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 /* Table to convert tags to bit values, used for MSTRING type */
79 static unsigned long tag2bit[32]={
80 0, 0, 0, B_ASN1_BIT_STRING, /* tags 0 - 3 */
81 B_ASN1_OCTET_STRING, 0, 0, B_ASN1_UNKNOWN,/* tags 4- 7 */
82 B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,/* tags 8-11 */
83 B_ASN1_UTF8STRING,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,/* tags 12-15 */
84 0, 0, B_ASN1_NUMERICSTRING,B_ASN1_PRINTABLESTRING, /* tags 16-19 */
85 B_ASN1_T61STRING,B_ASN1_VIDEOTEXSTRING,B_ASN1_IA5STRING, /* tags 20-22 */
86 B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME, /* tags 23-24 */
87 B_ASN1_GRAPHICSTRING,B_ASN1_ISO64STRING,B_ASN1_GENERALSTRING, /* tags 25-27 */
88 B_ASN1_UNIVERSALSTRING,B_ASN1_UNKNOWN,B_ASN1_BMPSTRING,B_ASN1_UNKNOWN, /* tags 28-31 */
91 unsigned long ASN1_tag2bit(int tag)
93 if((tag < 0) || (tag > 30)) return 0;
97 /* Macro to initialize and invalidate the cache */
99 #define asn1_tlc_clear(c) if(c) (c)->valid = 0
101 /* Decode an ASN1 item, this currently behaves just
102 * like a standard 'd2i' function. 'in' points to
103 * a buffer to read the data from, in future we will
104 * have more advanced versions that can input data
105 * a piece at a time and this will simply be a special
109 ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_ITEM *it)
112 ASN1_VALUE *ptmpval = NULL;
113 if(!pval) pval = &ptmpval;
115 if(ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0)
120 int ASN1_template_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_TEMPLATE *tt)
124 return asn1_template_ex_d2i(pval, in, len, tt, 0, &c);
128 /* Decode an item, taking care of IMPLICIT tagging, if any.
129 * If 'opt' set and tag mismatch return -1 to handle OPTIONAL
132 int ASN1_item_ex_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_ITEM *it,
133 int tag, int aclass, char opt, ASN1_TLC *ctx)
135 const ASN1_TEMPLATE *tt, *errtt = NULL;
136 const ASN1_COMPAT_FUNCS *cf;
137 const ASN1_EXTERN_FUNCS *ef;
138 const ASN1_AUX *aux = it->funcs;
139 ASN1_aux_cb *asn1_cb;
140 unsigned char *p, *q, imphack = 0, oclass;
141 char seq_eoc, seq_nolen, cst, isopt;
146 ASN1_VALUE *pchval, **pchptr, *ptmpval;
148 if(aux && aux->asn1_cb) asn1_cb = aux->asn1_cb;
153 case ASN1_ITYPE_PRIMITIVE:
155 /* tagging or OPTIONAL is currently illegal on an item template
156 * because the flags can't get passed down. In practice this isn't
157 * a problem: we include the relevant flags from the item template
158 * in the template itself.
160 if ((tag != -1) || opt) {
161 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);
164 return asn1_template_ex_d2i(pval, in, len, it->templates, opt, ctx);
166 return asn1_d2i_ex_primitive(pval, in, len, it, tag, aclass, opt, ctx);
169 case ASN1_ITYPE_MSTRING:
171 /* Just read in tag and class */
172 ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL, &p, len, -1, 0, 1, ctx);
174 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
177 /* Must be UNIVERSAL class */
178 if(oclass != V_ASN1_UNIVERSAL) {
179 /* If OPTIONAL, assume this is OK */
181 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MSTRING_NOT_UNIVERSAL);
184 /* Check tag matches bit map */
185 if(!(ASN1_tag2bit(otag) & it->utype)) {
186 /* If OPTIONAL, assume this is OK */
188 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MSTRING_WRONG_TAG);
191 return asn1_d2i_ex_primitive(pval, in, len, it, otag, 0, 0, ctx);
193 case ASN1_ITYPE_EXTERN:
194 /* Use new style d2i */
196 return ef->asn1_ex_d2i(pval, in, len, it, tag, aclass, opt, ctx);
198 case ASN1_ITYPE_COMPAT:
199 /* we must resort to old style evil hackery */
202 /* If OPTIONAL see if it is there */
206 if(tag == -1) exptag = it->utype;
208 /* Don't care about anything other than presence of expected tag */
209 ret = asn1_check_tlen(NULL, NULL, NULL, NULL, NULL, &p, len, exptag, aclass, 1, ctx);
211 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
214 if(ret == -1) return -1;
216 /* This is the old style evil hack IMPLICIT handling:
217 * since the underlying code is expecting a tag and
218 * class other than the one present we change the
219 * buffer temporarily then change it back afterwards.
220 * This doesn't and never did work for tags > 30.
222 * Yes this is *horrible* but it is only needed for
223 * old style d2i which will hopefully not be around
225 * FIXME: should copy the buffer then modify it so
226 * the input buffer can be const: we should *always*
227 * copy because the old style d2i might modify the
234 *p = (unsigned char)((*p & V_ASN1_CONSTRUCTED) | it->utype);
237 ptmpval = cf->asn1_d2i(pval, in, len);
239 if(tag != -1) *p = imphack;
241 if(ptmpval) return 1;
242 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
246 case ASN1_ITYPE_CHOICE:
247 if(asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))
250 /* Allocate structure */
252 if(!ASN1_item_ex_new(pval, it)) {
253 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
257 /* CHOICE type, try each possibility in turn */
260 for(i = 0, tt=it->templates; i < it->tcount; i++, tt++) {
261 pchptr = asn1_get_field_ptr(pval, tt);
262 /* We mark field as OPTIONAL so its absence
265 ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx);
266 /* If field not present, try the next one */
267 if(ret == -1) continue;
268 /* If positive return, read OK, break loop */
270 /* Otherwise must be an ASN1 parsing error */
272 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
275 /* Did we fall off the end without reading anything? */
276 if(i == it->tcount) {
277 /* If OPTIONAL, this is OK */
279 /* Free and zero it */
280 ASN1_item_ex_free(pval, it);
283 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_NO_MATCHING_CHOICE_TYPE);
286 asn1_set_choice_selector(pval, i, it);
288 if(asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))
292 case ASN1_ITYPE_SEQUENCE:
296 /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
298 tag = V_ASN1_SEQUENCE;
299 aclass = V_ASN1_UNIVERSAL;
301 /* Get SEQUENCE length and update len, p */
302 ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst, &p, len, tag, aclass, opt, ctx);
304 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
306 } else if(ret == -1) return -1;
307 if(aux && (aux->flags & ASN1_AFLG_BROKEN)) {
308 len = tmplen - (p - *in);
310 } else seq_nolen = seq_eoc; /* If indefinite we don't do a length check */
312 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
317 if(!ASN1_item_ex_new(pval, it)) {
318 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
322 if(asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))
325 /* Get each field entry */
326 for(i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
327 const ASN1_TEMPLATE *seqtt;
328 ASN1_VALUE **pseqval;
329 seqtt = asn1_do_adb(pval, tt, 1);
331 pseqval = asn1_get_field_ptr(pval, seqtt);
332 /* Have we ran out of data? */
335 if(asn1_check_eoc(&p, len)) {
337 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_UNEXPECTED_EOC);
345 /* This determines the OPTIONAL flag value. The field cannot
346 * be omitted if it is the last of a SEQUENCE and there is
347 * still data to be read. This isn't strictly necessary but
348 * it increases efficiency in some cases.
350 if(i == (it->tcount - 1)) isopt = 0;
351 else isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
352 /* attempt to read in field, allowing each to be OPTIONAL */
353 ret = asn1_template_ex_d2i(pseqval, &p, len, seqtt, isopt, ctx);
357 } else if(ret == -1) {
358 /* OPTIONAL component absent. Free and zero the field
360 ASN1_template_free(pseqval, seqtt);
366 /* Check for EOC if expecting one */
367 if(seq_eoc && !asn1_check_eoc(&p, len)) {
368 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MISSING_EOC);
371 /* Check all data read */
372 if(!seq_nolen && len) {
373 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_SEQUENCE_LENGTH_MISMATCH);
377 /* If we get here we've got no more data in the SEQUENCE,
378 * however we may not have read all fields so check all
379 * remaining are OPTIONAL and clear any that are.
381 for(; i < it->tcount; tt++, i++) {
382 const ASN1_TEMPLATE *seqtt;
383 seqtt = asn1_do_adb(pval, tt, 1);
385 if(seqtt->flags & ASN1_TFLG_OPTIONAL) {
386 ASN1_VALUE **pseqval;
387 pseqval = asn1_get_field_ptr(pval, seqtt);
388 ASN1_template_free(pseqval, seqtt);
391 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_FIELD_MISSING);
396 if(!asn1_enc_save(pval, *in, p - *in, it)) goto auxerr;
398 if(asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))
406 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_AUX_ERROR);
408 ASN1_item_ex_free(pval, it);
409 if(errtt) ERR_add_error_data(4, "Field=", errtt->field_name, ", Type=", it->sname);
410 else ERR_add_error_data(2, "Type=", it->sname);
414 /* Templates are handled with two separate functions. One handles any EXPLICIT tag and the other handles the
418 static int asn1_template_ex_d2i(ASN1_VALUE **val, unsigned char **in, long inlen, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx)
423 unsigned char *p, *q;
427 aclass = flags & ASN1_TFLG_TAG_CLASS;
431 /* Check if EXPLICIT tag expected */
432 if(flags & ASN1_TFLG_EXPTAG) {
434 /* Need to work out amount of data available to the inner content and where it
435 * starts: so read in EXPLICIT header to get the info.
437 ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst, &p, inlen, tt->tag, aclass, opt, ctx);
440 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
442 } else if(ret == -1) return -1;
444 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);
447 /* We've found the field so it can't be OPTIONAL now */
448 ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx);
450 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
453 /* We read the field in OK so update length */
456 /* If NDEF we must have an EOC here */
457 if(!asn1_check_eoc(&p, len)) {
458 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ASN1_R_MISSING_EOC);
462 /* Otherwise we must hit the EXPLICIT tag end or its an error */
464 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ASN1_R_EXPLICIT_LENGTH_MISMATCH);
469 return asn1_template_noexp_d2i(val, in, inlen, tt, opt, ctx);
475 ASN1_template_free(val, tt);
480 static int asn1_template_noexp_d2i(ASN1_VALUE **val, unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx)
484 unsigned char *p, *q;
487 aclass = flags & ASN1_TFLG_TAG_CLASS;
492 if(flags & ASN1_TFLG_SK_MASK) {
493 /* SET OF, SEQUENCE OF */
496 /* First work out expected inner tag value */
497 if(flags & ASN1_TFLG_IMPTAG) {
501 skaclass = V_ASN1_UNIVERSAL;
502 if(flags & ASN1_TFLG_SET_OF) sktag = V_ASN1_SET;
503 else sktag = V_ASN1_SEQUENCE;
506 ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL, &p, len, sktag, skaclass, opt, ctx);
508 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
510 } else if(ret == -1) return -1;
511 if(!*val) *val = (ASN1_VALUE *)sk_new_null();
513 /* We've got a valid STACK: free up any items present */
514 STACK *sktmp = (STACK *)*val;
516 while(sk_num(sktmp) > 0) {
517 vtmp = (ASN1_VALUE *)sk_pop(sktmp);
518 ASN1_item_ex_free(&vtmp, ASN1_ITEM_ptr(tt->item));
523 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_MALLOC_FAILURE);
526 /* Read as many items as we can */
530 /* See if EOC found */
531 if(asn1_check_eoc(&p, len)) {
533 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ASN1_R_UNEXPECTED_EOC);
541 if(!ASN1_item_ex_d2i(&skfield, &p, len, ASN1_ITEM_ptr(tt->item), -1, 0, 0, ctx)) {
542 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ERR_R_NESTED_ASN1_ERROR);
546 if(!sk_push((STACK *)*val, (char *)skfield)) {
547 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ERR_R_MALLOC_FAILURE);
552 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ASN1_R_MISSING_EOC);
555 } else if(flags & ASN1_TFLG_IMPTAG) {
556 /* IMPLICIT tagging */
557 ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt, ctx);
559 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ERR_R_NESTED_ASN1_ERROR);
561 } else if(ret == -1) return -1;
563 /* Nothing special */
564 ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item), -1, 0, opt, ctx);
566 ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ERR_R_NESTED_ASN1_ERROR);
568 } else if(ret == -1) return -1;
575 ASN1_template_free(val, tt);
580 static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, unsigned char **in, long inlen,
582 int tag, int aclass, char opt, ASN1_TLC *ctx)
586 char cst, inf, free_cont = 0;
589 unsigned char *cont = NULL;
592 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL);
593 return 0; /* Should never happen */
596 if(it->itype == ASN1_ITYPE_MSTRING) {
599 } else utype = it->utype;
601 if(utype == V_ASN1_ANY) {
602 /* If type is ANY need to figure out type from tag */
603 unsigned char oclass;
605 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_TAGGED_ANY);
609 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_OPTIONAL_ANY);
613 ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL, &p, inlen, -1, 0, 0, ctx);
615 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
618 if(oclass != V_ASN1_UNIVERSAL) utype = V_ASN1_OTHER;
622 aclass = V_ASN1_UNIVERSAL;
626 ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst, &p, inlen, tag, aclass, opt, ctx);
628 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
630 } else if(ret == -1) return -1;
631 /* SEQUENCE, SET and "OTHER" are left in encoded form */
632 if((utype == V_ASN1_SEQUENCE) || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER)) {
633 /* Clear context cache for type OTHER because the auto clear when
634 * we have a exact match wont work
636 if(utype == V_ASN1_OTHER) {
638 /* SEQUENCE and SET must be constructed */
640 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_TYPE_NOT_CONSTRUCTED);
645 /* If indefinite length constructed find the real end */
647 if(!asn1_collect(NULL, &p, plen, inf, -1, -1)) goto err;
650 len = p - cont + plen;
658 /* Should really check the internal tags are correct but
659 * some things may get this wrong. The relevant specs
660 * say that constructed string types should be OCTET STRINGs
661 * internally irrespective of the type. So instead just check
662 * for UNIVERSAL class and ignore the tag.
664 if(!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL)) goto err;
666 /* Append a final null to string */
667 if(!BUF_MEM_grow_clean(&buf, len + 1)) {
668 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE);
672 cont = (unsigned char *)buf.data;
680 /* We now have content length and type: translate into a structure */
681 if(!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it)) goto err;
686 if(free_cont && buf.data) OPENSSL_free(buf.data);
690 /* Translate ASN1 content octets into a structure */
692 int asn1_ex_c2i(ASN1_VALUE **pval, unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it)
695 ASN1_TYPE *typ = NULL;
697 const ASN1_PRIMITIVE_FUNCS *pf;
700 if(pf && pf->prim_c2i) return pf->prim_c2i(pval, cont, len, utype, free_cont, it);
701 /* If ANY type clear type and set pointer to internal value */
702 if(it->utype == V_ASN1_ANY) {
704 typ = ASN1_TYPE_new();
705 *pval = (ASN1_VALUE *)typ;
706 } else typ = (ASN1_TYPE *)*pval;
707 if(utype != typ->type) ASN1_TYPE_set(typ, utype, NULL);
708 pval = (ASN1_VALUE **)&typ->value.ptr;
712 if(!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len)) goto err;
717 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_NULL_IS_WRONG_LENGTH);
720 *pval = (ASN1_VALUE *)1;
725 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_BOOLEAN_IS_WRONG_LENGTH);
729 tbool = (ASN1_BOOLEAN *)pval;
734 case V_ASN1_BIT_STRING:
735 if(!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len)) goto err;
739 case V_ASN1_NEG_INTEGER:
740 case V_ASN1_ENUMERATED:
741 case V_ASN1_NEG_ENUMERATED:
742 tint = (ASN1_INTEGER **)pval;
743 if(!c2i_ASN1_INTEGER(tint, &cont, len)) goto err;
744 /* Fixup type to match the expected form */
745 (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG);
748 case V_ASN1_OCTET_STRING:
749 case V_ASN1_NUMERICSTRING:
750 case V_ASN1_PRINTABLESTRING:
751 case V_ASN1_T61STRING:
752 case V_ASN1_VIDEOTEXSTRING:
753 case V_ASN1_IA5STRING:
755 case V_ASN1_GENERALIZEDTIME:
756 case V_ASN1_GRAPHICSTRING:
757 case V_ASN1_VISIBLESTRING:
758 case V_ASN1_GENERALSTRING:
759 case V_ASN1_UNIVERSALSTRING:
760 case V_ASN1_BMPSTRING:
761 case V_ASN1_UTF8STRING:
764 case V_ASN1_SEQUENCE:
766 /* All based on ASN1_STRING and handled the same */
768 stmp = ASN1_STRING_type_new(utype);
770 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE);
773 *pval = (ASN1_VALUE *)stmp;
775 stmp = (ASN1_STRING *)*pval;
778 /* If we've already allocated a buffer use it */
780 if(stmp->data) OPENSSL_free(stmp->data);
785 if(!ASN1_STRING_set(stmp, cont, len)) {
786 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE);
787 ASN1_STRING_free(stmp);
794 /* If ASN1_ANY and NULL type fix up value */
795 if(typ && utype==V_ASN1_NULL) typ->value.ptr = NULL;
799 if(!ret) ASN1_TYPE_free(typ);
803 /* This function collects the asn1 data from a constructred string
804 * type into a buffer. The values of 'in' and 'len' should refer
805 * to the contents of the constructed type and 'inf' should be set
806 * if it is indefinite length. If 'buf' is NULL then we just want
807 * to find the end of the current structure: useful for indefinite
808 * length constructed stuff.
811 static int asn1_collect(BUF_MEM *buf, unsigned char **in, long len, char inf, int tag, int aclass)
813 unsigned char *p, *q;
818 /* If no buffer and not indefinite length constructed just pass over the encoded data */
826 if(asn1_check_eoc(&p, len)) {
827 /* EOC is illegal outside indefinite length constructed form */
829 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_UNEXPECTED_EOC);
835 if(!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p, len, tag, aclass, 0, NULL)) {
836 ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR);
839 /* If indefinite length constructed update max length */
841 if(!asn1_collect(buf, &p, plen, ininf, tag, aclass)) return 0;
843 if(!collect_data(buf, &p, plen)) return 0;
848 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC);
855 static int collect_data(BUF_MEM *buf, unsigned char **p, long plen)
860 if(!BUF_MEM_grow_clean(buf, len + plen)) {
861 ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE);
864 memcpy(buf->data + len, *p, plen);
870 /* Check for ASN1 EOC and swallow it if found */
872 static int asn1_check_eoc(unsigned char **in, long len)
875 if(len < 2) return 0;
884 /* Check an ASN1 tag and length: a bit like ASN1_get_object
885 * but it sets the length for indefinite length constructed
886 * form, we don't know the exact length but we can set an
887 * upper bound to the amount of data available minus the
888 * header length just read.
891 static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass, char *inf, char *cst,
892 unsigned char **in, long len, int exptag, int expclass, char opt, ASN1_TLC *ctx)
897 unsigned char *p, *q;
901 if(ctx && ctx->valid) {
904 pclass = ctx->pclass;
908 i = ASN1_get_object(&p, &plen, &ptag, &pclass, len);
912 ctx->pclass = pclass;
916 /* If definite length, and no error, length +
917 * header can't exceed total amount of data available.
919 if(!(i & 0x81) && ((plen + ctx->hdrlen) > len)) {
920 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_TOO_LONG);
928 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER);
933 if((exptag != ptag) || (expclass != pclass)) {
934 /* If type is OPTIONAL, not an error, but indicate missing
939 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG);
942 /* We have a tag and class match, so assume we are going to do something with it */
946 if(i & 1) plen = len - (p - q);
948 if(inf) *inf = i & 1;
950 if(cst) *cst = i & V_ASN1_CONSTRUCTED;
952 if(olen) *olen = plen;
953 if(oclass) *oclass = pclass;
954 if(otag) *otag = ptag;