early-access version 1255
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pineappleEA
280
externals/libressl/crypto/asn1/tasn_utl.c
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Executable file
280
externals/libressl/crypto/asn1/tasn_utl.c
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/* $OpenBSD: tasn_utl.c,v 1.12 2017/01/29 17:49:22 beck Exp $ */
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/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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* project 2000.
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*/
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/* ====================================================================
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* Copyright (c) 2000-2004 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/err.h>
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/* Utility functions for manipulating fields and offsets */
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/* Add 'offset' to 'addr' */
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#define offset2ptr(addr, offset) (void *)(((char *) addr) + offset)
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/* Given an ASN1_ITEM CHOICE type return
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* the selector value
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*/
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int
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asn1_get_choice_selector(ASN1_VALUE **pval, const ASN1_ITEM *it)
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{
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int *sel = offset2ptr(*pval, it->utype);
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return *sel;
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}
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/* Given an ASN1_ITEM CHOICE type set
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* the selector value, return old value.
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*/
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int
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asn1_set_choice_selector(ASN1_VALUE **pval, int value, const ASN1_ITEM *it)
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{
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int *sel, ret;
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sel = offset2ptr(*pval, it->utype);
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ret = *sel;
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*sel = value;
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return ret;
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}
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/* Do reference counting. The value 'op' decides what to do.
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* if it is +1 then the count is incremented. If op is 0 count is
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* set to 1. If op is -1 count is decremented and the return value
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* is the current refrence count or 0 if no reference count exists.
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*/
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int
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asn1_do_lock(ASN1_VALUE **pval, int op, const ASN1_ITEM *it)
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{
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const ASN1_AUX *aux;
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int *lck, ret;
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if ((it->itype != ASN1_ITYPE_SEQUENCE) &&
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(it->itype != ASN1_ITYPE_NDEF_SEQUENCE))
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return 0;
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aux = it->funcs;
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if (!aux || !(aux->flags & ASN1_AFLG_REFCOUNT))
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return 0;
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lck = offset2ptr(*pval, aux->ref_offset);
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if (op == 0) {
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*lck = 1;
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return 1;
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}
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ret = CRYPTO_add(lck, op, aux->ref_lock);
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return ret;
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}
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static ASN1_ENCODING *
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asn1_get_enc_ptr(ASN1_VALUE **pval, const ASN1_ITEM *it)
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{
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const ASN1_AUX *aux;
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if (!pval || !*pval)
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return NULL;
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aux = it->funcs;
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if (!aux || !(aux->flags & ASN1_AFLG_ENCODING))
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return NULL;
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return offset2ptr(*pval, aux->enc_offset);
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}
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void
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asn1_enc_init(ASN1_VALUE **pval, const ASN1_ITEM *it)
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{
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ASN1_ENCODING *enc;
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enc = asn1_get_enc_ptr(pval, it);
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if (enc) {
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enc->enc = NULL;
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enc->len = 0;
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enc->modified = 1;
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}
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}
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void
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asn1_enc_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
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{
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ASN1_ENCODING *enc;
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enc = asn1_get_enc_ptr(pval, it);
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if (enc) {
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free(enc->enc);
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enc->enc = NULL;
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enc->len = 0;
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enc->modified = 1;
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}
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}
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int
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asn1_enc_save(ASN1_VALUE **pval, const unsigned char *in, int inlen,
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const ASN1_ITEM *it)
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{
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ASN1_ENCODING *enc;
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enc = asn1_get_enc_ptr(pval, it);
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if (!enc)
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return 1;
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free(enc->enc);
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enc->enc = malloc(inlen);
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if (!enc->enc)
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return 0;
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memcpy(enc->enc, in, inlen);
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enc->len = inlen;
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enc->modified = 0;
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return 1;
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}
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int
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asn1_enc_restore(int *len, unsigned char **out, ASN1_VALUE **pval,
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const ASN1_ITEM *it)
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{
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ASN1_ENCODING *enc;
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enc = asn1_get_enc_ptr(pval, it);
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if (!enc || enc->modified)
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return 0;
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if (out) {
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memcpy(*out, enc->enc, enc->len);
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*out += enc->len;
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}
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if (len)
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*len = enc->len;
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return 1;
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}
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/* Given an ASN1_TEMPLATE get a pointer to a field */
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ASN1_VALUE **
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asn1_get_field_ptr(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
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{
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ASN1_VALUE **pvaltmp;
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if (tt->flags & ASN1_TFLG_COMBINE)
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return pval;
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pvaltmp = offset2ptr(*pval, tt->offset);
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/* NOTE for BOOLEAN types the field is just a plain
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* int so we can't return int **, so settle for
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* (int *).
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*/
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return pvaltmp;
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}
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/* Handle ANY DEFINED BY template, find the selector, look up
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* the relevant ASN1_TEMPLATE in the table and return it.
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*/
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const ASN1_TEMPLATE *
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asn1_do_adb(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt, int nullerr)
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{
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const ASN1_ADB *adb;
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const ASN1_ADB_TABLE *atbl;
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long selector;
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ASN1_VALUE **sfld;
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int i;
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if (!(tt->flags & ASN1_TFLG_ADB_MASK))
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return tt;
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/* Else ANY DEFINED BY ... get the table */
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adb = (const ASN1_ADB *)tt->item;
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/* Get the selector field */
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sfld = offset2ptr(*pval, adb->offset);
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/* Check if NULL */
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if (!sfld) {
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if (!adb->null_tt)
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goto err;
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return adb->null_tt;
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}
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/* Convert type to a long:
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* NB: don't check for NID_undef here because it
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* might be a legitimate value in the table
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*/
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if (tt->flags & ASN1_TFLG_ADB_OID)
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selector = OBJ_obj2nid((ASN1_OBJECT *)*sfld);
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else
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selector = ASN1_INTEGER_get((ASN1_INTEGER *)*sfld);
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/* Try to find matching entry in table
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* Maybe should check application types first to
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* allow application override? Might also be useful
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* to have a flag which indicates table is sorted and
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* we can do a binary search. For now stick to a
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* linear search.
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*/
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for (atbl = adb->tbl, i = 0; i < adb->tblcount; i++, atbl++)
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if (atbl->value == selector)
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return &atbl->tt;
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/* FIXME: need to search application table too */
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/* No match, return default type */
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if (!adb->default_tt)
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goto err;
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return adb->default_tt;
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err:
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/* FIXME: should log the value or OID of unsupported type */
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if (nullerr)
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ASN1error(ASN1_R_UNSUPPORTED_ANY_DEFINED_BY_TYPE);
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return NULL;
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}
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