ref: 8bc69a872883224675a55db51ac8f60ab5ed9e5a
dir: /third_party/boringssl/src/crypto/asn1/tasn_utl.c/
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* 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 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 acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS 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 AUTHOR OR 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.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.] */
#include <openssl/asn1.h>
#include <assert.h>
#include <string.h>
#include <openssl/asn1t.h>
#include <openssl/mem.h>
#include <openssl/obj.h>
#include <openssl/err.h>
#include <openssl/thread.h>
#include "../internal.h"
#include "internal.h"
/* Utility functions for manipulating fields and offsets */
/* Add 'offset' to 'addr' */
#define offset2ptr(addr, offset) (void *)(((char *)(addr)) + (offset))
/* Given an ASN1_ITEM CHOICE type return the selector value */
int asn1_get_choice_selector(ASN1_VALUE **pval, const ASN1_ITEM *it) {
int *sel = offset2ptr(*pval, it->utype);
return *sel;
}
/* Given an ASN1_ITEM CHOICE type set the selector value, return old value. */
int asn1_set_choice_selector(ASN1_VALUE **pval, int value,
const ASN1_ITEM *it) {
int *sel, ret;
sel = offset2ptr(*pval, it->utype);
ret = *sel;
*sel = value;
return ret;
}
static CRYPTO_refcount_t *asn1_get_references(ASN1_VALUE **pval,
const ASN1_ITEM *it) {
if (it->itype != ASN1_ITYPE_SEQUENCE) {
return NULL;
}
const ASN1_AUX *aux = it->funcs;
if (!aux || !(aux->flags & ASN1_AFLG_REFCOUNT)) {
return NULL;
}
return offset2ptr(*pval, aux->ref_offset);
}
void asn1_refcount_set_one(ASN1_VALUE **pval, const ASN1_ITEM *it) {
CRYPTO_refcount_t *references = asn1_get_references(pval, it);
if (references != NULL) {
*references = 1;
}
}
int asn1_refcount_dec_and_test_zero(ASN1_VALUE **pval, const ASN1_ITEM *it) {
CRYPTO_refcount_t *references = asn1_get_references(pval, it);
if (references != NULL) {
return CRYPTO_refcount_dec_and_test_zero(references);
}
return 1;
}
static ASN1_ENCODING *asn1_get_enc_ptr(ASN1_VALUE **pval, const ASN1_ITEM *it) {
assert(it->itype == ASN1_ITYPE_SEQUENCE);
const ASN1_AUX *aux;
if (!pval || !*pval) {
return NULL;
}
aux = it->funcs;
if (!aux || !(aux->flags & ASN1_AFLG_ENCODING)) {
return NULL;
}
return offset2ptr(*pval, aux->enc_offset);
}
void asn1_enc_init(ASN1_VALUE **pval, const ASN1_ITEM *it) {
ASN1_ENCODING *enc;
enc = asn1_get_enc_ptr(pval, it);
if (enc) {
enc->enc = NULL;
enc->len = 0;
enc->alias_only = 0;
enc->alias_only_on_next_parse = 0;
enc->modified = 1;
}
}
void asn1_enc_free(ASN1_VALUE **pval, const ASN1_ITEM *it) {
ASN1_ENCODING *enc;
enc = asn1_get_enc_ptr(pval, it);
if (enc) {
if (enc->enc && !enc->alias_only) {
OPENSSL_free(enc->enc);
}
enc->enc = NULL;
enc->len = 0;
enc->alias_only = 0;
enc->alias_only_on_next_parse = 0;
enc->modified = 1;
}
}
int asn1_enc_save(ASN1_VALUE **pval, const unsigned char *in, int inlen,
const ASN1_ITEM *it) {
ASN1_ENCODING *enc;
enc = asn1_get_enc_ptr(pval, it);
if (!enc) {
return 1;
}
if (!enc->alias_only) {
OPENSSL_free(enc->enc);
}
enc->alias_only = enc->alias_only_on_next_parse;
enc->alias_only_on_next_parse = 0;
if (enc->alias_only) {
enc->enc = (uint8_t *) in;
} else {
enc->enc = OPENSSL_malloc(inlen);
if (!enc->enc) {
return 0;
}
OPENSSL_memcpy(enc->enc, in, inlen);
}
enc->len = inlen;
enc->modified = 0;
return 1;
}
int asn1_enc_restore(int *len, unsigned char **out, ASN1_VALUE **pval,
const ASN1_ITEM *it) {
ASN1_ENCODING *enc;
enc = asn1_get_enc_ptr(pval, it);
if (!enc || enc->modified) {
return 0;
}
if (out) {
OPENSSL_memcpy(*out, enc->enc, enc->len);
*out += enc->len;
}
if (len) {
*len = enc->len;
}
return 1;
}
/* Given an ASN1_TEMPLATE get a pointer to a field */
ASN1_VALUE **asn1_get_field_ptr(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) {
ASN1_VALUE **pvaltmp;
if (tt->flags & ASN1_TFLG_COMBINE) {
return pval;
}
pvaltmp = offset2ptr(*pval, tt->offset);
/* NOTE for BOOLEAN types the field is just a plain int so we can't return
* int **, so settle for (int *). */
return pvaltmp;
}
/* Handle ANY DEFINED BY template, find the selector, look up the relevant
* ASN1_TEMPLATE in the table and return it. */
const ASN1_TEMPLATE *asn1_do_adb(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt,
int nullerr) {
const ASN1_ADB *adb;
const ASN1_ADB_TABLE *atbl;
long selector;
ASN1_VALUE **sfld;
int i;
if (!(tt->flags & ASN1_TFLG_ADB_MASK)) {
return tt;
}
/* Else ANY DEFINED BY ... get the table */
adb = ASN1_ADB_ptr(tt->item);
/* Get the selector field */
sfld = offset2ptr(*pval, adb->offset);
/* Check if NULL */
if (*sfld == NULL) {
if (!adb->null_tt) {
goto err;
}
return adb->null_tt;
}
/* Convert type to a long:
* NB: don't check for NID_undef here because it
* might be a legitimate value in the table */
if (tt->flags & ASN1_TFLG_ADB_OID) {
selector = OBJ_obj2nid((ASN1_OBJECT *)*sfld);
} else {
selector = ASN1_INTEGER_get((ASN1_INTEGER *)*sfld);
}
/* Try to find matching entry in table Maybe should check application types
* first to allow application override? Might also be useful to have a flag
* which indicates table is sorted and we can do a binary search. For now
* stick to a linear search. */
for (atbl = adb->tbl, i = 0; i < adb->tblcount; i++, atbl++) {
if (atbl->value == selector) {
return &atbl->tt;
}
}
/* FIXME: need to search application table too */
/* No match, return default type */
if (!adb->default_tt) {
goto err;
}
return adb->default_tt;
err:
/* FIXME: should log the value or OID of unsupported type */
if (nullerr) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_UNSUPPORTED_ANY_DEFINED_BY_TYPE);
}
return NULL;
}