-/* tasn_dec.c */
-/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
- * project 2000.
- */
-/* ====================================================================
- * Copyright (c) 2000 The OpenSSL Project. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. All advertising materials mentioning features or use of this
- * software must display the following acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
- *
- * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission. For written permission, please contact
- * licensing@OpenSSL.org.
- *
- * 5. Products derived from this software may not be called "OpenSSL"
- * nor may "OpenSSL" appear in their names without prior written
- * permission of the OpenSSL Project.
- *
- * 6. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
- *
- * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
- * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- * ====================================================================
- *
- * This product includes cryptographic software written by Eric Young
- * (eay@cryptsoft.com). This product includes software written by Tim
- * Hudson (tjh@cryptsoft.com).
+/*
+ * Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
*
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
*/
-
#include <stddef.h>
#include <string.h>
#include <openssl/asn1.h>
#include <openssl/objects.h>
#include <openssl/buffer.h>
#include <openssl/err.h>
-
-static int asn1_check_eoc(unsigned char **in, long len);
-static int asn1_collect(BUF_MEM *buf, unsigned char **in, long len, char inf, int tag, int aclass);
-static int collect_data(BUF_MEM *buf, unsigned char **p, long plen);
-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);
-static int asn1_template_ex_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx);
-static int asn1_template_noexp_d2i(ASN1_VALUE **val, unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx);
-static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, unsigned char **in, long len,
- const ASN1_ITEM *it, int tag, int aclass, char opt, ASN1_TLC *ctx);
+#include "internal/numbers.h"
+#include "asn1_locl.h"
+
+static int asn1_item_embed_d2i(ASN1_VALUE **pval, const unsigned char **in,
+ long len, const ASN1_ITEM *it,
+ int tag, int aclass, char opt, ASN1_TLC *ctx);
+
+static int asn1_check_eoc(const unsigned char **in, long len);
+static int asn1_find_end(const unsigned char **in, long len, char inf);
+
+static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
+ char inf, int tag, int aclass, int depth);
+
+static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen);
+
+static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
+ char *inf, char *cst,
+ const unsigned char **in, long len,
+ int exptag, int expclass, char opt, ASN1_TLC *ctx);
+
+static int asn1_template_ex_d2i(ASN1_VALUE **pval,
+ const unsigned char **in, long len,
+ const ASN1_TEMPLATE *tt, char opt,
+ ASN1_TLC *ctx);
+static int asn1_template_noexp_d2i(ASN1_VALUE **val,
+ const unsigned char **in, long len,
+ const ASN1_TEMPLATE *tt, char opt,
+ ASN1_TLC *ctx);
+static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
+ const unsigned char **in, long len,
+ const ASN1_ITEM *it,
+ int tag, int aclass, char opt,
+ ASN1_TLC *ctx);
+static int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
+ int utype, char *free_cont, const ASN1_ITEM *it);
+
+/* Table to convert tags to bit values, used for MSTRING type */
+static const unsigned long tag2bit[32] = {
+ /* tags 0 - 3 */
+ 0, 0, 0, B_ASN1_BIT_STRING,
+ /* tags 4- 7 */
+ B_ASN1_OCTET_STRING, 0, 0, B_ASN1_UNKNOWN,
+ /* tags 8-11 */
+ B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,
+ /* tags 12-15 */
+ B_ASN1_UTF8STRING, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,
+ /* tags 16-19 */
+ B_ASN1_SEQUENCE, 0, B_ASN1_NUMERICSTRING, B_ASN1_PRINTABLESTRING,
+ /* tags 20-22 */
+ B_ASN1_T61STRING, B_ASN1_VIDEOTEXSTRING, B_ASN1_IA5STRING,
+ /* tags 23-24 */
+ B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME,
+ /* tags 25-27 */
+ B_ASN1_GRAPHICSTRING, B_ASN1_ISO64STRING, B_ASN1_GENERALSTRING,
+ /* tags 28-31 */
+ B_ASN1_UNIVERSALSTRING, B_ASN1_UNKNOWN, B_ASN1_BMPSTRING, B_ASN1_UNKNOWN,
+};
+
+unsigned long ASN1_tag2bit(int tag)
+{
+ if ((tag < 0) || (tag > 30))
+ return 0;
+ return tag2bit[tag];
+}
/* Macro to initialize and invalidate the cache */
-#define asn1_tlc_clear(c) if(c) (c)->valid = 0
+#define asn1_tlc_clear(c) if (c) (c)->valid = 0
+/* Version to avoid compiler warning about 'c' always non-NULL */
+#define asn1_tlc_clear_nc(c) (c)->valid = 0
-/* Decode an ASN1 item, this currently behaves just
- * like a standard 'd2i' function. 'in' points to
- * a buffer to read the data from, in future we will
- * have more advanced versions that can input data
- * a piece at a time and this will simply be a special
- * case.
+/*
+ * Decode an ASN1 item, this currently behaves just like a standard 'd2i'
+ * function. 'in' points to a buffer to read the data from, in future we
+ * will have more advanced versions that can input data a piece at a time and
+ * this will simply be a special case.
*/
-ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_ITEM *it)
+ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval,
+ const unsigned char **in, long len,
+ const ASN1_ITEM *it)
{
- ASN1_TLC c;
- ASN1_VALUE *ptmpval = NULL;
- if(!pval) pval = &ptmpval;
- asn1_tlc_clear(&c);
- if(ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0)
- return *pval;
- return NULL;
+ ASN1_TLC c;
+ ASN1_VALUE *ptmpval = NULL;
+ if (!pval)
+ pval = &ptmpval;
+ asn1_tlc_clear_nc(&c);
+ if (ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0)
+ return *pval;
+ return NULL;
}
-int ASN1_template_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_TEMPLATE *tt)
+int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len,
+ const ASN1_ITEM *it,
+ int tag, int aclass, char opt, ASN1_TLC *ctx)
{
- ASN1_TLC c;
- asn1_tlc_clear(&c);
- return asn1_template_ex_d2i(pval, in, len, tt, 0, &c);
+ int rv;
+ rv = asn1_item_embed_d2i(pval, in, len, it, tag, aclass, opt, ctx);
+ if (rv <= 0)
+ ASN1_item_ex_free(pval, it);
+ return rv;
}
-
-/* Decode an item, taking care of IMPLICIT tagging, if any.
- * If 'opt' set and tag mismatch return -1 to handle OPTIONAL
+/*
+ * Decode an item, taking care of IMPLICIT tagging, if any. If 'opt' set and
+ * tag mismatch return -1 to handle OPTIONAL
*/
-int ASN1_item_ex_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_ITEM *it,
- int tag, int aclass, char opt, ASN1_TLC *ctx)
+static int asn1_item_embed_d2i(ASN1_VALUE **pval, const unsigned char **in,
+ long len, const ASN1_ITEM *it,
+ int tag, int aclass, char opt, ASN1_TLC *ctx)
{
- const ASN1_TEMPLATE *tt, *errtt = NULL;
- const ASN1_COMPAT_FUNCS *cf;
- const ASN1_EXTERN_FUNCS *ef;
- const ASN1_AUX *aux = it->funcs;
- ASN1_aux_cb *asn1_cb;
- unsigned char *p, *q, imphack = 0, oclass;
- char seq_eoc, seq_nolen, cst, isopt;
- long tmplen;
- int i;
- int otag;
- int ret = 0;
- ASN1_VALUE *pchval, **pchptr, *ptmpval;
- if(!pval) return 0;
- if(aux && aux->asn1_cb) asn1_cb = aux->asn1_cb;
- else asn1_cb = 0;
-
- switch(it->itype) {
-
- case ASN1_ITYPE_PRIMITIVE:
- if(it->templates) {
- /* tagging or OPTIONAL is currently illegal on an item template
- * because the flags can't get passed down. In practice this isn't
- * a problem: we include the relevant flags from the item template
- * in the template itself.
- */
- if ((tag != -1) || opt) {
- ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);
- goto err;
- }
- return asn1_template_ex_d2i(pval, in, len, it->templates, opt, ctx);
- }
- return asn1_d2i_ex_primitive(pval, in, len, it, tag, aclass, opt, ctx);
- break;
-
- case ASN1_ITYPE_MSTRING:
- p = *in;
- /* Just read in tag and class */
- ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL, &p, len, -1, 0, 1, ctx);
- if(!ret) {
- ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
- goto err;
- }
- /* Must be UNIVERSAL class */
- if(oclass != V_ASN1_UNIVERSAL) {
- /* If OPTIONAL, assume this is OK */
- if(opt) return -1;
- ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MSTRING_NOT_UNIVERSAL);
- goto err;
- }
- /* Check tag matches bit map */
- if(!(ASN1_tag2bit(otag) & it->utype)) {
- /* If OPTIONAL, assume this is OK */
- if(opt) return -1;
- ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MSTRING_WRONG_TAG);
- goto err;
- }
- return asn1_d2i_ex_primitive(pval, in, len, it, otag, 0, 0, ctx);
-
- case ASN1_ITYPE_EXTERN:
- /* Use new style d2i */
- ef = it->funcs;
- return ef->asn1_ex_d2i(pval, in, len, it, tag, aclass, opt, ctx);
-
- case ASN1_ITYPE_COMPAT:
- /* we must resort to old style evil hackery */
- cf = it->funcs;
-
- /* If OPTIONAL see if it is there */
- if(opt) {
- int exptag;
- p = *in;
- if(tag == -1) exptag = it->utype;
- else exptag = tag;
- /* Don't care about anything other than presence of expected tag */
- ret = asn1_check_tlen(NULL, NULL, NULL, NULL, NULL, &p, len, exptag, aclass, 1, ctx);
- if(!ret) {
- ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
- goto err;
- }
- if(ret == -1) return -1;
- }
- /* This is the old style evil hack IMPLICIT handling:
- * since the underlying code is expecting a tag and
- * class other than the one present we change the
- * buffer temporarily then change it back afterwards.
- * This doesn't and never did work for tags > 30.
- *
- * Yes this is *horrible* but it is only needed for
- * old style d2i which will hopefully not be around
- * for much longer.
- * FIXME: should copy the buffer then modify it so
- * the input buffer can be const: we should *always*
- * copy because the old style d2i might modify the
- * buffer.
- */
-
- if(tag != -1) {
- p = *in;
- imphack = *p;
- *p = (unsigned char)((*p & V_ASN1_CONSTRUCTED) | it->utype);
- }
-
- ptmpval = cf->asn1_d2i(pval, in, len);
-
- if(tag != -1) *p = imphack;
-
- if(ptmpval) return 1;
- ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
- goto err;
-
-
- case ASN1_ITYPE_CHOICE:
- if(asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))
- goto auxerr;
- /* CHOICE type, try each possibility in turn */
- pchval = NULL;
- p = *in;
- for(i = 0, tt=it->templates; i < it->tcount; i++, tt++) {
- /* We mark field as OPTIONAL so its absence
- * can be recognised.
- */
- ret = asn1_template_ex_d2i(&pchval, &p, len, tt, 1, ctx);
- /* If field not present, try the next one */
- if(ret == -1) continue;
- /* If positive return, read OK, break loop */
- if(ret > 0) break;
- /* Otherwise must be an ASN1 parsing error */
- errtt = tt;
- ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
- goto err;
- }
- /* Did we fall off the end without reading anything? */
- if(i == it->tcount) {
- /* If OPTIONAL, this is OK */
- if(opt) return -1;
- ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_NO_MATCHING_CHOICE_TYPE);
- goto err;
- }
- /* Otherwise we got a match, allocate structure and populate it */
- if(!*pval) {
- if(!ASN1_item_ex_new(pval, it)) {
- errtt = tt;
- ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
- goto err;
- }
- }
- pchptr = asn1_get_field_ptr(pval, tt);
- *pchptr = pchval;
- asn1_set_choice_selector(pval, i, it);
- *in = p;
- if(asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))
- goto auxerr;
- return 1;
-
- case ASN1_ITYPE_SEQUENCE:
- p = *in;
- tmplen = len;
-
- /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
- if(tag == -1) {
- tag = V_ASN1_SEQUENCE;
- aclass = V_ASN1_UNIVERSAL;
- }
- /* Get SEQUENCE length and update len, p */
- ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst, &p, len, tag, aclass, opt, ctx);
- if(!ret) {
- ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
- goto err;
- } else if(ret == -1) return -1;
- if(aux && (aux->flags & ASN1_AFLG_BROKEN)) {
- len = tmplen - (p - *in);
- seq_nolen = 1;
- } else seq_nolen = seq_eoc; /* If indefinite we don't do a length check */
- if(!cst) {
- ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
- goto err;
- }
-
- if(!*pval) {
- if(!ASN1_item_ex_new(pval, it)) {
- ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
- goto err;
- }
- }
- if(asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))
- goto auxerr;
-
- /* Get each field entry */
- for(i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
- const ASN1_TEMPLATE *seqtt;
- ASN1_VALUE **pseqval;
- seqtt = asn1_do_adb(pval, tt, 1);
- if(!seqtt) goto err;
- pseqval = asn1_get_field_ptr(pval, seqtt);
- /* Have we ran out of data? */
- if(!len) break;
- q = p;
- if(asn1_check_eoc(&p, len)) {
- if(!seq_eoc) {
- ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_UNEXPECTED_EOC);
- goto err;
- }
- len -= p - q;
- seq_eoc = 0;
- q = p;
- break;
- }
- /* This determines the OPTIONAL flag value. The field cannot
- * be omitted if it is the last of a SEQUENCE and there is
- * still data to be read. This isn't strictly necessary but
- * it increases efficiency in some cases.
- */
- if(i == (it->tcount - 1)) isopt = 0;
- else isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
- /* attempt to read in field, allowing each to be OPTIONAL */
- ret = asn1_template_ex_d2i(pseqval, &p, len, seqtt, isopt, ctx);
- if(!ret) {
- errtt = seqtt;
- goto err;
- } else if(ret == -1) {
- /* OPTIONAL component absent. Free and zero the field
- */
- ASN1_template_free(pseqval, seqtt);
- continue;
- }
- /* Update length */
- len -= p - q;
- }
- /* Check for EOC if expecting one */
- if(seq_eoc && !asn1_check_eoc(&p, len)) {
- ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MISSING_EOC);
- goto err;
- }
- /* Check all data read */
- if(!seq_nolen && len) {
- ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_SEQUENCE_LENGTH_MISMATCH);
- goto err;
- }
-
- /* If we get here we've got no more data in the SEQUENCE,
- * however we may not have read all fields so check all
- * remaining are OPTIONAL and clear any that are.
- */
- for(; i < it->tcount; tt++, i++) {
- const ASN1_TEMPLATE *seqtt;
- seqtt = asn1_do_adb(pval, tt, 1);
- if(!seqtt) goto err;
- if(seqtt->flags & ASN1_TFLG_OPTIONAL) {
- ASN1_VALUE **pseqval;
- pseqval = asn1_get_field_ptr(pval, seqtt);
- ASN1_template_free(pseqval, seqtt);
- } else {
- errtt = seqtt;
- ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_FIELD_MISSING);
- goto err;
- }
- }
- /* Save encoding */
- if(!asn1_enc_save(pval, *in, p - *in, it)) goto auxerr;
- *in = p;
- if(asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))
- goto auxerr;
- return 1;
-
- default:
- return 0;
- }
- auxerr:
- ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_AUX_ERROR);
- err:
- ASN1_item_ex_free(pval, it);
- if(errtt) ERR_add_error_data(4, "Field=", errtt->field_name, ", Type=", it->sname);
- else ERR_add_error_data(2, "Type=", it->sname);
- return 0;
+ const ASN1_TEMPLATE *tt, *errtt = NULL;
+ const ASN1_EXTERN_FUNCS *ef;
+ const ASN1_AUX *aux = it->funcs;
+ ASN1_aux_cb *asn1_cb;
+ const unsigned char *p = NULL, *q;
+ unsigned char oclass;
+ char seq_eoc, seq_nolen, cst, isopt;
+ long tmplen;
+ int i;
+ int otag;
+ int ret = 0;
+ ASN1_VALUE **pchptr;
+ if (!pval)
+ return 0;
+ if (aux && aux->asn1_cb)
+ asn1_cb = aux->asn1_cb;
+ else
+ asn1_cb = 0;
+
+ switch (it->itype) {
+ case ASN1_ITYPE_PRIMITIVE:
+ if (it->templates) {
+ /*
+ * tagging or OPTIONAL is currently illegal on an item template
+ * because the flags can't get passed down. In practice this
+ * isn't a problem: we include the relevant flags from the item
+ * template in the template itself.
+ */
+ if ((tag != -1) || opt) {
+ ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I,
+ ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);
+ goto err;
+ }
+ return asn1_template_ex_d2i(pval, in, len,
+ it->templates, opt, ctx);
+ }
+ return asn1_d2i_ex_primitive(pval, in, len, it,
+ tag, aclass, opt, ctx);
+
+ case ASN1_ITYPE_MSTRING:
+ p = *in;
+ /* Just read in tag and class */
+ ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL,
+ &p, len, -1, 0, 1, ctx);
+ if (!ret) {
+ ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ERR_R_NESTED_ASN1_ERROR);
+ goto err;
+ }
+
+ /* Must be UNIVERSAL class */
+ if (oclass != V_ASN1_UNIVERSAL) {
+ /* If OPTIONAL, assume this is OK */
+ if (opt)
+ return -1;
+ ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_MSTRING_NOT_UNIVERSAL);
+ goto err;
+ }
+ /* Check tag matches bit map */
+ if (!(ASN1_tag2bit(otag) & it->utype)) {
+ /* If OPTIONAL, assume this is OK */
+ if (opt)
+ return -1;
+ ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_MSTRING_WRONG_TAG);
+ goto err;
+ }
+ return asn1_d2i_ex_primitive(pval, in, len, it, otag, 0, 0, ctx);
+
+ case ASN1_ITYPE_EXTERN:
+ /* Use new style d2i */
+ ef = it->funcs;
+ return ef->asn1_ex_d2i(pval, in, len, it, tag, aclass, opt, ctx);
+
+ case ASN1_ITYPE_CHOICE:
+ if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
+ goto auxerr;
+ if (*pval) {
+ /* Free up and zero CHOICE value if initialised */
+ i = asn1_get_choice_selector(pval, it);
+ if ((i >= 0) && (i < it->tcount)) {
+ tt = it->templates + i;
+ pchptr = asn1_get_field_ptr(pval, tt);
+ asn1_template_free(pchptr, tt);
+ asn1_set_choice_selector(pval, -1, it);
+ }
+ } else if (!ASN1_item_ex_new(pval, it)) {
+ ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ERR_R_NESTED_ASN1_ERROR);
+ goto err;
+ }
+ /* CHOICE type, try each possibility in turn */
+ p = *in;
+ for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
+ pchptr = asn1_get_field_ptr(pval, tt);
+ /*
+ * We mark field as OPTIONAL so its absence can be recognised.
+ */
+ ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx);
+ /* If field not present, try the next one */
+ if (ret == -1)
+ continue;
+ /*
+ * Set the choice selector here to ensure that the value is
+ * correctly freed upon error. It may be partially initialized
+ * even if parsing failed.
+ */
+ asn1_set_choice_selector(pval, i, it);
+ /* If positive return, read OK, break loop */
+ if (ret > 0)
+ break;
+ /* Otherwise must be an ASN1 parsing error */
+ errtt = tt;
+ ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ERR_R_NESTED_ASN1_ERROR);
+ goto err;
+ }
+
+ /* Did we fall off the end without reading anything? */
+ if (i == it->tcount) {
+ /* If OPTIONAL, this is OK */
+ if (opt) {
+ /* Free and zero it */
+ ASN1_item_ex_free(pval, it);
+ return -1;
+ }
+ ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_NO_MATCHING_CHOICE_TYPE);
+ goto err;
+ }
+
+ if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
+ goto auxerr;
+ *in = p;
+ return 1;
+
+ case ASN1_ITYPE_NDEF_SEQUENCE:
+ case ASN1_ITYPE_SEQUENCE:
+ p = *in;
+ tmplen = len;
+
+ /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
+ if (tag == -1) {
+ tag = V_ASN1_SEQUENCE;
+ aclass = V_ASN1_UNIVERSAL;
+ }
+ /* Get SEQUENCE length and update len, p */
+ ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst,
+ &p, len, tag, aclass, opt, ctx);
+ if (!ret) {
+ ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ERR_R_NESTED_ASN1_ERROR);
+ goto err;
+ } else if (ret == -1)
+ return -1;
+ if (aux && (aux->flags & ASN1_AFLG_BROKEN)) {
+ len = tmplen - (p - *in);
+ seq_nolen = 1;
+ }
+ /* If indefinite we don't do a length check */
+ else
+ seq_nolen = seq_eoc;
+ if (!cst) {
+ ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
+ goto err;
+ }
+
+ if (!*pval && !ASN1_item_ex_new(pval, it)) {
+ ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ERR_R_NESTED_ASN1_ERROR);
+ goto err;
+ }
+
+ if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
+ goto auxerr;
+
+ /* Free up and zero any ADB found */
+ for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
+ if (tt->flags & ASN1_TFLG_ADB_MASK) {
+ const ASN1_TEMPLATE *seqtt;
+ ASN1_VALUE **pseqval;
+ seqtt = asn1_do_adb(pval, tt, 1);
+ if (seqtt == NULL)
+ continue;
+ pseqval = asn1_get_field_ptr(pval, seqtt);
+ asn1_template_free(pseqval, seqtt);
+ }
+ }
+
+ /* Get each field entry */
+ for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
+ const ASN1_TEMPLATE *seqtt;
+ ASN1_VALUE **pseqval;
+ seqtt = asn1_do_adb(pval, tt, 1);
+ if (seqtt == NULL)
+ goto err;
+ pseqval = asn1_get_field_ptr(pval, seqtt);
+ /* Have we ran out of data? */
+ if (!len)
+ break;
+ q = p;
+ if (asn1_check_eoc(&p, len)) {
+ if (!seq_eoc) {
+ ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_UNEXPECTED_EOC);
+ goto err;
+ }
+ len -= p - q;
+ seq_eoc = 0;
+ q = p;
+ break;
+ }
+ /*
+ * This determines the OPTIONAL flag value. The field cannot be
+ * omitted if it is the last of a SEQUENCE and there is still
+ * data to be read. This isn't strictly necessary but it
+ * increases efficiency in some cases.
+ */
+ if (i == (it->tcount - 1))
+ isopt = 0;
+ else
+ isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
+ /*
+ * attempt to read in field, allowing each to be OPTIONAL
+ */
+
+ ret = asn1_template_ex_d2i(pseqval, &p, len, seqtt, isopt, ctx);
+ if (!ret) {
+ errtt = seqtt;
+ goto err;
+ } else if (ret == -1) {
+ /*
+ * OPTIONAL component absent. Free and zero the field.
+ */
+ asn1_template_free(pseqval, seqtt);
+ continue;
+ }
+ /* Update length */
+ len -= p - q;
+ }
+
+ /* Check for EOC if expecting one */
+ if (seq_eoc && !asn1_check_eoc(&p, len)) {
+ ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_MISSING_EOC);
+ goto err;
+ }
+ /* Check all data read */
+ if (!seq_nolen && len) {
+ ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_SEQUENCE_LENGTH_MISMATCH);
+ goto err;
+ }
+
+ /*
+ * If we get here we've got no more data in the SEQUENCE, however we
+ * may not have read all fields so check all remaining are OPTIONAL
+ * and clear any that are.
+ */
+ for (; i < it->tcount; tt++, i++) {
+ const ASN1_TEMPLATE *seqtt;
+ seqtt = asn1_do_adb(pval, tt, 1);
+ if (seqtt == NULL)
+ goto err;
+ if (seqtt->flags & ASN1_TFLG_OPTIONAL) {
+ ASN1_VALUE **pseqval;
+ pseqval = asn1_get_field_ptr(pval, seqtt);
+ asn1_template_free(pseqval, seqtt);
+ } else {
+ errtt = seqtt;
+ ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_FIELD_MISSING);
+ goto err;
+ }
+ }
+ /* Save encoding */
+ if (!asn1_enc_save(pval, *in, p - *in, it))
+ goto auxerr;
+ if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
+ goto auxerr;
+ *in = p;
+ return 1;
+
+ default:
+ return 0;
+ }
+ auxerr:
+ ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_AUX_ERROR);
+ err:
+ if (errtt)
+ ERR_add_error_data(4, "Field=", errtt->field_name,
+ ", Type=", it->sname);
+ else
+ ERR_add_error_data(2, "Type=", it->sname);
+ return 0;
}
-/* Templates are handled with two separate functions. One handles any EXPLICIT tag and the other handles the
- * rest.
+/*
+ * Templates are handled with two separate functions. One handles any
+ * EXPLICIT tag and the other handles the rest.
*/
-int asn1_template_ex_d2i(ASN1_VALUE **val, unsigned char **in, long inlen, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx)
+static int asn1_template_ex_d2i(ASN1_VALUE **val,
+ const unsigned char **in, long inlen,
+ const ASN1_TEMPLATE *tt, char opt,
+ ASN1_TLC *ctx)
{
- 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;
+ int flags, aclass;
+ int ret;
+ long len;
+ const 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_EX_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_EX_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:
+ 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)
+static int asn1_template_noexp_d2i(ASN1_VALUE **val,
+ const 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;
+ int flags, aclass;
+ int ret;
+ ASN1_VALUE *tval;
+ const unsigned char *p, *q;
+ if (!val)
+ return 0;
+ flags = tt->flags;
+ aclass = flags & ASN1_TFLG_TAG_CLASS;
+
+ p = *in;
+ q = p;
+
+ /*
+ * If field is embedded then val needs fixing so it is a pointer to
+ * a pointer to a field.
+ */
+ if (tt->flags & ASN1_TFLG_EMBED) {
+ tval = (ASN1_VALUE *)val;
+ val = &tval;
+ }
+
+ 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_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR);
+ return 0;
+ } else if (ret == -1)
+ return -1;
+ if (!*val)
+ *val = (ASN1_VALUE *)OPENSSL_sk_new_null();
+ else {
+ /*
+ * We've got a valid STACK: free up any items present
+ */
+ STACK_OF(ASN1_VALUE) *sktmp = (STACK_OF(ASN1_VALUE) *)*val;
+ ASN1_VALUE *vtmp;
+ while (sk_ASN1_VALUE_num(sktmp) > 0) {
+ vtmp = sk_ASN1_VALUE_pop(sktmp);
+ ASN1_item_ex_free(&vtmp, ASN1_ITEM_ptr(tt->item));
+ }
+ }
+
+ if (!*val) {
+ ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_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_NOEXP_D2I,
+ ASN1_R_UNEXPECTED_EOC);
+ goto err;
+ }
+ len -= p - q;
+ sk_eoc = 0;
+ break;
+ }
+ skfield = NULL;
+ if (!asn1_item_embed_d2i(&skfield, &p, len,
+ ASN1_ITEM_ptr(tt->item), -1, 0, 0, ctx)) {
+ ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
+ ERR_R_NESTED_ASN1_ERROR);
+ /* |skfield| may be partially allocated despite failure. */
+ ASN1_item_free(skfield, ASN1_ITEM_ptr(tt->item));
+ goto err;
+ }
+ len -= p - q;
+ if (!sk_ASN1_VALUE_push((STACK_OF(ASN1_VALUE) *)*val, skfield)) {
+ ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_MALLOC_FAILURE);
+ ASN1_item_free(skfield, ASN1_ITEM_ptr(tt->item));
+ goto err;
+ }
+ }
+ if (sk_eoc) {
+ ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ASN1_R_MISSING_EOC);
+ goto err;
+ }
+ } else if (flags & ASN1_TFLG_IMPTAG) {
+ /* IMPLICIT tagging */
+ ret = asn1_item_embed_d2i(val, &p, len,
+ ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt,
+ ctx);
+ if (!ret) {
+ ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR);
+ goto err;
+ } else if (ret == -1)
+ return -1;
+ } else {
+ /* Nothing special */
+ ret = asn1_item_embed_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item),
+ -1, 0, opt, ctx);
+ if (!ret) {
+ ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR);
+ goto err;
+ } else if (ret == -1)
+ return -1;
+ }
+
+ *in = p;
+ return 1;
+
+ err:
+ 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)
+static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
+ const 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)) {
- /* SEQUENCE and SET must be constructed */
- if((utype != V_ASN1_OTHER) && !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_collect(NULL, &p, plen, inf, -1, -1)) 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(&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;
+ int ret = 0, utype;
+ long plen;
+ char cst, inf, free_cont = 0;
+ const unsigned char *p;
+ BUF_MEM buf = { 0, NULL, 0, 0 };
+ const 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;
+ ret = 0;
+ /* 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;
+ }
+ } else if (cst) {
+ if (utype == V_ASN1_NULL || utype == V_ASN1_BOOLEAN
+ || utype == V_ASN1_OBJECT || utype == V_ASN1_INTEGER
+ || utype == V_ASN1_ENUMERATED) {
+ ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_TYPE_NOT_PRIMITIVE);
+ return 0;
+ }
+
+ /* Free any returned 'buf' content */
+ free_cont = 1;
+ /*
+ * 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, 0)) {
+ 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);
+ goto err;
+ }
+ buf.data[len] = 0;
+ cont = (const unsigned char *)buf.data;
+ } else {
+ cont = p;
+ len = plen;
+ p += plen;
+ }
+
+ /* We now have content length and type: translate into a structure */
+ /* asn1_ex_c2i may reuse allocated buffer, and so sets free_cont to 0 */
+ if (!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it))
+ goto err;
+
+ *in = p;
+ ret = 1;
+ err:
+ if (free_cont)
+ 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)
+static int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
+ int utype, char *free_cont, const ASN1_ITEM *it)
{
- 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);
- 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);
- return ret;
+ 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();
+ if (typ == NULL)
+ goto err;
+ *pval = (ASN1_VALUE *)typ;
+ } else
+ typ = (ASN1_TYPE *)*pval;
+
+ if (utype != typ->type)
+ ASN1_TYPE_set(typ, utype, NULL);
+ opval = pval;
+ pval = &typ->value.asn1_value;
+ }
+ 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_EX_C2I, ASN1_R_NULL_IS_WRONG_LENGTH);
+ goto err;
+ }
+ *pval = (ASN1_VALUE *)1;
+ break;
+
+ case V_ASN1_BOOLEAN:
+ if (len != 1) {
+ ASN1err(ASN1_F_ASN1_EX_C2I, 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_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:
+ if (utype == V_ASN1_BMPSTRING && (len & 1)) {
+ ASN1err(ASN1_F_ASN1_EX_C2I, ASN1_R_BMPSTRING_IS_WRONG_LENGTH);
+ goto err;
+ }
+ if (utype == V_ASN1_UNIVERSALSTRING && (len & 3)) {
+ ASN1err(ASN1_F_ASN1_EX_C2I,
+ ASN1_R_UNIVERSALSTRING_IS_WRONG_LENGTH);
+ goto err;
+ }
+ /* All based on ASN1_STRING and handled the same */
+ if (!*pval) {
+ stmp = ASN1_STRING_type_new(utype);
+ if (stmp == NULL) {
+ ASN1err(ASN1_F_ASN1_EX_C2I, 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) {
+ OPENSSL_free(stmp->data);
+ stmp->data = (unsigned char *)cont; /* UGLY CAST! RL */
+ stmp->length = len;
+ *free_cont = 0;
+ } else {
+ if (!ASN1_STRING_set(stmp, cont, len)) {
+ ASN1err(ASN1_F_ASN1_EX_C2I, 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 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. If 'buf' is NULL then we just want
- * to find the end of the current structure: useful for indefinite
- * length constructed stuff.
+/*
+ * 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(const unsigned char **in, long len, char inf)
+{
+ uint32_t expected_eoc;
+ long plen;
+ const 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 just 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) {
+ if (expected_eoc == UINT32_MAX) {
+ ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR);
+ return 0;
+ }
+ 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 constructed 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.
+ */
+
+#ifndef ASN1_MAX_STRING_NEST
+/*
+ * This determines how many levels of recursion are permitted in ASN1 string
+ * types. If it is not limited stack overflows can occur. If set to zero no
+ * recursion is allowed at all. Although zero should be adequate examples
+ * exist that require a value of 1. So 5 should be more than enough.
*/
+# define ASN1_MAX_STRING_NEST 5
+#endif
-static int asn1_collect(BUF_MEM *buf, unsigned char **in, long len, char inf, int tag, int aclass)
+static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
+ char inf, int tag, int aclass, int depth)
{
- unsigned char *p, *q;
- long plen;
- char cst, ininf;
- p = *in;
- inf &= 1;
- /* If no buffer and not indefinite length constructed just pass over the encoded data */
- if(!buf && !inf) {
- *in += len;
- return 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) {
- if(!asn1_collect(buf, &p, plen, ininf, tag, aclass)) return 0;
- } else {
- if(!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;
+ const unsigned char *p, *q;
+ long plen;
+ char cst, ininf;
+ p = *in;
+ inf &= 1;
+ /*
+ * If no buffer and not indefinite length constructed just pass over the
+ * encoded data
+ */
+ if (!buf && !inf) {
+ *in += len;
+ return 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) {
+ if (depth >= ASN1_MAX_STRING_NEST) {
+ ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_NESTED_ASN1_STRING);
+ return 0;
+ }
+ if (!asn1_collect(buf, &p, plen, ininf, tag, aclass, depth + 1))
+ return 0;
+ } 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)
+static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen)
{
- int len;
- if(buf) {
- len = buf->length;
- if(!BUF_MEM_grow(buf, len + plen)) {
- ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE);
- return 0;
- }
- memcpy(buf->data + len, *p, plen);
- }
- *p += plen;
- return 1;
+ 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)
+static int asn1_check_eoc(const 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;
+ const 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.
+/*
+ * 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)
+static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
+ char *inf, char *cst,
+ const 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, length + header can't exceed total
- * amount of data available.
- */
- if(!(i & 1) && ((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;
+ int i;
+ int ptag, pclass;
+ long plen;
+ const 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: 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: 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;
}
projects / openssl.git / blobdiff