1021 lines
29 KiB
C
1021 lines
29 KiB
C
/* tasn_dec.c */
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/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
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* project 2000.
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*/
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/* ====================================================================
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* Copyright (c) 2000 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <stddef.h>
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#include <string.h>
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#include <openssl/asn1.h>
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#include <openssl/asn1t.h>
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#include <openssl/objects.h>
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#include <openssl/buffer.h>
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#include <openssl/err.h>
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static int asn1_check_eoc(unsigned char **in, long len);
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static int asn1_find_end(unsigned char **in, long len, char inf);
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static int asn1_collect(BUF_MEM *buf, unsigned char **in, long len, char inf, int tag, int aclass);
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static int collect_data(BUF_MEM *buf, unsigned char **p, long plen);
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static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass, char *inf, char *cst,
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unsigned char **in, long len, int exptag, int expclass, char opt, ASN1_TLC *ctx);
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static int asn1_template_ex_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx);
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static int asn1_template_noexp_d2i(ASN1_VALUE **val, unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx);
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static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, unsigned char **in, long len,
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const ASN1_ITEM *it, int tag, int aclass, char opt, ASN1_TLC *ctx);
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/* Table to convert tags to bit values, used for MSTRING type */
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static unsigned long tag2bit[32]={
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0, 0, 0, B_ASN1_BIT_STRING, /* tags 0 - 3 */
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B_ASN1_OCTET_STRING, 0, 0, B_ASN1_UNKNOWN,/* tags 4- 7 */
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B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,/* tags 8-11 */
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B_ASN1_UTF8STRING,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,/* tags 12-15 */
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0, 0, B_ASN1_NUMERICSTRING,B_ASN1_PRINTABLESTRING, /* tags 16-19 */
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B_ASN1_T61STRING,B_ASN1_VIDEOTEXSTRING,B_ASN1_IA5STRING, /* tags 20-22 */
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B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME, /* tags 23-24 */
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B_ASN1_GRAPHICSTRING,B_ASN1_ISO64STRING,B_ASN1_GENERALSTRING, /* tags 25-27 */
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B_ASN1_UNIVERSALSTRING,B_ASN1_UNKNOWN,B_ASN1_BMPSTRING,B_ASN1_UNKNOWN, /* tags 28-31 */
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};
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unsigned long ASN1_tag2bit(int tag)
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{
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if((tag < 0) || (tag > 30)) return 0;
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return tag2bit[tag];
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}
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/* Macro to initialize and invalidate the cache */
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#define asn1_tlc_clear(c) if(c) (c)->valid = 0
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/* Decode an ASN1 item, this currently behaves just
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* like a standard 'd2i' function. 'in' points to
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* a buffer to read the data from, in future we will
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* have more advanced versions that can input data
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* a piece at a time and this will simply be a special
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* case.
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*/
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ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_ITEM *it)
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{
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ASN1_TLC c;
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ASN1_VALUE *ptmpval = NULL;
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if(!pval) pval = &ptmpval;
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asn1_tlc_clear(&c);
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if(ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0)
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return *pval;
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return NULL;
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}
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int ASN1_template_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_TEMPLATE *tt)
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{
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ASN1_TLC c;
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asn1_tlc_clear(&c);
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return asn1_template_ex_d2i(pval, in, len, tt, 0, &c);
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}
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/* Decode an item, taking care of IMPLICIT tagging, if any.
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* If 'opt' set and tag mismatch return -1 to handle OPTIONAL
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*/
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int ASN1_item_ex_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_ITEM *it,
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int tag, int aclass, char opt, ASN1_TLC *ctx)
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{
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const ASN1_TEMPLATE *tt, *errtt = NULL;
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const ASN1_COMPAT_FUNCS *cf;
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const ASN1_EXTERN_FUNCS *ef;
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const ASN1_AUX *aux = it->funcs;
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ASN1_aux_cb *asn1_cb;
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unsigned char *p, *q, imphack = 0, oclass;
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char seq_eoc, seq_nolen, cst, isopt;
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long tmplen;
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int i;
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int otag;
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int ret = 0;
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ASN1_VALUE *pchval, **pchptr, *ptmpval;
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if(!pval) return 0;
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if(aux && aux->asn1_cb) asn1_cb = aux->asn1_cb;
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else asn1_cb = 0;
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switch(it->itype) {
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case ASN1_ITYPE_PRIMITIVE:
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if(it->templates) {
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/* tagging or OPTIONAL is currently illegal on an item template
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* because the flags can't get passed down. In practice this isn't
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* a problem: we include the relevant flags from the item template
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* in the template itself.
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*/
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if ((tag != -1) || opt) {
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ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);
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goto err;
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}
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return asn1_template_ex_d2i(pval, in, len, it->templates, opt, ctx);
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}
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return asn1_d2i_ex_primitive(pval, in, len, it, tag, aclass, opt, ctx);
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break;
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case ASN1_ITYPE_MSTRING:
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p = *in;
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/* Just read in tag and class */
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ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL, &p, len, -1, 0, 1, ctx);
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if(!ret) {
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ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
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goto err;
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}
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/* Must be UNIVERSAL class */
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if(oclass != V_ASN1_UNIVERSAL) {
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/* If OPTIONAL, assume this is OK */
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if(opt) return -1;
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ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MSTRING_NOT_UNIVERSAL);
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goto err;
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}
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/* Check tag matches bit map */
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if(!(ASN1_tag2bit(otag) & it->utype)) {
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/* If OPTIONAL, assume this is OK */
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if(opt) return -1;
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ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MSTRING_WRONG_TAG);
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goto err;
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}
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return asn1_d2i_ex_primitive(pval, in, len, it, otag, 0, 0, ctx);
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case ASN1_ITYPE_EXTERN:
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/* Use new style d2i */
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ef = it->funcs;
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return ef->asn1_ex_d2i(pval, in, len, it, tag, aclass, opt, ctx);
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case ASN1_ITYPE_COMPAT:
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/* we must resort to old style evil hackery */
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cf = it->funcs;
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/* If OPTIONAL see if it is there */
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if(opt) {
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int exptag;
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p = *in;
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if(tag == -1) exptag = it->utype;
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else exptag = tag;
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/* Don't care about anything other than presence of expected tag */
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ret = asn1_check_tlen(NULL, NULL, NULL, NULL, NULL, &p, len, exptag, aclass, 1, ctx);
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if(!ret) {
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ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
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goto err;
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}
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if(ret == -1) return -1;
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}
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/* This is the old style evil hack IMPLICIT handling:
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* since the underlying code is expecting a tag and
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* class other than the one present we change the
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* buffer temporarily then change it back afterwards.
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* This doesn't and never did work for tags > 30.
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*
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* Yes this is *horrible* but it is only needed for
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* old style d2i which will hopefully not be around
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* for much longer.
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* FIXME: should copy the buffer then modify it so
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* the input buffer can be const: we should *always*
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* copy because the old style d2i might modify the
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* buffer.
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*/
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if(tag != -1) {
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p = *in;
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imphack = *p;
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*p = (unsigned char)((*p & V_ASN1_CONSTRUCTED) | it->utype);
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}
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ptmpval = cf->asn1_d2i(pval, in, len);
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if(tag != -1) *p = imphack;
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if(ptmpval) return 1;
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ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
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goto err;
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case ASN1_ITYPE_CHOICE:
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if(asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))
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goto auxerr;
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/* Allocate structure */
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if(!*pval) {
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if(!ASN1_item_ex_new(pval, it)) {
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ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
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goto err;
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}
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}
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/* CHOICE type, try each possibility in turn */
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pchval = NULL;
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p = *in;
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for(i = 0, tt=it->templates; i < it->tcount; i++, tt++) {
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pchptr = asn1_get_field_ptr(pval, tt);
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/* We mark field as OPTIONAL so its absence
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* can be recognised.
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*/
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ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx);
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/* If field not present, try the next one */
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if(ret == -1) continue;
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/* If positive return, read OK, break loop */
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if(ret > 0) break;
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/* Otherwise must be an ASN1 parsing error */
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errtt = tt;
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ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
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goto err;
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}
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/* Did we fall off the end without reading anything? */
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if(i == it->tcount) {
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/* If OPTIONAL, this is OK */
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if(opt) {
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/* Free and zero it */
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ASN1_item_ex_free(pval, it);
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return -1;
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}
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ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_NO_MATCHING_CHOICE_TYPE);
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goto err;
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}
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asn1_set_choice_selector(pval, i, it);
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*in = p;
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if(asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))
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goto auxerr;
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return 1;
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case ASN1_ITYPE_SEQUENCE:
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p = *in;
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tmplen = len;
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/* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
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if(tag == -1) {
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tag = V_ASN1_SEQUENCE;
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aclass = V_ASN1_UNIVERSAL;
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}
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/* Get SEQUENCE length and update len, p */
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ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst, &p, len, tag, aclass, opt, ctx);
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if(!ret) {
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ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
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goto err;
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} else if(ret == -1) return -1;
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if(aux && (aux->flags & ASN1_AFLG_BROKEN)) {
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len = tmplen - (p - *in);
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seq_nolen = 1;
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} else seq_nolen = seq_eoc; /* If indefinite we don't do a length check */
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if(!cst) {
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ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
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goto err;
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}
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if(!*pval) {
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if(!ASN1_item_ex_new(pval, it)) {
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ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
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goto err;
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}
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}
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if(asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))
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goto auxerr;
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/* Get each field entry */
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for(i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
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const ASN1_TEMPLATE *seqtt;
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ASN1_VALUE **pseqval;
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seqtt = asn1_do_adb(pval, tt, 1);
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if(!seqtt) goto err;
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pseqval = asn1_get_field_ptr(pval, seqtt);
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/* Have we ran out of data? */
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if(!len) break;
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q = p;
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if(asn1_check_eoc(&p, len)) {
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if(!seq_eoc) {
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ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_UNEXPECTED_EOC);
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goto err;
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}
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len -= p - q;
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seq_eoc = 0;
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q = p;
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break;
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}
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/* This determines the OPTIONAL flag value. The field cannot
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* be omitted if it is the last of a SEQUENCE and there is
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* still data to be read. This isn't strictly necessary but
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* it increases efficiency in some cases.
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*/
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if(i == (it->tcount - 1)) isopt = 0;
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else isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
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/* attempt to read in field, allowing each to be OPTIONAL */
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ret = asn1_template_ex_d2i(pseqval, &p, len, seqtt, isopt, ctx);
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if(!ret) {
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errtt = seqtt;
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goto err;
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} else if(ret == -1) {
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/* OPTIONAL component absent. Free and zero the field
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*/
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ASN1_template_free(pseqval, seqtt);
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continue;
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}
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/* Update length */
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len -= p - q;
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}
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/* Check for EOC if expecting one */
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if(seq_eoc && !asn1_check_eoc(&p, len)) {
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ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MISSING_EOC);
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goto err;
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}
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/* Check all data read */
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if(!seq_nolen && len) {
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ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_SEQUENCE_LENGTH_MISMATCH);
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goto err;
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}
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/* If we get here we've got no more data in the SEQUENCE,
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* however we may not have read all fields so check all
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* remaining are OPTIONAL and clear any that are.
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*/
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for(; i < it->tcount; tt++, i++) {
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const ASN1_TEMPLATE *seqtt;
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seqtt = asn1_do_adb(pval, tt, 1);
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if(!seqtt) goto err;
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if(seqtt->flags & ASN1_TFLG_OPTIONAL) {
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ASN1_VALUE **pseqval;
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pseqval = asn1_get_field_ptr(pval, seqtt);
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ASN1_template_free(pseqval, seqtt);
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} else {
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errtt = seqtt;
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ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_FIELD_MISSING);
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goto err;
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}
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}
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/* Save encoding */
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if(!asn1_enc_save(pval, *in, p - *in, it)) goto auxerr;
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*in = p;
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if(asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))
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goto auxerr;
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return 1;
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default:
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return 0;
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}
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auxerr:
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ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_AUX_ERROR);
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err:
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ASN1_item_ex_free(pval, it);
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if(errtt) ERR_add_error_data(4, "Field=", errtt->field_name, ", Type=", it->sname);
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else ERR_add_error_data(2, "Type=", it->sname);
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return 0;
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}
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/* Templates are handled with two separate functions. One handles any EXPLICIT tag and the other handles the
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* rest.
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*/
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static int asn1_template_ex_d2i(ASN1_VALUE **val, unsigned char **in, long inlen, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx)
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{
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int flags, aclass;
|
|
int ret;
|
|
long len;
|
|
unsigned char *p, *q;
|
|
char exp_eoc;
|
|
if(!val) return 0;
|
|
flags = tt->flags;
|
|
aclass = flags & ASN1_TFLG_TAG_CLASS;
|
|
|
|
p = *in;
|
|
|
|
/* Check if EXPLICIT tag expected */
|
|
if(flags & ASN1_TFLG_EXPTAG) {
|
|
char cst;
|
|
/* Need to work out amount of data available to the inner content and where it
|
|
* starts: so read in EXPLICIT header to get the info.
|
|
*/
|
|
ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst, &p, inlen, tt->tag, aclass, opt, ctx);
|
|
q = p;
|
|
if(!ret) {
|
|
ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
|
|
return 0;
|
|
} else if(ret == -1) return -1;
|
|
if(!cst) {
|
|
ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);
|
|
return 0;
|
|
}
|
|
/* We've found the field so it can't be OPTIONAL now */
|
|
ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx);
|
|
if(!ret) {
|
|
ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
|
|
return 0;
|
|
}
|
|
/* We read the field in OK so update length */
|
|
len -= p - q;
|
|
if(exp_eoc) {
|
|
/* If NDEF we must have an EOC here */
|
|
if(!asn1_check_eoc(&p, len)) {
|
|
ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ASN1_R_MISSING_EOC);
|
|
goto err;
|
|
}
|
|
} else {
|
|
/* Otherwise we must hit the EXPLICIT tag end or its an error */
|
|
if(len) {
|
|
ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ASN1_R_EXPLICIT_LENGTH_MISMATCH);
|
|
goto err;
|
|
}
|
|
}
|
|
} else
|
|
return asn1_template_noexp_d2i(val, in, inlen, tt, opt, ctx);
|
|
|
|
*in = p;
|
|
return 1;
|
|
|
|
err:
|
|
ASN1_template_free(val, tt);
|
|
*val = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static int asn1_template_noexp_d2i(ASN1_VALUE **val, unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx)
|
|
{
|
|
int flags, aclass;
|
|
int ret;
|
|
unsigned char *p, *q;
|
|
if(!val) return 0;
|
|
flags = tt->flags;
|
|
aclass = flags & ASN1_TFLG_TAG_CLASS;
|
|
|
|
p = *in;
|
|
q = p;
|
|
|
|
if(flags & ASN1_TFLG_SK_MASK) {
|
|
/* SET OF, SEQUENCE OF */
|
|
int sktag, skaclass;
|
|
char sk_eoc;
|
|
/* First work out expected inner tag value */
|
|
if(flags & ASN1_TFLG_IMPTAG) {
|
|
sktag = tt->tag;
|
|
skaclass = aclass;
|
|
} else {
|
|
skaclass = V_ASN1_UNIVERSAL;
|
|
if(flags & ASN1_TFLG_SET_OF) sktag = V_ASN1_SET;
|
|
else sktag = V_ASN1_SEQUENCE;
|
|
}
|
|
/* Get the tag */
|
|
ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL, &p, len, sktag, skaclass, opt, ctx);
|
|
if(!ret) {
|
|
ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
|
|
return 0;
|
|
} else if(ret == -1) return -1;
|
|
if(!*val) *val = (ASN1_VALUE *)sk_new_null();
|
|
else {
|
|
/* We've got a valid STACK: free up any items present */
|
|
STACK *sktmp = (STACK *)*val;
|
|
ASN1_VALUE *vtmp;
|
|
while(sk_num(sktmp) > 0) {
|
|
vtmp = (ASN1_VALUE *)sk_pop(sktmp);
|
|
ASN1_item_ex_free(&vtmp, ASN1_ITEM_ptr(tt->item));
|
|
}
|
|
}
|
|
|
|
if(!*val) {
|
|
ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
/* Read as many items as we can */
|
|
while(len > 0) {
|
|
ASN1_VALUE *skfield;
|
|
q = p;
|
|
/* See if EOC found */
|
|
if(asn1_check_eoc(&p, len)) {
|
|
if(!sk_eoc) {
|
|
ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ASN1_R_UNEXPECTED_EOC);
|
|
goto err;
|
|
}
|
|
len -= p - q;
|
|
sk_eoc = 0;
|
|
break;
|
|
}
|
|
skfield = NULL;
|
|
if(!ASN1_item_ex_d2i(&skfield, &p, len, ASN1_ITEM_ptr(tt->item), -1, 0, 0, ctx)) {
|
|
ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ERR_R_NESTED_ASN1_ERROR);
|
|
goto err;
|
|
}
|
|
len -= p - q;
|
|
if(!sk_push((STACK *)*val, (char *)skfield)) {
|
|
ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
}
|
|
if(sk_eoc) {
|
|
ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ASN1_R_MISSING_EOC);
|
|
goto err;
|
|
}
|
|
} else if(flags & ASN1_TFLG_IMPTAG) {
|
|
/* IMPLICIT tagging */
|
|
ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt, ctx);
|
|
if(!ret) {
|
|
ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ERR_R_NESTED_ASN1_ERROR);
|
|
goto err;
|
|
} else if(ret == -1) return -1;
|
|
} else {
|
|
/* Nothing special */
|
|
ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item), -1, 0, opt, ctx);
|
|
if(!ret) {
|
|
ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ERR_R_NESTED_ASN1_ERROR);
|
|
goto err;
|
|
} else if(ret == -1) return -1;
|
|
}
|
|
|
|
*in = p;
|
|
return 1;
|
|
|
|
err:
|
|
ASN1_template_free(val, tt);
|
|
*val = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, unsigned char **in, long inlen,
|
|
const ASN1_ITEM *it,
|
|
int tag, int aclass, char opt, ASN1_TLC *ctx)
|
|
{
|
|
int ret = 0, utype;
|
|
long plen;
|
|
char cst, inf, free_cont = 0;
|
|
unsigned char *p;
|
|
BUF_MEM buf;
|
|
unsigned char *cont = NULL;
|
|
long len;
|
|
if(!pval) {
|
|
ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL);
|
|
return 0; /* Should never happen */
|
|
}
|
|
|
|
if(it->itype == ASN1_ITYPE_MSTRING) {
|
|
utype = tag;
|
|
tag = -1;
|
|
} else utype = it->utype;
|
|
|
|
if(utype == V_ASN1_ANY) {
|
|
/* If type is ANY need to figure out type from tag */
|
|
unsigned char oclass;
|
|
if(tag >= 0) {
|
|
ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_TAGGED_ANY);
|
|
return 0;
|
|
}
|
|
if(opt) {
|
|
ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_OPTIONAL_ANY);
|
|
return 0;
|
|
}
|
|
p = *in;
|
|
ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL, &p, inlen, -1, 0, 0, ctx);
|
|
if(!ret) {
|
|
ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
|
|
return 0;
|
|
}
|
|
if(oclass != V_ASN1_UNIVERSAL) utype = V_ASN1_OTHER;
|
|
}
|
|
if(tag == -1) {
|
|
tag = utype;
|
|
aclass = V_ASN1_UNIVERSAL;
|
|
}
|
|
p = *in;
|
|
/* Check header */
|
|
ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst, &p, inlen, tag, aclass, opt, ctx);
|
|
if(!ret) {
|
|
ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
|
|
return 0;
|
|
} else if(ret == -1) return -1;
|
|
/* SEQUENCE, SET and "OTHER" are left in encoded form */
|
|
if((utype == V_ASN1_SEQUENCE) || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER)) {
|
|
/* Clear context cache for type OTHER because the auto clear when
|
|
* we have a exact match wont work
|
|
*/
|
|
if(utype == V_ASN1_OTHER) {
|
|
asn1_tlc_clear(ctx);
|
|
/* SEQUENCE and SET must be constructed */
|
|
} else if(!cst) {
|
|
ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_TYPE_NOT_CONSTRUCTED);
|
|
return 0;
|
|
}
|
|
|
|
cont = *in;
|
|
/* If indefinite length constructed find the real end */
|
|
if(inf) {
|
|
if(!asn1_find_end(&p, plen, inf)) goto err;
|
|
len = p - cont;
|
|
} else {
|
|
len = p - cont + plen;
|
|
p += plen;
|
|
buf.data = NULL;
|
|
}
|
|
} else if(cst) {
|
|
buf.length = 0;
|
|
buf.max = 0;
|
|
buf.data = NULL;
|
|
/* Should really check the internal tags are correct but
|
|
* some things may get this wrong. The relevant specs
|
|
* say that constructed string types should be OCTET STRINGs
|
|
* internally irrespective of the type. So instead just check
|
|
* for UNIVERSAL class and ignore the tag.
|
|
*/
|
|
if(!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL)) goto err;
|
|
len = buf.length;
|
|
/* Append a final null to string */
|
|
if(!BUF_MEM_grow_clean(&buf, len + 1)) {
|
|
ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE);
|
|
return 0;
|
|
}
|
|
buf.data[len] = 0;
|
|
cont = (unsigned char *)buf.data;
|
|
free_cont = 1;
|
|
} else {
|
|
cont = p;
|
|
len = plen;
|
|
p += plen;
|
|
}
|
|
|
|
/* We now have content length and type: translate into a structure */
|
|
if(!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it)) goto err;
|
|
|
|
*in = p;
|
|
ret = 1;
|
|
err:
|
|
if(free_cont && buf.data) OPENSSL_free(buf.data);
|
|
return ret;
|
|
}
|
|
|
|
/* Translate ASN1 content octets into a structure */
|
|
|
|
int asn1_ex_c2i(ASN1_VALUE **pval, unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it)
|
|
{
|
|
ASN1_VALUE **opval = NULL;
|
|
ASN1_STRING *stmp;
|
|
ASN1_TYPE *typ = NULL;
|
|
int ret = 0;
|
|
const ASN1_PRIMITIVE_FUNCS *pf;
|
|
ASN1_INTEGER **tint;
|
|
pf = it->funcs;
|
|
if(pf && pf->prim_c2i) return pf->prim_c2i(pval, cont, len, utype, free_cont, it);
|
|
/* If ANY type clear type and set pointer to internal value */
|
|
if(it->utype == V_ASN1_ANY) {
|
|
if(!*pval) {
|
|
typ = ASN1_TYPE_new();
|
|
*pval = (ASN1_VALUE *)typ;
|
|
} else typ = (ASN1_TYPE *)*pval;
|
|
if(utype != typ->type) ASN1_TYPE_set(typ, utype, NULL);
|
|
opval = pval;
|
|
pval = (ASN1_VALUE **)&typ->value.ptr;
|
|
}
|
|
switch(utype) {
|
|
case V_ASN1_OBJECT:
|
|
if(!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len)) goto err;
|
|
break;
|
|
|
|
case V_ASN1_NULL:
|
|
if(len) {
|
|
ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_NULL_IS_WRONG_LENGTH);
|
|
goto err;
|
|
}
|
|
*pval = (ASN1_VALUE *)1;
|
|
break;
|
|
|
|
case V_ASN1_BOOLEAN:
|
|
if(len != 1) {
|
|
ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_BOOLEAN_IS_WRONG_LENGTH);
|
|
goto err;
|
|
} else {
|
|
ASN1_BOOLEAN *tbool;
|
|
tbool = (ASN1_BOOLEAN *)pval;
|
|
*tbool = *cont;
|
|
}
|
|
break;
|
|
|
|
case V_ASN1_BIT_STRING:
|
|
if(!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len)) goto err;
|
|
break;
|
|
|
|
case V_ASN1_INTEGER:
|
|
case V_ASN1_NEG_INTEGER:
|
|
case V_ASN1_ENUMERATED:
|
|
case V_ASN1_NEG_ENUMERATED:
|
|
tint = (ASN1_INTEGER **)pval;
|
|
if(!c2i_ASN1_INTEGER(tint, &cont, len)) goto err;
|
|
/* Fixup type to match the expected form */
|
|
(*tint)->type = utype | ((*tint)->type & V_ASN1_NEG);
|
|
break;
|
|
|
|
case V_ASN1_OCTET_STRING:
|
|
case V_ASN1_NUMERICSTRING:
|
|
case V_ASN1_PRINTABLESTRING:
|
|
case V_ASN1_T61STRING:
|
|
case V_ASN1_VIDEOTEXSTRING:
|
|
case V_ASN1_IA5STRING:
|
|
case V_ASN1_UTCTIME:
|
|
case V_ASN1_GENERALIZEDTIME:
|
|
case V_ASN1_GRAPHICSTRING:
|
|
case V_ASN1_VISIBLESTRING:
|
|
case V_ASN1_GENERALSTRING:
|
|
case V_ASN1_UNIVERSALSTRING:
|
|
case V_ASN1_BMPSTRING:
|
|
case V_ASN1_UTF8STRING:
|
|
case V_ASN1_OTHER:
|
|
case V_ASN1_SET:
|
|
case V_ASN1_SEQUENCE:
|
|
default:
|
|
/* All based on ASN1_STRING and handled the same */
|
|
if(!*pval) {
|
|
stmp = ASN1_STRING_type_new(utype);
|
|
if(!stmp) {
|
|
ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
*pval = (ASN1_VALUE *)stmp;
|
|
} else {
|
|
stmp = (ASN1_STRING *)*pval;
|
|
stmp->type = utype;
|
|
}
|
|
/* If we've already allocated a buffer use it */
|
|
if(*free_cont) {
|
|
if(stmp->data) OPENSSL_free(stmp->data);
|
|
stmp->data = cont;
|
|
stmp->length = len;
|
|
*free_cont = 0;
|
|
} else {
|
|
if(!ASN1_STRING_set(stmp, cont, len)) {
|
|
ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE);
|
|
ASN1_STRING_free(stmp);
|
|
*pval = NULL;
|
|
goto err;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
/* If ASN1_ANY and NULL type fix up value */
|
|
if(typ && utype==V_ASN1_NULL) typ->value.ptr = NULL;
|
|
|
|
ret = 1;
|
|
err:
|
|
if(!ret)
|
|
{
|
|
ASN1_TYPE_free(typ);
|
|
if (opval)
|
|
*opval = NULL;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* This function finds the end of an ASN1 structure when passed its maximum
|
|
* length, whether it is indefinite length and a pointer to the content.
|
|
* This is more efficient than calling asn1_collect because it does not
|
|
* recurse on each indefinite length header.
|
|
*/
|
|
|
|
static int asn1_find_end(unsigned char **in, long len, char inf)
|
|
{
|
|
int expected_eoc;
|
|
long plen;
|
|
unsigned char *p = *in, *q;
|
|
/* If not indefinite length constructed just add length */
|
|
if (inf == 0)
|
|
{
|
|
*in += len;
|
|
return 1;
|
|
}
|
|
expected_eoc = 1;
|
|
/* Indefinite length constructed form. Find the end when enough EOCs
|
|
* are found. If more indefinite length constructed headers
|
|
* are encountered increment the expected eoc count otherwise justi
|
|
* skip to the end of the data.
|
|
*/
|
|
while (len > 0)
|
|
{
|
|
if(asn1_check_eoc(&p, len))
|
|
{
|
|
expected_eoc--;
|
|
if (expected_eoc == 0)
|
|
break;
|
|
len -= 2;
|
|
continue;
|
|
}
|
|
q = p;
|
|
/* Just read in a header: only care about the length */
|
|
if(!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len,
|
|
-1, 0, 0, NULL))
|
|
{
|
|
ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR);
|
|
return 0;
|
|
}
|
|
if (inf)
|
|
expected_eoc++;
|
|
else
|
|
p += plen;
|
|
len -= p - q;
|
|
}
|
|
if (expected_eoc)
|
|
{
|
|
ASN1err(ASN1_F_ASN1_FIND_END, ASN1_R_MISSING_EOC);
|
|
return 0;
|
|
}
|
|
*in = p;
|
|
return 1;
|
|
}
|
|
|
|
/* This function collects the asn1 data from a constructred string
|
|
* type into a buffer. The values of 'in' and 'len' should refer
|
|
* to the contents of the constructed type and 'inf' should be set
|
|
* if it is indefinite length.
|
|
*/
|
|
|
|
static int asn1_collect(BUF_MEM *buf, unsigned char **in, long len, char inf, int tag, int aclass)
|
|
{
|
|
unsigned char *p, *q;
|
|
long plen;
|
|
char cst, ininf;
|
|
p = *in;
|
|
inf &= 1;
|
|
while(len > 0) {
|
|
q = p;
|
|
/* Check for EOC */
|
|
if(asn1_check_eoc(&p, len)) {
|
|
/* EOC is illegal outside indefinite length constructed form */
|
|
if(!inf) {
|
|
ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_UNEXPECTED_EOC);
|
|
return 0;
|
|
}
|
|
inf = 0;
|
|
break;
|
|
}
|
|
if(!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p, len, tag, aclass, 0, NULL)) {
|
|
ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR);
|
|
return 0;
|
|
}
|
|
/* If indefinite length constructed update max length */
|
|
if(cst) {
|
|
#ifdef OPENSSL_ALLOW_NESTED_ASN1_STRINGS
|
|
if (!asn1_collect(buf, &p, plen, ininf, tag, aclass))
|
|
return 0;
|
|
#else
|
|
ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_NESTED_ASN1_STRING);
|
|
return 0;
|
|
#endif
|
|
} else {
|
|
if(plen && !collect_data(buf, &p, plen)) return 0;
|
|
}
|
|
len -= p - q;
|
|
}
|
|
if(inf) {
|
|
ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC);
|
|
return 0;
|
|
}
|
|
*in = p;
|
|
return 1;
|
|
}
|
|
|
|
static int collect_data(BUF_MEM *buf, unsigned char **p, long plen)
|
|
{
|
|
int len;
|
|
if(buf) {
|
|
len = buf->length;
|
|
if(!BUF_MEM_grow_clean(buf, len + plen)) {
|
|
ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE);
|
|
return 0;
|
|
}
|
|
memcpy(buf->data + len, *p, plen);
|
|
}
|
|
*p += plen;
|
|
return 1;
|
|
}
|
|
|
|
/* Check for ASN1 EOC and swallow it if found */
|
|
|
|
static int asn1_check_eoc(unsigned char **in, long len)
|
|
{
|
|
unsigned char *p;
|
|
if(len < 2) return 0;
|
|
p = *in;
|
|
if(!p[0] && !p[1]) {
|
|
*in += 2;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Check an ASN1 tag and length: a bit like ASN1_get_object
|
|
* but it sets the length for indefinite length constructed
|
|
* form, we don't know the exact length but we can set an
|
|
* upper bound to the amount of data available minus the
|
|
* header length just read.
|
|
*/
|
|
|
|
static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass, char *inf, char *cst,
|
|
unsigned char **in, long len, int exptag, int expclass, char opt, ASN1_TLC *ctx)
|
|
{
|
|
int i;
|
|
int ptag, pclass;
|
|
long plen;
|
|
unsigned char *p, *q;
|
|
p = *in;
|
|
q = p;
|
|
|
|
if(ctx && ctx->valid) {
|
|
i = ctx->ret;
|
|
plen = ctx->plen;
|
|
pclass = ctx->pclass;
|
|
ptag = ctx->ptag;
|
|
p += ctx->hdrlen;
|
|
} else {
|
|
i = ASN1_get_object(&p, &plen, &ptag, &pclass, len);
|
|
if(ctx) {
|
|
ctx->ret = i;
|
|
ctx->plen = plen;
|
|
ctx->pclass = pclass;
|
|
ctx->ptag = ptag;
|
|
ctx->hdrlen = p - q;
|
|
ctx->valid = 1;
|
|
/* If definite length, and no error, length +
|
|
* header can't exceed total amount of data available.
|
|
*/
|
|
if(!(i & 0x81) && ((plen + ctx->hdrlen) > len)) {
|
|
ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_TOO_LONG);
|
|
asn1_tlc_clear(ctx);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
if(i & 0x80) {
|
|
ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER);
|
|
asn1_tlc_clear(ctx);
|
|
return 0;
|
|
}
|
|
if(exptag >= 0) {
|
|
if((exptag != ptag) || (expclass != pclass)) {
|
|
/* If type is OPTIONAL, not an error, but indicate missing
|
|
* type.
|
|
*/
|
|
if(opt) return -1;
|
|
asn1_tlc_clear(ctx);
|
|
ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG);
|
|
return 0;
|
|
}
|
|
/* We have a tag and class match, so assume we are going to do something with it */
|
|
asn1_tlc_clear(ctx);
|
|
}
|
|
|
|
if(i & 1) plen = len - (p - q);
|
|
|
|
if(inf) *inf = i & 1;
|
|
|
|
if(cst) *cst = i & V_ASN1_CONSTRUCTED;
|
|
|
|
if(olen) *olen = plen;
|
|
if(oclass) *oclass = pclass;
|
|
if(otag) *otag = ptag;
|
|
|
|
*in = p;
|
|
return 1;
|
|
}
|