2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) 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);
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
117 /* Version to avoid compiler warning about 'c' always non-NULL */
118 #define asn1_tlc_clear_nc(c) (c)->valid = 0
120 /* Decode an ASN1 item, this currently behaves just
121 * like a standard 'd2i' function. 'in' points to
122 * a buffer to read the data from, in future we will
123 * have more advanced versions that can input data
124 * a piece at a time and this will simply be a special
128 ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval,
129 const unsigned char **in, long len, const ASN1_ITEM *it)
132 ASN1_VALUE *ptmpval = NULL;
135 asn1_tlc_clear_nc(&c);
136 if (ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0)
141 int ASN1_template_d2i(ASN1_VALUE **pval,
142 const unsigned char **in, long len, const ASN1_TEMPLATE *tt)
145 asn1_tlc_clear_nc(&c);
146 return asn1_template_ex_d2i(pval, in, len, tt, 0, &c);
150 /* Decode an item, taking care of IMPLICIT tagging, if any.
151 * If 'opt' set and tag mismatch return -1 to handle OPTIONAL
154 int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len,
156 int tag, int aclass, char opt, ASN1_TLC *ctx)
158 const ASN1_TEMPLATE *tt, *errtt = NULL;
159 const ASN1_COMPAT_FUNCS *cf;
160 const ASN1_EXTERN_FUNCS *ef;
161 const ASN1_AUX *aux = it->funcs;
162 ASN1_aux_cb *asn1_cb;
163 const unsigned char *p = NULL, *q;
164 unsigned char *wp=NULL; /* BIG FAT WARNING! BREAKS CONST WHERE USED */
165 unsigned char imphack = 0, oclass;
166 char seq_eoc, seq_nolen, cst, isopt;
171 ASN1_VALUE *pchval, **pchptr, *ptmpval;
174 if (aux && aux->asn1_cb)
175 asn1_cb = aux->asn1_cb;
180 case ASN1_ITYPE_PRIMITIVE:
183 /* tagging or OPTIONAL is currently illegal on an item
184 * template because the flags can't get passed down.
185 * In practice this isn't a problem: we include the
186 * relevant flags from the item template in the
189 if ((tag != -1) || opt)
191 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
192 ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);
195 return asn1_template_ex_d2i(pval, in, len,
196 it->templates, opt, ctx);
198 return asn1_d2i_ex_primitive(pval, in, len, it,
199 tag, aclass, opt, ctx);
202 case ASN1_ITYPE_MSTRING:
204 /* Just read in tag and class */
205 ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL,
206 &p, len, -1, 0, 1, ctx);
209 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
210 ERR_R_NESTED_ASN1_ERROR);
214 /* Must be UNIVERSAL class */
215 if (oclass != V_ASN1_UNIVERSAL)
217 /* If OPTIONAL, assume this is OK */
219 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
220 ASN1_R_MSTRING_NOT_UNIVERSAL);
223 /* Check tag matches bit map */
224 if (!(ASN1_tag2bit(otag) & it->utype))
226 /* If OPTIONAL, assume this is OK */
229 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
230 ASN1_R_MSTRING_WRONG_TAG);
233 return asn1_d2i_ex_primitive(pval, in, len,
234 it, otag, 0, 0, ctx);
236 case ASN1_ITYPE_EXTERN:
237 /* Use new style d2i */
239 return ef->asn1_ex_d2i(pval, in, len,
240 it, tag, aclass, opt, ctx);
242 case ASN1_ITYPE_COMPAT:
243 /* we must resort to old style evil hackery */
246 /* If OPTIONAL see if it is there */
254 /* Don't care about anything other than presence
257 ret = asn1_check_tlen(NULL, NULL, NULL, NULL, NULL,
258 &p, len, exptag, aclass, 1, ctx);
261 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
262 ERR_R_NESTED_ASN1_ERROR);
269 /* This is the old style evil hack IMPLICIT handling:
270 * since the underlying code is expecting a tag and
271 * class other than the one present we change the
272 * buffer temporarily then change it back afterwards.
273 * This doesn't and never did work for tags > 30.
275 * Yes this is *horrible* but it is only needed for
276 * old style d2i which will hopefully not be around
278 * FIXME: should copy the buffer then modify it so
279 * the input buffer can be const: we should *always*
280 * copy because the old style d2i might modify the
286 wp = *(unsigned char **)in;
290 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
291 ERR_R_NESTED_ASN1_ERROR);
294 *wp = (unsigned char)((*p & V_ASN1_CONSTRUCTED)
298 ptmpval = cf->asn1_d2i(pval, in, len);
306 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
310 case ASN1_ITYPE_CHOICE:
311 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
314 /* Allocate structure */
315 if (!*pval && !ASN1_item_ex_new(pval, it))
317 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
318 ERR_R_NESTED_ASN1_ERROR);
321 /* CHOICE type, try each possibility in turn */
324 for (i = 0, tt=it->templates; i < it->tcount; i++, tt++)
326 pchptr = asn1_get_field_ptr(pval, tt);
327 /* We mark field as OPTIONAL so its absence
330 ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx);
331 /* If field not present, try the next one */
334 /* If positive return, read OK, break loop */
337 /* Otherwise must be an ASN1 parsing error */
339 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
340 ERR_R_NESTED_ASN1_ERROR);
344 /* Did we fall off the end without reading anything? */
347 /* If OPTIONAL, this is OK */
350 /* Free and zero it */
351 ASN1_item_ex_free(pval, it);
354 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
355 ASN1_R_NO_MATCHING_CHOICE_TYPE);
359 asn1_set_choice_selector(pval, i, it);
361 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
365 case ASN1_ITYPE_NDEF_SEQUENCE:
366 case ASN1_ITYPE_SEQUENCE:
370 /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
373 tag = V_ASN1_SEQUENCE;
374 aclass = V_ASN1_UNIVERSAL;
376 /* Get SEQUENCE length and update len, p */
377 ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst,
378 &p, len, tag, aclass, opt, ctx);
381 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
382 ERR_R_NESTED_ASN1_ERROR);
387 if (aux && (aux->flags & ASN1_AFLG_BROKEN))
389 len = tmplen - (p - *in);
392 /* If indefinite we don't do a length check */
393 else seq_nolen = seq_eoc;
396 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
397 ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
401 if (!*pval && !ASN1_item_ex_new(pval, it))
403 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
404 ERR_R_NESTED_ASN1_ERROR);
408 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
411 /* Get each field entry */
412 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++)
414 const ASN1_TEMPLATE *seqtt;
415 ASN1_VALUE **pseqval;
416 seqtt = asn1_do_adb(pval, tt, 1);
419 pseqval = asn1_get_field_ptr(pval, seqtt);
420 /* Have we ran out of data? */
424 if (asn1_check_eoc(&p, len))
428 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
429 ASN1_R_UNEXPECTED_EOC);
437 /* This determines the OPTIONAL flag value. The field
438 * cannot be omitted if it is the last of a SEQUENCE
439 * and there is still data to be read. This isn't
440 * strictly necessary but it increases efficiency in
443 if (i == (it->tcount - 1))
445 else isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
446 /* attempt to read in field, allowing each to be
449 ret = asn1_template_ex_d2i(pseqval, &p, len,
458 /* OPTIONAL component absent.
459 * Free and zero the field.
461 ASN1_template_free(pseqval, seqtt);
468 /* Check for EOC if expecting one */
469 if (seq_eoc && !asn1_check_eoc(&p, len))
471 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MISSING_EOC);
474 /* Check all data read */
475 if (!seq_nolen && len)
477 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
478 ASN1_R_SEQUENCE_LENGTH_MISMATCH);
482 /* If we get here we've got no more data in the SEQUENCE,
483 * however we may not have read all fields so check all
484 * remaining are OPTIONAL and clear any that are.
486 for (; i < it->tcount; tt++, i++)
488 const ASN1_TEMPLATE *seqtt;
489 seqtt = asn1_do_adb(pval, tt, 1);
492 if (seqtt->flags & ASN1_TFLG_OPTIONAL)
494 ASN1_VALUE **pseqval;
495 pseqval = asn1_get_field_ptr(pval, seqtt);
496 ASN1_template_free(pseqval, seqtt);
501 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
502 ASN1_R_FIELD_MISSING);
507 if (!asn1_enc_save(pval, *in, p - *in, it))
510 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
518 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_AUX_ERROR);
520 ASN1_item_ex_free(pval, it);
522 ERR_add_error_data(4, "Field=", errtt->field_name,
523 ", Type=", it->sname);
525 ERR_add_error_data(2, "Type=", it->sname);
529 /* Templates are handled with two separate functions.
530 * One handles any EXPLICIT tag and the other handles the rest.
533 static int asn1_template_ex_d2i(ASN1_VALUE **val,
534 const unsigned char **in, long inlen,
535 const ASN1_TEMPLATE *tt, char opt,
541 const unsigned char *p, *q;
546 aclass = flags & ASN1_TFLG_TAG_CLASS;
550 /* Check if EXPLICIT tag expected */
551 if (flags & ASN1_TFLG_EXPTAG)
554 /* Need to work out amount of data available to the inner
555 * content and where it starts: so read in EXPLICIT header to
558 ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst,
559 &p, inlen, tt->tag, aclass, opt, ctx);
563 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
564 ERR_R_NESTED_ASN1_ERROR);
571 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
572 ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);
575 /* We've found the field so it can't be OPTIONAL now */
576 ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx);
579 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
580 ERR_R_NESTED_ASN1_ERROR);
583 /* We read the field in OK so update length */
587 /* If NDEF we must have an EOC here */
588 if (!asn1_check_eoc(&p, len))
590 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
597 /* Otherwise we must hit the EXPLICIT tag end or its
601 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
602 ASN1_R_EXPLICIT_LENGTH_MISMATCH);
608 return asn1_template_noexp_d2i(val, in, inlen,
615 ASN1_template_free(val, tt);
620 static int asn1_template_noexp_d2i(ASN1_VALUE **val,
621 const unsigned char **in, long len,
622 const ASN1_TEMPLATE *tt, char opt,
627 const unsigned char *p, *q;
631 aclass = flags & ASN1_TFLG_TAG_CLASS;
636 if (flags & ASN1_TFLG_SK_MASK)
638 /* SET OF, SEQUENCE OF */
641 /* First work out expected inner tag value */
642 if (flags & ASN1_TFLG_IMPTAG)
649 skaclass = V_ASN1_UNIVERSAL;
650 if (flags & ASN1_TFLG_SET_OF)
653 sktag = V_ASN1_SEQUENCE;
656 ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL,
657 &p, len, sktag, skaclass, opt, ctx);
660 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
661 ERR_R_NESTED_ASN1_ERROR);
667 *val = (ASN1_VALUE *)sk_new_null();
670 /* We've got a valid STACK: free up any items present */
671 STACK *sktmp = (STACK *)*val;
673 while(sk_num(sktmp) > 0)
675 vtmp = (ASN1_VALUE *)sk_pop(sktmp);
676 ASN1_item_ex_free(&vtmp,
677 ASN1_ITEM_ptr(tt->item));
683 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
684 ERR_R_MALLOC_FAILURE);
688 /* Read as many items as we can */
693 /* See if EOC found */
694 if (asn1_check_eoc(&p, len))
698 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
699 ASN1_R_UNEXPECTED_EOC);
707 if (!ASN1_item_ex_d2i(&skfield, &p, len,
708 ASN1_ITEM_ptr(tt->item),
711 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
712 ERR_R_NESTED_ASN1_ERROR);
716 if (!sk_push((STACK *)*val, (char *)skfield))
718 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
719 ERR_R_MALLOC_FAILURE);
725 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ASN1_R_MISSING_EOC);
729 else if (flags & ASN1_TFLG_IMPTAG)
731 /* IMPLICIT tagging */
732 ret = ASN1_item_ex_d2i(val, &p, len,
733 ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt, ctx);
736 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
737 ERR_R_NESTED_ASN1_ERROR);
745 /* Nothing special */
746 ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item),
750 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
751 ERR_R_NESTED_ASN1_ERROR);
762 ASN1_template_free(val, tt);
767 static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
768 const unsigned char **in, long inlen,
770 int tag, int aclass, char opt, ASN1_TLC *ctx)
774 char cst, inf, free_cont = 0;
775 const unsigned char *p;
777 const unsigned char *cont = NULL;
781 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL);
782 return 0; /* Should never happen */
785 if (it->itype == ASN1_ITYPE_MSTRING)
793 if (utype == V_ASN1_ANY)
795 /* If type is ANY need to figure out type from tag */
796 unsigned char oclass;
799 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
800 ASN1_R_ILLEGAL_TAGGED_ANY);
805 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
806 ASN1_R_ILLEGAL_OPTIONAL_ANY);
810 ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL,
811 &p, inlen, -1, 0, 0, ctx);
814 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
815 ERR_R_NESTED_ASN1_ERROR);
818 if (oclass != V_ASN1_UNIVERSAL)
819 utype = V_ASN1_OTHER;
824 aclass = V_ASN1_UNIVERSAL;
828 ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst,
829 &p, inlen, tag, aclass, opt, ctx);
832 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
838 /* SEQUENCE, SET and "OTHER" are left in encoded form */
839 if ((utype == V_ASN1_SEQUENCE)
840 || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER))
842 /* Clear context cache for type OTHER because the auto clear
843 * when we have a exact match wont work
845 if (utype == V_ASN1_OTHER)
849 /* SEQUENCE and SET must be constructed */
852 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
853 ASN1_R_TYPE_NOT_CONSTRUCTED);
858 /* If indefinite length constructed find the real end */
861 if (!asn1_find_end(&p, plen, inf))
867 len = p - cont + plen;
877 /* Should really check the internal tags are correct but
878 * some things may get this wrong. The relevant specs
879 * say that constructed string types should be OCTET STRINGs
880 * internally irrespective of the type. So instead just check
881 * for UNIVERSAL class and ignore the tag.
883 if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL))
889 /* Append a final null to string */
890 if (!BUF_MEM_grow_clean(&buf, len + 1))
892 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
893 ERR_R_MALLOC_FAILURE);
897 cont = (const unsigned char *)buf.data;
907 /* We now have content length and type: translate into a structure */
908 if (!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it))
914 if (free_cont && buf.data) OPENSSL_free(buf.data);
918 /* Translate ASN1 content octets into a structure */
920 int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
921 int utype, char *free_cont, const ASN1_ITEM *it)
923 ASN1_VALUE **opval = NULL;
925 ASN1_TYPE *typ = NULL;
927 const ASN1_PRIMITIVE_FUNCS *pf;
931 if (pf && pf->prim_c2i)
932 return pf->prim_c2i(pval, cont, len, utype, free_cont, it);
933 /* If ANY type clear type and set pointer to internal value */
934 if (it->utype == V_ASN1_ANY)
938 typ = ASN1_TYPE_new();
941 *pval = (ASN1_VALUE *)typ;
944 typ = (ASN1_TYPE *)*pval;
946 if (utype != typ->type)
947 ASN1_TYPE_set(typ, utype, NULL);
949 pval = &typ->value.asn1_value;
954 if (!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len))
961 ASN1err(ASN1_F_ASN1_EX_C2I,
962 ASN1_R_NULL_IS_WRONG_LENGTH);
965 *pval = (ASN1_VALUE *)1;
971 ASN1err(ASN1_F_ASN1_EX_C2I,
972 ASN1_R_BOOLEAN_IS_WRONG_LENGTH);
978 tbool = (ASN1_BOOLEAN *)pval;
983 case V_ASN1_BIT_STRING:
984 if (!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len))
989 case V_ASN1_NEG_INTEGER:
990 case V_ASN1_ENUMERATED:
991 case V_ASN1_NEG_ENUMERATED:
992 tint = (ASN1_INTEGER **)pval;
993 if (!c2i_ASN1_INTEGER(tint, &cont, len))
995 /* Fixup type to match the expected form */
996 (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG);
999 case V_ASN1_OCTET_STRING:
1000 case V_ASN1_NUMERICSTRING:
1001 case V_ASN1_PRINTABLESTRING:
1002 case V_ASN1_T61STRING:
1003 case V_ASN1_VIDEOTEXSTRING:
1004 case V_ASN1_IA5STRING:
1005 case V_ASN1_UTCTIME:
1006 case V_ASN1_GENERALIZEDTIME:
1007 case V_ASN1_GRAPHICSTRING:
1008 case V_ASN1_VISIBLESTRING:
1009 case V_ASN1_GENERALSTRING:
1010 case V_ASN1_UNIVERSALSTRING:
1011 case V_ASN1_BMPSTRING:
1012 case V_ASN1_UTF8STRING:
1015 case V_ASN1_SEQUENCE:
1017 /* All based on ASN1_STRING and handled the same */
1020 stmp = ASN1_STRING_type_new(utype);
1023 ASN1err(ASN1_F_ASN1_EX_C2I,
1024 ERR_R_MALLOC_FAILURE);
1027 *pval = (ASN1_VALUE *)stmp;
1031 stmp = (ASN1_STRING *)*pval;
1034 /* If we've already allocated a buffer use it */
1038 OPENSSL_free(stmp->data);
1039 stmp->data = (unsigned char *)cont; /* UGLY CAST! RL */
1045 if (!ASN1_STRING_set(stmp, cont, len))
1047 ASN1err(ASN1_F_ASN1_EX_C2I,
1048 ERR_R_MALLOC_FAILURE);
1049 ASN1_STRING_free(stmp);
1056 /* If ASN1_ANY and NULL type fix up value */
1057 if (typ && (utype == V_ASN1_NULL))
1058 typ->value.ptr = NULL;
1064 ASN1_TYPE_free(typ);
1072 /* This function finds the end of an ASN1 structure when passed its maximum
1073 * length, whether it is indefinite length and a pointer to the content.
1074 * This is more efficient than calling asn1_collect because it does not
1075 * recurse on each indefinite length header.
1078 static int asn1_find_end(const unsigned char **in, long len, char inf)
1082 const unsigned char *p = *in, *q;
1083 /* If not indefinite length constructed just add length */
1090 /* Indefinite length constructed form. Find the end when enough EOCs
1091 * are found. If more indefinite length constructed headers
1092 * are encountered increment the expected eoc count otherwise just
1093 * skip to the end of the data.
1097 if(asn1_check_eoc(&p, len))
1100 if (expected_eoc == 0)
1106 /* Just read in a header: only care about the length */
1107 if(!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len,
1110 ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR);
1121 ASN1err(ASN1_F_ASN1_FIND_END, ASN1_R_MISSING_EOC);
1127 /* This function collects the asn1 data from a constructred string
1128 * type into a buffer. The values of 'in' and 'len' should refer
1129 * to the contents of the constructed type and 'inf' should be set
1130 * if it is indefinite length.
1133 static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
1134 char inf, int tag, int aclass)
1136 const unsigned char *p, *q;
1141 /* If no buffer and not indefinite length constructed just pass over
1142 * the encoded data */
1152 if (asn1_check_eoc(&p, len))
1154 /* EOC is illegal outside indefinite length
1155 * constructed form */
1158 ASN1err(ASN1_F_ASN1_COLLECT,
1159 ASN1_R_UNEXPECTED_EOC);
1166 if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p,
1167 len, tag, aclass, 0, NULL))
1169 ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR);
1173 /* If indefinite length constructed update max length */
1176 #ifdef OPENSSL_ALLOW_NESTED_ASN1_STRINGS
1177 if (!asn1_collect(buf, &p, plen, ininf, tag, aclass))
1180 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_NESTED_ASN1_STRING);
1184 else if (plen && !collect_data(buf, &p, plen))
1190 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC);
1197 static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen)
1203 if (!BUF_MEM_grow_clean(buf, len + plen))
1205 ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE);
1208 memcpy(buf->data + len, *p, plen);
1214 /* Check for ASN1 EOC and swallow it if found */
1216 static int asn1_check_eoc(const unsigned char **in, long len)
1218 const unsigned char *p;
1219 if (len < 2) return 0;
1229 /* Check an ASN1 tag and length: a bit like ASN1_get_object
1230 * but it sets the length for indefinite length constructed
1231 * form, we don't know the exact length but we can set an
1232 * upper bound to the amount of data available minus the
1233 * header length just read.
1236 static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
1237 char *inf, char *cst,
1238 const unsigned char **in, long len,
1239 int exptag, int expclass, char opt,
1245 const unsigned char *p, *q;
1249 if (ctx && ctx->valid)
1253 pclass = ctx->pclass;
1259 i = ASN1_get_object(&p, &plen, &ptag, &pclass, len);
1264 ctx->pclass = pclass;
1266 ctx->hdrlen = p - q;
1268 /* If definite length, and no error, length +
1269 * header can't exceed total amount of data available.
1271 if (!(i & 0x81) && ((plen + ctx->hdrlen) > len))
1273 ASN1err(ASN1_F_ASN1_CHECK_TLEN,
1275 asn1_tlc_clear(ctx);
1283 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER);
1284 asn1_tlc_clear(ctx);
1289 if ((exptag != ptag) || (expclass != pclass))
1291 /* If type is OPTIONAL, not an error:
1292 * indicate missing type.
1295 asn1_tlc_clear(ctx);
1296 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG);
1299 /* We have a tag and class match:
1300 * assume we are going to do something with it */
1301 asn1_tlc_clear(ctx);
1305 plen = len - (p - q);
1311 *cst = i & V_ASN1_CONSTRUCTED;