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275 lines
8.1 KiB
275 lines
8.1 KiB
/* tasn_utl.c */ |
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/* |
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* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project |
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* 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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/* |
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* Given an ASN1_ITEM CHOICE type return the selector value |
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*/ |
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int 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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/* |
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* Given an ASN1_ITEM CHOICE type set the selector value, return old value. |
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*/ |
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int asn1_set_choice_selector(ASN1_VALUE **pval, int value, |
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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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/* |
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* Do reference counting. The value 'op' decides what to do. if it is +1 |
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* then the count is incremented. If op is 0 count is set to 1. If op is -1 |
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* count is decremented and the return value is the current refrence count or |
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* 0 if no reference count exists. |
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*/ |
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int 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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#ifdef REF_PRINT |
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fprintf(stderr, "%s: Reference Count: %d\n", it->sname, *lck); |
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#endif |
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#ifdef REF_CHECK |
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if (ret < 0) |
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fprintf(stderr, "%s, bad reference count\n", it->sname); |
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#endif |
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return ret; |
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} |
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static ASN1_ENCODING *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 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 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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if (enc->enc) |
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OPENSSL_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 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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if (enc->enc) |
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OPENSSL_free(enc->enc); |
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enc->enc = OPENSSL_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 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 **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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/* |
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* NOTE for BOOLEAN types the field is just a plain int so we can't |
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* return int **, so settle for (int *). |
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*/ |
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return pvaltmp; |
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} |
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/* |
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* Handle ANY DEFINED BY template, find the selector, look up the relevant |
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* ASN1_TEMPLATE in the table and return it. |
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*/ |
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const ASN1_TEMPLATE *asn1_do_adb(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt, |
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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 = ASN1_ADB_ptr(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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/* |
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* Convert type to a long: 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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/* |
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* Try to find matching entry in table Maybe should check application |
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* types first to allow application override? Might also be useful to |
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* have a flag which indicates table is sorted and we can do a binary |
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* search. For now stick to a 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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ASN1err(ASN1_F_ASN1_DO_ADB, ASN1_R_UNSUPPORTED_ANY_DEFINED_BY_TYPE); |
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return NULL; |
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}
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