crypto/openssl-0.9.7d/crypto/asn1/tasn_utl.c

   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 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 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 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 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) return 0;
 106         aux = it->funcs;
 107         if(!aux || !(aux->flags & ASN1_AFLG_REFCOUNT)) return 0;
 108         lck = offset2ptr(*pval, aux->ref_offset);
 109         if(op == 0) {
 110                 *lck = 1;
 111                 return 1;
 112         }
 113         ret = CRYPTO_add(lck, op, aux->ref_lock);
 114 #ifdef REF_PRINT
 115         fprintf(stderr, "%s: Reference Count: %d\n", it->sname, *lck);
 116 #endif
 117 #ifdef REF_CHECK
 118         if(ret < 0)
 119                 fprintf(stderr, "%s, bad reference count\n", it->sname);
 120 #endif
 121         return ret;
 122 }
 123
 124 static ASN1_ENCODING *asn1_get_enc_ptr(ASN1_VALUE **pval, const ASN1_ITEM *it)
 125 {
 126         const ASN1_AUX *aux;
 127         if(!pval || !*pval) return NULL;
 128         aux = it->funcs;
 129         if(!aux || !(aux->flags & ASN1_AFLG_ENCODING)) return NULL;
 130         return offset2ptr(*pval, aux->enc_offset);
 131 }
 132
 133 void asn1_enc_init(ASN1_VALUE **pval, const ASN1_ITEM *it)
 134 {
 135         ASN1_ENCODING *enc;
 136         enc = asn1_get_enc_ptr(pval, it);
 137         if(enc) {
 138                 enc->enc = NULL;
 139                 enc->len = 0;
 140                 enc->modified = 1;
 141         }
 142 }
 143
 144 void asn1_enc_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
 145 {
 146         ASN1_ENCODING *enc;
 147         enc = asn1_get_enc_ptr(pval, it);
 148         if(enc) {
 149                 if(enc->enc) OPENSSL_free(enc->enc);
 150                 enc->enc = NULL;
 151                 enc->len = 0;
 152                 enc->modified = 1;
 153         }
 154 }
 155
 156 int asn1_enc_save(ASN1_VALUE **pval, unsigned char *in, int inlen, const ASN1_ITEM *it)
 157 {
 158         ASN1_ENCODING *enc;
 159         enc = asn1_get_enc_ptr(pval, it);
 160         if(!enc) return 1;
 161
 162         if(enc->enc) OPENSSL_free(enc->enc);
 163         enc->enc = OPENSSL_malloc(inlen);
 164         if(!enc->enc) return 0;
 165         memcpy(enc->enc, in, inlen);
 166         enc->len = inlen;
 167         enc->modified = 0;
 168
 169         return 1;
 170 }
 171
 172 int asn1_enc_restore(int *len, unsigned char **out, ASN1_VALUE **pval, const ASN1_ITEM *it)
 173 {
 174         ASN1_ENCODING *enc;
 175         enc = asn1_get_enc_ptr(pval, it);
 176         if(!enc || enc->modified) return 0;
 177         if(out) {
 178                 memcpy(*out, enc->enc, enc->len);
 179                 *out += enc->len;
 180         }
 181         if(len) *len = enc->len;
 182         return 1;
 183 }
 184
 185 /* Given an ASN1_TEMPLATE get a pointer to a field */
 186 ASN1_VALUE ** asn1_get_field_ptr(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
 187 {
 188         ASN1_VALUE **pvaltmp;
 189         if(tt->flags & ASN1_TFLG_COMBINE) return pval;
 190         pvaltmp = offset2ptr(*pval, tt->offset);
 191         /* NOTE for BOOLEAN types the field is just a plain
 192          * int so we can't return int **, so settle for
 193          * (int *).
 194          */
 195         return pvaltmp;
 196 }
 197
 198 /* Handle ANY DEFINED BY template, find the selector, look up
 199  * the relevant ASN1_TEMPLATE in the table and return it.
 200  */
 201
 202 const ASN1_TEMPLATE *asn1_do_adb(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt, int nullerr)
 203 {
 204         const ASN1_ADB *adb;
 205         const ASN1_ADB_TABLE *atbl;
 206         long selector;
 207         ASN1_VALUE **sfld;
 208         int i;
 209         if(!(tt->flags & ASN1_TFLG_ADB_MASK)) return tt;
 210
 211         /* Else ANY DEFINED BY ... get the table */
 212         adb = ASN1_ADB_ptr(tt->item);
 213
 214         /* Get the selector field */
 215         sfld = offset2ptr(*pval, adb->offset);
 216
 217         /* Check if NULL */
 218         if(!sfld) {
 219                 if(!adb->null_tt) goto err;
 220                 return adb->null_tt;
 221         }
 222
 223         /* Convert type to a long:
 224          * NB: don't check for NID_undef here because it
 225          * might be a legitimate value in the table
 226          */
 227         if(tt->flags & ASN1_TFLG_ADB_OID)
 228                 selector = OBJ_obj2nid((ASN1_OBJECT *)*sfld);
 229         else
 230                 selector = ASN1_INTEGER_get((ASN1_INTEGER *)*sfld);
 231
 232         /* Try to find matching entry in table
 233          * Maybe should check application types first to
 234          * allow application override? Might also be useful
 235          * to have a flag which indicates table is sorted and
 236          * we can do a binary search. For now stick to a
 237          * linear search.
 238          */
 239
 240         for(atbl = adb->tbl, i = 0; i < adb->tblcount; i++, atbl++)
 241                 if(atbl->value == selector) return &atbl->tt;
 242
 243         /* FIXME: need to search application table too */
 244
 245         /* No match, return default type */
 246         if(!adb->default_tt) goto err;
 247         return adb->default_tt;
 248
 249         err:
 250         /* FIXME: should log the value or OID of unsupported type */
 251         if(nullerr) ASN1err(ASN1_F_ASN1_DO_ADB, ASN1_R_UNSUPPORTED_ANY_DEFINED_BY_TYPE);
 252         return NULL;
 253 }