2 * Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
12 #include <openssl/asn1.h>
13 #include <openssl/asn1t.h>
14 #include <openssl/objects.h>
15 #include <openssl/buffer.h>
16 #include <openssl/err.h>
17 #include "asn1_locl.h"
19 static int asn1_item_embed_d2i(ASN1_VALUE **pval, const unsigned char **in,
20 long len, const ASN1_ITEM *it,
21 int tag, int aclass, char opt, ASN1_TLC *ctx);
23 static int asn1_check_eoc(const unsigned char **in, long len);
24 static int asn1_find_end(const unsigned char **in, long len, char inf);
26 static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
27 char inf, int tag, int aclass, int depth);
29 static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen);
31 static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
33 const unsigned char **in, long len,
34 int exptag, int expclass, char opt, ASN1_TLC *ctx);
36 static int asn1_template_ex_d2i(ASN1_VALUE **pval,
37 const unsigned char **in, long len,
38 const ASN1_TEMPLATE *tt, char opt,
40 static int asn1_template_noexp_d2i(ASN1_VALUE **val,
41 const unsigned char **in, long len,
42 const ASN1_TEMPLATE *tt, char opt,
44 static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
45 const unsigned char **in, long len,
47 int tag, int aclass, char opt,
49 static int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
50 int utype, char *free_cont, const ASN1_ITEM *it);
52 /* Table to convert tags to bit values, used for MSTRING type */
53 static const unsigned long tag2bit[32] = {
55 0, 0, 0, B_ASN1_BIT_STRING,
57 B_ASN1_OCTET_STRING, 0, 0, B_ASN1_UNKNOWN,
59 B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,
61 B_ASN1_UTF8STRING, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,
63 B_ASN1_SEQUENCE, 0, B_ASN1_NUMERICSTRING, B_ASN1_PRINTABLESTRING,
65 B_ASN1_T61STRING, B_ASN1_VIDEOTEXSTRING, B_ASN1_IA5STRING,
67 B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME,
69 B_ASN1_GRAPHICSTRING, B_ASN1_ISO64STRING, B_ASN1_GENERALSTRING,
71 B_ASN1_UNIVERSALSTRING, B_ASN1_UNKNOWN, B_ASN1_BMPSTRING, B_ASN1_UNKNOWN,
74 unsigned long ASN1_tag2bit(int tag)
76 if ((tag < 0) || (tag > 30))
81 /* Macro to initialize and invalidate the cache */
83 #define asn1_tlc_clear(c) if (c) (c)->valid = 0
84 /* Version to avoid compiler warning about 'c' always non-NULL */
85 #define asn1_tlc_clear_nc(c) (c)->valid = 0
88 * Decode an ASN1 item, this currently behaves just like a standard 'd2i'
89 * function. 'in' points to a buffer to read the data from, in future we
90 * will have more advanced versions that can input data a piece at a time and
91 * this will simply be a special case.
94 ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval,
95 const unsigned char **in, long len,
99 ASN1_VALUE *ptmpval = NULL;
102 asn1_tlc_clear_nc(&c);
103 if (ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0)
108 int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len,
110 int tag, int aclass, char opt, ASN1_TLC *ctx)
113 rv = asn1_item_embed_d2i(pval, in, len, it, tag, aclass, opt, ctx);
115 ASN1_item_ex_free(pval, it);
120 * Decode an item, taking care of IMPLICIT tagging, if any. If 'opt' set and
121 * tag mismatch return -1 to handle OPTIONAL
124 static int asn1_item_embed_d2i(ASN1_VALUE **pval, const unsigned char **in,
125 long len, const ASN1_ITEM *it,
126 int tag, int aclass, char opt, ASN1_TLC *ctx)
128 const ASN1_TEMPLATE *tt, *errtt = NULL;
129 const ASN1_EXTERN_FUNCS *ef;
130 const ASN1_AUX *aux = it->funcs;
131 ASN1_aux_cb *asn1_cb;
132 const unsigned char *p = NULL, *q;
133 unsigned char oclass;
134 char seq_eoc, seq_nolen, cst, isopt;
142 if (aux && aux->asn1_cb)
143 asn1_cb = aux->asn1_cb;
148 case ASN1_ITYPE_PRIMITIVE:
151 * tagging or OPTIONAL is currently illegal on an item template
152 * because the flags can't get passed down. In practice this
153 * isn't a problem: we include the relevant flags from the item
154 * template in the template itself.
156 if ((tag != -1) || opt) {
157 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I,
158 ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);
161 return asn1_template_ex_d2i(pval, in, len,
162 it->templates, opt, ctx);
164 return asn1_d2i_ex_primitive(pval, in, len, it,
165 tag, aclass, opt, ctx);
167 case ASN1_ITYPE_MSTRING:
169 /* Just read in tag and class */
170 ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL,
171 &p, len, -1, 0, 1, ctx);
173 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ERR_R_NESTED_ASN1_ERROR);
177 /* Must be UNIVERSAL class */
178 if (oclass != V_ASN1_UNIVERSAL) {
179 /* If OPTIONAL, assume this is OK */
182 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_MSTRING_NOT_UNIVERSAL);
185 /* Check tag matches bit map */
186 if (!(ASN1_tag2bit(otag) & it->utype)) {
187 /* If OPTIONAL, assume this is OK */
190 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_MSTRING_WRONG_TAG);
193 return asn1_d2i_ex_primitive(pval, in, len, it, otag, 0, 0, ctx);
195 case ASN1_ITYPE_EXTERN:
196 /* Use new style d2i */
198 return ef->asn1_ex_d2i(pval, in, len, it, tag, aclass, opt, ctx);
200 case ASN1_ITYPE_CHOICE:
201 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
204 /* Free up and zero CHOICE value if initialised */
205 i = asn1_get_choice_selector(pval, it);
206 if ((i >= 0) && (i < it->tcount)) {
207 tt = it->templates + i;
208 pchptr = asn1_get_field_ptr(pval, tt);
209 asn1_template_free(pchptr, tt);
210 asn1_set_choice_selector(pval, -1, it);
212 } else if (!ASN1_item_ex_new(pval, it)) {
213 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ERR_R_NESTED_ASN1_ERROR);
216 /* CHOICE type, try each possibility in turn */
218 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
219 pchptr = asn1_get_field_ptr(pval, tt);
221 * We mark field as OPTIONAL so its absence can be recognised.
223 ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx);
224 /* If field not present, try the next one */
228 * Set the choice selector here to ensure that the value is
229 * correctly freed upon error. It may be partially initialized
230 * even if parsing failed.
232 asn1_set_choice_selector(pval, i, it);
233 /* If positive return, read OK, break loop */
236 /* Otherwise must be an ASN1 parsing error */
238 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ERR_R_NESTED_ASN1_ERROR);
242 /* Did we fall off the end without reading anything? */
243 if (i == it->tcount) {
244 /* If OPTIONAL, this is OK */
246 /* Free and zero it */
247 ASN1_item_ex_free(pval, it);
250 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_NO_MATCHING_CHOICE_TYPE);
254 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
259 case ASN1_ITYPE_NDEF_SEQUENCE:
260 case ASN1_ITYPE_SEQUENCE:
264 /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
266 tag = V_ASN1_SEQUENCE;
267 aclass = V_ASN1_UNIVERSAL;
269 /* Get SEQUENCE length and update len, p */
270 ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst,
271 &p, len, tag, aclass, opt, ctx);
273 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ERR_R_NESTED_ASN1_ERROR);
275 } else if (ret == -1)
277 if (aux && (aux->flags & ASN1_AFLG_BROKEN)) {
278 len = tmplen - (p - *in);
281 /* If indefinite we don't do a length check */
285 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
289 if (!*pval && !ASN1_item_ex_new(pval, it)) {
290 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ERR_R_NESTED_ASN1_ERROR);
294 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
297 /* Free up and zero any ADB found */
298 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
299 if (tt->flags & ASN1_TFLG_ADB_MASK) {
300 const ASN1_TEMPLATE *seqtt;
301 ASN1_VALUE **pseqval;
302 seqtt = asn1_do_adb(pval, tt, 1);
303 pseqval = asn1_get_field_ptr(pval, seqtt);
304 asn1_template_free(pseqval, seqtt);
308 /* Get each field entry */
309 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
310 const ASN1_TEMPLATE *seqtt;
311 ASN1_VALUE **pseqval;
312 seqtt = asn1_do_adb(pval, tt, 1);
315 pseqval = asn1_get_field_ptr(pval, seqtt);
316 /* Have we ran out of data? */
320 if (asn1_check_eoc(&p, len)) {
322 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_UNEXPECTED_EOC);
331 * This determines the OPTIONAL flag value. The field cannot be
332 * omitted if it is the last of a SEQUENCE and there is still
333 * data to be read. This isn't strictly necessary but it
334 * increases efficiency in some cases.
336 if (i == (it->tcount - 1))
339 isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
341 * attempt to read in field, allowing each to be OPTIONAL
344 ret = asn1_template_ex_d2i(pseqval, &p, len, seqtt, isopt, ctx);
348 } else if (ret == -1) {
350 * OPTIONAL component absent. Free and zero the field.
352 asn1_template_free(pseqval, seqtt);
359 /* Check for EOC if expecting one */
360 if (seq_eoc && !asn1_check_eoc(&p, len)) {
361 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_MISSING_EOC);
364 /* Check all data read */
365 if (!seq_nolen && len) {
366 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_SEQUENCE_LENGTH_MISMATCH);
371 * If we get here we've got no more data in the SEQUENCE, however we
372 * may not have read all fields so check all remaining are OPTIONAL
373 * and clear any that are.
375 for (; i < it->tcount; tt++, i++) {
376 const ASN1_TEMPLATE *seqtt;
377 seqtt = asn1_do_adb(pval, tt, 1);
380 if (seqtt->flags & ASN1_TFLG_OPTIONAL) {
381 ASN1_VALUE **pseqval;
382 pseqval = asn1_get_field_ptr(pval, seqtt);
383 asn1_template_free(pseqval, seqtt);
386 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_FIELD_MISSING);
391 if (!asn1_enc_save(pval, *in, p - *in, it))
393 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
402 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_AUX_ERROR);
405 ERR_add_error_data(4, "Field=", errtt->field_name,
406 ", Type=", it->sname);
408 ERR_add_error_data(2, "Type=", it->sname);
413 * Templates are handled with two separate functions. One handles any
414 * EXPLICIT tag and the other handles the rest.
417 static int asn1_template_ex_d2i(ASN1_VALUE **val,
418 const unsigned char **in, long inlen,
419 const ASN1_TEMPLATE *tt, char opt,
425 const unsigned char *p, *q;
430 aclass = flags & ASN1_TFLG_TAG_CLASS;
434 /* Check if EXPLICIT tag expected */
435 if (flags & ASN1_TFLG_EXPTAG) {
438 * Need to work out amount of data available to the inner content and
439 * where it starts: so read in EXPLICIT header to get the info.
441 ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst,
442 &p, inlen, tt->tag, aclass, opt, ctx);
445 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
447 } else if (ret == -1)
450 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
451 ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);
454 /* We've found the field so it can't be OPTIONAL now */
455 ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx);
457 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
460 /* We read the field in OK so update length */
463 /* If NDEF we must have an EOC here */
464 if (!asn1_check_eoc(&p, len)) {
465 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ASN1_R_MISSING_EOC);
470 * Otherwise we must hit the EXPLICIT tag end or its an error
473 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
474 ASN1_R_EXPLICIT_LENGTH_MISMATCH);
479 return asn1_template_noexp_d2i(val, in, inlen, tt, opt, ctx);
488 static int asn1_template_noexp_d2i(ASN1_VALUE **val,
489 const unsigned char **in, long len,
490 const ASN1_TEMPLATE *tt, char opt,
496 const unsigned char *p, *q;
500 aclass = flags & ASN1_TFLG_TAG_CLASS;
506 * If field is embedded then val needs fixing so it is a pointer to
507 * a pointer to a field.
509 if (tt->flags & ASN1_TFLG_EMBED) {
510 tval = (ASN1_VALUE *)val;
514 if (flags & ASN1_TFLG_SK_MASK) {
515 /* SET OF, SEQUENCE OF */
518 /* First work out expected inner tag value */
519 if (flags & ASN1_TFLG_IMPTAG) {
523 skaclass = V_ASN1_UNIVERSAL;
524 if (flags & ASN1_TFLG_SET_OF)
527 sktag = V_ASN1_SEQUENCE;
530 ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL,
531 &p, len, sktag, skaclass, opt, ctx);
533 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR);
535 } else if (ret == -1)
538 *val = (ASN1_VALUE *)sk_new_null();
541 * We've got a valid STACK: free up any items present
543 STACK_OF(ASN1_VALUE) *sktmp = (STACK_OF(ASN1_VALUE) *)*val;
545 while (sk_ASN1_VALUE_num(sktmp) > 0) {
546 vtmp = sk_ASN1_VALUE_pop(sktmp);
547 ASN1_item_ex_free(&vtmp, ASN1_ITEM_ptr(tt->item));
552 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_MALLOC_FAILURE);
556 /* Read as many items as we can */
560 /* See if EOC found */
561 if (asn1_check_eoc(&p, len)) {
563 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
564 ASN1_R_UNEXPECTED_EOC);
572 if (!asn1_item_embed_d2i(&skfield, &p, len,
573 ASN1_ITEM_ptr(tt->item), -1, 0, 0, ctx)) {
574 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
575 ERR_R_NESTED_ASN1_ERROR);
576 /* |skfield| may be partially allocated despite failure. */
577 ASN1_item_free(skfield, ASN1_ITEM_ptr(tt->item));
581 if (!sk_ASN1_VALUE_push((STACK_OF(ASN1_VALUE) *)*val, skfield)) {
582 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_MALLOC_FAILURE);
583 ASN1_item_free(skfield, ASN1_ITEM_ptr(tt->item));
588 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ASN1_R_MISSING_EOC);
591 } else if (flags & ASN1_TFLG_IMPTAG) {
592 /* IMPLICIT tagging */
593 ret = asn1_item_embed_d2i(val, &p, len,
594 ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt,
597 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR);
599 } else if (ret == -1)
602 /* Nothing special */
603 ret = asn1_item_embed_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item),
606 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR);
608 } else if (ret == -1)
619 static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
620 const unsigned char **in, long inlen,
622 int tag, int aclass, char opt, ASN1_TLC *ctx)
626 char cst, inf, free_cont = 0;
627 const unsigned char *p;
628 BUF_MEM buf = { 0, NULL, 0, 0 };
629 const unsigned char *cont = NULL;
632 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL);
633 return 0; /* Should never happen */
636 if (it->itype == ASN1_ITYPE_MSTRING) {
642 if (utype == V_ASN1_ANY) {
643 /* If type is ANY need to figure out type from tag */
644 unsigned char oclass;
646 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_TAGGED_ANY);
650 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
651 ASN1_R_ILLEGAL_OPTIONAL_ANY);
655 ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL,
656 &p, inlen, -1, 0, 0, ctx);
658 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
661 if (oclass != V_ASN1_UNIVERSAL)
662 utype = V_ASN1_OTHER;
666 aclass = V_ASN1_UNIVERSAL;
670 ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst,
671 &p, inlen, tag, aclass, opt, ctx);
673 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
675 } else if (ret == -1)
678 /* SEQUENCE, SET and "OTHER" are left in encoded form */
679 if ((utype == V_ASN1_SEQUENCE)
680 || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER)) {
682 * Clear context cache for type OTHER because the auto clear when we
683 * have a exact match wont work
685 if (utype == V_ASN1_OTHER) {
688 /* SEQUENCE and SET must be constructed */
690 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
691 ASN1_R_TYPE_NOT_CONSTRUCTED);
696 /* If indefinite length constructed find the real end */
698 if (!asn1_find_end(&p, plen, inf))
702 len = p - cont + plen;
706 if (utype == V_ASN1_NULL || utype == V_ASN1_BOOLEAN
707 || utype == V_ASN1_OBJECT || utype == V_ASN1_INTEGER
708 || utype == V_ASN1_ENUMERATED) {
709 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_TYPE_NOT_PRIMITIVE);
713 /* Free any returned 'buf' content */
716 * Should really check the internal tags are correct but some things
717 * may get this wrong. The relevant specs say that constructed string
718 * types should be OCTET STRINGs internally irrespective of the type.
719 * So instead just check for UNIVERSAL class and ignore the tag.
721 if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL, 0)) {
725 /* Append a final null to string */
726 if (!BUF_MEM_grow_clean(&buf, len + 1)) {
727 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE);
731 cont = (const unsigned char *)buf.data;
738 /* We now have content length and type: translate into a structure */
739 /* asn1_ex_c2i may reuse allocated buffer, and so sets free_cont to 0 */
740 if (!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it))
747 OPENSSL_free(buf.data);
751 /* Translate ASN1 content octets into a structure */
753 static int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
754 int utype, char *free_cont, const ASN1_ITEM *it)
756 ASN1_VALUE **opval = NULL;
758 ASN1_TYPE *typ = NULL;
760 const ASN1_PRIMITIVE_FUNCS *pf;
764 if (pf && pf->prim_c2i)
765 return pf->prim_c2i(pval, cont, len, utype, free_cont, it);
766 /* If ANY type clear type and set pointer to internal value */
767 if (it->utype == V_ASN1_ANY) {
769 typ = ASN1_TYPE_new();
772 *pval = (ASN1_VALUE *)typ;
774 typ = (ASN1_TYPE *)*pval;
776 if (utype != typ->type)
777 ASN1_TYPE_set(typ, utype, NULL);
779 pval = &typ->value.asn1_value;
783 if (!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len))
789 ASN1err(ASN1_F_ASN1_EX_C2I, ASN1_R_NULL_IS_WRONG_LENGTH);
792 *pval = (ASN1_VALUE *)1;
797 ASN1err(ASN1_F_ASN1_EX_C2I, ASN1_R_BOOLEAN_IS_WRONG_LENGTH);
801 tbool = (ASN1_BOOLEAN *)pval;
806 case V_ASN1_BIT_STRING:
807 if (!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len))
812 case V_ASN1_ENUMERATED:
813 tint = (ASN1_INTEGER **)pval;
814 if (!c2i_ASN1_INTEGER(tint, &cont, len))
816 /* Fixup type to match the expected form */
817 (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG);
820 case V_ASN1_OCTET_STRING:
821 case V_ASN1_NUMERICSTRING:
822 case V_ASN1_PRINTABLESTRING:
823 case V_ASN1_T61STRING:
824 case V_ASN1_VIDEOTEXSTRING:
825 case V_ASN1_IA5STRING:
827 case V_ASN1_GENERALIZEDTIME:
828 case V_ASN1_GRAPHICSTRING:
829 case V_ASN1_VISIBLESTRING:
830 case V_ASN1_GENERALSTRING:
831 case V_ASN1_UNIVERSALSTRING:
832 case V_ASN1_BMPSTRING:
833 case V_ASN1_UTF8STRING:
836 case V_ASN1_SEQUENCE:
838 if (utype == V_ASN1_BMPSTRING && (len & 1)) {
839 ASN1err(ASN1_F_ASN1_EX_C2I, ASN1_R_BMPSTRING_IS_WRONG_LENGTH);
842 if (utype == V_ASN1_UNIVERSALSTRING && (len & 3)) {
843 ASN1err(ASN1_F_ASN1_EX_C2I,
844 ASN1_R_UNIVERSALSTRING_IS_WRONG_LENGTH);
847 /* All based on ASN1_STRING and handled the same */
849 stmp = ASN1_STRING_type_new(utype);
851 ASN1err(ASN1_F_ASN1_EX_C2I, ERR_R_MALLOC_FAILURE);
854 *pval = (ASN1_VALUE *)stmp;
856 stmp = (ASN1_STRING *)*pval;
859 /* If we've already allocated a buffer use it */
861 OPENSSL_free(stmp->data);
862 stmp->data = (unsigned char *)cont; /* UGLY CAST! RL */
866 if (!ASN1_STRING_set(stmp, cont, len)) {
867 ASN1err(ASN1_F_ASN1_EX_C2I, ERR_R_MALLOC_FAILURE);
868 ASN1_STRING_free(stmp);
875 /* If ASN1_ANY and NULL type fix up value */
876 if (typ && (utype == V_ASN1_NULL))
877 typ->value.ptr = NULL;
890 * This function finds the end of an ASN1 structure when passed its maximum
891 * length, whether it is indefinite length and a pointer to the content. This
892 * is more efficient than calling asn1_collect because it does not recurse on
893 * each indefinite length header.
896 static int asn1_find_end(const unsigned char **in, long len, char inf)
900 const unsigned char *p = *in, *q;
901 /* If not indefinite length constructed just add length */
908 * Indefinite length constructed form. Find the end when enough EOCs are
909 * found. If more indefinite length constructed headers are encountered
910 * increment the expected eoc count otherwise just skip to the end of the
914 if (asn1_check_eoc(&p, len)) {
916 if (expected_eoc == 0)
922 /* Just read in a header: only care about the length */
923 if (!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len,
925 ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR);
935 ASN1err(ASN1_F_ASN1_FIND_END, ASN1_R_MISSING_EOC);
943 * This function collects the asn1 data from a constructed string type into
944 * a buffer. The values of 'in' and 'len' should refer to the contents of the
945 * constructed type and 'inf' should be set if it is indefinite length.
948 #ifndef ASN1_MAX_STRING_NEST
950 * This determines how many levels of recursion are permitted in ASN1 string
951 * types. If it is not limited stack overflows can occur. If set to zero no
952 * recursion is allowed at all. Although zero should be adequate examples
953 * exist that require a value of 1. So 5 should be more than enough.
955 # define ASN1_MAX_STRING_NEST 5
958 static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
959 char inf, int tag, int aclass, int depth)
961 const unsigned char *p, *q;
967 * If no buffer and not indefinite length constructed just pass over the
977 if (asn1_check_eoc(&p, len)) {
979 * EOC is illegal outside indefinite length constructed form
982 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_UNEXPECTED_EOC);
989 if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p,
990 len, tag, aclass, 0, NULL)) {
991 ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR);
995 /* If indefinite length constructed update max length */
997 if (depth >= ASN1_MAX_STRING_NEST) {
998 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_NESTED_ASN1_STRING);
1001 if (!asn1_collect(buf, &p, plen, ininf, tag, aclass, depth + 1))
1003 } else if (plen && !collect_data(buf, &p, plen))
1008 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC);
1015 static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen)
1020 if (!BUF_MEM_grow_clean(buf, len + plen)) {
1021 ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE);
1024 memcpy(buf->data + len, *p, plen);
1030 /* Check for ASN1 EOC and swallow it if found */
1032 static int asn1_check_eoc(const unsigned char **in, long len)
1034 const unsigned char *p;
1038 if (!p[0] && !p[1]) {
1046 * Check an ASN1 tag and length: a bit like ASN1_get_object but it sets the
1047 * length for indefinite length constructed form, we don't know the exact
1048 * length but we can set an upper bound to the amount of data available minus
1049 * the header length just read.
1052 static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
1053 char *inf, char *cst,
1054 const unsigned char **in, long len,
1055 int exptag, int expclass, char opt, ASN1_TLC *ctx)
1060 const unsigned char *p, *q;
1064 if (ctx && ctx->valid) {
1067 pclass = ctx->pclass;
1071 i = ASN1_get_object(&p, &plen, &ptag, &pclass, len);
1075 ctx->pclass = pclass;
1077 ctx->hdrlen = p - q;
1080 * If definite length, and no error, length + header can't exceed
1081 * total amount of data available.
1083 if (!(i & 0x81) && ((plen + ctx->hdrlen) > len)) {
1084 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_TOO_LONG);
1085 asn1_tlc_clear(ctx);
1092 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER);
1093 asn1_tlc_clear(ctx);
1097 if ((exptag != ptag) || (expclass != pclass)) {
1099 * If type is OPTIONAL, not an error: indicate missing type.
1103 asn1_tlc_clear(ctx);
1104 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG);
1108 * We have a tag and class match: assume we are going to do something
1111 asn1_tlc_clear(ctx);
1115 plen = len - (p - q);
1121 *cst = i & V_ASN1_CONSTRUCTED;