ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst,
827                                 &p, inlen, tag, aclass, opt, ctx);
828         if (!ret)
829                 {
830                 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
831                 return 0;
832                 }
833         else if (ret == -1)
834                 return -1;
835         /* SEQUENCE, SET and "OTHER" are left in encoded form */
836         if ((utype == V_ASN1_SEQUENCE)
837                 || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER))
838                 {
839                 /* Clear context cache for type OTHER because the auto clear
840                  * when we have a exact match wont work
841                  */
842                 if (utype == V_ASN1_OTHER)
843                         {
844                         asn1_tlc_clear(ctx);
845                         }
846                 /* SEQUENCE and SET must be constructed */
847                 else if (!cst)
848                         {
849                         ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
850                                 ASN1_R_TYPE_NOT_CONSTRUCTED);
851                         return 0;
852                         }
853
854                 cont = *in;
855                 /* If indefinite length constructed find the real end */
856                 if (inf)
857                         {
858                         if (!asn1_find_end(&p, plen, inf))
859                                  goto err;
860                         len = p - cont;
861                         }
862                 else
863                         {
864                         len = p - cont + plen;
865                         p += plen;
866                         buf.data = NULL;
867                         }
868                 }
869         else if (cst)
870                 {
871                 buf.length = 0;
872                 buf.max = 0;
873                 buf.data = NULL;
874                 /* Should really check the internal tags are correct but
875                  * some things may get this wrong. The relevant specs
876                  * say that constructed string types should be OCTET STRINGs
877                  * internally irrespective of the type. So instead just check
878                  * for UNIVERSAL class and ignore the tag.
879                  */
880                 if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL))
881                         goto err;
882                 len = buf.length;
883                 /* Append a final null to string */
884                 if (!BUF_MEM_grow_clean(&buf, len + 1))
885                         {
886                         ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
887                                                 ERR_R_MALLOC_FAILURE);
888                         return 0;
889                         }
890                 buf.data[len] = 0;
891                 cont = (const unsigned char *)buf.data;
892                 free_cont = 1;
893                 }
894         else
895                 {
896                 cont = p;
897                 len = plen;
898                 p += plen;
899                 }
900
901         /* We now have content length and type: translate into a structure */
902         if (!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it))
903                 goto err;
904
905         *in = p;
906         ret = 1;
907         err:
908         if (free_cont && buf.data) OPENSSL_free(buf.data);
909         return ret;
910         }
911
912 /* Translate ASN1 content octets into a structure */
913
914 int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
915                         int utype, char *free_cont, const ASN1_ITEM *it)
916         {
917         ASN1_VALUE **opval = NULL;
918         ASN1_STRING *stmp;
919         ASN1_TYPE *typ = NULL;
920         int ret = 0;
921         const ASN1_PRIMITIVE_FUNCS *pf;
922         ASN1_INTEGER **tint;
923         pf = it->funcs;
924
925         if (pf && pf->prim_c2i)
926                 return pf->prim_c2i(pval, cont, len, utype, free_cont, it);
927         /* If ANY type clear type and set pointer to internal value */
928         if (it->utype == V_ASN1_ANY)
929                 {
930                 if (!*pval)
931                         {
932                         typ = ASN1_TYPE_new();
933                         if (typ == NULL)
934                                 goto err;
935                         *pval = (ASN1_VALUE *)typ;
936                         }
937                 else
938                         typ = (ASN1_TYPE *)*pval;
939
940                 if (utype != typ->type)
941                         ASN1_TYPE_set(typ, utype, NULL);
942                 opval = pval;
943                 pval = (ASN1_VALUE **)&typ->value.ptr;
944                 }
945         switch(utype)
946                 {
947                 case V_ASN1_OBJECT:
948                 if (!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len))
949                         goto err;
950                 break;
951
952                 case V_ASN1_NULL:
953                 if (len)
954                         {
955                         ASN1err(ASN1_F_ASN1_EX_C2I,
956                                                 ASN1_R_NULL_IS_WRONG_LENGTH);
957                         goto err;
958                         }
959                 *pval = (ASN1_VALUE *)1;
960                 break;
961
962                 case V_ASN1_BOOLEAN:
963                 if (len != 1)
964                         {
965                         ASN1err(ASN1_F_ASN1_EX_C2I,
966                                                 ASN1_R_BOOLEAN_IS_WRONG_LENGTH);
967                         goto err;
968                         }
969                 else
970                         {
971                         ASN1_BOOLEAN *tbool;
972                         tbool = (ASN1_BOOLEAN *)pval;
973                         *tbool = *cont;
974                         }
975                 break;
976
977                 case V_ASN1_BIT_STRING:
978                 if (!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len))
979                         goto err;
980                 break;
981
982                 case V_ASN1_INTEGER:
983                 case V_ASN1_NEG_INTEGER:
984                 case V_ASN1_ENUMERATED:
985                 case V_ASN1_NEG_ENUMERATED:
986                 tint = (ASN1_INTEGER **)pval;
987                 if (!c2i_ASN1_INTEGER(tint, &cont, len))
988                         goto err;
989                 /* Fixup type to match the expected form */
990                 (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG);
991                 break;
992
993                 case V_ASN1_OCTET_STRING:
994                 case V_ASN1_NUMERICSTRING:
995                 case V_ASN1_PRINTABLESTRING:
996                 case V_ASN1_T61STRING:
997                 case V_ASN1_VIDEOTEXSTRING:
998                 case V_ASN1_IA5STRING:
999                 case V_ASN1_UTCTIME:
1000                 case V_ASN1_GENERALIZEDTIME:
1001                 case V_ASN1_GRAPHICSTRING:
1002                 case V_ASN1_VISIBLESTRING:
1003                 case V_ASN1_GENERALSTRING:
1004                 case V_ASN1_UNIVERSALSTRING:
1005                 case V_ASN1_BMPSTRING:
1006                 case V_ASN1_UTF8STRING:
1007                 case V_ASN1_OTHER:
1008                 case V_ASN1_SET:
1009                 case V_ASN1_SEQUENCE:
1010                 default:
1011                 /* All based on ASN1_STRING and handled the same */
1012                 if (!*pval)
1013                         {
1014                         stmp = ASN1_STRING_type_new(utype);
1015                         if (!stmp)
1016                                 {
1017                                 ASN1err(ASN1_F_ASN1_EX_C2I,
1018                                                         ERR_R_MALLOC_FAILURE);
1019                                 goto err;
1020                                 }
1021                         *pval = (ASN1_VALUE *)stmp;
1022                         }
1023                 else
1024                         {
1025                         stmp = (ASN1_STRING *)*pval;
1026                         stmp->type = utype;
1027                         }
1028                 /* If we've already allocated a buffer use it */
1029                 if (*free_cont)
1030                         {
1031                         if (stmp->data)
1032                                 OPENSSL_free(stmp->data);
1033                         stmp->data = (unsigned char *)cont; /* UGLY CAST! RL */
1034                         stmp->length = len;
1035                         *free_cont = 0;
1036                         }
1037                 else
1038                         {
1039                         if (!ASN1_STRING_set(stmp, cont, len))
1040                                 {
1041                                 ASN1err(ASN1_F_ASN1_EX_C2I,
1042                                                         ERR_R_MALLOC_FAILURE);
1043                                 ASN1_STRING_free(stmp); 
1044                                 *pval = NULL;
1045                                 goto err;
1046                                 }
1047                         }
1048                 break;
1049                 }
1050         /* If ASN1_ANY and NULL type fix up value */
1051         if (typ && (utype == V_ASN1_NULL))
1052                  typ->value.ptr = NULL;
1053
1054         ret = 1;
1055         err:
1056         if (!ret)
1057                 {
1058                 ASN1_TYPE_free(typ);
1059                 if (opval)
1060                         *opval = NULL;
1061                 }
1062         return ret;
1063         }
1064
1065
1066 /* This function finds the end of an ASN1 structure when passed its maximum
1067  * length, whether it is indefinite length and a pointer to the content.
1068  * This is more efficient than calling asn1_collect because it does not
1069  * recurse on each indefinite length header.
1070  */
1071
1072 static int asn1_find_end(const unsigned char **in, long len, char inf)
1073         {
1074         int expected_eoc;
1075         long plen;
1076         const unsigned char *p = *in, *q;
1077         /* If not indefinite length constructed just add length */
1078         if (inf == 0)
1079                 {
1080                 *in += len;
1081                 return 1;
1082                 }
1083         expected_eoc = 1;
1084         /* Indefinite length constructed form. Find the end when enough EOCs
1085          * are found. If more indefinite length constructed headers
1086          * are encountered increment the expected eoc count otherwise just
1087          * skip to the end of the data.
1088          */
1089         while (len > 0)
1090                 {
1091                 if(asn1_check_eoc(&p, len))
1092                         {
1093                         expected_eoc--;
1094                         if (expected_eoc == 0)
1095                                 break;
1096                         len -= 2;
1097                         continue;
1098                         }
1099                 q = p;
1100                 /* Just read in a header: only care about the length */
1101                 if(!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len,
1102                                 -1, 0, 0, NULL))
1103                         {
1104                         ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR);
1105                         return 0;
1106                         }
1107                 if (inf)
1108                         expected_eoc++;
1109                 else
1110                         p += plen;
1111                 len -= p - q;
1112                 }
1113         if (expected_eoc)
1114                 {
1115                 ASN1err(ASN1_F_ASN1_FIND_END, ASN1_R_MISSING_EOC);
1116                 return 0;
1117                 }
1118         *in = p;
1119         return 1;
1120         }
1121 /* This function collects the asn1 data from a constructred string
1122  * type into a buffer. The values of 'in' and 'len' should refer
1123  * to the contents of the constructed type and 'inf' should be set
1124  * if it is indefinite length.
1125  */
1126
1127 static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
1128                                 char inf, int tag, int aclass)
1129         {
1130         const unsigned char *p, *q;
1131         long plen;
1132         char cst, ininf;
1133         p = *in;
1134         inf &= 1;
1135         /* If no buffer and not indefinite length constructed just pass over
1136          * the encoded data */
1137         if (!buf && !inf)
1138                 {
1139                 *in += len;
1140                 return 1;
1141                 }
1142         while(len > 0)
1143                 {
1144                 q = p;
1145                 /* Check for EOC */
1146                 if (asn1_check_eoc(&p, len))
1147                         {
1148                         /* EOC is illegal outside indefinite length
1149                          * constructed form */
1150                         if (!inf)
1151                                 {
1152                                 ASN1err(ASN1_F_ASN1_COLLECT,
1153                                         ASN1_R_UNEXPECTED_EOC);
1154                                 return 0;
1155                                 }
1156                         inf = 0;
1157                         break;
1158                         }
1159
1160                 if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p,
1161                                         len, tag, aclass, 0, NULL))
1162                         {
1163                         ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR);
1164                         return 0;
1165                         }
1166
1167                 /* If indefinite length constructed update max length */
1168                 if (cst)
1169                         {
1170 #ifdef OPENSSL_ALLOW_NESTED_ASN1_STRINGS
1171                         if (!asn1_collect(buf, &p, plen, ininf, tag, aclass))
1172                                 return 0;
1173 #else
1174                         ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_NESTED_ASN1_STRING);
1175                         return 0;
1176 #endif
1177                         }
1178                 else if (plen && !collect_data(buf, &p, plen))
1179                         return 0;
1180                 len -= p - q;
1181                 }
1182         if (inf)
1183                 {
1184                 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC);
1185                 return 0;
1186                 }
1187         *in = p;
1188         return 1;
1189         }
1190
1191 static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen)
1192         {
1193         int len;
1194         if (buf)
1195                 {
1196                 len = buf->length;
1197                 if (!BUF_MEM_grow_clean(buf, len + plen))
1198                         {
1199                         ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE);
1200                         return 0;
1201                         }
1202                 memcpy(buf->data + len, *p, plen);
1203                 }
1204         *p += plen;
1205         return 1;
1206         }
1207
1208 /* Check for ASN1 EOC and swallow it if found */
1209
1210 static int asn1_check_eoc(const unsigned char **in, long len)
1211         {
1212         const unsigned char *p;
1213         if (len < 2) return 0;
1214         p = *in;
1215         if (!p[0] && !p[1])
1216                 {
1217                 *in += 2;
1218                 return 1;
1219                 }
1220         return 0;
1221         }
1222
1223 /* Check an ASN1 tag and length: a bit like ASN1_get_object
1224  * but it sets the length for indefinite length constructed
1225  * form, we don't know the exact length but we can set an
1226  * upper bound to the amount of data available minus the
1227  * header length just read.
1228  */
1229
1230 static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
1231                                 char *inf, char *cst,
1232                                 const unsigned char **in, long len,
1233                                 int exptag, int expclass, char opt,
1234                                 ASN1_TLC *ctx)
1235         {
1236         int i;
1237         int ptag, pclass;
1238         long plen;
1239         const unsigned char *p, *q;
1240         p = *in;
1241         q = p;
1242
1243         if (ctx && ctx->valid)
1244                 {
1245                 i = ctx->ret;
1246                 plen = ctx->plen;
1247                 pclass = ctx->pclass;
1248                 ptag = ctx->ptag;
1249                 p += ctx->hdrlen;
1250                 }
1251         else
1252                 {
1253                 i = ASN1_get_object(&p, &plen, &ptag, &pclass, len);
1254                 if (ctx)
1255                         {
1256                         ctx->ret = i;
1257                         ctx->plen = plen;
1258                         ctx->pclass = pclass;
1259                         ctx->ptag = ptag;
1260                         ctx->hdrlen = p - q;
1261                         ctx->valid = 1;
1262                         /* If definite length, and no error, length +
1263                          * header can't exceed total amount of data available. 
1264                          */
1265                         if (!(i & 0x81) && ((plen + ctx->hdrlen) > len))
1266                                 {
1267                                 ASN1err(ASN1_F_ASN1_CHECK_TLEN,
1268                                                         ASN1_R_TOO_LONG);
1269                                 asn1_tlc_clear(ctx);
1270                                 return 0;
1271                                 }
1272                         }
1273                 }
1274
1275         if (i & 0x80)
1276                 {
1277                 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER);
1278                 asn1_tlc_clear(ctx);
1279                 return 0;
1280                 }
1281         if (exptag >= 0)
1282                 {
1283                 if ((exptag != ptag) || (expclass != pclass))
1284                         {
1285                         /* If type is OPTIONAL, not an error:
1286                          * indicate missing type.
1287                          */
1288                         if (opt) return -1;
1289                         asn1_tlc_clear(ctx);
1290                         ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG);
1291                         return 0;
1292                         }
1293                 /* We have a tag and class match:
1294                  * assume we are going to do something with it */
1295                 asn1_tlc_clear(ctx);
1296                 }
1297
1298         if (i & 1)
1299                 plen = len - (p - q);
1300
1301         if (inf)
1302                 *inf = i & 1;
1303
1304         if (cst)
1305                 *cst = i & V_ASN1_CONSTRUCTED;
1306
1307         if (olen)
1308                 *olen = plen;
1309
1310         if (oclass)
1311                 *oclass = pclass;
1312
1313         if (otag)
1314                 *otag = ptag;
1315
1316         *in = p;
1317         return 1;
1318         }