2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 2000-2005 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(const unsigned char **in, long len);
69 static int asn1_find_end(const unsigned char **in, long len, char inf);
71 static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
72 char inf, int tag, int aclass, int depth);
74 static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen);
76 static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
78 const unsigned char **in, long len,
79 int exptag, int expclass, char opt,
82 static int asn1_template_ex_d2i(ASN1_VALUE **pval,
83 const unsigned char **in, long len,
84 const ASN1_TEMPLATE *tt, char opt,
86 static int asn1_template_noexp_d2i(ASN1_VALUE **val,
87 const unsigned char **in, long len,
88 const ASN1_TEMPLATE *tt, char opt,
90 static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
91 const unsigned char **in, long len,
93 int tag, int aclass, char opt, ASN1_TLC *ctx);
95 /* Table to convert tags to bit values, used for MSTRING type */
96 static const 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 */
108 unsigned long ASN1_tag2bit(int tag)
110 if ((tag < 0) || (tag > 30)) return 0;
114 /* Macro to initialize and invalidate the cache */
116 #define asn1_tlc_clear(c) if (c) (c)->valid = 0
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
126 ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval,
127 const unsigned char **in, long len, const ASN1_ITEM *it)
130 ASN1_VALUE *ptmpval = NULL;
134 if (ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0)
139 int ASN1_template_d2i(ASN1_VALUE **pval,
140 const unsigned char **in, long len, const ASN1_TEMPLATE *tt)
144 return asn1_template_ex_d2i(pval, in, len, tt, 0, &c);
148 /* Decode an item, taking care of IMPLICIT tagging, if any.
149 * If 'opt' set and tag mismatch return -1 to handle OPTIONAL
152 int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len,
154 int tag, int aclass, char opt, ASN1_TLC *ctx)
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;
169 ASN1_VALUE **pchptr, *ptmpval;
172 if (aux && aux->asn1_cb)
173 asn1_cb = aux->asn1_cb;
178 case ASN1_ITYPE_PRIMITIVE:
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
187 if ((tag != -1) || opt)
189 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
190 ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);
193 return asn1_template_ex_d2i(pval, in, len,
194 it->templates, opt, ctx);
196 return asn1_d2i_ex_primitive(pval, in, len, it,
197 tag, aclass, opt, ctx);
200 case ASN1_ITYPE_MSTRING:
202 /* Just read in tag and class */
203 ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL,
204 &p, len, -1, 0, 1, ctx);
207 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
208 ERR_R_NESTED_ASN1_ERROR);
212 /* Must be UNIVERSAL class */
213 if (oclass != V_ASN1_UNIVERSAL)
215 /* If OPTIONAL, assume this is OK */
217 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
218 ASN1_R_MSTRING_NOT_UNIVERSAL);
221 /* Check tag matches bit map */
222 if (!(ASN1_tag2bit(otag) & it->utype))
224 /* If OPTIONAL, assume this is OK */
227 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
228 ASN1_R_MSTRING_WRONG_TAG);
231 return asn1_d2i_ex_primitive(pval, in, len,
232 it, otag, 0, 0, ctx);
234 case ASN1_ITYPE_EXTERN:
235 /* Use new style d2i */
237 return ef->asn1_ex_d2i(pval, in, len,
238 it, tag, aclass, opt, ctx);
240 case ASN1_ITYPE_COMPAT:
241 /* we must resort to old style evil hackery */
244 /* If OPTIONAL see if it is there */
252 /* Don't care about anything other than presence
255 ret = asn1_check_tlen(NULL, NULL, NULL, NULL, NULL,
256 &p, len, exptag, aclass, 1, ctx);
259 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
260 ERR_R_NESTED_ASN1_ERROR);
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.
273 * Yes this is *horrible* but it is only needed for
274 * old style d2i which will hopefully not be around
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
284 wp = *(unsigned char **)in;
288 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
289 ERR_R_NESTED_ASN1_ERROR);
292 *wp = (unsigned char)((*p & V_ASN1_CONSTRUCTED)
296 ptmpval = cf->asn1_d2i(pval, in, len);
304 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
308 case ASN1_ITYPE_CHOICE:
309 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))
312 /* Allocate structure */
313 if (!*pval && !ASN1_item_ex_new(pval, it))
315 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
316 ERR_R_NESTED_ASN1_ERROR);
319 /* CHOICE type, try each possibility in turn */
321 for (i = 0, tt=it->templates; i < it->tcount; i++, tt++)
323 pchptr = asn1_get_field_ptr(pval, tt);
324 /* We mark field as OPTIONAL so its absence
327 ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx);
328 /* If field not present, try the next one */
331 /* If positive return, read OK, break loop */
334 /* Otherwise must be an ASN1 parsing error */
336 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
337 ERR_R_NESTED_ASN1_ERROR);
341 /* Did we fall off the end without reading anything? */
344 /* If OPTIONAL, this is OK */
347 /* Free and zero it */
348 ASN1_item_ex_free(pval, it);
351 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
352 ASN1_R_NO_MATCHING_CHOICE_TYPE);
356 asn1_set_choice_selector(pval, i, it);
358 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))
362 case ASN1_ITYPE_NDEF_SEQUENCE:
363 case ASN1_ITYPE_SEQUENCE:
367 /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
370 tag = V_ASN1_SEQUENCE;
371 aclass = V_ASN1_UNIVERSAL;
373 /* Get SEQUENCE length and update len, p */
374 ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst,
375 &p, len, tag, aclass, opt, ctx);
378 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
379 ERR_R_NESTED_ASN1_ERROR);
384 if (aux && (aux->flags & ASN1_AFLG_BROKEN))
386 len = tmplen - (p - *in);
389 /* If indefinite we don't do a length check */
390 else seq_nolen = seq_eoc;
393 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
394 ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
398 if (!*pval && !ASN1_item_ex_new(pval, it))
400 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
401 ERR_R_NESTED_ASN1_ERROR);
405 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))
408 /* Get each field entry */
409 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++)
411 const ASN1_TEMPLATE *seqtt;
412 ASN1_VALUE **pseqval;
413 seqtt = asn1_do_adb(pval, tt, 1);
416 pseqval = asn1_get_field_ptr(pval, seqtt);
417 /* Have we ran out of data? */
421 if (asn1_check_eoc(&p, len))
425 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
426 ASN1_R_UNEXPECTED_EOC);
434 /* This determines the OPTIONAL flag value. The field
435 * cannot be omitted if it is the last of a SEQUENCE
436 * and there is still data to be read. This isn't
437 * strictly necessary but it increases efficiency in
440 if (i == (it->tcount - 1))
442 else isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
443 /* attempt to read in field, allowing each to be
446 ret = asn1_template_ex_d2i(pseqval, &p, len,
455 /* OPTIONAL component absent.
456 * Free and zero the field.
458 ASN1_template_free(pseqval, seqtt);
465 /* Check for EOC if expecting one */
466 if (seq_eoc && !asn1_check_eoc(&p, len))
468 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MISSING_EOC);
471 /* Check all data read */
472 if (!seq_nolen && len)
474 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
475 ASN1_R_SEQUENCE_LENGTH_MISMATCH);
479 /* If we get here we've got no more data in the SEQUENCE,
480 * however we may not have read all fields so check all
481 * remaining are OPTIONAL and clear any that are.
483 for (; i < it->tcount; tt++, i++)
485 const ASN1_TEMPLATE *seqtt;
486 seqtt = asn1_do_adb(pval, tt, 1);
489 if (seqtt->flags & ASN1_TFLG_OPTIONAL)
491 ASN1_VALUE **pseqval;
492 pseqval = asn1_get_field_ptr(pval, seqtt);
493 ASN1_template_free(pseqval, seqtt);
498 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
499 ASN1_R_FIELD_MISSING);
504 if (!asn1_enc_save(pval, *in, p - *in, it))
507 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))
515 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_AUX_ERROR);
517 ASN1_item_ex_free(pval, it);
519 ERR_add_error_data(4, "Field=", errtt->field_name,
520 ", Type=", it->sname);
522 ERR_add_error_data(2, "Type=", it->sname);
526 /* Templates are handled with two separate functions.
527 * One handles any EXPLICIT tag and the other handles the rest.
530 static int asn1_template_ex_d2i(ASN1_VALUE **val,
531 const unsigned char **in, long inlen,
532 const ASN1_TEMPLATE *tt, char opt,
538 const unsigned char *p, *q;
543 aclass = flags & ASN1_TFLG_TAG_CLASS;
547 /* Check if EXPLICIT tag expected */
548 if (flags & ASN1_TFLG_EXPTAG)
551 /* Need to work out amount of data available to the inner
552 * content and where it starts: so read in EXPLICIT header to
555 ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst,
556 &p, inlen, tt->tag, aclass, opt, ctx);
560 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
561 ERR_R_NESTED_ASN1_ERROR);
568 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
569 ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);
572 /* We've found the field so it can't be OPTIONAL now */
573 ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx);
576 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
577 ERR_R_NESTED_ASN1_ERROR);
580 /* We read the field in OK so update length */
584 /* If NDEF we must have an EOC here */
585 if (!asn1_check_eoc(&p, len))
587 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
594 /* Otherwise we must hit the EXPLICIT tag end or its
598 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
599 ASN1_R_EXPLICIT_LENGTH_MISMATCH);
605 return asn1_template_noexp_d2i(val, in, inlen,
612 ASN1_template_free(val, tt);
616 static int asn1_template_noexp_d2i(ASN1_VALUE **val,
617 const unsigned char **in, long len,
618 const ASN1_TEMPLATE *tt, char opt,
623 const unsigned char *p, *q;
627 aclass = flags & ASN1_TFLG_TAG_CLASS;
632 if (flags & ASN1_TFLG_SK_MASK)
634 /* SET OF, SEQUENCE OF */
637 /* First work out expected inner tag value */
638 if (flags & ASN1_TFLG_IMPTAG)
645 skaclass = V_ASN1_UNIVERSAL;
646 if (flags & ASN1_TFLG_SET_OF)
649 sktag = V_ASN1_SEQUENCE;
652 ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL,
653 &p, len, sktag, skaclass, opt, ctx);
656 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
657 ERR_R_NESTED_ASN1_ERROR);
663 *val = (ASN1_VALUE *)sk_new_null();
666 /* We've got a valid STACK: free up any items present */
667 STACK *sktmp = (STACK *)*val;
669 while(sk_num(sktmp) > 0)
671 vtmp = (ASN1_VALUE *)sk_pop(sktmp);
672 ASN1_item_ex_free(&vtmp,
673 ASN1_ITEM_ptr(tt->item));
679 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
680 ERR_R_MALLOC_FAILURE);
684 /* Read as many items as we can */
689 /* See if EOC found */
690 if (asn1_check_eoc(&p, len))
694 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
695 ASN1_R_UNEXPECTED_EOC);
703 if (!ASN1_item_ex_d2i(&skfield, &p, len,
704 ASN1_ITEM_ptr(tt->item),
707 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
708 ERR_R_NESTED_ASN1_ERROR);
712 if (!sk_push((STACK *)*val, (char *)skfield))
714 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
715 ERR_R_MALLOC_FAILURE);
721 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ASN1_R_MISSING_EOC);
725 else if (flags & ASN1_TFLG_IMPTAG)
727 /* IMPLICIT tagging */
728 ret = ASN1_item_ex_d2i(val, &p, len,
729 ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt, ctx);
732 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
733 ERR_R_NESTED_ASN1_ERROR);
741 /* Nothing special */
742 ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item),
746 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
747 ERR_R_NESTED_ASN1_ERROR);
758 ASN1_template_free(val, tt);
762 static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
763 const unsigned char **in, long inlen,
765 int tag, int aclass, char opt, ASN1_TLC *ctx)
769 char cst, inf, free_cont = 0;
770 const unsigned char *p;
772 const unsigned char *cont = NULL;
776 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL);
777 return 0; /* Should never happen */
780 if (it->itype == ASN1_ITYPE_MSTRING)
788 if (utype == V_ASN1_ANY)
790 /* If type is ANY need to figure out type from tag */
791 unsigned char oclass;
794 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
795 ASN1_R_ILLEGAL_TAGGED_ANY);
800 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
801 ASN1_R_ILLEGAL_OPTIONAL_ANY);
805 ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL,
806 &p, inlen, -1, 0, 0, ctx);
809 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
810 ERR_R_NESTED_ASN1_ERROR);
813 if (oclass != V_ASN1_UNIVERSAL)
814 utype = V_ASN1_OTHER;
819 aclass = V_ASN1_UNIVERSAL;
823 ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst,
824 &p, inlen, tag, aclass, opt, ctx);
827 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
833 /* SEQUENCE, SET and "OTHER" are left in encoded form */
834 if ((utype == V_ASN1_SEQUENCE)
835 || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER))
837 /* Clear context cache for type OTHER because the auto clear
838 * when we have a exact match wont work
840 if (utype == V_ASN1_OTHER)
844 /* SEQUENCE and SET must be constructed */
847 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
848 ASN1_R_TYPE_NOT_CONSTRUCTED);
853 /* If indefinite length constructed find the real end */
856 if (!asn1_find_end(&p, plen, inf))
862 len = p - cont + plen;
872 /* Should really check the internal tags are correct but
873 * some things may get this wrong. The relevant specs
874 * say that constructed string types should be OCTET STRINGs
875 * internally irrespective of the type. So instead just check
876 * for UNIVERSAL class and ignore the tag.
878 if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL, 0))
884 /* Append a final null to string */
885 if (!BUF_MEM_grow_clean(&buf, len + 1))
887 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
888 ERR_R_MALLOC_FAILURE);
892 cont = (const unsigned char *)buf.data;
902 /* We now have content length and type: translate into a structure */
903 if (!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it))
909 if (free_cont && buf.data) OPENSSL_free(buf.data);
913 /* Translate ASN1 content octets into a structure */
915 int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
916 int utype, char *free_cont, const ASN1_ITEM *it)
918 ASN1_VALUE **opval = NULL;
920 ASN1_TYPE *typ = NULL;
922 const ASN1_PRIMITIVE_FUNCS *pf;
926 if (pf && pf->prim_c2i)
927 return pf->prim_c2i(pval, cont, len, utype, free_cont, it);
928 /* If ANY type clear type and set pointer to internal value */
929 if (it->utype == V_ASN1_ANY)
933 typ = ASN1_TYPE_new();
936 *pval = (ASN1_VALUE *)typ;
939 typ = (ASN1_TYPE *)*pval;
941 if (utype != typ->type)
942 ASN1_TYPE_set(typ, utype, NULL);
944 pval = &typ->value.asn1_value;
949 if (!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len))
956 ASN1err(ASN1_F_ASN1_EX_C2I,
957 ASN1_R_NULL_IS_WRONG_LENGTH);
960 *pval = (ASN1_VALUE *)1;
966 ASN1err(ASN1_F_ASN1_EX_C2I,
967 ASN1_R_BOOLEAN_IS_WRONG_LENGTH);
973 tbool = (ASN1_BOOLEAN *)pval;
978 case V_ASN1_BIT_STRING:
979 if (!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len))
984 case V_ASN1_NEG_INTEGER:
985 case V_ASN1_ENUMERATED:
986 case V_ASN1_NEG_ENUMERATED:
987 tint = (ASN1_INTEGER **)pval;
988 if (!c2i_ASN1_INTEGER(tint, &cont, len))
990 /* Fixup type to match the expected form */
991 (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG);
994 case V_ASN1_OCTET_STRING:
995 case V_ASN1_NUMERICSTRING:
996 case V_ASN1_PRINTABLESTRING:
997 case V_ASN1_T61STRING:
998 case V_ASN1_VIDEOTEXSTRING:
999 case V_ASN1_IA5STRING:
1000 case V_ASN1_UTCTIME:
1001 case V_ASN1_GENERALIZEDTIME:
1002 case V_ASN1_GRAPHICSTRING:
1003 case V_ASN1_VISIBLESTRING:
1004 case V_ASN1_GENERALSTRING:
1005 case V_ASN1_UNIVERSALSTRING:
1006 case V_ASN1_BMPSTRING:
1007 case V_ASN1_UTF8STRING:
1010 case V_ASN1_SEQUENCE:
1012 if (utype == V_ASN1_BMPSTRING && (len & 1))
1014 ASN1err(ASN1_F_ASN1_EX_C2I,
1015 ASN1_R_BMPSTRING_IS_WRONG_LENGTH);
1018 if (utype == V_ASN1_UNIVERSALSTRING && (len & 3))
1020 ASN1err(ASN1_F_ASN1_EX_C2I,
1021 ASN1_R_UNIVERSALSTRING_IS_WRONG_LENGTH);
1024 /* All based on ASN1_STRING and handled the same */
1027 stmp = ASN1_STRING_type_new(utype);
1030 ASN1err(ASN1_F_ASN1_EX_C2I,
1031 ERR_R_MALLOC_FAILURE);
1034 *pval = (ASN1_VALUE *)stmp;
1038 stmp = (ASN1_STRING *)*pval;
1041 /* If we've already allocated a buffer use it */
1045 OPENSSL_free(stmp->data);
1046 stmp->data = (unsigned char *)cont; /* UGLY CAST! RL */
1052 if (!ASN1_STRING_set(stmp, cont, len))
1054 ASN1err(ASN1_F_ASN1_EX_C2I,
1055 ERR_R_MALLOC_FAILURE);
1056 ASN1_STRING_free(stmp);
1063 /* If ASN1_ANY and NULL type fix up value */
1064 if (typ && (utype == V_ASN1_NULL))
1065 typ->value.ptr = NULL;
1071 ASN1_TYPE_free(typ);
1079 /* This function finds the end of an ASN1 structure when passed its maximum
1080 * length, whether it is indefinite length and a pointer to the content.
1081 * This is more efficient than calling asn1_collect because it does not
1082 * recurse on each indefinite length header.
1085 static int asn1_find_end(const unsigned char **in, long len, char inf)
1089 const unsigned char *p = *in, *q;
1090 /* If not indefinite length constructed just add length */
1097 /* Indefinite length constructed form. Find the end when enough EOCs
1098 * are found. If more indefinite length constructed headers
1099 * are encountered increment the expected eoc count otherwise just
1100 * skip to the end of the data.
1104 if(asn1_check_eoc(&p, len))
1107 if (expected_eoc == 0)
1113 /* Just read in a header: only care about the length */
1114 if(!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len,
1117 ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR);
1128 ASN1err(ASN1_F_ASN1_FIND_END, ASN1_R_MISSING_EOC);
1134 /* This function collects the asn1 data from a constructred string
1135 * type into a buffer. The values of 'in' and 'len' should refer
1136 * to the contents of the constructed type and 'inf' should be set
1137 * if it is indefinite length.
1140 #ifndef ASN1_MAX_STRING_NEST
1141 /* This determines how many levels of recursion are permitted in ASN1
1142 * string types. If it is not limited stack overflows can occur. If set
1143 * to zero no recursion is allowed at all. Although zero should be adequate
1144 * examples exist that require a value of 1. So 5 should be more than enough.
1146 #define ASN1_MAX_STRING_NEST 5
1150 static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
1151 char inf, int tag, int aclass, int depth)
1153 const unsigned char *p, *q;
1158 /* If no buffer and not indefinite length constructed just pass over
1159 * the encoded data */
1169 if (asn1_check_eoc(&p, len))
1171 /* EOC is illegal outside indefinite length
1172 * constructed form */
1175 ASN1err(ASN1_F_ASN1_COLLECT,
1176 ASN1_R_UNEXPECTED_EOC);
1183 if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p,
1184 len, tag, aclass, 0, NULL))
1186 ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR);
1190 /* If indefinite length constructed update max length */
1193 if (depth >= ASN1_MAX_STRING_NEST)
1195 ASN1err(ASN1_F_ASN1_COLLECT,
1196 ASN1_R_NESTED_ASN1_STRING);
1199 if (!asn1_collect(buf, &p, plen, ininf, tag, aclass,
1203 else if (plen && !collect_data(buf, &p, plen))
1209 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC);
1216 static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen)
1222 if (!BUF_MEM_grow_clean(buf, len + plen))
1224 ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE);
1227 memcpy(buf->data + len, *p, plen);
1233 /* Check for ASN1 EOC and swallow it if found */
1235 static int asn1_check_eoc(const unsigned char **in, long len)
1237 const unsigned char *p;
1238 if (len < 2) return 0;
1248 /* Check an ASN1 tag and length: a bit like ASN1_get_object
1249 * but it sets the length for indefinite length constructed
1250 * form, we don't know the exact length but we can set an
1251 * upper bound to the amount of data available minus the
1252 * header length just read.
1255 static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
1256 char *inf, char *cst,
1257 const unsigned char **in, long len,
1258 int exptag, int expclass, char opt,
1264 const unsigned char *p, *q;
1268 if (ctx && ctx->valid)
1272 pclass = ctx->pclass;
1278 i = ASN1_get_object(&p, &plen, &ptag, &pclass, len);
1283 ctx->pclass = pclass;
1285 ctx->hdrlen = p - q;
1287 /* If definite length, and no error, length +
1288 * header can't exceed total amount of data available.
1290 if (!(i & 0x81) && ((plen + ctx->hdrlen) > len))
1292 ASN1err(ASN1_F_ASN1_CHECK_TLEN,
1294 asn1_tlc_clear(ctx);
1302 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER);
1303 asn1_tlc_clear(ctx);
1308 if ((exptag != ptag) || (expclass != pclass))
1310 /* If type is OPTIONAL, not an error:
1311 * indicate missing type.
1314 asn1_tlc_clear(ctx);
1315 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG);
1318 /* We have a tag and class match:
1319 * assume we are going to do something with it */
1320 asn1_tlc_clear(ctx);
1324 plen = len - (p - q);
1330 *cst = i & V_ASN1_CONSTRUCTED;