1/* tasn_utl.c */ 2/* Written by Dr Stephen N Henson (steve@openssl.org) 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 63#if 0 64#include "cs-asn1.h" 65#include "cs-asn1t.h" 66#include "cs-objects.h" 67#include "cs-err.h" 68 69#else 70#include <openssl/asn1.h> 71#include <openssl/asn1t.h> 72#include <openssl/objects.h> 73#include <openssl/err.h> 74#endif 75 76/* Utility functions for manipulating fields and offsets */ 77 78/* Add 'offset' to 'addr' */ 79#define offset2ptr(addr, offset) (void *)(((char *) addr) + offset) 80 81/* Given an ASN1_ITEM CHOICE type return 82 * the selector value 83 */ 84 85int asn1_get_choice_selector(ASN1_VALUE **pval, const ASN1_ITEM *it) 86 { 87 int *sel = offset2ptr(*pval, it->utype); 88 return *sel; 89 } 90 91/* Given an ASN1_ITEM CHOICE type set 92 * the selector value, return old value. 93 */ 94 95int asn1_set_choice_selector(ASN1_VALUE **pval, int value, const ASN1_ITEM *it) 96 { 97 int *sel, ret; 98 sel = offset2ptr(*pval, it->utype); 99 ret = *sel; 100 *sel = value; 101 return ret; 102 } 103 104/* Do reference counting. The value 'op' decides what to do. 105 * if it is +1 then the count is incremented. If op is 0 count is 106 * set to 1. If op is -1 count is decremented and the return value 107 * is the current refrence count or 0 if no reference count exists. 108 */ 109 110int asn1_do_lock(ASN1_VALUE **pval, int op, const ASN1_ITEM *it) 111 { 112 const ASN1_AUX *aux; 113 int *lck, ret; 114 if ((it->itype != ASN1_ITYPE_SEQUENCE) 115 && (it->itype != ASN1_ITYPE_NDEF_SEQUENCE)) 116 return 0; 117 aux = it->funcs; 118 if (!aux || !(aux->flags & ASN1_AFLG_REFCOUNT)) 119 return 0; 120 lck = offset2ptr(*pval, aux->ref_offset); 121 if (op == 0) 122 { 123 *lck = 1; 124 return 1; 125 } 126 /* XXX ret = CRYPTO_add(lck, op, aux->ref_lock); */ 127 ret = *lck += op; 128#ifdef REF_PRINT 129 fprintf(stderr, "%s: Reference Count: %d\n", it->sname, *lck); 130#endif 131#ifdef REF_CHECK 132 if (ret < 0) 133 fprintf(stderr, "%s, bad reference count\n", it->sname); 134#endif 135 return ret; 136 } 137 138static ASN1_ENCODING *asn1_get_enc_ptr(ASN1_VALUE **pval, const ASN1_ITEM *it) 139 { 140 const ASN1_AUX *aux; 141 if (!pval || !*pval) 142 return NULL; 143 aux = it->funcs; 144 if (!aux || !(aux->flags & ASN1_AFLG_ENCODING)) 145 return NULL; 146 return offset2ptr(*pval, aux->enc_offset); 147 } 148 149void asn1_enc_init(ASN1_VALUE **pval, const ASN1_ITEM *it) 150 { 151 ASN1_ENCODING *enc; 152 enc = asn1_get_enc_ptr(pval, it); 153 if (enc) 154 { 155 enc->enc = NULL; 156 enc->len = 0; 157 enc->modified = 1; 158 } 159 } 160 161void asn1_enc_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 162 { 163 ASN1_ENCODING *enc; 164 enc = asn1_get_enc_ptr(pval, it); 165 if (enc) 166 { 167 if (enc->enc) 168 free(enc->enc); 169 enc->enc = NULL; 170 enc->len = 0; 171 enc->modified = 1; 172 } 173 } 174 175int asn1_enc_save(ASN1_VALUE **pval, const unsigned char *in, int inlen, 176 const ASN1_ITEM *it) 177 { 178 ASN1_ENCODING *enc; 179 enc = asn1_get_enc_ptr(pval, it); 180 if (!enc) 181 return 1; 182 183 if (enc->enc) 184 free(enc->enc); 185 enc->enc = malloc(inlen); 186 if (!enc->enc) 187 return 0; 188 memcpy(enc->enc, in, inlen); 189 enc->len = inlen; 190 enc->modified = 0; 191 192 return 1; 193 } 194 195int asn1_enc_restore(int *len, unsigned char **out, ASN1_VALUE **pval, 196 const ASN1_ITEM *it) 197 { 198 ASN1_ENCODING *enc; 199 enc = asn1_get_enc_ptr(pval, it); 200 if (!enc || enc->modified) 201 return 0; 202 if (out) 203 { 204 memcpy(*out, enc->enc, enc->len); 205 *out += enc->len; 206 } 207 if (len) 208 *len = enc->len; 209 return 1; 210 } 211 212/* Given an ASN1_TEMPLATE get a pointer to a field */ 213ASN1_VALUE ** asn1_get_field_ptr(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) 214 { 215 ASN1_VALUE **pvaltmp; 216 if (tt->flags & ASN1_TFLG_COMBINE) 217 return pval; 218 pvaltmp = offset2ptr(*pval, tt->offset); 219 /* NOTE for BOOLEAN types the field is just a plain 220 * int so we can't return int **, so settle for 221 * (int *). 222 */ 223 return pvaltmp; 224 } 225 226/* Handle ANY DEFINED BY template, find the selector, look up 227 * the relevant ASN1_TEMPLATE in the table and return it. 228 */ 229 230const ASN1_TEMPLATE *asn1_do_adb(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt, 231 int nullerr) 232 { 233 const ASN1_ADB *adb; 234 const ASN1_ADB_TABLE *atbl; 235 long selector; 236 ASN1_VALUE **sfld; 237 int i; 238 if (!(tt->flags & ASN1_TFLG_ADB_MASK)) 239 return tt; 240 241 /* Else ANY DEFINED BY ... get the table */ 242 adb = ASN1_ADB_ptr(tt->item); 243 244 /* Get the selector field */ 245 sfld = offset2ptr(*pval, adb->offset); 246 247 /* Check if NULL */ 248 if (!sfld) 249 { 250 if (!adb->null_tt) 251 goto err; 252 return adb->null_tt; 253 } 254 255 /* Convert type to a long: 256 * NB: don't check for NID_undef here because it 257 * might be a legitimate value in the table 258 */ 259 if (tt->flags & ASN1_TFLG_ADB_OID) 260 selector = OBJ_obj2nid((ASN1_OBJECT *)*sfld); 261 else 262 selector = ASN1_INTEGER_get((ASN1_INTEGER *)*sfld); 263 264 /* Try to find matching entry in table 265 * Maybe should check application types first to 266 * allow application override? Might also be useful 267 * to have a flag which indicates table is sorted and 268 * we can do a binary search. For now stick to a 269 * linear search. 270 */ 271 272 for (atbl = adb->tbl, i = 0; i < adb->tblcount; i++, atbl++) 273 if (atbl->value == selector) 274 return &atbl->tt; 275 276 /* FIXME: need to search application table too */ 277 278 /* No match, return default type */ 279 if (!adb->default_tt) 280 goto err; 281 return adb->default_tt; 282 283 err: 284 /* FIXME: should log the value or OID of unsupported type */ 285 if (nullerr) 286 /* ASN1err(ASN1_F_ASN1_DO_ADB, 287 ASN1_R_UNSUPPORTED_ANY_DEFINED_BY_TYPE); */ 288 return NULL; 289 } 290