1 /* tasn_utl.c */

     2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL

     3  * project 2000.

     4  */

     5 /* ====================================================================

     6  * Copyright (c) 2000-2004 The OpenSSL Project.  All rights reserved.

     7  *

     8  * Redistribution and use in source and binary forms, with or without

     9  * modification, are permitted provided that the following conditions

    10  * are met:

    11  *

    12  * 1. Redistributions of source code must retain the above copyright

    13  *    notice, this list of conditions and the following disclaimer. 

    14  *

    15  * 2. Redistributions in binary form must reproduce the above copyright

    16  *    notice, this list of conditions and the following disclaimer in

    17  *    the documentation and/or other materials provided with the

    18  *    distribution.

    19  *

    20  * 3. All advertising materials mentioning features or use of this

    21  *    software must display the following acknowledgment:

    22  *    "This product includes software developed by the OpenSSL Project

    23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"

    24  *

    25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

    26  *    endorse or promote products derived from this software without

    27  *    prior written permission. For written permission, please contact

    28  *    licensing@OpenSSL.org.

    29  *

    30  * 5. Products derived from this software may not be called "OpenSSL"

    31  *    nor may "OpenSSL" appear in their names without prior written

    32  *    permission of the OpenSSL Project.

    33  *

    34  * 6. Redistributions of any form whatsoever must retain the following

    35  *    acknowledgment:

    36  *    "This product includes software developed by the OpenSSL Project

    37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"

    38  *

    39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

    40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR

    43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

    44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

    45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

    46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

    47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

    48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

    49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

    50  * OF THE POSSIBILITY OF SUCH DAMAGE.

    51  * ====================================================================

    52  *

    53  * This product includes cryptographic software written by Eric Young

    54  * (eay@cryptsoft.com).  This product includes software written by Tim

    55  * Hudson (tjh@cryptsoft.com).

    56  *

    57  */

    58 

    59 

    60 #include <stddef.h>

    61 #include <string.h>

    62 #include <openssl/asn1.h>

    63 #include <openssl/asn1t.h>

    64 #include <openssl/objects.h>

    65 #include <openssl/err.h>

    66 

    67 /* Utility functions for manipulating fields and offsets */

    68 

    69 /* Add 'offset' to 'addr' */

    70 #define offset2ptr(addr, offset) (void *)(((char *) addr) + offset)

    71 

    72 /* Given an ASN1_ITEM CHOICE type return

    73  * the selector value

    74  */

    75 

    76 EXPORT_C int asn1_get_choice_selector(ASN1_VALUE **pval, const ASN1_ITEM *it)

    77 	{

    78 	int *sel = offset2ptr(*pval, it->utype);

    79 	return *sel;

    80 	}

    81 

    82 /* Given an ASN1_ITEM CHOICE type set

    83  * the selector value, return old value.

    84  */

    85 

    86 EXPORT_C int asn1_set_choice_selector(ASN1_VALUE **pval, int value, const ASN1_ITEM *it)

    87 	{	

    88 	int *sel, ret;

    89 	sel = offset2ptr(*pval, it->utype);

    90 	ret = *sel;

    91 	*sel = value;

    92 	return ret;

    93 	}

    94 

    95 /* Do reference counting. The value 'op' decides what to do. 

    96  * if it is +1 then the count is incremented. If op is 0 count is

    97  * set to 1. If op is -1 count is decremented and the return value

    98  * is the current refrence count or 0 if no reference count exists.

    99  */

   100 

   101 EXPORT_C int asn1_do_lock(ASN1_VALUE **pval, int op, const ASN1_ITEM *it)

   102 	{

   103 	const ASN1_AUX *aux;

   104 	int *lck, ret;

   105 	if ((it->itype != ASN1_ITYPE_SEQUENCE)

   106 	   && (it->itype != ASN1_ITYPE_NDEF_SEQUENCE))

   107 		return 0;

   108 	aux = it->funcs;

   109 	if (!aux || !(aux->flags & ASN1_AFLG_REFCOUNT))

   110 		return 0;

   111 	lck = offset2ptr(*pval, aux->ref_offset);

   112 	if (op == 0)

   113 		{

   114 		*lck = 1;

   115 		return 1;

   116 		}

   117 	ret = CRYPTO_add(lck, op, aux->ref_lock);

   118 #ifdef REF_PRINT

   119 	fprintf(stderr, "%s: Reference Count: %d\n", it->sname, *lck);

   120 #endif

   121 #ifdef REF_CHECK

   122 	if (ret < 0) 

   123 		fprintf(stderr, "%s, bad reference count\n", it->sname);

   124 #endif

   125 	return ret;

   126 	}

   127 

   128 static ASN1_ENCODING *asn1_get_enc_ptr(ASN1_VALUE **pval, const ASN1_ITEM *it)

   129 	{

   130 	const ASN1_AUX *aux;

   131 	if (!pval || !*pval)

   132 		return NULL;

   133 	aux = it->funcs;

   134 	if (!aux || !(aux->flags & ASN1_AFLG_ENCODING))

   135 		return NULL;

   136 	return offset2ptr(*pval, aux->enc_offset);

   137 	}

   138 

   139 EXPORT_C void asn1_enc_init(ASN1_VALUE **pval, const ASN1_ITEM *it)

   140 	{

   141 	ASN1_ENCODING *enc;

   142 	enc = asn1_get_enc_ptr(pval, it);

   143 	if (enc)

   144 		{

   145 		enc->enc = NULL;

   146 		enc->len = 0;

   147 		enc->modified = 1;

   148 		}

   149 	}

   150 

   151 EXPORT_C void asn1_enc_free(ASN1_VALUE **pval, const ASN1_ITEM *it)

   152 	{

   153 	ASN1_ENCODING *enc;

   154 	enc = asn1_get_enc_ptr(pval, it);

   155 	if (enc)

   156 		{

   157 		if (enc->enc)

   158 			OPENSSL_free(enc->enc);

   159 		enc->enc = NULL;

   160 		enc->len = 0;

   161 		enc->modified = 1;

   162 		}

   163 	}

   164 

   165 EXPORT_C int asn1_enc_save(ASN1_VALUE **pval, const unsigned char *in, int inlen,

   166 							 const ASN1_ITEM *it)

   167 	{

   168 	ASN1_ENCODING *enc;

   169 	enc = asn1_get_enc_ptr(pval, it);

   170 	if (!enc)

   171 		return 1;

   172 

   173 	if (enc->enc)

   174 		OPENSSL_free(enc->enc);

   175 	enc->enc = OPENSSL_malloc(inlen);

   176 	if (!enc->enc)

   177 		return 0;

   178 	memcpy(enc->enc, in, inlen);

   179 	enc->len = inlen;

   180 	enc->modified = 0;

   181 

   182 	return 1;

   183 	}

   184 		

   185 EXPORT_C int asn1_enc_restore(int *len, unsigned char **out, ASN1_VALUE **pval,

   186 							const ASN1_ITEM *it)

   187 	{

   188 	ASN1_ENCODING *enc;

   189 	enc = asn1_get_enc_ptr(pval, it);

   190 	if (!enc || enc->modified)

   191 		return 0;

   192 	if (out)

   193 		{

   194 		memcpy(*out, enc->enc, enc->len);

   195 		*out += enc->len;

   196 		}

   197 	if (len)

   198 		*len = enc->len;

   199 	return 1;

   200 	}

   201 

   202 /* Given an ASN1_TEMPLATE get a pointer to a field */

   203 EXPORT_C ASN1_VALUE ** asn1_get_field_ptr(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)

   204 	{

   205 	ASN1_VALUE **pvaltmp;

   206 	if (tt->flags & ASN1_TFLG_COMBINE)

   207 		return pval;

   208 	pvaltmp = offset2ptr(*pval, tt->offset);

   209 	/* NOTE for BOOLEAN types the field is just a plain

   210  	 * int so we can't return int **, so settle for

   211 	 * (int *).

   212 	 */

   213 	return pvaltmp;

   214 	}

   215 

   216 /* Handle ANY DEFINED BY template, find the selector, look up

   217  * the relevant ASN1_TEMPLATE in the table and return it.

   218  */

   219 

   220 EXPORT_C const ASN1_TEMPLATE *asn1_do_adb(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt,

   221 								int nullerr)

   222 	{

   223 	const ASN1_ADB *adb;

   224 	const ASN1_ADB_TABLE *atbl;

   225 	long selector;

   226 	ASN1_VALUE **sfld;

   227 	int i;

   228 	if (!(tt->flags & ASN1_TFLG_ADB_MASK))

   229 		return tt;

   230 

   231 	/* Else ANY DEFINED BY ... get the table */

   232 	adb = ASN1_ADB_ptr(tt->item);

   233 

   234 	/* Get the selector field */

   235 	sfld = offset2ptr(*pval, adb->offset);

   236 

   237 	/* Check if NULL */

   238 	if (!sfld)

   239 		{

   240 		if (!adb->null_tt)

   241 			goto err;

   242 		return adb->null_tt;

   243 		}

   244 

   245 	/* Convert type to a long:

   246 	 * NB: don't check for NID_undef here because it

   247 	 * might be a legitimate value in the table

   248 	 */

   249 	if (tt->flags & ASN1_TFLG_ADB_OID) 

   250 		selector = OBJ_obj2nid((ASN1_OBJECT *)*sfld);

   251 	else 

   252 		selector = ASN1_INTEGER_get((ASN1_INTEGER *)*sfld);

   253 

   254 	/* Try to find matching entry in table

   255 	 * Maybe should check application types first to

   256 	 * allow application override? Might also be useful

   257 	 * to have a flag which indicates table is sorted and

   258 	 * we can do a binary search. For now stick to a

   259 	 * linear search.

   260 	 */

   261 

   262 	for (atbl = adb->tbl, i = 0; i < adb->tblcount; i++, atbl++)

   263 		if (atbl->value == selector)

   264 			return &atbl->tt;

   265 

   266 	/* FIXME: need to search application table too */

   267 

   268 	/* No match, return default type */

   269 	if (!adb->default_tt)

   270 		goto err;		

   271 	return adb->default_tt;

   272 	

   273 	err:

   274 	/* FIXME: should log the value or OID of unsupported type */

   275 	if (nullerr)

   276 		ASN1err(ASN1_F_ASN1_DO_ADB,

   277 			ASN1_R_UNSUPPORTED_ANY_DEFINED_BY_TYPE);

   278 	return NULL;

   279 	}