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;
170 int combine = aclass & ASN1_TFLG_COMBINE;
171 aclass &= ~ASN1_TFLG_COMBINE;
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))
315 /* Free up and zero CHOICE value if initialised */
316 i = asn1_get_choice_selector(pval, it);
317 if ((i >= 0) && (i < it->tcount)) {
318 tt = it->templates + i;
319 pchptr = asn1_get_field_ptr(pval, tt);
320 ASN1_template_free(pchptr, tt);
321 asn1_set_choice_selector(pval, -1, it);
323 } else if (!ASN1_item_ex_new(pval, it)) {
324 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
325 ERR_R_NESTED_ASN1_ERROR);
328 /* CHOICE type, try each possibility in turn */
330 for (i = 0, tt=it->templates; i < it->tcount; i++, tt++)
332 pchptr = asn1_get_field_ptr(pval, tt);
333 /* We mark field as OPTIONAL so its absence
336 ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx);
337 /* If field not present, try the next one */
340 /* If positive return, read OK, break loop */
343 /* Otherwise must be an ASN1 parsing error */
345 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
346 ERR_R_NESTED_ASN1_ERROR);
350 /* Did we fall off the end without reading anything? */
353 /* If OPTIONAL, this is OK */
356 /* Free and zero it */
357 ASN1_item_ex_free(pval, it);
360 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
361 ASN1_R_NO_MATCHING_CHOICE_TYPE);
365 asn1_set_choice_selector(pval, i, it);
367 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))
371 case ASN1_ITYPE_NDEF_SEQUENCE:
372 case ASN1_ITYPE_SEQUENCE:
376 /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
379 tag = V_ASN1_SEQUENCE;
380 aclass = V_ASN1_UNIVERSAL;
382 /* Get SEQUENCE length and update len, p */
383 ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst,
384 &p, len, tag, aclass, opt, ctx);
387 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
388 ERR_R_NESTED_ASN1_ERROR);
393 if (aux && (aux->flags & ASN1_AFLG_BROKEN))
395 len = tmplen - (p - *in);
398 /* If indefinite we don't do a length check */
399 else seq_nolen = seq_eoc;
402 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
403 ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
407 if (!*pval && !ASN1_item_ex_new(pval, it))
409 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
410 ERR_R_NESTED_ASN1_ERROR);
414 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))
417 /* Free up and zero any ADB found */
418 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
419 if (tt->flags & ASN1_TFLG_ADB_MASK) {
420 const ASN1_TEMPLATE *seqtt;
421 ASN1_VALUE **pseqval;
422 seqtt = asn1_do_adb(pval, tt, 1);
423 pseqval = asn1_get_field_ptr(pval, seqtt);
424 ASN1_template_free(pseqval, seqtt);
428 /* Get each field entry */
429 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++)
431 const ASN1_TEMPLATE *seqtt;
432 ASN1_VALUE **pseqval;
433 seqtt = asn1_do_adb(pval, tt, 1);
436 pseqval = asn1_get_field_ptr(pval, seqtt);
437 /* Have we ran out of data? */
441 if (asn1_check_eoc(&p, len))
445 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
446 ASN1_R_UNEXPECTED_EOC);
454 /* This determines the OPTIONAL flag value. The field
455 * cannot be omitted if it is the last of a SEQUENCE
456 * and there is still data to be read. This isn't
457 * strictly necessary but it increases efficiency in
460 if (i == (it->tcount - 1))
462 else isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
463 /* attempt to read in field, allowing each to be
466 ret = asn1_template_ex_d2i(pseqval, &p, len,
475 /* OPTIONAL component absent.
476 * Free and zero the field.
478 ASN1_template_free(pseqval, seqtt);
485 /* Check for EOC if expecting one */
486 if (seq_eoc && !asn1_check_eoc(&p, len))
488 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MISSING_EOC);
491 /* Check all data read */
492 if (!seq_nolen && len)
494 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
495 ASN1_R_SEQUENCE_LENGTH_MISMATCH);
499 /* If we get here we've got no more data in the SEQUENCE,
500 * however we may not have read all fields so check all
501 * remaining are OPTIONAL and clear any that are.
503 for (; i < it->tcount; tt++, i++)
505 const ASN1_TEMPLATE *seqtt;
506 seqtt = asn1_do_adb(pval, tt, 1);
509 if (seqtt->flags & ASN1_TFLG_OPTIONAL)
511 ASN1_VALUE **pseqval;
512 pseqval = asn1_get_field_ptr(pval, seqtt);
513 ASN1_template_free(pseqval, seqtt);
518 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
519 ASN1_R_FIELD_MISSING);
524 if (!asn1_enc_save(pval, *in, p - *in, it))
527 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))
535 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_AUX_ERROR);
538 ASN1_item_ex_free(pval, it);
540 ERR_add_error_data(4, "Field=", errtt->field_name,
541 ", Type=", it->sname);
543 ERR_add_error_data(2, "Type=", it->sname);
547 /* Templates are handled with two separate functions.
548 * One handles any EXPLICIT tag and the other handles the rest.
551 static int asn1_template_ex_d2i(ASN1_VALUE **val,
552 const unsigned char **in, long inlen,
553 const ASN1_TEMPLATE *tt, char opt,
559 const unsigned char *p, *q;
564 aclass = flags & ASN1_TFLG_TAG_CLASS;
568 /* Check if EXPLICIT tag expected */
569 if (flags & ASN1_TFLG_EXPTAG)
572 /* Need to work out amount of data available to the inner
573 * content and where it starts: so read in EXPLICIT header to
576 ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst,
577 &p, inlen, tt->tag, aclass, opt, ctx);
581 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
582 ERR_R_NESTED_ASN1_ERROR);
589 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
590 ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);
593 /* We've found the field so it can't be OPTIONAL now */
594 ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx);
597 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
598 ERR_R_NESTED_ASN1_ERROR);
601 /* We read the field in OK so update length */
605 /* If NDEF we must have an EOC here */
606 if (!asn1_check_eoc(&p, len))
608 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
615 /* Otherwise we must hit the EXPLICIT tag end or its
619 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
620 ASN1_R_EXPLICIT_LENGTH_MISMATCH);
626 return asn1_template_noexp_d2i(val, in, inlen,
633 ASN1_template_free(val, tt);
637 static int asn1_template_noexp_d2i(ASN1_VALUE **val,
638 const unsigned char **in, long len,
639 const ASN1_TEMPLATE *tt, char opt,
644 const unsigned char *p, *q;
648 aclass = flags & ASN1_TFLG_TAG_CLASS;
653 if (flags & ASN1_TFLG_SK_MASK)
655 /* SET OF, SEQUENCE OF */
658 /* First work out expected inner tag value */
659 if (flags & ASN1_TFLG_IMPTAG)
666 skaclass = V_ASN1_UNIVERSAL;
667 if (flags & ASN1_TFLG_SET_OF)
670 sktag = V_ASN1_SEQUENCE;
673 ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL,
674 &p, len, sktag, skaclass, opt, ctx);
677 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
678 ERR_R_NESTED_ASN1_ERROR);
684 *val = (ASN1_VALUE *)sk_new_null();
687 /* We've got a valid STACK: free up any items present */
688 STACK *sktmp = (STACK *)*val;
690 while(sk_num(sktmp) > 0)
692 vtmp = (ASN1_VALUE *)sk_pop(sktmp);
693 ASN1_item_ex_free(&vtmp,
694 ASN1_ITEM_ptr(tt->item));
700 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
701 ERR_R_MALLOC_FAILURE);
705 /* Read as many items as we can */
710 /* See if EOC found */
711 if (asn1_check_eoc(&p, len))
715 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
716 ASN1_R_UNEXPECTED_EOC);
724 if (!ASN1_item_ex_d2i(&skfield, &p, len,
725 ASN1_ITEM_ptr(tt->item),
728 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
729 ERR_R_NESTED_ASN1_ERROR);
733 if (!sk_push((STACK *)*val, (char *)skfield))
735 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
736 ERR_R_MALLOC_FAILURE);
742 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ASN1_R_MISSING_EOC);
746 else if (flags & ASN1_TFLG_IMPTAG)
748 /* IMPLICIT tagging */
749 ret = ASN1_item_ex_d2i(val, &p, len,
750 ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt, ctx);
753 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
754 ERR_R_NESTED_ASN1_ERROR);
762 /* Nothing special */
763 ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item),
764 -1, tt->flags & ASN1_TFLG_COMBINE, opt, ctx);
767 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
768 ERR_R_NESTED_ASN1_ERROR);
779 ASN1_template_free(val, tt);
783 static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
784 const unsigned char **in, long inlen,
786 int tag, int aclass, char opt, ASN1_TLC *ctx)
790 char cst, inf, free_cont = 0;
791 const unsigned char *p;
793 const unsigned char *cont = NULL;
797 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL);
798 return 0; /* Should never happen */
801 if (it->itype == ASN1_ITYPE_MSTRING)
809 if (utype == V_ASN1_ANY)
811 /* If type is ANY need to figure out type from tag */
812 unsigned char oclass;
815 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
816 ASN1_R_ILLEGAL_TAGGED_ANY);
821 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
822 ASN1_R_ILLEGAL_OPTIONAL_ANY);
826 ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL,
827 &p, inlen, -1, 0, 0, ctx);
830 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
831 ERR_R_NESTED_ASN1_ERROR);
834 if (oclass != V_ASN1_UNIVERSAL)
835 utype = V_ASN1_OTHER;
840 aclass = V_ASN1_UNIVERSAL;
844 ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst,
845 &p, inlen, tag, aclass, opt, ctx);
848 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
854 /* SEQUENCE, SET and "OTHER" are left in encoded form */
855 if ((utype == V_ASN1_SEQUENCE)
856 || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER))
858 /* Clear context cache for type OTHER because the auto clear
859 * when we have a exact match wont work
861 if (utype == V_ASN1_OTHER)
865 /* SEQUENCE and SET must be constructed */
868 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
869 ASN1_R_TYPE_NOT_CONSTRUCTED);
874 /* If indefinite length constructed find the real end */
877 if (!asn1_find_end(&p, plen, inf))
883 len = p - cont + plen;
890 if (utype == V_ASN1_NULL || utype == V_ASN1_BOOLEAN
891 || utype == V_ASN1_OBJECT || utype == V_ASN1_INTEGER
892 || utype == V_ASN1_ENUMERATED)
894 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
895 ASN1_R_TYPE_NOT_PRIMITIVE);
901 /* Should really check the internal tags are correct but
902 * some things may get this wrong. The relevant specs
903 * say that constructed string types should be OCTET STRINGs
904 * internally irrespective of the type. So instead just check
905 * for UNIVERSAL class and ignore the tag.
907 if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL, 0))
913 /* Append a final null to string */
914 if (!BUF_MEM_grow_clean(&buf, len + 1))
916 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
917 ERR_R_MALLOC_FAILURE);
921 cont = (const unsigned char *)buf.data;
931 /* We now have content length and type: translate into a structure */
932 if (!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it))
938 if (free_cont && buf.data) OPENSSL_free(buf.data);
942 /* Translate ASN1 content octets into a structure */
944 int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
945 int utype, char *free_cont, const ASN1_ITEM *it)
947 ASN1_VALUE **opval = NULL;
949 ASN1_TYPE *typ = NULL;
951 const ASN1_PRIMITIVE_FUNCS *pf;
955 if (pf && pf->prim_c2i)
956 return pf->prim_c2i(pval, cont, len, utype, free_cont, it);
957 /* If ANY type clear type and set pointer to internal value */
958 if (it->utype == V_ASN1_ANY)
962 typ = ASN1_TYPE_new();
965 *pval = (ASN1_VALUE *)typ;
968 typ = (ASN1_TYPE *)*pval;
970 if (utype != typ->type)
971 ASN1_TYPE_set(typ, utype, NULL);
973 pval = &typ->value.asn1_value;
978 if (!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len))
985 ASN1err(ASN1_F_ASN1_EX_C2I,
986 ASN1_R_NULL_IS_WRONG_LENGTH);
989 *pval = (ASN1_VALUE *)1;
995 ASN1err(ASN1_F_ASN1_EX_C2I,
996 ASN1_R_BOOLEAN_IS_WRONG_LENGTH);
1001 ASN1_BOOLEAN *tbool;
1002 tbool = (ASN1_BOOLEAN *)pval;
1007 case V_ASN1_BIT_STRING:
1008 if (!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len))
1012 case V_ASN1_INTEGER:
1013 case V_ASN1_NEG_INTEGER:
1014 case V_ASN1_ENUMERATED:
1015 case V_ASN1_NEG_ENUMERATED:
1016 tint = (ASN1_INTEGER **)pval;
1017 if (!c2i_ASN1_INTEGER(tint, &cont, len))
1019 /* Fixup type to match the expected form */
1020 (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG);
1023 case V_ASN1_OCTET_STRING:
1024 case V_ASN1_NUMERICSTRING:
1025 case V_ASN1_PRINTABLESTRING:
1026 case V_ASN1_T61STRING:
1027 case V_ASN1_VIDEOTEXSTRING:
1028 case V_ASN1_IA5STRING:
1029 case V_ASN1_UTCTIME:
1030 case V_ASN1_GENERALIZEDTIME:
1031 case V_ASN1_GRAPHICSTRING:
1032 case V_ASN1_VISIBLESTRING:
1033 case V_ASN1_GENERALSTRING:
1034 case V_ASN1_UNIVERSALSTRING:
1035 case V_ASN1_BMPSTRING:
1036 case V_ASN1_UTF8STRING:
1039 case V_ASN1_SEQUENCE:
1041 if (utype == V_ASN1_BMPSTRING && (len & 1))
1043 ASN1err(ASN1_F_ASN1_EX_C2I,
1044 ASN1_R_BMPSTRING_IS_WRONG_LENGTH);
1047 if (utype == V_ASN1_UNIVERSALSTRING && (len & 3))
1049 ASN1err(ASN1_F_ASN1_EX_C2I,
1050 ASN1_R_UNIVERSALSTRING_IS_WRONG_LENGTH);
1053 /* All based on ASN1_STRING and handled the same */
1056 stmp = ASN1_STRING_type_new(utype);
1059 ASN1err(ASN1_F_ASN1_EX_C2I,
1060 ERR_R_MALLOC_FAILURE);
1063 *pval = (ASN1_VALUE *)stmp;
1067 stmp = (ASN1_STRING *)*pval;
1070 /* If we've already allocated a buffer use it */
1074 OPENSSL_free(stmp->data);
1075 stmp->data = (unsigned char *)cont; /* UGLY CAST! RL */
1081 if (!ASN1_STRING_set(stmp, cont, len))
1083 ASN1err(ASN1_F_ASN1_EX_C2I,
1084 ERR_R_MALLOC_FAILURE);
1085 ASN1_STRING_free(stmp);
1092 /* If ASN1_ANY and NULL type fix up value */
1093 if (typ && (utype == V_ASN1_NULL))
1094 typ->value.ptr = NULL;
1100 ASN1_TYPE_free(typ);
1108 /* This function finds the end of an ASN1 structure when passed its maximum
1109 * length, whether it is indefinite length and a pointer to the content.
1110 * This is more efficient than calling asn1_collect because it does not
1111 * recurse on each indefinite length header.
1114 static int asn1_find_end(const unsigned char **in, long len, char inf)
1118 const unsigned char *p = *in, *q;
1119 /* If not indefinite length constructed just add length */
1126 /* Indefinite length constructed form. Find the end when enough EOCs
1127 * are found. If more indefinite length constructed headers
1128 * are encountered increment the expected eoc count otherwise just
1129 * skip to the end of the data.
1133 if(asn1_check_eoc(&p, len))
1136 if (expected_eoc == 0)
1142 /* Just read in a header: only care about the length */
1143 if(!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len,
1146 ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR);
1157 ASN1err(ASN1_F_ASN1_FIND_END, ASN1_R_MISSING_EOC);
1163 /* This function collects the asn1 data from a constructred string
1164 * type into a buffer. The values of 'in' and 'len' should refer
1165 * to the contents of the constructed type and 'inf' should be set
1166 * if it is indefinite length.
1169 #ifndef ASN1_MAX_STRING_NEST
1170 /* This determines how many levels of recursion are permitted in ASN1
1171 * string types. If it is not limited stack overflows can occur. If set
1172 * to zero no recursion is allowed at all. Although zero should be adequate
1173 * examples exist that require a value of 1. So 5 should be more than enough.
1175 #define ASN1_MAX_STRING_NEST 5
1179 static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
1180 char inf, int tag, int aclass, int depth)
1182 const unsigned char *p, *q;
1187 /* If no buffer and not indefinite length constructed just pass over
1188 * the encoded data */
1198 if (asn1_check_eoc(&p, len))
1200 /* EOC is illegal outside indefinite length
1201 * constructed form */
1204 ASN1err(ASN1_F_ASN1_COLLECT,
1205 ASN1_R_UNEXPECTED_EOC);
1212 if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p,
1213 len, tag, aclass, 0, NULL))
1215 ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR);
1219 /* If indefinite length constructed update max length */
1222 if (depth >= ASN1_MAX_STRING_NEST)
1224 ASN1err(ASN1_F_ASN1_COLLECT,
1225 ASN1_R_NESTED_ASN1_STRING);
1228 if (!asn1_collect(buf, &p, plen, ininf, tag, aclass,
1232 else if (plen && !collect_data(buf, &p, plen))
1238 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC);
1245 static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen)
1251 if (!BUF_MEM_grow_clean(buf, len + plen))
1253 ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE);
1256 memcpy(buf->data + len, *p, plen);
1262 /* Check for ASN1 EOC and swallow it if found */
1264 static int asn1_check_eoc(const unsigned char **in, long len)
1266 const unsigned char *p;
1267 if (len < 2) return 0;
1277 /* Check an ASN1 tag and length: a bit like ASN1_get_object
1278 * but it sets the length for indefinite length constructed
1279 * form, we don't know the exact length but we can set an
1280 * upper bound to the amount of data available minus the
1281 * header length just read.
1284 static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
1285 char *inf, char *cst,
1286 const unsigned char **in, long len,
1287 int exptag, int expclass, char opt,
1293 const unsigned char *p, *q;
1297 if (ctx && ctx->valid)
1301 pclass = ctx->pclass;
1307 i = ASN1_get_object(&p, &plen, &ptag, &pclass, len);
1312 ctx->pclass = pclass;
1314 ctx->hdrlen = p - q;
1316 /* If definite length, and no error, length +
1317 * header can't exceed total amount of data available.
1319 if (!(i & 0x81) && ((plen + ctx->hdrlen) > len))
1321 ASN1err(ASN1_F_ASN1_CHECK_TLEN,
1323 asn1_tlc_clear(ctx);
1331 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER);
1332 asn1_tlc_clear(ctx);
1337 if ((exptag != ptag) || (expclass != pclass))
1339 /* If type is OPTIONAL, not an error:
1340 * indicate missing type.
1343 asn1_tlc_clear(ctx);
1344 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG);
1347 /* We have a tag and class match:
1348 * assume we are going to do something with it */
1349 asn1_tlc_clear(ctx);
1353 plen = len - (p - q);
1359 *cst = i & V_ASN1_CONSTRUCTED;