2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 2000 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
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>
68 static int asn1_check_eoc(unsigned char **in
, long len
);
69 static int asn1_collect(BUF_MEM
*buf
, unsigned char **in
, long len
, char inf
, int tag
, int aclass
);
70 static int collect_data(BUF_MEM
*buf
, unsigned char **p
, long plen
);
71 static int asn1_check_tlen(long *olen
, int *otag
, unsigned char *oclass
, char *inf
, char *cst
,
72 unsigned char **in
, long len
, int exptag
, int expclass
, char opt
, ASN1_TLC
*ctx
);
73 static int asn1_template_ex_d2i(ASN1_VALUE
**pval
, unsigned char **in
, long len
, const ASN1_TEMPLATE
*tt
, char opt
, ASN1_TLC
*ctx
);
74 static int asn1_template_noexp_d2i(ASN1_VALUE
**val
, unsigned char **in
, long len
, const ASN1_TEMPLATE
*tt
, char opt
, ASN1_TLC
*ctx
);
75 static int asn1_d2i_ex_primitive(ASN1_VALUE
**pval
, unsigned char **in
, long len
,
76 const ASN1_ITEM
*it
, int tag
, int aclass
, char opt
, ASN1_TLC
*ctx
);
78 /* Macro to initialize and invalidate the cache */
80 #define asn1_tlc_clear(c) if(c) (c)->valid = 0
82 /* Decode an ASN1 item, this currently behaves just
83 * like a standard 'd2i' function. 'in' points to
84 * a buffer to read the data from, in future we will
85 * have more advanced versions that can input data
86 * a piece at a time and this will simply be a special
90 ASN1_VALUE
*ASN1_item_d2i(ASN1_VALUE
**pval
, unsigned char **in
, long len
, const ASN1_ITEM
*it
)
93 ASN1_VALUE
*ptmpval
= NULL
;
94 if(!pval
) pval
= &ptmpval
;
96 if(ASN1_item_ex_d2i(pval
, in
, len
, it
, -1, 0, 0, &c
) > 0)
101 int ASN1_template_d2i(ASN1_VALUE
**pval
, unsigned char **in
, long len
, const ASN1_TEMPLATE
*tt
)
105 return asn1_template_ex_d2i(pval
, in
, len
, tt
, 0, &c
);
109 /* Decode an item, taking care of IMPLICIT tagging, if any.
110 * If 'opt' set and tag mismatch return -1 to handle OPTIONAL
113 int ASN1_item_ex_d2i(ASN1_VALUE
**pval
, unsigned char **in
, long len
, const ASN1_ITEM
*it
,
114 int tag
, int aclass
, char opt
, ASN1_TLC
*ctx
)
116 const ASN1_TEMPLATE
*tt
, *errtt
= NULL
;
117 const ASN1_COMPAT_FUNCS
*cf
;
118 const ASN1_EXTERN_FUNCS
*ef
;
119 const ASN1_AUX
*aux
= it
->funcs
;
120 ASN1_aux_cb
*asn1_cb
;
121 unsigned char *p
, *q
, imphack
= 0, oclass
;
122 char seq_eoc
, seq_nolen
, cst
, isopt
;
127 ASN1_VALUE
*pchval
, **pchptr
, *ptmpval
;
129 if(aux
&& aux
->asn1_cb
) asn1_cb
= aux
->asn1_cb
;
134 case ASN1_ITYPE_PRIMITIVE
:
136 /* tagging or OPTIONAL is currently illegal on an item template
137 * because the flags can't get passed down. In practice this isn't
138 * a problem: we include the relevant flags from the item template
139 * in the template itself.
141 if ((tag
!= -1) || opt
) {
142 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I
, ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE
);
145 return asn1_template_ex_d2i(pval
, in
, len
, it
->templates
, opt
, ctx
);
147 return asn1_d2i_ex_primitive(pval
, in
, len
, it
, tag
, aclass
, opt
, ctx
);
150 case ASN1_ITYPE_MSTRING
:
152 /* Just read in tag and class */
153 ret
= asn1_check_tlen(NULL
, &otag
, &oclass
, NULL
, NULL
, &p
, len
, -1, 0, 1, ctx
);
155 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I
, ERR_R_NESTED_ASN1_ERROR
);
158 /* Must be UNIVERSAL class */
159 if(oclass
!= V_ASN1_UNIVERSAL
) {
160 /* If OPTIONAL, assume this is OK */
162 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I
, ASN1_R_MSTRING_NOT_UNIVERSAL
);
165 /* Check tag matches bit map */
166 if(!(ASN1_tag2bit(otag
) & it
->utype
)) {
167 /* If OPTIONAL, assume this is OK */
169 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I
, ASN1_R_MSTRING_WRONG_TAG
);
172 return asn1_d2i_ex_primitive(pval
, in
, len
, it
, otag
, 0, 0, ctx
);
174 case ASN1_ITYPE_EXTERN
:
175 /* Use new style d2i */
177 return ef
->asn1_ex_d2i(pval
, in
, len
, it
, tag
, aclass
, opt
, ctx
);
179 case ASN1_ITYPE_COMPAT
:
180 /* we must resort to old style evil hackery */
183 /* If OPTIONAL see if it is there */
187 if(tag
== -1) exptag
= it
->utype
;
189 /* Don't care about anything other than presence of expected tag */
190 ret
= asn1_check_tlen(NULL
, NULL
, NULL
, NULL
, NULL
, &p
, len
, exptag
, aclass
, 1, ctx
);
192 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I
, ERR_R_NESTED_ASN1_ERROR
);
195 if(ret
== -1) return -1;
197 /* This is the old style evil hack IMPLICIT handling:
198 * since the underlying code is expecting a tag and
199 * class other than the one present we change the
200 * buffer temporarily then change it back afterwards.
201 * This doesn't and never did work for tags > 30.
203 * Yes this is *horrible* but it is only needed for
204 * old style d2i which will hopefully not be around
206 * FIXME: should copy the buffer then modify it so
207 * the input buffer can be const: we should *always*
208 * copy because the old style d2i might modify the
215 *p
= (unsigned char)((*p
& V_ASN1_CONSTRUCTED
) | it
->utype
);
218 ptmpval
= cf
->asn1_d2i(pval
, in
, len
);
220 if(tag
!= -1) *p
= imphack
;
222 if(ptmpval
) return 1;
223 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I
, ERR_R_NESTED_ASN1_ERROR
);
227 case ASN1_ITYPE_CHOICE
:
228 if(asn1_cb
&& !asn1_cb(ASN1_OP_D2I_PRE
, pval
, it
))
231 /* Allocate structure */
233 if(!ASN1_item_ex_new(pval
, it
)) {
234 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I
, ERR_R_NESTED_ASN1_ERROR
);
238 /* CHOICE type, try each possibility in turn */
241 for(i
= 0, tt
=it
->templates
; i
< it
->tcount
; i
++, tt
++) {
242 pchptr
= asn1_get_field_ptr(pval
, tt
);
243 /* We mark field as OPTIONAL so its absence
246 ret
= asn1_template_ex_d2i(pchptr
, &p
, len
, tt
, 1, ctx
);
247 /* If field not present, try the next one */
248 if(ret
== -1) continue;
249 /* If positive return, read OK, break loop */
251 /* Otherwise must be an ASN1 parsing error */
253 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I
, ERR_R_NESTED_ASN1_ERROR
);
256 /* Did we fall off the end without reading anything? */
257 if(i
== it
->tcount
) {
258 /* If OPTIONAL, this is OK */
260 /* Free and zero it */
261 ASN1_item_ex_free(pval
, it
);
264 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I
, ASN1_R_NO_MATCHING_CHOICE_TYPE
);
267 asn1_set_choice_selector(pval
, i
, it
);
269 if(asn1_cb
&& !asn1_cb(ASN1_OP_D2I_POST
, pval
, it
))
273 case ASN1_ITYPE_SEQUENCE
:
277 /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
279 tag
= V_ASN1_SEQUENCE
;
280 aclass
= V_ASN1_UNIVERSAL
;
282 /* Get SEQUENCE length and update len, p */
283 ret
= asn1_check_tlen(&len
, NULL
, NULL
, &seq_eoc
, &cst
, &p
, len
, tag
, aclass
, opt
, ctx
);
285 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I
, ERR_R_NESTED_ASN1_ERROR
);
287 } else if(ret
== -1) return -1;
288 if(aux
&& (aux
->flags
& ASN1_AFLG_BROKEN
)) {
289 len
= tmplen
- (p
- *in
);
291 } else seq_nolen
= seq_eoc
; /* If indefinite we don't do a length check */
293 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I
, ASN1_R_SEQUENCE_NOT_CONSTRUCTED
);
298 if(!ASN1_item_ex_new(pval
, it
)) {
299 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I
, ERR_R_NESTED_ASN1_ERROR
);
303 if(asn1_cb
&& !asn1_cb(ASN1_OP_D2I_PRE
, pval
, it
))
306 /* Get each field entry */
307 for(i
= 0, tt
= it
->templates
; i
< it
->tcount
; i
++, tt
++) {
308 const ASN1_TEMPLATE
*seqtt
;
309 ASN1_VALUE
**pseqval
;
310 seqtt
= asn1_do_adb(pval
, tt
, 1);
312 pseqval
= asn1_get_field_ptr(pval
, seqtt
);
313 /* Have we ran out of data? */
316 if(asn1_check_eoc(&p
, len
)) {
318 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I
, ASN1_R_UNEXPECTED_EOC
);
326 /* This determines the OPTIONAL flag value. The field cannot
327 * be omitted if it is the last of a SEQUENCE and there is
328 * still data to be read. This isn't strictly necessary but
329 * it increases efficiency in some cases.
331 if(i
== (it
->tcount
- 1)) isopt
= 0;
332 else isopt
= (char)(seqtt
->flags
& ASN1_TFLG_OPTIONAL
);
333 /* attempt to read in field, allowing each to be OPTIONAL */
334 ret
= asn1_template_ex_d2i(pseqval
, &p
, len
, seqtt
, isopt
, ctx
);
338 } else if(ret
== -1) {
339 /* OPTIONAL component absent. Free and zero the field
341 ASN1_template_free(pseqval
, seqtt
);
347 /* Check for EOC if expecting one */
348 if(seq_eoc
&& !asn1_check_eoc(&p
, len
)) {
349 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I
, ASN1_R_MISSING_EOC
);
352 /* Check all data read */
353 if(!seq_nolen
&& len
) {
354 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I
, ASN1_R_SEQUENCE_LENGTH_MISMATCH
);
358 /* If we get here we've got no more data in the SEQUENCE,
359 * however we may not have read all fields so check all
360 * remaining are OPTIONAL and clear any that are.
362 for(; i
< it
->tcount
; tt
++, i
++) {
363 const ASN1_TEMPLATE
*seqtt
;
364 seqtt
= asn1_do_adb(pval
, tt
, 1);
366 if(seqtt
->flags
& ASN1_TFLG_OPTIONAL
) {
367 ASN1_VALUE
**pseqval
;
368 pseqval
= asn1_get_field_ptr(pval
, seqtt
);
369 ASN1_template_free(pseqval
, seqtt
);
372 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I
, ASN1_R_FIELD_MISSING
);
377 if(!asn1_enc_save(pval
, *in
, p
- *in
, it
)) goto auxerr
;
379 if(asn1_cb
&& !asn1_cb(ASN1_OP_D2I_POST
, pval
, it
))
387 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I
, ASN1_R_AUX_ERROR
);
389 ASN1_item_ex_free(pval
, it
);
390 if(errtt
) ERR_add_error_data(4, "Field=", errtt
->field_name
, ", Type=", it
->sname
);
391 else ERR_add_error_data(2, "Type=", it
->sname
);
395 /* Templates are handled with two separate functions. One handles any EXPLICIT tag and the other handles the
399 int asn1_template_ex_d2i(ASN1_VALUE
**val
, unsigned char **in
, long inlen
, const ASN1_TEMPLATE
*tt
, char opt
, ASN1_TLC
*ctx
)
404 unsigned char *p
, *q
;
408 aclass
= flags
& ASN1_TFLG_TAG_CLASS
;
412 /* Check if EXPLICIT tag expected */
413 if(flags
& ASN1_TFLG_EXPTAG
) {
415 /* Need to work out amount of data available to the inner content and where it
416 * starts: so read in EXPLICIT header to get the info.
418 ret
= asn1_check_tlen(&len
, NULL
, NULL
, &exp_eoc
, &cst
, &p
, inlen
, tt
->tag
, aclass
, opt
, ctx
);
421 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I
, ERR_R_NESTED_ASN1_ERROR
);
423 } else if(ret
== -1) return -1;
425 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I
, ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED
);
428 /* We've found the field so it can't be OPTIONAL now */
429 ret
= asn1_template_noexp_d2i(val
, &p
, len
, tt
, 0, ctx
);
431 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I
, ERR_R_NESTED_ASN1_ERROR
);
434 /* We read the field in OK so update length */
437 /* If NDEF we must have an EOC here */
438 if(!asn1_check_eoc(&p
, len
)) {
439 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I
, ASN1_R_MISSING_EOC
);
443 /* Otherwise we must hit the EXPLICIT tag end or its an error */
445 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I
, ASN1_R_EXPLICIT_LENGTH_MISMATCH
);
450 return asn1_template_noexp_d2i(val
, in
, inlen
, tt
, opt
, ctx
);
456 ASN1_template_free(val
, tt
);
461 static int asn1_template_noexp_d2i(ASN1_VALUE
**val
, unsigned char **in
, long len
, const ASN1_TEMPLATE
*tt
, char opt
, ASN1_TLC
*ctx
)
465 unsigned char *p
, *q
;
468 aclass
= flags
& ASN1_TFLG_TAG_CLASS
;
473 if(flags
& ASN1_TFLG_SK_MASK
) {
474 /* SET OF, SEQUENCE OF */
477 /* First work out expected inner tag value */
478 if(flags
& ASN1_TFLG_IMPTAG
) {
482 skaclass
= V_ASN1_UNIVERSAL
;
483 if(flags
& ASN1_TFLG_SET_OF
) sktag
= V_ASN1_SET
;
484 else sktag
= V_ASN1_SEQUENCE
;
487 ret
= asn1_check_tlen(&len
, NULL
, NULL
, &sk_eoc
, NULL
, &p
, len
, sktag
, skaclass
, opt
, ctx
);
489 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I
, ERR_R_NESTED_ASN1_ERROR
);
491 } else if(ret
== -1) return -1;
492 if(!*val
) *val
= (ASN1_VALUE
*)sk_new_null();
494 /* We've got a valid STACK: free up any items present */
495 STACK
*sktmp
= (STACK
*)*val
;
497 while(sk_num(sktmp
) > 0) {
498 vtmp
= (ASN1_VALUE
*)sk_pop(sktmp
);
499 ASN1_item_ex_free(&vtmp
, ASN1_ITEM_ptr(tt
->item
));
504 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I
, ERR_R_MALLOC_FAILURE
);
507 /* Read as many items as we can */
511 /* See if EOC found */
512 if(asn1_check_eoc(&p
, len
)) {
514 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I
, ASN1_R_UNEXPECTED_EOC
);
522 if(!ASN1_item_ex_d2i(&skfield
, &p
, len
, ASN1_ITEM_ptr(tt
->item
), -1, 0, 0, ctx
)) {
523 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I
, ERR_R_NESTED_ASN1_ERROR
);
527 if(!sk_push((STACK
*)*val
, (char *)skfield
)) {
528 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I
, ERR_R_MALLOC_FAILURE
);
533 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I
, ASN1_R_MISSING_EOC
);
536 } else if(flags
& ASN1_TFLG_IMPTAG
) {
537 /* IMPLICIT tagging */
538 ret
= ASN1_item_ex_d2i(val
, &p
, len
, ASN1_ITEM_ptr(tt
->item
), tt
->tag
, aclass
, opt
, ctx
);
540 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I
, ERR_R_NESTED_ASN1_ERROR
);
542 } else if(ret
== -1) return -1;
544 /* Nothing special */
545 ret
= ASN1_item_ex_d2i(val
, &p
, len
, ASN1_ITEM_ptr(tt
->item
), -1, 0, opt
, ctx
);
547 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I
, ERR_R_NESTED_ASN1_ERROR
);
549 } else if(ret
== -1) return -1;
556 ASN1_template_free(val
, tt
);
561 static int asn1_d2i_ex_primitive(ASN1_VALUE
**pval
, unsigned char **in
, long inlen
,
563 int tag
, int aclass
, char opt
, ASN1_TLC
*ctx
)
567 char cst
, inf
, free_cont
= 0;
570 unsigned char *cont
= NULL
;
573 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE
, ASN1_R_ILLEGAL_NULL
);
574 return 0; /* Should never happen */
577 if(it
->itype
== ASN1_ITYPE_MSTRING
) {
580 } else utype
= it
->utype
;
582 if(utype
== V_ASN1_ANY
) {
583 /* If type is ANY need to figure out type from tag */
584 unsigned char oclass
;
586 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE
, ASN1_R_ILLEGAL_TAGGED_ANY
);
590 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE
, ASN1_R_ILLEGAL_OPTIONAL_ANY
);
594 ret
= asn1_check_tlen(NULL
, &utype
, &oclass
, NULL
, NULL
, &p
, inlen
, -1, 0, 0, ctx
);
596 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE
, ERR_R_NESTED_ASN1_ERROR
);
599 if(oclass
!= V_ASN1_UNIVERSAL
) utype
= V_ASN1_OTHER
;
603 aclass
= V_ASN1_UNIVERSAL
;
607 ret
= asn1_check_tlen(&plen
, NULL
, NULL
, &inf
, &cst
, &p
, inlen
, tag
, aclass
, opt
, ctx
);
609 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE
, ERR_R_NESTED_ASN1_ERROR
);
611 } else if(ret
== -1) return -1;
612 /* SEQUENCE, SET and "OTHER" are left in encoded form */
613 if((utype
== V_ASN1_SEQUENCE
) || (utype
== V_ASN1_SET
) || (utype
== V_ASN1_OTHER
)) {
614 /* Clear context cache for type OTHER because the auto clear when
615 * we have a exact match wont work
617 if(utype
== V_ASN1_OTHER
) {
619 /* SEQUENCE and SET must be constructed */
621 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE
, ASN1_R_TYPE_NOT_CONSTRUCTED
);
626 /* If indefinite length constructed find the real end */
628 if(!asn1_collect(NULL
, &p
, plen
, inf
, -1, -1)) goto err
;
631 len
= p
- cont
+ plen
;
639 /* Should really check the internal tags are correct but
640 * some things may get this wrong. The relevant specs
641 * say that constructed string types should be OCTET STRINGs
642 * internally irrespective of the type. So instead just check
643 * for UNIVERSAL class and ignore the tag.
645 if(!asn1_collect(&buf
, &p
, plen
, inf
, -1, V_ASN1_UNIVERSAL
)) goto err
;
647 /* Append a final null to string */
648 if(!BUF_MEM_grow(&buf
, len
+ 1)) {
649 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE
, ERR_R_MALLOC_FAILURE
);
653 cont
= (unsigned char *)buf
.data
;
661 /* We now have content length and type: translate into a structure */
662 if(!asn1_ex_c2i(pval
, cont
, len
, utype
, &free_cont
, it
)) goto err
;
667 if(free_cont
&& buf
.data
) OPENSSL_free(buf
.data
);
671 /* Translate ASN1 content octets into a structure */
673 int asn1_ex_c2i(ASN1_VALUE
**pval
, unsigned char *cont
, int len
, int utype
, char *free_cont
, const ASN1_ITEM
*it
)
676 ASN1_TYPE
*typ
= NULL
;
678 const ASN1_PRIMITIVE_FUNCS
*pf
;
681 if(pf
&& pf
->prim_c2i
) return pf
->prim_c2i(pval
, cont
, len
, utype
, free_cont
, it
);
682 /* If ANY type clear type and set pointer to internal value */
683 if(it
->utype
== V_ASN1_ANY
) {
685 typ
= ASN1_TYPE_new();
686 *pval
= (ASN1_VALUE
*)typ
;
687 } else typ
= (ASN1_TYPE
*)*pval
;
688 if(utype
!= typ
->type
) ASN1_TYPE_set(typ
, utype
, NULL
);
689 pval
= (ASN1_VALUE
**)&typ
->value
.ptr
;
693 if(!c2i_ASN1_OBJECT((ASN1_OBJECT
**)pval
, &cont
, len
)) goto err
;
698 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE
, ASN1_R_NULL_IS_WRONG_LENGTH
);
701 *pval
= (ASN1_VALUE
*)1;
706 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE
, ASN1_R_BOOLEAN_IS_WRONG_LENGTH
);
710 tbool
= (ASN1_BOOLEAN
*)pval
;
715 case V_ASN1_BIT_STRING
:
716 if(!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING
**)pval
, &cont
, len
)) goto err
;
720 case V_ASN1_NEG_INTEGER
:
721 case V_ASN1_ENUMERATED
:
722 case V_ASN1_NEG_ENUMERATED
:
723 tint
= (ASN1_INTEGER
**)pval
;
724 if(!c2i_ASN1_INTEGER(tint
, &cont
, len
)) goto err
;
725 /* Fixup type to match the expected form */
726 (*tint
)->type
= utype
| ((*tint
)->type
& V_ASN1_NEG
);
729 case V_ASN1_OCTET_STRING
:
730 case V_ASN1_NUMERICSTRING
:
731 case V_ASN1_PRINTABLESTRING
:
732 case V_ASN1_T61STRING
:
733 case V_ASN1_VIDEOTEXSTRING
:
734 case V_ASN1_IA5STRING
:
736 case V_ASN1_GENERALIZEDTIME
:
737 case V_ASN1_GRAPHICSTRING
:
738 case V_ASN1_VISIBLESTRING
:
739 case V_ASN1_GENERALSTRING
:
740 case V_ASN1_UNIVERSALSTRING
:
741 case V_ASN1_BMPSTRING
:
742 case V_ASN1_UTF8STRING
:
745 case V_ASN1_SEQUENCE
:
747 /* All based on ASN1_STRING and handled the same */
749 stmp
= ASN1_STRING_type_new(utype
);
751 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE
, ERR_R_MALLOC_FAILURE
);
754 *pval
= (ASN1_VALUE
*)stmp
;
756 stmp
= (ASN1_STRING
*)*pval
;
759 /* If we've already allocated a buffer use it */
761 if(stmp
->data
) OPENSSL_free(stmp
->data
);
766 if(!ASN1_STRING_set(stmp
, cont
, len
)) {
767 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE
, ERR_R_MALLOC_FAILURE
);
768 ASN1_STRING_free(stmp
);
775 /* If ASN1_ANY and NULL type fix up value */
776 if(typ
&& utype
==V_ASN1_NULL
) typ
->value
.ptr
= NULL
;
780 if(!ret
) ASN1_TYPE_free(typ
);
784 /* This function collects the asn1 data from a constructred string
785 * type into a buffer. The values of 'in' and 'len' should refer
786 * to the contents of the constructed type and 'inf' should be set
787 * if it is indefinite length. If 'buf' is NULL then we just want
788 * to find the end of the current structure: useful for indefinite
789 * length constructed stuff.
792 static int asn1_collect(BUF_MEM
*buf
, unsigned char **in
, long len
, char inf
, int tag
, int aclass
)
794 unsigned char *p
, *q
;
799 /* If no buffer and not indefinite length constructed just pass over the encoded data */
807 if(asn1_check_eoc(&p
, len
)) {
808 /* EOC is illegal outside indefinite length constructed form */
810 ASN1err(ASN1_F_ASN1_COLLECT
, ASN1_R_UNEXPECTED_EOC
);
816 if(!asn1_check_tlen(&plen
, NULL
, NULL
, &ininf
, &cst
, &p
, len
, tag
, aclass
, 0, NULL
)) {
817 ASN1err(ASN1_F_ASN1_COLLECT
, ERR_R_NESTED_ASN1_ERROR
);
820 /* If indefinite length constructed update max length */
822 if(!asn1_collect(buf
, &p
, plen
, ininf
, tag
, aclass
)) return 0;
824 if(!collect_data(buf
, &p
, plen
)) return 0;
829 ASN1err(ASN1_F_ASN1_COLLECT
, ASN1_R_MISSING_EOC
);
836 static int collect_data(BUF_MEM
*buf
, unsigned char **p
, long plen
)
841 if(!BUF_MEM_grow(buf
, len
+ plen
)) {
842 ASN1err(ASN1_F_COLLECT_DATA
, ERR_R_MALLOC_FAILURE
);
845 memcpy(buf
->data
+ len
, *p
, plen
);
851 /* Check for ASN1 EOC and swallow it if found */
853 static int asn1_check_eoc(unsigned char **in
, long len
)
856 if(len
< 2) return 0;
865 /* Check an ASN1 tag and length: a bit like ASN1_get_object
866 * but it sets the length for indefinite length constructed
867 * form, we don't know the exact length but we can set an
868 * upper bound to the amount of data available minus the
869 * header length just read.
872 static int asn1_check_tlen(long *olen
, int *otag
, unsigned char *oclass
, char *inf
, char *cst
,
873 unsigned char **in
, long len
, int exptag
, int expclass
, char opt
, ASN1_TLC
*ctx
)
878 unsigned char *p
, *q
;
882 if(ctx
&& ctx
->valid
) {
885 pclass
= ctx
->pclass
;
889 i
= ASN1_get_object(&p
, &plen
, &ptag
, &pclass
, len
);
893 ctx
->pclass
= pclass
;
897 /* If definite length, length + header can't exceed total
898 * amount of data available.
900 if(!(i
& 1) && ((plen
+ ctx
->hdrlen
) > len
)) {
901 ASN1err(ASN1_F_ASN1_CHECK_TLEN
, ASN1_R_TOO_LONG
);
909 ASN1err(ASN1_F_ASN1_CHECK_TLEN
, ASN1_R_BAD_OBJECT_HEADER
);
914 if((exptag
!= ptag
) || (expclass
!= pclass
)) {
915 /* If type is OPTIONAL, not an error, but indicate missing
920 ASN1err(ASN1_F_ASN1_CHECK_TLEN
, ASN1_R_WRONG_TAG
);
923 /* We have a tag and class match, so assume we are going to do something with it */
927 if(i
& 1) plen
= len
- (p
- q
);
929 if(inf
) *inf
= i
& 1;
931 if(cst
) *cst
= i
& V_ASN1_CONSTRUCTED
;
933 if(olen
) *olen
= plen
;
934 if(oclass
) *oclass
= pclass
;
935 if(otag
) *otag
= ptag
;